DisplayOpenCV¶

class DisplayOpenCV(*args, **kwargs)¶

Bases: Display

The vpDisplayOpenCV allows to display image using the OpenCV library. Thus to enable this class OpenCV should be installed. Installation instructions are provided here https://visp.inria.fr/3rd_opencv .

Warning

Since ViSP 3.3.1 or higher we introduce the alpha channel support for color transparency. This new feature is only supported yet using vpDisplayOpenCV . See vpColor header documentation and displayOpenCV.cpp example for usage displaying filled transparent circles and rectangles.

The example below shows how to display an image with this video device.

#include <visp3/core/vpImagePoint.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/io/vpImageIo.h>

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

int main()
{
#if defined(VISP_HAVE_OPENCV)
  vpImage<unsigned char> I; // Grey level image

  // Read an image in PGM P5 format
  vpImageIo::read(I, "/local/soft/ViSP/ViSP-images/Klimt/Klimt.pgm");

  vpDisplayOpenCV d;

  // Initialize the display with the image I. Display and image are
  // now link together.
  d.init(I);

  // Specify the window location
  vpDisplay::setWindowPosition(I, 400, 100);

  // Set the display window title
  vpDisplay::setTitle(I, "My OpenCV display");

  // Set the display background with image I content
  vpDisplay::display(I);

  // Draw a red rectangle in the display overlay (foreground)
  vpDisplay::displayRectangle(I, 10, 10, 100, 20, vpColor::red, true);

  // Draw a red rectangle in the display overlay (foreground)
  vpImagePoint topLeftCorner;
  topLeftCorner.set_i(10);
  topLeftCorner.set_j(50);
  vpDisplay::displayRectangle(I, topLeftCorner, 100, 20, vpColor::green, true);

  // Flush the foreground and background display
  vpDisplay::flush(I);

  // Get non blocking keyboard events
  std::cout << "Check keyboard events..." << std::endl;
  char key[10];
  bool ret;
  for (int i=0; i< 200; ++i) {
    bool ret = vpDisplay::getKeyboardEvent(I, key, false);
    if (ret)
      std::cout << "keyboard event: key: " << "\"" << key << "\"" << std::endl;
  vpTime::wait(40);
  }

  // Get a blocking keyboard event
  std::cout << "Wait for a keyboard event..." << std::endl;
  ret = vpDisplay::getKeyboardEvent(I, key, true);
  std::cout << "keyboard event: " << ret << std::endl;
  if (ret)
    std::cout << "key: " << "\"" << key << "\"" << std::endl;

  // Wait for a click in the display window
  std::cout << "Wait for a button click..." << std::endl;
  vpDisplay::getClick(I);
#endif
}

Overloaded function.

__init__(self: visp._visp.gui.DisplayOpenCV) -> None

Basic constructor.

To initialize the window position, title and size you may call init(vpImage<unsigned char> &, int, int, const std::string &) or init(vpImage<vpRGBa> &, int, int, const std::string &) .

#include <visp3/core/vpImage.h>
#include <visp3/gui/vpDisplayOpenCV.h>

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

int main()
{
  vpDisplayOpenCV d;
  vpImage<unsigned char> I(240, 384);
  d.init(I, 100, 200, "My display");
}

__init__(self: visp._visp.gui.DisplayOpenCV, winx: int, winy: int, title: str = ) -> None

Constructor that just initialize the display position in the screen and the display title.

To initialize the display size, you need to call init() .

#include <visp3/core/vpImage.h>
#include <visp3/gui/vpDisplayOpenCV.h>

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

int main()
{
  vpDisplayOpenCV d(100, 200, "My display");
  vpImage<unsigned char> I(240, 384);
  d.init(I);
}

Parameters:

title: Window title.

__init__(self: visp._visp.gui.DisplayOpenCV, I: visp._visp.core.ImageGray, type: visp._visp.core.Display.ScaleType) -> None

Constructor. Initialize a display to visualize a gray level image (8 bits).

Parameters:

I: Image to be displayed (not that image has to be initialized)

__init__(self: visp._visp.gui.DisplayOpenCV, I: visp._visp.core.ImageGray, winx: int = -1, winy: int = -1, title: str = , type: visp._visp.core.Display.ScaleType) -> None

Constructor. Initialize a display to visualize a gray level image (8 bits).

Parameters:

I: Image to be displayed (not that image has to be initialized)
title: Window title.

__init__(self: visp._visp.gui.DisplayOpenCV, I: visp._visp.core.ImageRGBa, type: visp._visp.core.Display.ScaleType) -> None

Constructor. Initialize a display to visualize a RGBa image (32 bits).

Parameters:

I: Image to be displayed (not that image has to be initialized)

__init__(self: visp._visp.gui.DisplayOpenCV, I: visp._visp.core.ImageRGBa, winx: int = -1, winy: int = -1, title: str = , type: visp._visp.core.Display.ScaleType) -> None

Constructor. Initialize a display to visualize a RGBa image (32 bits).

Parameters:

I: Image to be displayed (not that image has to be initialized)
title: Window title.

Methods

`__init__`	Overloaded function.
`getImage`	Get the window pixmap and put it in vpRGBa image.
`getScreenHeight`	Gets the screen vertical resolution in pixels.
`getScreenSize`	Gets screen resolution in pixels.
`getScreenWidth`	Gets the screen horizontal resolution in pixels.
`init`	Overloaded function.

Inherited Methods

`flush`	Overloaded function.
`getWindowYPosition`	Return the position (along the vertical axis) on the screen of the display window.
`getPointerMotionEvent`	Overloaded function.
`displayFrame`	Overloaded function.
`SCALE_5`
`setFont`	Overloaded function.
`display`	Overloaded function.
`displayCamera`	Overloaded function.
`SCALE_6`
`SCALE_7`
`SCALE_1`
`SCALE_8`
`SCALE_AUTO`
`getClickUp`	Overloaded function.
`getKeyboardEvent`	Overloaded function.
`displayEllipse`	Overloaded function.
`close`	Overloaded function.
`setBackground`	Overloaded function.
`setTitle`	Overloaded function.
`displayPoint`	Overloaded function.
`SCALE_3`
`computeAutoScale`	param width: Image size.
`displayCircleStatic`	Overloaded function.
`getPointerPosition`	Overloaded function.
`getWindowXPosition`	Return the position (along the horizontal axis) on the screen of the display window.
`displayDotLine`	Overloaded function.
`getWidth`	Return the display width.
`SCALE_2`
`displayPolygon`	Overloaded function.
`SCALE_DEFAULT`
`isInitialised`	Check if the display has been initialised.
`SCALE_10`
`setWindowPosition`	Overloaded function.
`SCALE_4`
`setDownScalingFactor`	Overloaded function.
`displayCross`	Overloaded function.
`displayText`	Overloaded function.
`getHeight`	Return the display height.
`getDownScalingFactor`	Return the value of the down scale factor applied to the image in order to reduce the size of the window used to display the image.
`displayLine`	Overloaded function.
`getClick`	Overloaded function.
`displayRectangle`	Overloaded function.
`getImageDownScalingFactor`	Overloaded function.
`displayArrow`	Overloaded function.
`displayROI`	Overloaded function.
`SCALE_9`
`flushROI`	Overloaded function.
`ScaleType`	Values that could be applied to a display to down scale the size of the display.

Operators

`__doc__`
`__init__`	Overloaded function.
`__module__`

Attributes

`SCALE_1`
`SCALE_10`
`SCALE_2`
`SCALE_3`
`SCALE_4`
`SCALE_5`
`SCALE_6`
`SCALE_7`
`SCALE_8`
`SCALE_9`
`SCALE_AUTO`
`SCALE_DEFAULT`
`__annotations__`

class ScaleType(self, value: int)¶

Bases: pybind11_object

Values that could be applied to a display to down scale the size of the display.

Values:

SCALE_AUTO: Auto down scaling factor computed fom the screen resolution.
SCALE_1: Display and image have the same size.
SCALE_2: Display width and height is down scaled by 2 wrt the image size.
SCALE_3: Display width and height is down scaled by 3 wrt the image size.
SCALE_4: Display width and height is down scaled by 4 wrt the image size.
SCALE_5: Display width and height is down scaled by 5 wrt the image size.
SCALE_6: Display width and height is down scaled by 6 wrt the image size.
SCALE_7: Display width and height is down scaled by 7 wrt the image size.
SCALE_8: Display width and height is down scaled by 8 wrt the image size.
SCALE_9: Display width and height is down scaled by 9 wrt the image size.
SCALE_10: Display width and height is down scaled by 10 wrt the image size.
SCALE_DEFAULT: Display and image have the same size. Similar to vpDisplay::SCALE_1 .

__and__(self, other: object) → object¶

__eq__(self, other: object) → bool¶

__ge__(self, other: object) → bool¶

__getstate__(self) → int¶

__gt__(self, other: object) → bool¶

__hash__(self) → int¶

__index__(self) → int¶

__init__(self, value: int)¶

__int__(self) → int¶

__invert__(self) → object¶

__le__(self, other: object) → bool¶

__lt__(self, other: object) → bool¶

__ne__(self, other: object) → bool¶

__or__(self, other: object) → object¶

__rand__(self, other: object) → object¶

__ror__(self, other: object) → object¶

__rxor__(self, other: object) → object¶

__setstate__(self, state: int) → None¶

__xor__(self, other: object) → object¶

property name : str¶

__init__(*args, **kwargs)¶

Overloaded function.

__init__(self: visp._visp.gui.DisplayOpenCV) -> None

Basic constructor.

