Re: [WM]: SVD based watermarking.

[Siamak Yousefi <syousefy@yahoo.com>]

Dear Dyah,

You can embedd the watermark into matrix S. For example you can change the dimention of your watermark equal to your image matrix
and then use the following simple formula: [U, S, V]= svd(A), that A is your original image. Then S1= S+a*W.  that "a" is a
weighting factor. Now you can apply SVD again on S1, or [U_w, S_w, V_w]= svd(S1); A_w= U*S_w*V. In this way, you embed the
watermark. The maximum capacity of the image is dependent on the quality that you expect after watermark embedding. So, more quality
is proportional to lower capacity. For embedding the watermark smaller than original image, you can increase the size of watermark
by appending some zeros to it. Please note that you can use other methods for embedding. The above is a simlpe example, however, you
can use your mentioned method.

Regards,
Siamak


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