Can anyone please explain to me how to compute DCT? I'm finding it hard to understand it. 2D-DCTdct1 I attached the formulas the Discrete Cosine Transform (DCT) and it's Inverse-DCT.

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Read this:
http://en.wikipedia.org/wiki/Jpeg#Discrete_cosine_transform
I'll see if I can find some source code.

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I'm assuming you mean a visible stamp on the image. Yes, you should compress AFTER watermarking.

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I read something about compression. Should I compressed the image after i watermarked it. I'm basically goint to use DCT for image watermarking.

I'm assuming you mean a visible stamp on the image. Yes, you should compress AFTER watermarking.

No it's an invisible watermark

by which method we can embedded the original image with watermark image?

how to implement 2-d dct in xilinx?

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