Adaptive image watermarking algorithm based on biorthogonal wavelet transform

A new adaptive image watermark algorithm based wavelet transform is proposed in this paper. It can detect watermark without using the original image. The position where watermark is embedded is finded by utilizing the correlation between the neighbors of wavelet coefficient. The strength of watermark is obtained according to the edge. Thus a good balance between invisible and robust is achieved. Experimental result shows that this watermark algorithm is invisible and robust against some image processing operations, such as addiribe noise, filter, compression, incorporating attacks and so on.