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You could grab the raw image via V4l2 directly, YUV format. But in the final stage you will need to convert it to RGB to get some meaningfull image or display it with some YUV player.
I did just that but failed to convert it to RGB, something is still missing.
I grabbed the raw image (YUV420P) and converted with ImageMagic, something like this:
display -size 800x600 -depth 8 -sampling-factor 4:2:0 -colorspace RGB -interlace plane raw_image.yuv
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