基于混沌和小波变换的彩色图像数字水印算法

Color Image Digital Watermarking Algorithm Based on Chaos and Wavelet Transform

彩色图像在实际生活中有重要的地位,且基于小波变换的水印算法引起越来越多研究者的关注,本文提出了一种基于混沌和离散小波变换的彩色图像数字水印算法,即把经过混沌置乱处理的彩色水印嵌入到原始彩色图像中.简要介绍了图像小波分解的相关理论,分析了水印嵌入位置,给出了二维Logistic混沌的定义及彩色水印置乱的具体步骤.重点阐述了水印嵌入和提取的算法、实验结果及攻击测试结果.

The color image has an important position in real life, and watermark algorithm based on wavelet transform has attracted more and more interest of the researchers, so this paper presents an color image digital watermark algorithm based on the chaos and discrete wavelet transform, the algorithm is that color watermark scrambled by 2-D Logistic chaos is embedded into original color image. The wavelet decomposition of images are introduced briefly in the paper, and the watermark embedded position is analyzed, The definition of 2-D Logistic chaos and the scrambled process of color watermark are explained. Then the watermark embedding and extracting algorithms, experimental results and attacks test are discussed in emphasis.