To initialize the window position, title and size you may call init(vpImage<unsigned char> &, int, int, const std::string &) or init(vpImage<vpRGBa> &, int, int, const std::string &) .

#include <visp3/core/vpImage.h>
#include <visp3/gui/vpDisplayOpenCV.h>

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

int main()
{
  vpDisplayOpenCV d;
  vpImage<unsigned char> I(240, 384);
  d.init(I, 100, 200, "My display");
}

__init__(self: visp._visp.gui.DisplayOpenCV, winx: int, winy: int, title: str = ) -> None

Constructor that just initialize the display position in the screen and the display title.

To initialize the display size, you need to call init() .

#include <visp3/core/vpImage.h>
#include <visp3/gui/vpDisplayOpenCV.h>

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

int main()
{
  vpDisplayOpenCV d(100, 200, "My display");
  vpImage<unsigned char> I(240, 384);
  d.init(I);
}

Parameters:

title: Window title.

__init__(self: visp._visp.gui.DisplayOpenCV, I: visp._visp.core.ImageGray, type: visp._visp.core.Display.ScaleType) -> None

Constructor. Initialize a display to visualize a gray level image (8 bits).

Parameters:

I: Image to be displayed (not that image has to be initialized)

__init__(self: visp._visp.gui.DisplayOpenCV, I: visp._visp.core.ImageGray, winx: int = -1, winy: int = -1, title: str = , type: visp._visp.core.Display.ScaleType) -> None

Constructor. Initialize a display to visualize a gray level image (8 bits).

Parameters:

I: Image to be displayed (not that image has to be initialized)
title: Window title.

__init__(self: visp._visp.gui.DisplayOpenCV, I: visp._visp.core.ImageRGBa, type: visp._visp.core.Display.ScaleType) -> None

Constructor. Initialize a display to visualize a RGBa image (32 bits).

Parameters:

I: Image to be displayed (not that image has to be initialized)

__init__(self: visp._visp.gui.DisplayOpenCV, I: visp._visp.core.ImageRGBa, winx: int = -1, winy: int = -1, title: str = , type: visp._visp.core.Display.ScaleType) -> None

Constructor. Initialize a display to visualize a RGBa image (32 bits).

Parameters:

I: Image to be displayed (not that image has to be initialized)
title: Window title.

static close(*args, **kwargs)¶

Overloaded function.

close(I: visp._visp.core.ImageGray) -> None

Close the display attached to I.

close(I: visp._visp.core.ImageRGBa) -> None

Close the display attached to I.

computeAutoScale(self, width: int, height: int) → int¶

Parameters:

width: int¶: Image size.
height: int¶: Image size.

static display(*args, **kwargs)¶

Overloaded function.

display(I: visp._visp.core.ImageGray) -> None

Display image I .

Warning

Display has to be initialized.

Warning

Suppress the overlay drawing.

Note

See init() , close()

Parameters:

I: Image to display.

display(I: visp._visp.core.ImageRGBa) -> None

Display image I .

Warning

Display has to be initialized.

Warning

Suppress the overlay drawing.

Note

See init() , close()

Parameters:

I: Image to display.

static displayArrow(*args, **kwargs)¶

Overloaded function.

displayArrow(I: visp._visp.core.ImageGray, ip1: visp._visp.core.ImagePoint, ip2: visp._visp.core.ImagePoint, color: visp._visp.core.Color = vpColor::white, w: int = 4, h: int = 2, thickness: int = 1) -> None

Display an arrow from image point ip1 to image point ip2 .

Parameters:

I: The image associated to the display.
ip1: Initial and final image points.
ip2: Initial and final image points.
color: Arrow color.
w: Width and height of the arrow.
h: Width and height of the arrow.
thickness: Thickness of the lines used to display the arrow.

displayArrow(I: visp._visp.core.ImageGray, i1: int, j1: int, i2: int, j2: int, color: visp._visp.core.Color = vpColor::white, w: int = 4, h: int = 2, thickness: int = 1) -> None

Display an arrow from image point (i1,j1) to image point (i2,j2).

Parameters:

I: The image associated to the display.
i1: Initial image point.
j1: Initial image point.
i2: Final image point.
j2: Final image point.
color: Arrow color.
w: Width and height of the arrow.
h: Width and height of the arrow.
thickness: Thickness of the lines used to display the arrow.

displayArrow(I: visp._visp.core.ImageRGBa, ip1: visp._visp.core.ImagePoint, ip2: visp._visp.core.ImagePoint, color: visp._visp.core.Color = vpColor::white, w: int = 4, h: int = 2, thickness: int = 1) -> None

Display an arrow from image point ip1 to image point ip2 .

Parameters:

I: The image associated to the display.
ip1: Initial and final image points.
ip2: Initial and final image points.
color: Arrow color.
w: Width and height of the arrow.
h: Width and height of the arrow.
thickness: Thickness of the lines used to display the arrow.

displayArrow(I: visp._visp.core.ImageRGBa, i1: int, j1: int, i2: int, j2: int, color: visp._visp.core.Color = vpColor::white, w: int = 4, h: int = 2, thickness: int = 1) -> None

Display an arrow from image point (i1,j1) to image point (i2,j2).

Parameters:

I: The image associated to the display.
i1: Initial image point.
j1: Initial image point.
i2: Final image point.
j2: Final image point.
color: Arrow color.
w: Width and height of the arrow.
h: Width and height of the arrow.
thickness: Thickness of the lines used to display the arrow.

static displayCamera(*args, **kwargs)¶

Overloaded function.

displayCamera(I: visp._visp.core.ImageGray, cMo: visp._visp.core.HomogeneousMatrix, cam: visp._visp.core.CameraParameters, size: float, color: visp._visp.core.Color, thickness: int) -> None

Display the projection of an object camera represented by a cone in the image.

Parameters:

I: The image associated to the display.
cMo: Homogeneous matrix that gives the transformation between the camera frame and the object frame to project in the image.
cam: Camera intrinsic parameters.
size: Size of the object camera.
color: Color used to display the camera in the image.
thickness: Thickness of the graphics drawing.

displayCamera(I: visp._visp.core.ImageRGBa, cMo: visp._visp.core.HomogeneousMatrix, cam: visp._visp.core.CameraParameters, size: float, color: visp._visp.core.Color, thickness: int) -> None

Display the projection of an object camera represented by a cone in the image.

Parameters:

I: The image associated to the display.
cMo: Homogeneous matrix that gives the transformation between the camera frame and the object frame to project in the image.
cam: Camera intrinsic parameters.
size: Size of the object camera.
color: Color used to display the camera in the image.
thickness: Thickness of the graphics drawing.

static displayCircleStatic(*args, **kwargs)¶

Overloaded function.

displayCircleStatic(I: visp._visp.core.ImageGray, circle: visp._visp.core.ImageCircle, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a circle.

Parameters:

I: The image associated to the display.
circle: Circle to display.
color: Circle color.
fill: When set to true fill the circle. When vpDisplayOpenCV is used, and color alpha channel is set, filling feature can handle transparency. See vpColor header class documentation.
thickness: Thickness of the circle. This parameter is only useful when fill is set to false.

displayCircleStatic(I: visp._visp.core.ImageGray, center: visp._visp.core.ImagePoint, radius: int, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a circle.

Parameters:

I: The image associated to the display.
center: Circle center position.
radius: Circle radius.
color: Circle color.
fill: When set to true fill the circle. When vpDisplayOpenCV is used, and color alpha channel is set, filling feature can handle transparency. See vpColor header class documentation.
thickness: Thickness of the circle. This parameter is only useful when fill is set to false.

displayCircleStatic(I: visp._visp.core.ImageGray, i: int, j: int, radius: int, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a circle.

Parameters:

I: The image associated to the display.
i: Circle center position.
j: Circle center position.
radius: Circle radius.
color: Circle color.
fill: When set to true fill the circle. When vpDisplayOpenCV is used, and color alpha channel is set, filling feature can handle transparency. See vpColor header class documentation.
thickness: Thickness of the circle. This parameter is only useful when fill is set to false.

displayCircleStatic(I: visp._visp.core.ImageRGBa, circle: visp._visp.core.ImageCircle, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a circle.

Parameters:

I: The image associated to the display.
circle: Circle to display.
color: Circle color.
fill: When set to true fill the circle. When vpDisplayOpenCV is used, and color alpha channel is set, filling feature can handle transparency. See vpColor header class documentation.
thickness: Thickness of the circle. This parameter is only useful when fill is set to false.

displayCircleStatic(I: visp._visp.core.ImageRGBa, center: visp._visp.core.ImagePoint, radius: int, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a circle.

Parameters:

I: The image associated to the display.
center: Circle center position.
radius: Circle radius.
color: Circle color.
fill: When set to true fill the circle. When vpDisplayOpenCV is used, and color alpha channel is set, filling feature can handle transparency. See vpColor header class documentation.
thickness: Thickness of the circle. This parameter is only useful when fill is set to false.

displayCircleStatic(I: visp._visp.core.ImageRGBa, i: int, j: int, radius: int, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a circle.

Parameters:

I: The image associated to the display.
i: Circle center position.
j: Circle center position.
radius: Circle radius.
color: Circle color.
fill: When set to true fill the circle. When vpDisplayOpenCV is used, and color alpha channel is set, filling feature can handle transparency. See vpColor header class documentation.
thickness: Thickness of the circle. This parameter is only useful when fill is set to false.

static displayCross(*args, **kwargs)¶

Overloaded function.

displayCross(I: visp._visp.core.ImageGray, ip: visp._visp.core.ImagePoint, size: int, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a cross at the image point ip location.

