A wavelet-based method of zero-watermark

In this paper, a wavelet-based digital image watermarking algorithm is putforward, advantage of the zero-watermark. In proposed algorithm, the key is generated by XOR operation.This algorithm has very srong robustness, because of the pixel point are hardly changed. At the same time it has very strong invisibility because it dose not modify the data of the original image. Experiments show that a better robustness to the image processing such as JPEG compression, noise adding and smoothing filtering can be achieved. Meanwhile, embedding infomation in a large amount, the number of data bits reaches to a quarter that of the original image pixels. What´s more, it can ascertain the position of vicious attack exactly.