image processing - Record screen in real time using MATLAB? -

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i using optical microscope , camera record videos post-processed in matlab.

real time acquisition , pixel statistics extremely helpful, because of looking @ absorbs little light (i using transmission mode). example blank (background) sample give me an average pixel value across 512x512 ccd array of 144 (grayscale). actual sample might have average value of 140 or so. subtle shift in pixel intensity useful in helping me focus microscope.

unfortunately, camera setup not supported matlab, cannot use image acquisition toolbox real time. wondering, there way 'fake' real time image acquisition selecting rectangle of current desktop (the rectangle video output of microscopes camera), matlab record in real time?

thanks


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