problem of color baseline JPEG decoding: I am developing...

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Question by Soma
Submitted on 5/20/2004
Related FAQ: JPEG image compression FAQ, part 1/2
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problem of color baseline JPEG decoding: I am developing steganalysis software for JPEG images - As the data is hidden in DCT formats, I am bound to extract the DCT coefficients from a standard JPEG and statistically check them. Here I am facing the problem while extracting the DCT components of a Color baseline JPEG - I know that the information is in YCbCr form and the 3 components are interleaved - but from the raw data I am still unable to map the pixel-by-pixel DCT coefficients. Can anybody help me in this regard?

Answer by Ahmed Amr
Submitted on 7/2/2005
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Well man, there are three baseline DCT based JPEG modes, progressive and herarical and so on... I recommend u see the ITU CCITT document for reference... i am having troubles too man have u seen something like FF 00 in the image data?? is it a marker or what?? Anyways... Good luck Ahmedooka

Answer by ben
Submitted on 11/5/2005
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I am looking for the same idea. Let me know if you get any hints.

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