[WM]: Re: failure notice

["yana cahyana" <cahyanyana@gmail.com>]

 Dear milister,

I'm a graduated student from Indonesia. Currently I'm doing my research
based on paper "Secure DCT-SVD domain image watermarking: Embedding
data in all frequency". The algorithm appears well with gray-scale
image.

However,  when the algorithm is expanded to colour image, it didn't give a good
result.

The algorithm embed watermark into four quadrant, the first contains lower
frecuency and so on until high frequency. When it comes to the colour image,
the watermark retrieved from quadrant in middle and high frecuency have a
distort colour, sometimes it comes with all black.

Please help me, is it because of the DCT I used? What is the characteristic
of DCT in colour image? Thank you very much for your help.


 Sincerely yours,


 yana


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