Displaying figures in a while Loop

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Ryan
Ryan 2015-10-19
回答： Walter Roberson 2015-10-20
Hi everybody,
I'm trying to run a while loop only when I'm receiving video from a webcam, and then stop the while loop when I manually 'x' out of the figure of the video feed. The way I'm currently doing it I always get an error when exit out of the video figure, and I've only figured out how to do it for a specified amount of time. Please help..
My current code is like this:
Video = videoinput('winvideo',2);
set(Video,'FramesPerTrigger',Inf);
set(Video,'ReturnedColorspace','grayscale');
start(Video)
while(Video.FramesAcquired <= Inf)
data = getsnapshot(Video)
imshow(data)
%AND SO ON........

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回答（1 个）

Walter Roberson
Walter Roberson 2015-10-20
Video = videoinput('winvideo',2);
set(Video,'FramesPerTrigger',Inf);
set(Video,'ReturnedColorspace','grayscale');
start(Video)
imhand = imshow(zeros(2,2)); %establish an image object
while(Video.FramesAcquired <= Inf)
data = getsnapshot(Video)
if ~isgraphics(imhand); break; end %image gone, user must have deleted it
set(imhand, 'CData', data);
end
stop(Video);
If you are using R2014a or earlier, replace isgraphics() with ishandle()

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