vpFrameGrabber Class Reference

#include <vpFrameGrabber.h>

Inheritance diagram for vpFrameGrabber:

Public Member Functions
unsigned int	getHeight () const
unsigned int	getWidth () const
virtual	~vpFrameGrabber ()
virtual void	open (vpImage< unsigned char > &I)=0
virtual void	open (vpImage< vpRGBa > &I)=0
virtual void	acquire (vpImage< unsigned char > &I)=0
virtual void	acquire (vpImage< vpRGBa > &I)=0
virtual void	close ()=0

Public Attributes
bool	init

Protected Attributes
unsigned int	height
unsigned int	width

Detailed Description

Base class for all video devices. It is designed to provide a front end to video sources.

This class should provide a virtual function that allows the acquisition of an image.

The example below shows how to use this class.

#include <visp/vpConfig.h>
#include <visp/vpImage.h>
#include <visp/vpImageIo.h>
#include <visp/vpV4l2Grabber.h>
#include <visp/vp1394TwoGrabber.h>

int main()
{
#if defined(VISP_HAVE_V4L2) || defined(VISP_HAVE_DC1394_2)
  vpImage<unsigned char> I;
  vpFrameGrabber *g; // Generic framegrabber

#if defined( VISP_HAVE_DC1394_2 )
  vp1394TwoGrabber *g_1394_2 = new vp1394TwoGrabber;
  // specific settings for firewire grabber based on libdc1394-2.x version
  g_1394_2->setVideoMode(vp1394TwoGrabber::vpVIDEO_MODE_320x240_YUV422);
  g_1394_2->setFramerate(vp1394TwoGrabber::vpFRAMERATE_30);
  g = g_1394_2;
#elif defined( VISP_HAVE_V4L2 )
  vpV4l2Grabber *g_v4l2 = new vpV4l2Grabber;
  // specific settings for Video For Linux Two grabber
  g_v4l2->setInput(2);    // Input 2 on the board
  g_v4l2->setFramerate(vpV4l2Grabber::framerate_50fps); // 50 fps
  g_v4l2->setWidth(384);  // Acquired images are 768 width
  g_v4l2->setHeight(288); // Acquired images are 576 height
  g_v4l2->setNBuffers(3); // 3 ring buffers to ensure real-time acquisition
  g = g_v4l2;
#endif

  g->open(I);                           // Open the framegrabber
  g->acquire(I);                        // Acquire an image
  vpImageIo::write(I, "image.pgm");  // Write image on the disk
#endif
}

Author

Eric Marchand (Eric..nosp@m.Marc.nosp@m.hand@.nosp@m.iris.nosp@m.a.fr), Irisa / Inria Rennes

Definition at line 108 of file vpFrameGrabber.h.

Constructor & Destructor Documentation

virtual vpFrameGrabber::~vpFrameGrabber ( )

inlinevirtual

Definition at line 124 of file vpFrameGrabber.h.

Member Function Documentation

virtual void vpFrameGrabber::acquire ( vpImage< unsigned char > &  I )

pure virtual

Implemented in vp1394TwoGrabber, vpV4l2Grabber, vpVideoReader, vp1394Grabber, vp1394CMUGrabber, vpDiskGrabber, vpOpenCVGrabber, and vpDirectShowGrabber.

virtual void vpFrameGrabber::acquire ( vpImage< vpRGBa > &  I )

pure virtual

Implemented in vp1394TwoGrabber, vpV4l2Grabber, vpVideoReader, vp1394Grabber, vp1394CMUGrabber, vpDiskGrabber, vpOpenCVGrabber, and vpDirectShowGrabber.

virtual void vpFrameGrabber::close ( )

pure virtual

This virtual function is used to de-allocate the memory used by a specific frame grabber

Implemented in vp1394TwoGrabber, vpV4l2Grabber, vpVideoReader, vp1394CMUGrabber, vp1394Grabber, vpDiskGrabber, vpOpenCVGrabber, and vpDirectShowGrabber.

unsigned int vpFrameGrabber::getHeight ( ) const

inline

Return the number of rows in the image.

