VideoCaptureDemo

Psychtoolbox › PsychDemos

Demonstrate simple use of built-in video capture engine.

VideoCaptureDemo([fullscreen=0][, fullsize=0][, roi=[0 0 640 480]][, depth][,deviceId=0])

VideoCaptureDemo initializes the first attached and supported camera on
your computer (e.g, the built-in iSight of Apple Macintosh computers),
then shows its video image in a Psychtoolbox window.

By default, a capture rate of 30 frames per second is requested, and the
timecode and interframe interval of each captured image is displayed in
the top-left corner of the display. A press of the ESCape key ends the
demo.

See also ImagingVideoCaptureDemo, VideoDelayloopMiniDemo and a few other
nice demos.

Optional parameters:

'fullscreen' If set to non-zero value, the image is displayed in a
fullscreen window, as usual, otherwise a normal GUI window is used.

'fullsize' If set to 1, the cameras image is scaled up to full screen
resolution, ie. so it fills the maximum amount of display area, but
preserving the original aspect ratio.

'roi' Selects a rectangular subregion of the camera for display. By
default, it selects a [0 0 640 480] rectangle, ie. the full are of a
camera with 640 x 480 pixels resolution. This parameter may need tweaking
for some cameras, as some drivers have bugs and don't work well with all
settings.

'deviceId' Device index of video capture device. Defaults to system default.