Display the different size of preview image from that of the captured images.
Hi, I have a question about webcam Image Capture and Preview.
The following is my simple code. This cpde captures images from the webcam every one second while displaying the preview image.
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cap1 = videoinput(‘winvideo’, ID_num1,’YUY2_1920x1080');
preview(cap1)
for 1 = 1:1000
frame1 = getsnapshot(cap1);
imwrite(frame1,’title’,’.jpg’);
pause(1)
end
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The preview image from my webcam is 1920x1080. Instead, I would like to display the preview image 320x240 while capturing the images from the webcam for 1920x1080.
Is there any suggestion or any way to solve my problem?
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What you basically want is a preview window that is smaller. You can achieve that by forcing the figure (and axes) to be a smaller dimension. Try something like this:
cap1 = videoinput('winvideo', ID_num1,'YUY2_1920x1080');
figure('Units', 'pixels', 'Position', [100 100 340 260]);
axes('Units', 'pixels', 'Position', [10 10 320 240]);
vidRes = get(cap1, 'VideoResolution');
nBands = get(cap1, 'NumberOfBands');
hImage = image( zeros(vidRes(2), vidRes(1), nBands) );
preview(cap1, hImage)for ii = 1:1000
frame1 = getsnapshot(cap1);
imwrite(frame1,sprintf('image%03d.jpg', ii));
pause(1)
end
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