Examples:

AROgre.cpp, AROgreBasic.cpp, HelloWorldOgre.cpp, and HelloWorldOgreAdvanced.cpp.

Definition at line 119 of file vpFrameGrabber.h.

Referenced by vp1394Grabber::acquire(), and vp1394Grabber::open().

unsigned int vpFrameGrabber::getWidth ( ) const

inline

Return the number of columns in the image.

Examples:

AROgre.cpp, AROgreBasic.cpp, HelloWorldOgre.cpp, and HelloWorldOgreAdvanced.cpp.

Definition at line 121 of file vpFrameGrabber.h.

Referenced by vp1394Grabber::acquire(), and vp1394Grabber::open().

virtual void vpFrameGrabber::open ( vpImage< unsigned char > &  I )

pure virtual

Implemented in vp1394TwoGrabber, vp1394CMUGrabber, vpVideoReader, vpV4l2Grabber, vp1394Grabber, vpDiskGrabber, vpOpenCVGrabber, and vpDirectShowGrabber.

virtual void vpFrameGrabber::open ( vpImage< vpRGBa > &  I )

pure virtual

Implemented in vp1394TwoGrabber, vp1394CMUGrabber, vpVideoReader, vpV4l2Grabber, vp1394Grabber, vpDiskGrabber, vpOpenCVGrabber, and vpDirectShowGrabber.

Member Data Documentation

unsigned int vpFrameGrabber::height

protected

Number of rows in the image.

Definition at line 113 of file vpFrameGrabber.h.

Referenced by vpDiskGrabber::acquire(), vpV4l2Grabber::acquire(), vp1394TwoGrabber::acquire(), vp1394TwoGrabber::dequeue(), vp1394Grabber::getHeight(), vp1394TwoGrabber::getHeight(), vpDiskGrabber::open(), vpV4l2Grabber::open(), vpVideoReader::open(), vp1394CMUGrabber::open(), vpOpenCVGrabber::setHeight(), vpV4l2Grabber::setHeight(), vp1394CMUGrabber::setVideoMode(), vp1394TwoGrabber::setVideoMode(), vp1394CMUGrabber::vp1394CMUGrabber(), vp1394TwoGrabber::vp1394TwoGrabber(), vpOpenCVGrabber::vpOpenCVGrabber(), and vpV4l2Grabber::vpV4l2Grabber().

bool vpFrameGrabber::init

Set to true if the frame grabber has been initialized.

Definition at line 111 of file vpFrameGrabber.h.

Referenced by vpOpenCVGrabber::acquire(), vp1394Grabber::acquire(), vpV4l2Grabber::acquire(), vpOpenCVGrabber::close(), vp1394CMUGrabber::close(), vp1394TwoGrabber::close(), vpOpenCVGrabber::open(), vpDiskGrabber::open(), vp1394Grabber::open(), vpV4l2Grabber::open(), vp1394TwoGrabber::resetBus(), vp1394CMUGrabber::vp1394CMUGrabber(), vp1394Grabber::vp1394Grabber(), vp1394TwoGrabber::vp1394TwoGrabber(), vpDiskGrabber::vpDiskGrabber(), vpOpenCVGrabber::vpOpenCVGrabber(), and vpV4l2Grabber::vpV4l2Grabber().

unsigned int vpFrameGrabber::width

protected

Number of columns in the image.

Definition at line 114 of file vpFrameGrabber.h.

Referenced by vpDiskGrabber::acquire(), vpV4l2Grabber::acquire(), vp1394TwoGrabber::acquire(), vp1394TwoGrabber::dequeue(), vp1394Grabber::getWidth(), vp1394TwoGrabber::getWidth(), vpDiskGrabber::open(), vpV4l2Grabber::open(), vpVideoReader::open(), vp1394CMUGrabber::open(), vp1394CMUGrabber::setVideoMode(), vp1394TwoGrabber::setVideoMode(), vpOpenCVGrabber::setWidth(), vpV4l2Grabber::setWidth(), vp1394CMUGrabber::vp1394CMUGrabber(), vp1394TwoGrabber::vp1394TwoGrabber(), vpOpenCVGrabber::vpOpenCVGrabber(), and vpV4l2Grabber::vpV4l2Grabber().