vpDiskGrabber Class Reference

#include <visp3/io/vpDiskGrabber.h>

Inheritance diagram for vpDiskGrabber:

Public Member Functions
	vpDiskGrabber ()
	vpDiskGrabber (const std::string &genericName)
	vpDiskGrabber (const std::string &dir, const std::string &basename, long number, int step, unsigned int noz, const std::string &ext)
virtual	~vpDiskGrabber ()
void	acquire (vpImage< unsigned char > &I)
void	acquire (vpImage< vpRGBa > &I)
void	acquire (vpImage< float > &I)
void	acquire (vpImage< unsigned char > &I, long image_number)
void	acquire (vpImage< vpRGBa > &I, long image_number)
void	acquire (vpImage< float > &I, long image_number)
void	close ()
long	getImageNumber () const
std::string	getImageName () const
void	open (vpImage< unsigned char > &I)
void	open (vpImage< vpRGBa > &I)
void	open (vpImage< float > &I)
void	setBaseName (const std::string &name)
void	setDirectory (const std::string &dir)
void	setExtension (const std::string &ext)
void	setGenericName (const std::string &genericName)
void	setImageNumber (long number)
void	setNumberOfZero (unsigned int noz)
void	setStep (long step)
Inherited functionalities from vpFramegrabber
unsigned int	getHeight () const
unsigned int	getWidth () const

Public Attributes
bool	init

Protected Attributes
unsigned int	height
unsigned int	width

Detailed Description

Class to grab (ie. read) images from the disk.

Defined a virtual video device. "Grab" the images from the disk. Derived from the vpFrameGrabber class.

See also

vpFrameGrabber

Here an example of capture from the directory "/local/soft/ViSP/ViSP-images/cube". We want to acquire 10 images from the first named "image.0001.pgm" by steps of 2.

#include <visp3/core/vpImage.h>
#include <visp3/io/vpDiskGrabber.h>

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

  // Declare a framegrabber able to read a sequence of successive
  // images from the disk
  vpDiskGrabber g;

  // Set the path to the directory containing the sequence
  g.setDirectory("/local/soft/ViSP/ViSP-images/cube");
  // Set the image base name. The directory and the base name constitute
  // the constant part of the full filename
  g.setBaseName("image.");
  // Set the step between two images of the sequence
  g.setStep(2);
  // Set the number of digits to build the image number
  g.setNumberOfZero(4);
  // Set the first frame number of the sequence
  g.setImageNumber(1);
  // Set the image file extension
  g.setExtension("pgm");

  // Open the framegrabber by loading the first image of the sequence
  g.open(I) ;

  unsigned int cpt = 1;
  // this is the loop over the image sequence
  while(cpt ++ < 10)
  {
    // read the image and then increment the image counter so that the next
    // call to acquire(I) will get the next image
    g.acquire(I) ;
  }
}

Examples:

grabDisk.cpp, and manGrabDisk.cpp.

Definition at line 108 of file vpDiskGrabber.h.

Constructor & Destructor Documentation

vpDiskGrabber() [1/3]

vpDiskGrabber::vpDiskGrabber

(

)

Elementary constructor.

Definition at line 44 of file vpDiskGrabber.cpp.

References vpFrameGrabber::init.

vpDiskGrabber() [2/3]

vpDiskGrabber::vpDiskGrabber ( const std::string &  generic_name )

explicit

Constructor that takes a generic image sequence as input.

Definition at line 54 of file vpDiskGrabber.cpp.

References vpFrameGrabber::init.

vpDiskGrabber() [3/3]

vpDiskGrabber::vpDiskGrabber ( const std::string &  dir, const std::string &  basename, long  number, int  step, unsigned int  noz, const std::string &  ext  )

explicit

Constructor.

Parameters

dir	: Location of the image sequence.
basename	: Base name of each image.
number	: Initial image number.
step	: Increment between two images.
noz	: Number of zero to code the image number.
ext	: Extension of the image file.

Definition at line 72 of file vpDiskGrabber.cpp.

References vpFrameGrabber::init.

~vpDiskGrabber()

vpDiskGrabber::~vpDiskGrabber ( )

virtual

Destructor

In fact nothing to destroy...

Definition at line 320 of file vpDiskGrabber.cpp.

Member Function Documentation

acquire() [1/6]

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

virtual

Acquire an image reading the next image from the disk. After this call, the image number is incremented considering the step.

Parameters

I	: The image read from a file.

Implements vpFrameGrabber.

Examples:

grabDisk.cpp, and manGrabDisk.cpp.

Definition at line 144 of file vpDiskGrabber.cpp.

References vpImage< Type >::getHeight(), vpImage< Type >::getWidth(), vpFrameGrabber::height, vpImageIo::read(), and vpFrameGrabber::width.

Referenced by vpVideoReader::acquire(), vpVideoReader::getFrame(), and open().

acquire() [2/6]

void vpDiskGrabber::acquire ( vpImage< vpRGBa > &  I )

virtual

Acquire an image reading the next image from the disk. After this call, the image number is incremented considering the step.

Parameters

I	: The image read from a file.

Implements vpFrameGrabber.