Parameters:

I: The image associated to the display.
ip: Cross location.
size: Size (width and height) of the cross.
color: Cross color.
thickness: Thickness of the lines used to display the cross.

displayCross(I: visp._visp.core.ImageGray, i: int, j: int, size: int, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a cross at the image point (i,j) location.

Parameters:

I: The image associated to the display.
i: Cross location.
j: Cross location.
size: Size (width and height) of the cross.
color: Cross color.
thickness: Thickness of the lines used to display the cross.

displayCross(I: visp._visp.core.ImageRGBa, ip: visp._visp.core.ImagePoint, size: int, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a cross at the image point ip location.

Parameters:

I: The image associated to the display.
ip: Cross location.
size: Size (width and height) of the cross.
color: Cross color.
thickness: Thickness of the lines used to display the cross.

displayCross(I: visp._visp.core.ImageRGBa, i: int, j: int, size: int, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a cross at the image point (i,j) location.

Parameters:

I: The image associated to the display.
i: Cross location.
j: Cross location.
size: Size (width and height) of the cross.
color: Cross color.
thickness: Thickness of the lines used to display the cross.

static displayDotLine(*args, **kwargs)¶

Overloaded function.

displayDotLine(I: visp._visp.core.ImageGray, ip1: visp._visp.core.ImagePoint, ip2: visp._visp.core.ImagePoint, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a dashed line from image point ip1 to image point ip2 .

Parameters:

I: The image associated to the display.
ip1: Initial and final image points.
ip2: Initial and final image points.
color: Line color.
thickness: Dashed line thickness.

displayDotLine(I: visp._visp.core.ImageGray, i1: int, j1: int, i2: int, j2: int, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a dashed line from image point (i1,j1) to image point (i2,j2).

Parameters:

I: The image associated to the display.
i1: Initial image point.
j1: Initial image point.
i2: Final image point.
j2: Final image point.
color: Line color.
thickness: Dashed line thickness.

displayDotLine(I: visp._visp.core.ImageGray, ips: list[visp._visp.core.ImagePoint], closeTheShape: bool, color: visp._visp.core.Color, thickness: int = 1) -> None

Display dashed lines for the list of image points.

Parameters:

I: The image associated to the display.
ips: Vector of image points.
closeTheShape: If true, display a dashed line from the first and last image points.
color: Line color.
thickness: Dashed line thickness.

displayDotLine(I: visp._visp.core.ImageGray, ips: list[visp._visp.core.ImagePoint], closeTheShape: bool, color: visp._visp.core.Color, thickness: int = 1) -> None

Display dashed lines for the list of image points.

Parameters:

I: The image associated to the display.
ips: List of image points.
closeTheShape: If true, display a dashed line from the first and last image points.
color: Line color.
thickness: Dashed line thickness.

displayDotLine(I: visp._visp.core.ImageRGBa, ip1: visp._visp.core.ImagePoint, ip2: visp._visp.core.ImagePoint, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a dashed line from image point ip1 to image point ip2 .

Parameters:

I: The image associated to the display.
ip1: Initial and final image points.
ip2: Initial and final image points.
color: Line color.
thickness: Dashed line thickness.

displayDotLine(I: visp._visp.core.ImageRGBa, i1: int, j1: int, i2: int, j2: int, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a dashed line from image point (i1,j1) to image point (i2,j2).

Parameters:

I: The image associated to the display.
i1: Initial image point.
j1: Initial image point.
i2: Final image point.
j2: Final image point.
color: Line color.
thickness: Dashed line thickness.

displayDotLine(I: visp._visp.core.ImageRGBa, ips: list[visp._visp.core.ImagePoint], closeTheShape: bool, color: visp._visp.core.Color, thickness: int = 1) -> None

Display the dashed lines formed by the list of image points

Parameters:

I: The image associated to the display.
ips: Vector of image points.
closeTheShape: If true, display a dashed line from the first and last image points.
color: Line color.
thickness: Dashed line thickness.

displayDotLine(I: visp._visp.core.ImageRGBa, ips: list[visp._visp.core.ImagePoint], closeTheShape: bool, color: visp._visp.core.Color, thickness: int = 1) -> None

Display the dashed lines formed by the list of image points

Parameters:

I: The image associated to the display.
ips: List of image points.
closeTheShape: If true, display a dashed line from the first and last image points.
color: Line color.
thickness: Dashed line thickness.

static displayEllipse(*args, **kwargs)¶

Overloaded function.

displayEllipse(I: visp._visp.core.ImageGray, center: visp._visp.core.ImagePoint, coef1: float, coef2: float, coef3: float, use_normalized_centered_moments: bool, color: visp._visp.core.Color, thickness: int = 1, display_center: bool = false, display_arc: bool = false) -> None

Display an ellipse from its parameters expressed in pixels.The following example shows how to use for example this function to display the result of a tracking.

vpMeEllipse ellipse;
...
vpDisplay::display(I);
ellipse.track(I);

vpDisplay::displayEllipse(I, ellipse.getCenter(),
                          ellipse.get_nij()[0], ellipse.get_nij()[1], ellipse.get_nij()[2],
                          true, vpColor::orange, 1);
vpDisplay::flush(I);

Parameters:

I

Image to consider.

center

Center \((u_c, v_c)\) of the ellipse.

coef1

Depending on the parameter use_normalized_centered_moments these parameters are:

second order centered moments of the ellipse normalized by its area (i.e., such that \(n_{ij} = \mu_{ij}/a\) where \(\mu_{ij}\) are the centered moments and a the area) expressed in pixels.
the major and minor axis length in pixels and the eccentricity of the ellipse in radians: \(a, b, e\) .

coef2

Depending on the parameter use_normalized_centered_moments these parameters are:

second order centered moments of the ellipse normalized by its area (i.e., such that \(n_{ij} = \mu_{ij}/a\) where \(\mu_{ij}\) are the centered moments and a the area) expressed in pixels.
the major and minor axis length in pixels and the eccentricity of the ellipse in radians: \(a, b, e\) .

coef3

Depending on the parameter use_normalized_centered_moments these parameters are:

second order centered moments of the ellipse normalized by its area (i.e., such that \(n_{ij} = \mu_{ij}/a\) where \(\mu_{ij}\) are the centered moments and a the area) expressed in pixels.
the major and minor axis length in pixels and the eccentricity of the ellipse in radians: \(a, b, e\) .

use_normalized_centered_moments

When false, the parameters coef1, coef2, coef3 are the parameters \(a, b, e\) . When true, the parameters coef1, coef2, coef3 are rather the normalized centered moments \(n_{20}, n_{11}, n_{02}\) expressed in pixels. In that case, we compute the parameters a , b and e from the centered moments.

color

Ellipse color.

thickness

Ellipse thickness.

display_center

Display a cross at the center of the ellipse.

display_arc

Display a line between the center and the first arc extremity and a line between the center and the second arc extremity.

displayEllipse(I: visp._visp.core.ImageGray, center: visp._visp.core.ImagePoint, coef1: float, coef2: float, coef3: float, smallalpha: float, highalpha: float, use_normalized_centered_moments: bool, color: visp._visp.core.Color, thickness: int = 1, display_center: bool = false, display_arc: bool = false) -> None

Display an ellipse from its parameters expressed in pixels.The following example shows how to use for example this function to display the result of a tracking.

vpMeEllipse ellipse;
...
vpDisplay::display(I);
ellipse.track(I);

vpDisplay::displayEllipse(I, ellipse.getCenter(),
                          ellipse.get_nij()[0], ellipse.get_nij()[1], ellipse.get_nij()[2],
                          ellipse.getSmallestAngle(), ellipse.getHighestAngle(),
                          true, vpColor::orange, 1);
vpDisplay::flush(I);

Parameters:

I

Image to consider.

center

Center \((u_c, v_c)\) of the ellipse.

coef1

Depending on the parameter use_normalized_centered_moments these parameters are:

second order centered moments of the ellipse normalized by its area (i.e., such that \(n_{ij} = \mu_{ij}/a\) where \(\mu_{ij}\) are the centered moments and a the area) expressed in pixels.
the major and minor axis length in pixels and the eccentricity of the ellipse in radians: \(a, b, e\) .

coef2

Depending on the parameter use_normalized_centered_moments these parameters are:

second order centered moments of the ellipse normalized by its area (i.e., such that \(n_{ij} = \mu_{ij}/a\) where \(\mu_{ij}\) are the centered moments and a the area) expressed in pixels.
the major and minor axis length in pixels and the eccentricity of the ellipse in radians: \(a, b, e\) .

coef3

Depending on the parameter use_normalized_centered_moments these parameters are:

second order centered moments of the ellipse normalized by its area (i.e., such that \(n_{ij} = \mu_{ij}/a\) where \(\mu_{ij}\) are the centered moments and a the area) expressed in pixels.
the major and minor axis length in pixels and the eccentricity of the ellipse in radians: \(a, b, e\) .

smallalpha

Smallest \(alpha\) angle in rad (0 for a complete ellipse).

highalpha

Highest \(alpha\) angle in rad (2 \(\Pi\) for a complete ellipse).

use_normalized_centered_moments

color

Ellipse color.

thickness

Ellipse thickness.

display_center

Display a cross at the center of the ellipse.

display_arc

Display a line between the center and the first arc extremity and a line between the center and the second arc extremity.

displayEllipse(I: visp._visp.core.ImageRGBa, center: visp._visp.core.ImagePoint, coef1: float, coef2: float, coef3: float, use_centered_moments: bool, color: visp._visp.core.Color, thickness: int = 1, display_center: bool = false, display_arc: bool = false) -> None

