Which is the fastest way to display gray scale images (480 by 640) ?
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I am developing a motion tracking turret using a webcam. Presently the code works at 10 fps.
I'm using imshow to display images. But only the last image shows up, after the program is terminated. If i use pause(0.5) the images are displayed, but this messes up the frame rate.
Any solutions?
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Accepted Answer
Image Analyst
on 20 Nov 2012
You have to get the handle to the image in your axes, and then assign your webcam snapshot to the CData property (I think that's what it's called). This will be faster than imshow.
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Image Analyst
on 20 Nov 2012
Sometimes with cameras you do need a pause. I've tried to grab stuff with getsnapshot() and view it right away and sometimes the frame seems like it has weird double images or other strange artifacts, so I have code like this:
handleToImageInAxes = image( zeros([videoRes(2), videoRes(1), numberOfBands], 'uint8') );
preview(vidobj, handleToImageInAxes);
% Set up camera parameters.
src= getselectedsource(vidobj);
previewMode = 1;
src.Flipping = 2;
src.Gain=cameraSettings(previewMode).gain;
src.Exposure = cameraSettings(previewMode).exp;
% Need to pause 4 frame times to get rid of double image.
pause(2.1);
% Snap picture from camera.
snappedImage = getsnapshot(vidobj); % This works.
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