FrameGrabberV4lGrey Class Reference

#include <frame_grabber_v4l.h>

Inheritance diagram for FrameGrabberV4lGrey:

Detailed Description

This class provides an interface with a v4l camera on a linux system. I have not attempted at all to provide cross-compatibility with linux and windows and indeed some difficult questions are raised when hardware issues become involved.

under development

Author:: Brendan McCane

Definition at line 38 of file frame_grabber_v4l.h.


Public Types
typedef vxl_byte	ImageContents
typedef vil1_memory_image_of< ImageContents >	ImageGrey
Public Member Functions
	FrameGrabberV4lGrey (int width_=384, int height_=288, bool debug=false, char *devname="/dev/video0")
	constructor.
virtual	~FrameGrabberV4lGrey ()
	destructor.
vil1_memory_image *	get_current_frame ()
void	acquire_frame_synch ()
	acquire_frame_synch.
void	acquire_frame_asynch ()
	acquire_frame_asynch.
vil1_memory_image *	get_current_and_acquire ()
	get_current_and_acquire.
Private Member Functions
void	flip_current ()
	flip the current frame around a horizontal axis.
Private Attributes
ImageContents *	contents [2]
ImageGrey *	im [2]
int	current
AsyncIO *	aio
int	width
int	height
int	fd
bool	debug

Member Typedef Documentation

typedef vxl_byte FrameGrabberV4lGrey::ImageContents

Definition at line 41 of file frame_grabber_v4l.h.

typedef vil1_memory_image_of< ImageContents > FrameGrabberV4lGrey::ImageGrey

Definition at line 42 of file frame_grabber_v4l.h.

Constructor & Destructor Documentation

FrameGrabberV4lGrey::FrameGrabberV4lGrey	(	int	width_ = `384`,
		int	height_ = `288`,
		bool	debug_ = `false`,
		char *	devname = `"/dev/video0"`
	)

constructor.

Parameters:

	int	width: the width of the image (default 384)
	int	height: the height of the image (default 288)
	char	*devname: the name of the device (default /dev/video0

Under Development

Author:: Brendan McCane oul/oufgl

Definition at line 24 of file frame_grabber_v4l.cxx.

FrameGrabberV4lGrey::~FrameGrabberV4lGrey ( ) [virtual]

destructor.

.status Under Development .author Brendan McCane .library oul/oufgl

Definition at line 110 of file frame_grabber_v4l.cxx.

Member Function Documentation

vil1_memory_image* FrameGrabberV4lGrey::get_current_frame ( ) [inline, virtual]

Implements FrameGrabber.

Definition at line 48 of file frame_grabber_v4l.h.

void FrameGrabberV4lGrey::acquire_frame_synch ( ) [virtual]

acquire_frame_synch.

acquire a new frame synchronously (ie don't return until completed) You probably shouldn't mix asynch and synchronous calls as this tends to screw up the notion of the current frame.

.status Under Development .author Brendan McCane .library oul/oufgl

Implements FrameGrabber.

Definition at line 130 of file frame_grabber_v4l.cxx.

void FrameGrabberV4lGrey::acquire_frame_asynch ( ) [virtual]

acquire_frame_asynch.

acquire a new frame asynchronously (ie start acquiring and return immediately )

actually the asynch bit is currently not working. So at the moment it is actually acquiring synchronously.

.status Under Development .author Brendan McCane .library oul/oufgl

Implements FrameGrabber.

Definition at line 166 of file frame_grabber_v4l.cxx.

vil1_memory_image * FrameGrabberV4lGrey::get_current_and_acquire ( ) [virtual]

get_current_and_acquire.