Display an ellipse from its parameters expressed in pixels.The following example shows how to use for example this function to display the result of a tracking.

vpMeEllipse ellipse;
...
vpDisplay::display(I);
ellipse.track(I);

vpDisplay::displayEllipse(I, ellipse.getCenter(),
                          ellipse.get_nij()[0], ellipse.get_nij()[1], ellipse.get_nij()[2],
                          true, vpColor::orange, 1);
vpDisplay::flush(I);

Parameters:

I

Image to consider.

center

Center \((u_c, v_c)\) of the ellipse.

coef1

Depending on the parameter use_normalized_centered_moments these parameters are:

second order centered moments of the ellipse normalized by its area (i.e., such that \(n_{ij} = \mu_{ij}/a\) where \(\mu_{ij}\) are the centered moments and a the area) expressed in pixels.
the major and minor axis length in pixels and the eccentricity of the ellipse in radians: \(a, b, e\) .

coef2

Depending on the parameter use_normalized_centered_moments these parameters are:

second order centered moments of the ellipse normalized by its area (i.e., such that \(n_{ij} = \mu_{ij}/a\) where \(\mu_{ij}\) are the centered moments and a the area) expressed in pixels.
the major and minor axis length in pixels and the eccentricity of the ellipse in radians: \(a, b, e\) .

coef3

Depending on the parameter use_normalized_centered_moments these parameters are:

second order centered moments of the ellipse normalized by its area (i.e., such that \(n_{ij} = \mu_{ij}/a\) where \(\mu_{ij}\) are the centered moments and a the area) expressed in pixels.
the major and minor axis length in pixels and the eccentricity of the ellipse in radians: \(a, b, e\) .

color

Ellipse color.

thickness

Ellipse thickness.

display_center

Display a cross at the center of the ellipse.

display_arc

Display a line between the center and the first arc extremity and a line between the center and the second arc extremity.

displayEllipse(I: visp._visp.core.ImageRGBa, center: visp._visp.core.ImagePoint, coef1: float, coef2: float, coef3: float, theta1: float, theta2: float, use_centered_moments: bool, color: visp._visp.core.Color, thickness: int = 1, display_center: bool = false, display_arc: bool = false) -> None

Display an ellipse from its parameters expressed in pixels.The following example shows how to use for example this function to display the result of a tracking.

vpMeEllipse ellipse;
...
vpDisplay::display(I);
ellipse.track(I);

vpDisplay::displayEllipse(I, ellipse.getCenter(),
                          ellipse.get_nij()[0], ellipse.get_nij()[1], ellipse.get_nij()[2],
                          ellipse.getSmallestAngle(), ellipse.getHighestAngle(),
                          true, vpColor::orange, 1);
vpDisplay::flush(I);

Parameters:

I

Image to consider.

center

Center \((u_c, v_c)\) of the ellipse.

coef1

Depending on the parameter use_normalized_centered_moments these parameters are:

second order centered moments of the ellipse normalized by its area (i.e., such that \(n_{ij} = \mu_{ij}/a\) where \(\mu_{ij}\) are the centered moments and a the area) expressed in pixels.
the major and minor axis length in pixels and the eccentricity of the ellipse in radians: \(a, b, e\) .

coef2

Depending on the parameter use_normalized_centered_moments these parameters are:

second order centered moments of the ellipse normalized by its area (i.e., such that \(n_{ij} = \mu_{ij}/a\) where \(\mu_{ij}\) are the centered moments and a the area) expressed in pixels.
the major and minor axis length in pixels and the eccentricity of the ellipse in radians: \(a, b, e\) .

coef3

Depending on the parameter use_normalized_centered_moments these parameters are:

second order centered moments of the ellipse normalized by its area (i.e., such that \(n_{ij} = \mu_{ij}/a\) where \(\mu_{ij}\) are the centered moments and a the area) expressed in pixels.
the major and minor axis length in pixels and the eccentricity of the ellipse in radians: \(a, b, e\) .

color

Ellipse color.

thickness

Ellipse thickness.

display_center

Display a cross at the center of the ellipse.

display_arc

Display a line between the center and the first arc extremity and a line between the center and the second arc extremity.

static displayFrame(*args, **kwargs)¶

Overloaded function.

displayFrame(I: visp._visp.core.ImageGray, cMo: visp._visp.core.HomogeneousMatrix, cam: visp._visp.core.CameraParameters, size: float, color: visp._visp.core.Color = vpColor::none, thickness: int = 1, offset: visp._visp.core.ImagePoint = vpImagePoint(0,0), frameName: str = , textColor: visp._visp.core.Color = vpColor::black, textOffset: visp._visp.core.ImagePoint = vpImagePoint(15,15)) -> None

Display the projection of an object frame represented by 3 arrows in the image. Red, green and blue arrows correspond to frame X, Y and Z axis respectively.

Parameters:

I: The image associated to the display.
cMo: Homogeneous matrix that gives the transformation between the camera frame and the object frame to project in the image.
cam: Camera intrinsic parameters.
size: Size of the object frame.
color: Color used to display the frame in the image.
thickness: the thickness of the line.
offset: Offset in pixels applied to the frame origin location in the image.
frameName: Text to display along side the origin of the frame.
textColor: Color of the text associated to frameName .
textOffset: Offset used to shift the text from the origin of the frame.

displayFrame(I: visp._visp.core.ImageRGBa, cMo: visp._visp.core.HomogeneousMatrix, cam: visp._visp.core.CameraParameters, size: float, color: visp._visp.core.Color = vpColor::none, thickness: int = 1, offset: visp._visp.core.ImagePoint = vpImagePoint(0,0), frameName: str = , textColor: visp._visp.core.Color = vpColor::black, textOffset: visp._visp.core.ImagePoint = vpImagePoint(15,15)) -> None

Display the projection of an object frame represented by 3 arrows in the image. Red, green and blue arrows correspond to frame X, Y and Z axis respectively.

Parameters:

I: The image associated to the display.
cMo: Homogeneous matrix that gives the transformation between the camera frame and the object frame to project in the image.
cam: Camera intrinsic parameters.
size: Size of the object frame.
color: Color used to display the frame in the image.
thickness: the thickness of the line.
offset: Offset in pixels applied to the frame origin location in the image.
frameName: Text to display along side the origin of the frame.
textColor: Color of the text associated to frameName .
textOffset: Offset used to shift the text from the origin of the frame.

static displayLine(*args, **kwargs)¶

Overloaded function.

displayLine(I: visp._visp.core.ImageGray, ip1: visp._visp.core.ImagePoint, ip2: visp._visp.core.ImagePoint, color: visp._visp.core.Color, thickness: int = 1, segment: bool = true) -> None

Display a line from image point ip1 to image point ip2 .

Parameters:

I: The image associated to the display.
ip1: Initial and final image points.
ip2: Initial and final image points.
color: Line color.
thickness: Line thickness.
segment: If true (default) display the segment between the two image points. If false, display the line passing through the two image points.

displayLine(I: visp._visp.core.ImageGray, i1: int, j1: int, i2: int, j2: int, color: visp._visp.core.Color, thickness: int = 1, segment: bool = true) -> None

Display a line from image point (i1,j1) to image point (i2,j2).

Parameters:

I: The image associated to the display.
i1: Initial image point.
j1: Initial image point.
i2: Final image point.
j2: Final image point.
color: Line color.
thickness: Line thickness.
segment: If true (default) display the segment between the two image points. If false, display the line passing through the two image points.

displayLine(I: visp._visp.core.ImageGray, ips: list[visp._visp.core.ImagePoint], closeTheShape: bool, color: visp._visp.core.Color, thickness: int = 1) -> None

Display the lines formed by the list of image points.

Parameters:

I: The image associated to the display.
ips: Vector of image points.
closeTheShape: If true, display a line from the first and last image points.
color: Line color.
thickness: Line thickness.

displayLine(I: visp._visp.core.ImageGray, ips: list[visp._visp.core.ImagePoint], closeTheShape: bool, color: visp._visp.core.Color, thickness: int = 1) -> None

Display the lines formed by the list of image points.

Parameters:

I: The image associated to the display.
ips: List of image points.
closeTheShape: If true, display a line from the first and last image points.
color: Line color.
thickness: Line thickness.

displayLine(I: visp._visp.core.ImageRGBa, ip1: visp._visp.core.ImagePoint, ip2: visp._visp.core.ImagePoint, color: visp._visp.core.Color, thickness: int = 1, segment: bool = true) -> None

Display a line from image point ip1 to image point ip2 .

Parameters:

I: The image associated to the display.
ip1: Initial and final image points.
ip2: Initial and final image points.
color: Line color.
thickness: Line thickness.
segment: If true (default) display the segment between the two image points. If false, display the line passing through the two image points.

displayLine(I: visp._visp.core.ImageRGBa, i1: int, j1: int, i2: int, j2: int, color: visp._visp.core.Color, thickness: int = 1, segment: bool = true) -> None

Display a line from image point (i1,j1) to image point (i2,j2).

Parameters:

I: The image associated to the display.
i1: Initial image point.
j1: Initial image point.
i2: Final image point.
j2: Final image point.
color: Line color.
thickness: Line thickness.
segment: If true (default) display the segment between the two image points. If false, display the line passing through the two image points.

displayLine(I: visp._visp.core.ImageRGBa, ips: list[visp._visp.core.ImagePoint], closeTheShape: bool, color: visp._visp.core.Color, thickness: int = 1) -> None

Display the lines formed by the list of image points.

