Abstract: An adaptive watermark algorithm in wavelet domain is proposed and the hamming code is used to correct the wrong code. The whole process is based on integer wavelet transform, coding the significant coefficients which have un-scanned in intermediate frequency sub-band, and adaptively quantizing wavelet coefficients. The watermark is embedded in the perceptually important coefficients. The watermark can be detected without resorting to the original image. Experimental results show that the algorithm proposed has the characteristics of strong adaptability, fast implementation, better invisibility and strong robustness against attack such as JPEG compression, filter, noise addition and cropping.

Key words: computer application, integer wavelet transform, EZW, error correction code, blind watermark