How to embed matrix in watermarking?

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Andi Tarigan 2014-1-28

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评论： Andi Tarigan 2014-1-28

Hello,

How to embed the two pseudorandom sequences (Matrix with size 1024, 1), with factor gain alfa in the DCT transformed 4x4 blocks of the selected? Instead of embedding in all coefficients of the DCT block, it applied only to the mid-band DCT coefficients. If we donate X as the matrix of the mid-band (2x2) coefficients of the DCT transformed block, then embedding is done as equation:

X' = X + alfa * PN

Thankyou.

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Shivaputra Narke 2014-1-28

Can you explain the question in detail?

Andi Tarigan 2014-1-28

I have matrixs in 1 colomn ada 1024 row with random value (PN). Then I want to embed it use equation above, to many matrix with different value with size 4x4, so the total matrix is 256, but we must embed it just to midband that matrix, just middle matrix with size 2x2. Then, the value in middle matrix as X, then we replace that value with X' used above equation.

I am sorry if my English is bad. Or can I show my paper to you? :)

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