A Geometric Robust Watermarking Algorithm Based on DWT-DCT and Zernike Moments  

作　　者：CHEN Yu QU Fang HU Jianbin CHEN Zhong 

机构地区：[1]School of Electronics Engineering and Computer Science, Peking University/Key Laboratory of High Confidence Software Technologies of Ministry of Education, Beijing 100871, China

出　　处：《Wuhan University Journal of Natural Sciences》2008年第6期753-758,共6页武汉大学学报（自然科学英文版）

基　　金：Supported by the National Natural Science Foundation of China (60773163)

摘　　要：This paper proposed a novel multibits watermarking algorithm providing robustness against geometric attacks. The robustness is achieved from three aspects： （1） Choosing the inscribed disk of the host image as the Zernike moments computation domain and the square in the disk as the watermarking embedding domain. （2） Embedding the watermark in the cascade discrete wavelet transform-discrete cosine transform （DWT-DCT） domain by modulating the specified coefficient pair in each sub block. （3） Saving two selected Zernike moments of the original watermarked image to estimate and correct the geometric attacks before watermark extraction. Experimental results show that the proposed algorithm is robust to any angle of rotation attacks and wide range of scaling attacks, and as well, a variety of other attacks such as lossy compression, common signal processing.This paper proposed a novel multibits watermarking algorithm providing robustness against geometric attacks. The robustness is achieved from three aspects： （1） Choosing the inscribed disk of the host image as the Zernike moments computation domain and the square in the disk as the watermarking embedding domain. （2） Embedding the watermark in the cascade discrete wavelet transform-discrete cosine transform （DWT-DCT） domain by modulating the specified coefficient pair in each sub block. （3） Saving two selected Zernike moments of the original watermarked image to estimate and correct the geometric attacks before watermark extraction. Experimental results show that the proposed algorithm is robust to any angle of rotation attacks and wide range of scaling attacks, and as well, a variety of other attacks such as lossy compression, common signal processing.

关 键 词：Zernike moments discrete wavelet transform discrete cosine transform （DWT-DCT） WATERMARKING 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]