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Extract black and white image from android camera's NV21 format

Asked 2011-03-11T11:36:18.950
32

I have done some google-ing around and couldn't find enough information about this format. It is the default format for camera preview. Can anyone suggest good sources of information about it and how to extract data from a photo/preview image with that format? To be more specific, I need the black and white image extracted.

EDIT: Seems like that format is also called YCbCr 420 Semi Planar

android android-camera rgb format-conversion
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NV21 is basically YUV420 but instead of planar format where Y, U and V have independent planes, NV21 has 1 plane for Luma and 2nd plane for Chroma. The format looks like

YYYYYYYYYYYYYYYYYYYYYYYYYYYYY YYYYYYYYYYYYYYYYYYYYYYYYYYYYY . . . .

VUVUVUVUVUVUVUVUVUVUVUVUVUVUVU VUVUVUVUVUVUVUVUVUVUVUVUVUVUVU . . . . .

answered 2012-06-20T18:53:40.187

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