关键词:数字水印; 小波变换; 人类视觉系统
Research of image-adaptive watermarking algorithm
based on wavelet transform
LIU Tao1,2, XIAO Han2,3
(1.College of Information Engineering, Zhengzhou University, Zhengzhou 450001, China; 2.Dept of Information Technology, Zhengzhou Teachers College, Zhengzhou 450044, China; 3.School of Remote Sensing & Information Engineering, Wuhan University, Wuhan 430079, China)
Abstract:This paper proposed an image-adaptive watermarking algorithm based on wavelet transform. At first, scrambled a digital image used as watermark.Next,decomposed the original image by discrete wavelet transform,and in accordance with the characteristics of human visual system, wavelet decomposition in the low-frequency domain, used methods which average of adjacent domain instead of single wavelet decomposition coefficients to estimate and quantitative,adaptively embedded watermarking in wavelet coefficients of low-frequency domain. At last, the simulation experimental results show that the algorithm for a variety of conventional image processing has good robustness, compare with algorithm of Shao Ya-fei,et al,it has better coordination in watermarking capacity, invisibility, robustness. ......