Parameters:

I: The image associated to the display.
ips: Vector of image points.
closeTheShape: If true, draw a line from the first and last image points.
color: Line color.
thickness: Line thickness.

displayLine(I: visp._visp.core.ImageRGBa, ips: list[visp._visp.core.ImagePoint], closeTheShape: bool, color: visp._visp.core.Color, thickness: int = 1) -> None

Display the lines formed by the list of image points.

Parameters:

I: The image associated to the display.
ips: List of image points.
closeTheShape: If true, draw a line from the first and last image points.
color: Line color.
thickness: Line thickness.

static displayPoint(*args, **kwargs)¶

Overloaded function.

displayPoint(I: visp._visp.core.ImageGray, ip: visp._visp.core.ImagePoint, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a point at the image point ip location.

Parameters:

I: The image associated to the display.
ip: Point location.
color: Point color.
thickness: Thickness of the point

displayPoint(I: visp._visp.core.ImageGray, i: int, j: int, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a point at the image point (i,j) location.

Parameters:

I: The image associated to the display.
i: Point location.
j: Point location.
color: Point color.
thickness: Thickness of the point

displayPoint(I: visp._visp.core.ImageRGBa, ip: visp._visp.core.ImagePoint, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a point at the image point ip location.

Parameters:

I: The image associated to the display.
ip: Point location.
color: Point color.
thickness: Thickness of the point

displayPoint(I: visp._visp.core.ImageRGBa, i: int, j: int, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a point at the image point (i,j) location.

Parameters:

I: The image associated to the display.
i: Point location.
j: Point location.
color: Point color.
thickness: Thickness of the point

static displayPolygon(*args, **kwargs)¶

Overloaded function.

displayPolygon(I: visp._visp.core.ImageGray, vip: list[visp._visp.core.ImagePoint], color: visp._visp.core.Color, thickness: int = 1, closed: bool = true) -> None

Display a polygon defined by a vector of image points.

Parameters:

I: The image associated to the display.
vip: Vector of image point that define the vertexes of the polygon.
color: Line color.
thickness: Line thickness.
closed: When true display a closed polygon with a segment between first and last image point.

displayPolygon(I: visp._visp.core.ImageGray, polygon: visp._visp.core.Polygon, color: visp._visp.core.Color, thickness: int = 1, closed: bool = true) -> None

Display a polygon defined by a set of image points.

Parameters:

I: The image associated to the display.
polygon: Polygon to display.
color: Line color.
thickness: Line thickness.
closed: When true display a closed polygon with a segment between first and last image point.

displayPolygon(I: visp._visp.core.ImageRGBa, vip: list[visp._visp.core.ImagePoint], color: visp._visp.core.Color, thickness: int = 1, closed: bool = true) -> None

Display a polygon defined by a vector of image points.

Parameters:

I: The image associated to the display.
vip: Vector of image point that define the vertexes of the polygon.
color: Line color.
thickness: Line thickness.
closed: When true display a closed polygon with a segment between first and last image point.

displayPolygon(I: visp._visp.core.ImageRGBa, polygon: visp._visp.core.Polygon, color: visp._visp.core.Color, thickness: int = 1, closed: bool = true) -> None

Display a polygon defined by a set of image points.

Parameters:

I: The image associated to the display.
polygon: Polygon to display.
color: Line color.
thickness: Line thickness.
closed: When true display a closed polygon with a segment between first and last image point.

static displayROI(*args, **kwargs)¶

Overloaded function.

displayROI(I: visp._visp.core.ImageGray, roi: visp._visp.core.Rect) -> None

Update the display with the content of the image that is in the region of interest.

Parameters:

I: Image.
roi: Region of interest.

displayROI(I: visp._visp.core.ImageRGBa, roi: visp._visp.core.Rect) -> None

Update the display with the content of the image that is in the region of interest.

Parameters:

I: Image.
roi: Region of interest.

static displayRectangle(*args, **kwargs)¶

Overloaded function.

displayRectangle(I: visp._visp.core.ImageGray, topLeft: visp._visp.core.ImagePoint, width: int, height: int, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a rectangle with topLeft as the top-left corner and width and height the rectangle size.

Parameters:

I: The image associated to the display.
topLeft: Top-left corner of the rectangle.
width: Rectangle size.
height: Rectangle size.
color: Rectangle color.
fill: When set to true fill the rectangle. When vpDisplayOpenCV is used, and color alpha channel is set, filling feature can handle transparency. See vpColor header class documentation.
thickness: Thickness of the four lines used to display the rectangle. This parameter is only useful when fill is set to false.

displayRectangle(I: visp._visp.core.ImageGray, topLeft: visp._visp.core.ImagePoint, bottomRight: visp._visp.core.ImagePoint, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a rectangle with topLeft as the top-left corner and width and height the rectangle size.

Parameters:

I: The image associated to the display.
topLeft: Top-left corner of the rectangle.
bottomRight: Bottom-right corner of the rectangle.
color: Rectangle color.
fill: When set to true fill the rectangle. When vpDisplayOpenCV is used, and color alpha channel is set, filling feature can handle transparency. See vpColor header class documentation.
thickness: Thickness of the four lines used to display the rectangle. This parameter is only useful when fill is set to false.

displayRectangle(I: visp._visp.core.ImageGray, rectangle: visp._visp.core.Rect, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a rectangle with topLeft as the top-left corner and width and height the rectangle size.

Parameters:

I: The image associated to the display.
rectangle: Rectangle characteristics.
color: Rectangle color.
fill: When set to true fill the rectangle. When vpDisplayOpenCV is used, and color alpha channel is set, filling feature can handle transparency. See vpColor header class documentation.
thickness: Thickness of the four lines used to display the rectangle. This parameter is only useful when fill is set to false.

displayRectangle(I: visp._visp.core.ImageGray, center: visp._visp.core.ImagePoint, angle: float, width: int, height: int, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a rectangle defined by its center, its orientation (angle) and its size.

Parameters:

I: Image associated to the display.
center: Rectangle center point.
angle: Angle in radians width an horizontal axis oriented from left to right.
width: Rectangle size.
height: Rectangle size.
color: Rectangle color.
thickness: Thickness of the four lines used to display the rectangle.

displayRectangle(I: visp._visp.core.ImageGray, i: int, j: int, width: int, height: int, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a rectangle with (i,j) as the top-left corner and width and height the rectangle size.

Parameters:

I: The image associated to the display.
i: Top-left corner of the rectangle.
j: Top-left corner of the rectangle.
width: Rectangle size.
height: Rectangle size.
color: Rectangle color.
fill: When set to true fill the rectangle.
thickness: Thickness of the four lines used to display the rectangle. This parameter is only useful when fill is set to false.

displayRectangle(I: visp._visp.core.ImageGray, i: int, j: int, angle: float, width: int, height: int, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a rectangle defined by its center, its orientation (angle) and its size.

Parameters:

I: Image associated to the display.
i: Rectangle center point.
j: Rectangle center point.
angle: Angle in radians width an horizontal axis oriented from left to right.
width: Rectangle size.
height: Rectangle size.
color: Rectangle color.
thickness: Thickness of the four lines used to display the rectangle.

displayRectangle(I: visp._visp.core.ImageRGBa, topLeft: visp._visp.core.ImagePoint, width: int, height: int, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a rectangle with topLeft as the top-left corner and width and height the rectangle size.

Parameters:

I: The image associated to the display.
topLeft: Top-left corner of the rectangle.
width: Rectangle size.
height: Rectangle size.
color: Rectangle color.
fill: When set to true fill the rectangle. When vpDisplayOpenCV is used, and color alpha channel is set, filling feature can handle transparency. See vpColor header class documentation.
thickness: Thickness of the four lines used to display the rectangle. This parameter is only useful when fill is set to false.

displayRectangle(I: visp._visp.core.ImageRGBa, topLeft: visp._visp.core.ImagePoint, bottomRight: visp._visp.core.ImagePoint, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a rectangle with topLeft as the top-left corner and width and height the rectangle size.

Parameters:

I: The image associated to the display.
topLeft: Top-left corner of the rectangle.
bottomRight: Bottom-right corner of the rectangle.
color: Rectangle color.
fill: When set to true fill the rectangle. When vpDisplayOpenCV is used, and color alpha channel is set, filling feature can handle transparency. See vpColor header class documentation.
thickness: Thickness of the four lines used to display the rectangle. This parameter is only useful when fill is set to false.

displayRectangle(I: visp._visp.core.ImageRGBa, rectangle: visp._visp.core.Rect, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a rectangle with topLeft as the top-left corner and width and height the rectangle size.

Parameters:

I: The image associated to the display.
rectangle: Rectangle characteristics.
color: Rectangle color.
fill: When set to true fill the rectangle. When vpDisplayOpenCV is used, and color alpha channel is set, filling feature can handle transparency. See vpColor header class documentation.
thickness: Thickness of the four lines used to display the rectangle. This parameter is only useful when fill is set to false.

displayRectangle(I: visp._visp.core.ImageRGBa, center: visp._visp.core.ImagePoint, angle: float, width: int, height: int, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a rectangle defined by its center, its orientation (angle) and its size.

Parameters:

I: Image associated to the display.
center: Rectangle center point.
angle: Angle in radians width an horizontal axis oriented from left to right.
width: Rectangle size.
height: Rectangle size.
color: Rectangle color.
thickness: Thickness of the four lines used to display the rectangle.

displayRectangle(I: visp._visp.core.ImageRGBa, i: int, j: int, width: int, height: int, color: visp._visp.core.Color, fill: bool = false, thickness: int = 1) -> None

Display a rectangle with (i,j) as the top-left corner and width and height the rectangle size.