Definition at line 172 of file vpDiskGrabber.cpp.

References vpImage< Type >::getHeight(), vpImage< Type >::getWidth(), vpFrameGrabber::height, vpImageIo::read(), and vpFrameGrabber::width.

acquire() [3/6]

void vpDiskGrabber::acquire

(

vpImage< float > &

I

)

Acquire an image reading the next pfm image from the disk. After this call, the image number is incremented considering the step.

Parameters

I	: The image read from a file.

Definition at line 200 of file vpDiskGrabber.cpp.

References vpImage< Type >::getHeight(), vpImage< Type >::getWidth(), vpFrameGrabber::height, vpImageIo::readPFM(), and vpFrameGrabber::width.

acquire() [4/6]

void vpDiskGrabber::acquire	(	vpImage< unsigned char > &	I,
		long	img_number
	)

Acquire an image reading the image with number img_number from the disk. After this call, the image number is incremented considering the step.

Parameters

I	: The image read from a file.
img_number	: The number of the desired image.

Definition at line 228 of file vpDiskGrabber.cpp.

References vpImage< Type >::getHeight(), vpImage< Type >::getWidth(), vpFrameGrabber::height, vpImageIo::read(), and vpFrameGrabber::width.

acquire() [5/6]

void vpDiskGrabber::acquire	(	vpImage< vpRGBa > &	I,
		long	img_number
	)

Acquire an image reading the image with number img_number from the disk. After this call, the image number is incremented considering the step.

Parameters

I	: The image read from a file.
img_number	: The number of the desired image.

Definition at line 256 of file vpDiskGrabber.cpp.

References vpImage< Type >::getHeight(), vpImage< Type >::getWidth(), vpFrameGrabber::height, vpImageIo::read(), and vpFrameGrabber::width.

acquire() [6/6]

void vpDiskGrabber::acquire	(	vpImage< float > &	I,
		long	img_number
	)

Acquire an image reading the pfm image with number img_number from the disk. After this call, the image number is incremented considering the step.

Parameters

I	: The image read from a file.
img_number	: The number of the desired image.

Definition at line 284 of file vpDiskGrabber.cpp.

References vpImage< Type >::getHeight(), vpImage< Type >::getWidth(), vpFrameGrabber::height, vpImageIo::readPFM(), and vpFrameGrabber::width.

close()

void vpDiskGrabber::close ( )

virtual

Not useful.

Here for compatibility issue with the vpFrameGrabber class.

Implements vpFrameGrabber.

Definition at line 310 of file vpDiskGrabber.cpp.

getHeight()

unsigned int vpFrameGrabber::getHeight ( ) const

inlineinherited

Return the number of rows in the image.

Examples:

AROgre.cpp, AROgreBasic.cpp, and testPylonGrabber.cpp.

Definition at line 114 of file vpFrameGrabber.h.

getImageName()

std::string vpDiskGrabber::getImageName ( ) const

inline

Return the name of the file in which the last frame was read.

Definition at line 148 of file vpDiskGrabber.h.

References vpFrameGrabber::open().

Referenced by vpVideoReader::acquire().

getImageNumber()

long vpDiskGrabber::getImageNumber ( ) const

inline

Return the current image number.

Definition at line 144 of file vpDiskGrabber.h.

Referenced by vpVideoReader::acquire(), vpVideoReader::getFrame(), and open().

getWidth()

unsigned int vpFrameGrabber::getWidth ( ) const

inlineinherited

Return the number of columns in the image.

Examples:

AROgre.cpp, AROgreBasic.cpp, and testPylonGrabber.cpp.

Definition at line 116 of file vpFrameGrabber.h.

open() [1/3]

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

virtual

Read the first image of the sequence. The image number is not incremented.

Implements vpFrameGrabber.

Examples:

grabDisk.cpp, and manGrabDisk.cpp.

Definition at line 84 of file vpDiskGrabber.cpp.

References acquire(), vpImage< Type >::getHeight(), getImageNumber(), vpImage< Type >::getWidth(), vpFrameGrabber::height, vpFrameGrabber::init, setImageNumber(), and vpFrameGrabber::width.

open() [2/3]

void vpDiskGrabber::open ( vpImage< vpRGBa > &  I )

virtual

Read the first image of the sequence. The image number is not incremented.

Implements vpFrameGrabber.

Definition at line 102 of file vpDiskGrabber.cpp.

References acquire(), vpImage< Type >::getHeight(), getImageNumber(), vpImage< Type >::getWidth(), vpFrameGrabber::height, vpFrameGrabber::init, setImageNumber(), and vpFrameGrabber::width.

open() [3/3]

void vpDiskGrabber::open

(

vpImage< float > &

I

)

Read the first image of the sequence. The image number is not incremented.

Definition at line 122 of file vpDiskGrabber.cpp.

References acquire(), vpImage< Type >::getHeight(), getImageNumber(), vpImage< Type >::getWidth(), vpFrameGrabber::height, vpFrameGrabber::init, setImageNumber(), and vpFrameGrabber::width.

setBaseName()

void vpDiskGrabber::setBaseName

(

const std::string &

name

)

Set the image base name.

