关键词:零水印; 版权认证; 整数小波变换; Sobel特征提取; 鲁棒性
Zero-watermark copyright authentication scheme based onlifting wavelet and Sobel feature extraction with dilation
FAN Li, GAO Tie-gang, YANG Qun-ting
(College of Software, Nankai University, Tianjin 300071, China)
Abstract:In order to protect the ownership of digital multimedia works, proposed an improved zero-watermark copyright authentication scheme that is based upon Chen’s and Chang’s algorithms. In proposed scheme, used Haar integer wavelet transform which was based on lifting scheme and Sobel detection with dilation manipulation to extract image feature matrix in signing and to perform verification procedure of the zero-watermark, when selected the threshold properly. Comparing performance against many kinds of signal processing attacks with the other two algorithms, it is concluded that the proposed scheme, which can resist some attacks such as blurring, noising, lossy compression, sharpening, rotation and scaling, has good performance of robustness, and it is further verified by some simulation experiments. ......