Parameters:

I: The image associated to the display.
i: Top-left corner of the rectangle.
j: Top-left corner of the rectangle.
width: Rectangle size.
height: Rectangle size.
color: Rectangle color.
fill: When set to true fill the rectangle.
thickness: Thickness of the four lines used to display the rectangle. This parameter is only useful when fill is set to false.

displayRectangle(I: visp._visp.core.ImageRGBa, i: int, j: int, angle: float, width: int, height: int, color: visp._visp.core.Color, thickness: int = 1) -> None

Display a rectangle defined by its center, its orientation (angle) and its size.

Parameters:

I: Image associated to the display.
i: Rectangle center point.
j: Rectangle center point.
angle: Angle in radians width an horizontal axis oriented from left to right.
width: Rectangle size.
height: Rectangle size.
color: Rectangle color.
thickness: Thickness of the four lines used to display the rectangle.

static displayText(*args, **kwargs)¶

Overloaded function.

displayText(I: visp._visp.core.ImageGray, ip: visp._visp.core.ImagePoint, s: str, color: visp._visp.core.Color) -> None

Display a string at the image point ip location.

To select the font used to display the string, use setFont() .

Note

See setFont()

Parameters:

I: Image associated to the display.
ip: Upper left image point location of the string in the display.
s: String to display in overlay.
color: String color.

displayText(I: visp._visp.core.ImageGray, i: int, j: int, s: str, color: visp._visp.core.Color) -> None

Display a string at the image point (i,j) location.

To select the font used to display the string, use setFont() .

Note

See setFont()

Parameters:

I: Image associated to the display.
i: Upper left image point location of the string in the display.
j: Upper left image point location of the string in the display.
s: String to display in overlay.
color: String color.

displayText(I: visp._visp.core.ImageRGBa, ip: visp._visp.core.ImagePoint, s: str, color: visp._visp.core.Color) -> None

Display a string at the image point ip location.

To select the font used to display the string, use setFont() .

Note

See setFont()

Parameters:

I: Image associated to the display.
ip: Upper left image point location of the string in the display.
s: String to display in overlay.
color: String color.

displayText(I: visp._visp.core.ImageRGBa, i: int, j: int, s: str, color: visp._visp.core.Color) -> None

Display a string at the image point (i,j) location.

To select the font used to display the string, use setFont() .

Note

See setFont()

Parameters:

I: Image associated to the display.
i: Upper left image point location of the string in the display.
j: Upper left image point location of the string in the display.
s: String to display in overlay.
color: String color.

static flush(*args, **kwargs)¶

Overloaded function.

flush(I: visp._visp.core.ImageGray) -> None

Flushes the output buffer associated to image I display. It’s necessary to use this function to see the results of any drawing.

Warning

This function is particular and must be called to show the overlay. Because it’s time spending, use it parcimoniously.

#include <visp3/core/vpColor.h>
#include <visp3/core/vpDisplay.h>
#include <visp3/core/vpImage.h>
#include <visp3/core/vpImagePoint.h>
#include <visp3/gui/vpDisplayGDI.h>

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

int main() {
  vpImage<unsigned char> I(240, 380);
  vpDisplayGDI d;
  d.init(I);
  vpDisplay::display(I); // display the image
  vpImagePoint center;
  unsigned int radius = 100;
  vpDisplay::displayCircle(I, center, radius, vpColor::red);

  vpDisplay::flush(I); // Mandatory to display the requested features.
}

Note

See flushROI()

flush(I: visp._visp.core.ImageRGBa) -> None

Flushes the output buffer associated to image I display. It’s necessary to use this function to see the results of any drawing.

Warning

This function is particular and must be called to show the overlay. Because it’s time spending, use it parcimoniously.

#include <visp3/core/vpColor.h>
#include <visp3/core/vpDisplay.h>
#include <visp3/core/vpImage.h>
#include <visp3/core/vpImagePoint.h>
#include <visp3/gui/vpDisplayGDI.h>

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

int main() {
  vpImage<vpRGBa> I(240, 380);
  vpDisplayGDI d;
  d.init(I);
  vpDisplay::display(I); // display the image
  vpImagePoint center;
  unsigned int radius = 100;
  vpDisplay::displayCircle(I, center, radius, vpColor::red);

  vpDisplay::flush(I); // Mandatory to display the requested features.
}

Note

See flushROI()

static flushROI(*args, **kwargs)¶

Overloaded function.

flushROI(I: visp._visp.core.ImageGray, roi: visp._visp.core.Rect) -> None

Flushes the output buffer associated to image I display. It’s necessary to use this function to see the results of any drawing.

Warning

This function is particular and must be called to show the overlay. Because it’s time spending, use it parcimoniously.

Note

See flush()

flushROI(I: visp._visp.core.ImageRGBa, roi: visp._visp.core.Rect) -> None

Flushes the output buffer associated to image I display. It’s necessary to use this function to see the results of any drawing.

Warning

This function is particular and must be called to show the overlay. Because it’s time spending, use it parsimoniously.

Note

See flush()

static getClick(*args, **kwargs)¶

Overloaded function.

getClick(I: visp._visp.core.ImageGray, blocking: bool = true) -> bool

Wait for a click from one of the mouse button.

Parameters:

I

[in] : The displayed image.

blocking

[in] : Blocking behavior.

When set to true, this method waits until a mouse button is pressed and then returns always true.
When set to false, returns true only if a mouse button is pressed, otherwise returns false.

Returns:

true if a button was clicked. This is always the case if blocking is set to true .
false if no button was clicked. This can occur if blocking is set to false .

getClick(I: visp._visp.core.ImageGray, ip: visp._visp.core.ImagePoint, blocking: bool = true) -> bool

Wait for a click from one of the mouse button and get the position of the clicked image point.

Parameters:

I

[in] : The displayed image.

ip

[out] : The coordinates of the clicked image point.

blocking

[in] : Blocking behavior.

When set to true, this method waits until a mouse button is pressed and then returns always true.
When set to false, returns true only if a mouse button is pressed, otherwise returns false.

Returns:

true if a mouse button is pressed, false otherwise. If a button is pressed, the location of the mouse pointer is updated in ip .

getClick(I: visp._visp.core.ImageGray, ip: visp._visp.core.ImagePoint, button: visp._visp.core.MouseButton.MouseButtonType, blocking: bool = true) -> bool

Wait for a mouse button click and get the position of the clicked image point. The button used to click is also set.

Parameters:

I

[in] : The displayed image.

ip

[out] : The coordinates of the clicked image point.

button

[out] : The button used to click.

blocking

[in] :

When set to true, this method waits until a mouse button is pressed and then returns always true.
When set to false, returns true only if a mouse button is pressed, otherwise returns false.

Returns:

true if a mouse button is pressed, false otherwise. If a button is pressed, the location of the mouse pointer is updated in ip .

getClick(I: visp._visp.core.ImageGray, button: visp._visp.core.MouseButton.MouseButtonType, blocking: bool = true) -> bool

Wait for a mouse button click and get the position of the clicked image point. The button used to click is also set.

Parameters:

I

[in] : The displayed image.

button

[out] : The button used to click.

blocking

[in] :

When set to true, this method waits until a mouse button is pressed and then returns always true.
When set to false, returns true only if a mouse button is pressed, otherwise returns false.

Returns:

true if a mouse button is pressed, false otherwise.

getClick(I: visp._visp.core.ImageRGBa, blocking: bool = true) -> bool

Wait for a click from one of the mouse button.

Parameters:

I

[in] : The displayed image.

blocking

[in] : Blocking behavior.

When set to true, this method waits until a mouse button is pressed and then returns always true.
When set to false, returns true only if a mouse button is pressed, otherwise returns false.

Returns:

true if a button was clicked. This is always the case if blocking is set to true .
false if no button was clicked. This can occur if blocking is set to false .

getClick(I: visp._visp.core.ImageRGBa, ip: visp._visp.core.ImagePoint, blocking: bool = true) -> bool

Wait for a click from one of the mouse button and get the position of the clicked image point.

Parameters:

I

[in] : The displayed image.

ip

[out] : The coordinates of the clicked image point.

blocking

[in] : Blocking behavior.

When set to true, this method waits until a mouse button is pressed and then returns always true.
When set to false, returns true only if a mouse button is pressed, otherwise returns false.

Returns:

true if a mouse button is pressed, false otherwise. If a button is pressed, the location of the mouse pointer is updated in ip .

getClick(I: visp._visp.core.ImageRGBa, ip: visp._visp.core.ImagePoint, button: visp._visp.core.MouseButton.MouseButtonType, blocking: bool = true) -> bool

Wait for a mouse button click and get the position of the clicked image point. The button used to click is also set.

Parameters:

I

[in] : The displayed image.

ip

[out] : The coordinates of the clicked image point.

button

[out] : The button used to click.

blocking

[in] :

When set to true, this method waits until a mouse button is pressed and then returns always true.
When set to false, returns true only if a mouse button is pressed, otherwise returns false.

Returns:

true if a mouse button is pressed, false otherwise. If a button is pressed, the location of the mouse pointer is updated in ip .

getClick(I: visp._visp.core.ImageRGBa, button: visp._visp.core.MouseButton.MouseButtonType, blocking: bool = true) -> bool

Wait for a mouse button click and get the position of the clicked image point. The button used to click is also set.

Parameters:

I

[in] : The displayed image.

button

[out] : The button used to click.

blocking

[in] :

When set to true, this method waits until a mouse button is pressed and then returns always true.
When set to false, returns true only if a mouse button is pressed, otherwise returns false.

