How can I obtain raw data from a CVImageBuffer object

Question

I'm trying to use cocoa to grab images from a webcam. I'm able to get the image in RGBA format using the QTKit and the didOutputVideoFrame delegate call, and converting the CVImageBuffer to a CIImage and then to a NSBitmapImageRep.

I know my camera grabs natively in YUV, what I want is to get the YUV data directly from the CVImageBuffer, and proccess the YUV frame before displaying it.

My question is: How can I get the YUV data from the CVImageBuffer?

thanks.

score 1 · Answer 1 · answered May 14 '10 at 22:19

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You might be able to create a CIImage from the buffer using +[CIImage imageWithCVBuffer:] and then render that CIImage into a CGBitmapContext of the desired pixel format.

Note, I have not tested this solution.

answered May 14 '10 at 22:19

Barry Wark

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CIImage can grab the CVBuffer directly. Doesn't even require locking the base address – Cameron Lowell Palmer Jan 11 '15 at 14:54
@Barry Wark any advice? http://stackoverflow.com/questions/37611593/how-to-create-cvpixelbufferref-with-nv12-data – Grey Jun 07 '16 at 12:30

score 1 · Answer 2 · edited May 23 '17 at 11:47

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I asked what I thought was a different question, but it turned out to have the same answer as this one: raw data from CVImageBuffer without rendering?

edited May 23 '17 at 11:47

Community

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answered Apr 13 '11 at 00:31

jab

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How can I obtain raw data from a CVImageBuffer object

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