Image Acquisition - preview is fast, snapshot is slow?

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?

Answer 1

[David Tarkowski]

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.

[Andraz Skoda]

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?