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[WM]: How to get a normal reconstructed image after watermarking in transform domain?
Hello,everyone!
Recently I met a problem. I decomposed an image into wavelet domain and modified (watermark) some coefficients. Then I
reconstructed it back to an Image. But I found that the pixel value no longer ranges from 0 to 255 and becomes float data,i.e.,
there are some pixels with value lower than 0 or higher than 255. After I projected the value of reconstructed image on to 0~255, I
couldn't get the same watermarked coefficients any more.
I want to know, how do you deal with this problem when you watermark transform coefficients?
Wish your apply. Thank you!
Zhang Chun-e
z_ce@163.com
2006-03-16
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