Image Acquisition - preview is fast, snapshot is slow?

Question

Brian 2013-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/59916-image-acquisition-preview-is-fast-snapshot-is-slow

编辑： Andraz Skoda 2016-6-8

Why is the snapping of frames so slow?

It seems that preview can be used with a callback to do real-time processing of images. However, snapping a frame, then calculating and displaying the result is very slow.

What is the best way to approach (quasi) real-time video processing?

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Answer 1

David Tarkowski 2013-1-28

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https://ww2.mathworks.cn/matlabcentral/answers/59916-image-acquisition-preview-is-fast-snapshot-is-slow#answer_72643

I think that this example might help with your issue: http://www.mathworks.com/help/imaq/examples/acquiring-a-single-image-in-a-loop.html.

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Andraz Skoda 2016-6-8

编辑：Andraz Skoda 2016-6-8

What happens with time needed for one frame if we store the frame in Matlab variable every time in a manualy trigger mode loop? Did anybody already tested it?

I'm working on application that also needs real-time snapshoting and every frame must be processed. Processing can also be done after all frames are captured. So we take for example 20 pictures (we must come under 5 seconds) and after this, process them.

Any suggestions, ideas or results of testing this kind of application with Matlab?

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