A Zero-Watermark schema based on direct wavelet transform

This paper brought a Zero-Watermark algorithm based on direct wavelet transform. It made use of chaos mapping, and embedded the zero watermark information into the most important part of the image, that made the algorithm have the best fidelity and be very robust. At the same time, this zero-watermark algorithm can product a ocular watermark content according to the watermark key, this character is better than other ordinary zero-watermarking algorithms. Through a lot of experiments, this algorithm is proved to be strongly robust and very safe.