Returns:

true if a mouse button is pressed, false otherwise.

static getClickUp(*args, **kwargs)¶

Overloaded function.

getClickUp(I: visp._visp.core.ImageGray, ip: visp._visp.core.ImagePoint, button: visp._visp.core.MouseButton.MouseButtonType, blocking: bool = true) -> bool

Wait for a mouse button click release and get the position of the clicked image point. The button used to click is also set.

Parameters:

I

[in] : The displayed image.

ip

[out] : The coordinates of the clicked image point.

button

[out] : The clicked button.

blocking

[in] :

When set to true, this method waits until a mouse button is released and then returns always true.
When set to false, returns true only if a mouse button is released, otherwise returns false.

Returns:

true if a mouse button is released, false otherwise. If a button is released, the location of the mouse pointer is updated in ip .

getClickUp(I: visp._visp.core.ImageGray, button: visp._visp.core.MouseButton.MouseButtonType, blocking: bool = true) -> bool

Wait for a mouse button click release and get the position of the clicked image point. The button used to click is also set.

Parameters:

I

[in] : The displayed image.

button

[out] : The clicked button.

blocking

[in] :

When set to true, this method waits until a mouse button is released and then returns always true.
When set to false, returns true only if a mouse button is released, otherwise returns false.

Returns:

true if a mouse button is released, false otherwise.

getClickUp(I: visp._visp.core.ImageRGBa, ip: visp._visp.core.ImagePoint, button: visp._visp.core.MouseButton.MouseButtonType, blocking: bool = true) -> bool

Wait for a mouse button click release and get the position of the clicked image point. The button used to click is also set.

Parameters:

I

[in] : The displayed image.

ip

[out] : The coordinates of the clicked image point.

button

[out] : The clicked button.

blocking

[in] :

When set to true, this method waits until a mouse button is released and then returns always true.
When set to false, returns true only if a mouse button is released, otherwise returns false.

Returns:

true if a mouse button is released, false otherwise. If a button is released, the location of the mouse pointer is updated in ip .

getClickUp(I: visp._visp.core.ImageRGBa, button: visp._visp.core.MouseButton.MouseButtonType, blocking: bool = true) -> bool

Wait for a mouse button click release and get the position of the clicked image point. The button used to click is also set.

Parameters:

I

[in] : The displayed image.

button

[out] : The clicked button.

blocking

[in] :

When set to true, this method waits until a mouse button is released and then returns always true.
When set to false, returns true only if a mouse button is released, otherwise returns false.

Returns:

true if a mouse button is released, false otherwise.

getDownScalingFactor(self) → int¶: Return the value of the down scale factor applied to the image in order to reduce the size of the window used to display the image.

getHeight(self) → int¶: Return the display height.

Note

See getWidth()

getImage(self, I: visp._visp.core.ImageRGBa) → None¶: Get the window pixmap and put it in vpRGBa image.

static getImageDownScalingFactor(*args, **kwargs)¶

Overloaded function.

getImageDownScalingFactor(I: visp._visp.core.ImageGray) -> int

Return the value of the down scale factor applied to the image in order to reduce the size of the window used to display the image. When display is not initialized, returns 1.

Parameters:

I: Image associated to the display window.

getImageDownScalingFactor(I: visp._visp.core.ImageRGBa) -> int

Return the value of the down scale factor applied to the image in order to reduce the size of the window used to display the image. When display is not initialized, returns 1.

Parameters:

I: Image associated to the display window.

static getKeyboardEvent(*args, **kwargs)¶

Overloaded function.

getKeyboardEvent(I: visp._visp.core.ImageGray, blocking: bool = true) -> bool

Get a keyboard event.

Below you will find an example showing how to use this method.

#include <visp3/core/vpConfig.h>
#include <visp3/gui/vpDisplayD3D.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayGTK.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/gui/vpDisplayX.h>

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

int main()
{
  vpImage<unsigned char> I(240, 320); // Create a black image

  vpDisplay *d;

#if defined(VISP_HAVE_X11)
  d = new vpDisplayX;
#elif defined(VISP_HAVE_GTK)
  d = new vpDisplayGTK;
#elif defined(VISP_HAVE_GDI)
  d = new vpDisplayGDI;
#elif defined(VISP_HAVE_D3D9)
  d = new vpDisplayD3D;
#elif defined(HAVE_OPENCV_HIGHGUI)
  d = new vpDisplayOpenCV;
#else
  std::cout << "Sorry, no video device is available" << std::endl;
  return -1;
#endif

  // Initialize the display with the image I. Display and image are
  // now link together.
#ifdef VISP_HAVE_DISPLAY
  d->init(I);
#endif

  // Set the display background with image I content
  vpDisplay::display(I);

  // Flush the foreground and background display
  vpDisplay::flush(I);

  // Wait for keyboard event
  std::cout << "Waiting a keyboard event..." << std::endl;
  vpDisplay::getKeyboardEvent(I, true);
  std::cout << "A keyboard event was detected" << std::endl;

  // Non blocking keyboard event loop
  int cpt_event = 0;
  std::cout << "Enter a non blocking keyboard event detection loop..." << std::endl;
  do {
    bool event = vpDisplay::getKeyboardEvent(I, false);
    if (event) {
      std::cout << "A keyboard event was detected" << std::endl;
      cpt_event ++;
    }

    vpTime::wait(5); // wait 5 ms
  } while(cpt_event < 5);

#ifdef VISP_HAVE_DISPLAY
  delete d;
#endif
}

Parameters:

I

[in] : The displayed image.

blocking

[in] : Blocking behavior.

When set to true, this method waits until a key is pressed and then returns always true.
When set to false, returns true only if a key is pressed, otherwise returns false.

Returns:

true if a key was pressed. This is always the case if blocking is set to true .
false if no key was pressed. This can occur if blocking is set to false .

getKeyboardEvent(I: visp._visp.core.ImageGray, blocking: bool = true) -> tuple[bool, str]

Get a keyboard event.

Below you will find an example showing how to use this method.

#include <visp3/gui/vpDisplayD3D.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayGTK.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/gui/vpDisplayX.h>

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

int main()
{
  vpImage<unsigned char> I(240, 320); // Create a black image

  vpDisplay *d;

#if defined(VISP_HAVE_X11)
  d = new vpDisplayX;
#elif defined(VISP_HAVE_GTK)
  d = new vpDisplayGTK;
#elif defined(VISP_HAVE_GDI)
  d = new vpDisplayGDI;
#elif defined(VISP_HAVE_D3D9)
  d = new vpDisplayD3D;
#elif defined(HAVE_OPENCV_HIGHGUI)
  d = new vpDisplayOpenCV;
#else
  std::cout << "Sorry, no video device is available" << std::endl;
  return -1;
#endif

  // Initialize the display with the image I. Display and image are
  // now link together.
#ifdef VISP_HAVE_DISPLAY
  d->init(I);
#endif

  // Set the display background with image I content
  vpDisplay::display(I);

  // Flush the foreground and background display
  vpDisplay::flush(I);

  // Wait for keyboard event
  std::cout << "Waiting a keyboard event..." << std::endl;
  vpDisplay::getKeyboardEvent(I, true);
  std::cout << "A keyboard event was detected" << std::endl;

  // Non blocking keyboard event loop
  int cpt_event = 0;
  std::string key;
  std::cout << "Enter a non blocking keyboard event detection loop..." << std::endl;
  do {
    bool event = vpDisplay::getKeyboardEvent(I, key, false);
    if (event) {
      std::cout << "Key detected: " << key << std::endl;
      cpt_event ++;
    }

    vpTime::wait(5); // wait 5 ms
  } while(cpt_event < 5);

#ifdef VISP_HAVE_DISPLAY
  delete d;
#endif
}

Parameters:

I

[in] : The displayed image.

blocking

[in] : Blocking behavior.

When set to true, this method waits until a key is pressed and then returns always true.
When set to false, returns true only if a key is pressed, otherwise returns false.

Returns:

A tuple containing:

true if a key was pressed. This is always the case if blocking is set to true .
false if no key was pressed. This can occur if blocking is set to false .
- key: [out]: If possible, an ISO Latin-1 character corresponding to the keyboard key.

getKeyboardEvent(I: visp._visp.core.ImageRGBa, blocking: bool = true) -> bool

Get a keyboard event.

Below you will find an example showing how to use this method.

#include <visp3/core/vpConfig.h>
#include <visp3/gui/vpDisplayD3D.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayGTK.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/gui/vpDisplayX.h>

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

int main()
{
  vpImage<vpRGBa> I(240, 320); // Create a black image

  vpDisplay *d;

#if defined(VISP_HAVE_X11)
  d = new vpDisplayX;
#elif defined(VISP_HAVE_GTK)
  d = new vpDisplayGTK;
#elif defined(VISP_HAVE_GDI)
  d = new vpDisplayGDI;
#elif defined(VISP_HAVE_D3D9)
  d = new vpDisplayD3D;
#elif defined(HAVE_OPENCV_HIGHGUI)
  d = new vpDisplayOpenCV;
#else
  std::cout << "Sorry, no video device is available" << std::endl;
  return -1;
#endif

  // Initialize the display with the image I. Display and image are
  // now link together.
#ifdef VISP_HAVE_DISPLAY
  d->init(I);
#endif

  // Set the display background with image I content
  vpDisplay::display(I);

  // Flush the foreground and background display
  vpDisplay::flush(I);

  // Wait for keyboard event
  std::cout << "Waiting a keyboard event..." << std::endl;
  vpDisplay::getKeyboardEvent(I, true);
  std::cout << "A keyboard event was detected" << std::endl;

  // Non blocking keyboard event loop
  int cpt_event = 0;
  std::cout << "Enter a non blocking keyboard event detection loop..." << std::endl;
  do {
    bool event = vpDisplay::getKeyboardEvent(I, false);
    if (event) {
      std::cout << "A keyboard event was detected" << std::endl; cpt_event ++;
    }

    vpTime::wait(5); // wait 5 ms
  } while(cpt_event < 5);

#ifdef VISP_HAVE_DISPLAY
  delete d;
#endif
}

Parameters:

I

[in] : The displayed image.

blocking

[in] : Blocking behavior.