Examples:

grabDisk.cpp, and manGrabDisk.cpp.

Definition at line 330 of file vpDiskGrabber.cpp.

setDirectory()

void vpDiskGrabber::setDirectory

(

const std::string &

dir

)

Set the main directory name (ie location of the image sequence)

Examples:

grabDisk.cpp, and manGrabDisk.cpp.

Definition at line 325 of file vpDiskGrabber.cpp.

setExtension()

void vpDiskGrabber::setExtension

(

const std::string &

ext

)

Set the image extension.

Examples:

grabDisk.cpp, and manGrabDisk.cpp.

Definition at line 335 of file vpDiskGrabber.cpp.

setGenericName()

void vpDiskGrabber::setGenericName

(

const std::string &

genericName

)

Definition at line 355 of file vpDiskGrabber.cpp.

Referenced by vpVideoReader::setFileName().

setImageNumber()

void vpDiskGrabber::setImageNumber

(

long

number

)

Set the number of the image to be read.

Examples:

grabDisk.cpp, and manGrabDisk.cpp.

Definition at line 340 of file vpDiskGrabber.cpp.

Referenced by vpVideoReader::acquire(), vpVideoReader::getFrame(), open(), and vpVideoReader::setFileName().

setNumberOfZero()

void vpDiskGrabber::setNumberOfZero

(

unsigned int

noz

)

Set the step between two images.

Examples:

grabDisk.cpp, and manGrabDisk.cpp.

Definition at line 353 of file vpDiskGrabber.cpp.

setStep()

void vpDiskGrabber::setStep

(

long

step

)

Set the step between two images.

Examples:

grabDisk.cpp, and manGrabDisk.cpp.

Definition at line 349 of file vpDiskGrabber.cpp.

Referenced by vpVideoReader::acquire(), and vpVideoReader::setFileName().

Member Data Documentation

height

unsigned int vpFrameGrabber::height

protectedinherited

Number of rows in the image.

Definition at line 107 of file vpFrameGrabber.h.

Referenced by vpPylonGrabberGigE::acquire(), vpPylonGrabberUsb::acquire(), acquire(), vpFlyCaptureGrabber::acquire(), vpV4l2Grabber::acquire(), vp1394TwoGrabber::acquire(), vpV4l2Grabber::close(), vp1394TwoGrabber::dequeue(), vpVideoReader::getFrame(), vp1394TwoGrabber::getHeight(), open(), vpV4l2Grabber::open(), vp1394CMUGrabber::open(), vp1394CMUGrabber::selectCamera(), vpVideoReader::setFileName(), vp1394TwoGrabber::setFormat7ROI(), vp1394CMUGrabber::setVideoMode(), vp1394TwoGrabber::setVideoMode(), vp1394CMUGrabber::vp1394CMUGrabber(), and vp1394TwoGrabber::vp1394TwoGrabber().

init

bool vpFrameGrabber::init

inherited

Set to true if the frame grabber has been initialized.

Definition at line 104 of file vpFrameGrabber.h.

Referenced by vpV4l2Grabber::acquire(), vp1394CMUGrabber::close(), vp1394TwoGrabber::close(), vpPylonGrabberGigE::connect(), vpPylonGrabberUsb::connect(), vpFlyCaptureGrabber::connect(), vpPylonGrabberUsb::disconnect(), vpPylonGrabberGigE::disconnect(), vpFlyCaptureGrabber::disconnect(), open(), vpV4l2Grabber::open(), vp1394TwoGrabber::resetBus(), vp1394CMUGrabber::selectCamera(), vp1394TwoGrabber::setFormat7ROI(), vpPylonGrabberUsb::startCapture(), vpPylonGrabberGigE::startCapture(), vpFlyCaptureGrabber::startCapture(), vpPylonGrabberGigE::stopCapture(), vpPylonGrabberUsb::stopCapture(), vpFlyCaptureGrabber::stopCapture(), vp1394CMUGrabber::vp1394CMUGrabber(), vp1394TwoGrabber::vp1394TwoGrabber(), vpDiskGrabber(), and vpV4l2Grabber::vpV4l2Grabber().

width

unsigned int vpFrameGrabber::width

protectedinherited

Number of columns in the image.

Definition at line 108 of file vpFrameGrabber.h.

Referenced by vpPylonGrabberGigE::acquire(), vpPylonGrabberUsb::acquire(), acquire(), vpFlyCaptureGrabber::acquire(), vpV4l2Grabber::acquire(), vp1394TwoGrabber::acquire(), vpV4l2Grabber::close(), vp1394TwoGrabber::dequeue(), vpVideoReader::getFrame(), vp1394TwoGrabber::getWidth(), open(), vpV4l2Grabber::open(), vp1394CMUGrabber::open(), vp1394CMUGrabber::selectCamera(), vpVideoReader::setFileName(), vp1394TwoGrabber::setFormat7ROI(), vp1394CMUGrabber::setVideoMode(), vp1394TwoGrabber::setVideoMode(), vp1394CMUGrabber::vp1394CMUGrabber(), and vp1394TwoGrabber::vp1394TwoGrabber().