When set to true, this method waits until a key is pressed and then returns always true.
When set to false, returns true only if a key is pressed, otherwise returns false.

Returns:

true if a key was pressed. This is always the case if blocking is set to true .
false if no key was pressed. This can occur if blocking is set to false .

getKeyboardEvent(I: visp._visp.core.ImageRGBa, blocking: bool = true) -> tuple[bool, str]

Get a keyboard event.

Below you will find an example showing how to use this method.

#include <visp3/gui/vpDisplayD3D.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayGTK.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/gui/vpDisplayX.h>

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

int main()
{
  vpImage<vpRGBa> I(240, 320); // Create a black image

  vpDisplay *d;

#if defined(VISP_HAVE_X11)
  d = new vpDisplayX;
#elif defined(VISP_HAVE_GTK)
  d = new vpDisplayGTK;
#elif defined(VISP_HAVE_GDI)
  d = new vpDisplayGDI;
#elif defined(VISP_HAVE_D3D9)
  d = new vpDisplayD3D;
#elif defined(HAVE_OPENCV_HIGHGUI)
  d = new vpDisplayOpenCV;
#else
  std::cout << "Sorry, no video device is available" << std::endl;
  return -1;
#endif

  // Initialize the display with the image I. Display and image are
  // now link together.
#ifdef VISP_HAVE_DISPLAY
  d->init(I);
#endif

  // Set the display background with image I content
  vpDisplay::display(I);

  // Flush the foreground and background display
  vpDisplay::flush(I);

  // Wait for keyboard event
  std::cout << "Waiting a keyboard event..." << std::endl;
  vpDisplay::getKeyboardEvent(I, true);
  std::cout << "A keyboard event was detected" << std::endl;

  // Non blocking keyboard event loop
  int cpt_event = 0;
  std::string key;
  std::cout << "Enter a non blocking keyboard event detection loop..." << std::endl;
  do {
    bool event = vpDisplay::getKeyboardEvent(I, key, false);
    if (event) {
      std::cout << "Key detected: " << key << std::endl;
      cpt_event ++;
    }

    vpTime::wait(5); // wait 5 ms
  } while(cpt_event < 5);

#ifdef VISP_HAVE_DISPLAY
  delete d;
#endif
}

Parameters:

I

[in] : The displayed image.

blocking

[in] : Blocking behavior.

When set to true, this method waits until a key is pressed and then returns always true.
When set to false, returns true only if a key is pressed, otherwise returns false.

Returns:

A tuple containing:

true if a key was pressed. This is always the case if blocking is set to true .
false if no key was pressed. This can occur if blocking is set to false .
- key: [out]: If possible, an ISO Latin-1 character corresponding to the keyboard key.

static getPointerMotionEvent(*args, **kwargs)¶

Overloaded function.

getPointerMotionEvent(I: visp._visp.core.ImageGray, ip: visp._visp.core.ImagePoint) -> bool

Get the coordinates of the mouse pointer.

Parameters:

I: [in] : The displayed image.
ip: [out] : The coordinates of the mouse pointer.

Returns:

true if a pointer motion event was received, false otherwise.

getPointerMotionEvent(I: visp._visp.core.ImageRGBa, ip: visp._visp.core.ImagePoint) -> bool

Get the coordinates of the mouse pointer.

Parameters:

I: [in] : The displayed image.
ip: [out] : The coordinates of the mouse pointer.

Returns:

true if a pointer motion event was received, false otherwise.

static getPointerPosition(*args, **kwargs)¶

Overloaded function.

getPointerPosition(I: visp._visp.core.ImageGray, ip: visp._visp.core.ImagePoint) -> bool

Get the coordinates of the mouse pointer.

Parameters:

I: [in] : The displayed image.
ip: [out] : The coordinates of the mouse pointer.

Returns:

true.

getPointerPosition(I: visp._visp.core.ImageRGBa, ip: visp._visp.core.ImagePoint) -> bool

Get the coordinates of the mouse pointer.

Parameters:

I: [in] : The displayed image.
ip: [out] : The coordinates of the mouse pointer.

Returns:

true.

getScreenHeight(self) → int¶: Gets the screen vertical resolution in pixels.

getScreenSize(self, width: int, height: int) → tuple[int, int]¶

Gets screen resolution in pixels.

Returns:

A tuple containing:

width
height

getScreenWidth(self) → int¶: Gets the screen horizontal resolution in pixels.

getWidth(self) → int¶: Return the display width.

Note

See getHeight()

getWindowXPosition(self) → int¶: Return the position (along the horizontal axis) on the screen of the display window.

Note

See getWindowYPosition()

getWindowYPosition(self) → int¶: Return the position (along the vertical axis) on the screen of the display window.

Note

See getWindowXPosition()

init(*args, **kwargs)¶

Overloaded function.

init(self: visp._visp.gui.DisplayOpenCV, I: visp._visp.core.ImageGray, winx: int = -1, winy: int = -1, title: str = ) -> None

Initialize the display (size, position and title) of a gray level image.

Parameters:

I: Image to be displayed (not that image has to be initialized)
title: Window title.

init(self: visp._visp.gui.DisplayOpenCV, I: visp._visp.core.ImageRGBa, winx: int = -1, winy: int = -1, title: str = ) -> None

Initialize the display (size, position and title) of a color image in RGBa format.

Parameters:

I: Image to be displayed (not that image has to be initialized)
title: Window title.

init(self: visp._visp.gui.DisplayOpenCV, width: int, height: int, winx: int = -1, winy: int = -1, title: str = ) -> None

Initialize the display size, position and title.

Parameters:

title: Window title.

isInitialised(self) → bool¶

Check if the display has been initialised.

Returns:: True if the display has been initialised, otherwise False

static setBackground(*args, **kwargs)¶

Overloaded function.

setBackground(I: visp._visp.core.ImageGray, color: visp._visp.core.Color) -> None

Set the window background.

Parameters:

I: Image associated to the display window.
color: Background color.

setBackground(I: visp._visp.core.ImageRGBa, color: visp._visp.core.Color) -> None

Set the window background.

Parameters:

I: Image associated to the display window.
color: Background color.

setDownScalingFactor(*args, **kwargs)¶

Overloaded function.

setDownScalingFactor(self: visp._visp.core.Display, scale: int) -> None

Set the down scale factor applied to the image in order to reduce the display size.

Parameters:

scale: Scale factor applied to display a rescaled image.

setDownScalingFactor(self: visp._visp.core.Display, scaleType: visp._visp.core.Display.ScaleType) -> None

Set the down scaling factor either in auto mode or set manually.

This method has to be called before display initialization.

#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayX.h>

#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif

int main()
{
  vpImage<unsigned char> I(480, 640); // Black 640 by 480 image
#ifdef VISP_HAVE_X11
  vpDisplayX d;
#elif defined(VISP_HAVE_GDI)
  vpDisplayGDI d;
#endif
  // Display in a 160 by 120 windows size
  d.setDownScalingFactor(vpDisplay::SCALE_4);
  d.init(I);
  vpDisplay::display(I);
  vpDisplay::flush(I);
  vpDisplay::getClick(I); // wait for a click to quit
}

static setFont(*args, **kwargs)¶

Overloaded function.

setFont(I: visp._visp.core.ImageGray, font: str) -> None

Set the font of a text printed in the display overlay. To print a text you may use displayText() .

Note

Under UNIX, the available fonts are given by the “xlsfonts” binary. To choose a font you can also use the “xfontsel” binary.

Note

See displayText()

Parameters:

I: Image associated to the display window.

setFont(I: visp._visp.core.ImageRGBa, font: str) -> None

Set the font of a text printed in the display overlay. To print a text you may use displayText() .

Note

Under UNIX, the available fonts are given by the “xlsfonts” binary. To choose a font you can also use the “xfontsel” binary.

Note

See displayText()

Parameters:

I: Image associated to the display window.

static setTitle(*args, **kwargs)¶

Overloaded function.

setTitle(I: visp._visp.core.ImageGray, windowtitle: str) -> None

Set the windows title.

Note

This functionality is not implemented when vpDisplayOpenCV is used.

Parameters:

I: Image associated to the display window.
windowtitle: Window title.

setTitle(I: visp._visp.core.ImageRGBa, windowtitle: str) -> None

Set the windows title.

Note

This functionality is not implemented when vpDisplayOpenCV is used.

Parameters:

I: Image associated to the display window.
windowtitle: Window title.

static setWindowPosition(*args, **kwargs)¶

Overloaded function.

setWindowPosition(I: visp._visp.core.ImageGray, winx: int, winy: int) -> None

Set the window position in the screen.

Parameters:

I: Image associated to the display window.
winx: Position of the upper-left window’s border in the screen.
winy: Position of the upper-left window’s border in the screen.

setWindowPosition(I: visp._visp.core.ImageRGBa, winx: int, winy: int) -> None

Set the window position in the screen.

Parameters:

I: Image associated to the display window.
winx: Position of the upper-left window’s border in the screen.
winy: Position of the upper-left window’s border in the screen.