基于离散小波变换和混沌序列的水印算法

本文提出了一种针对于灰度图像的数字水印算法。算法是利用图像小波分解后中高频
系数的情况即细节的多少，使用1ogistic 二值混沌序列作为水印信号，加性修改小波分解后中频系数对具有代表性的图像进行水印数据的嵌入，在水印检测和提取时，利用多个序列相关检测的方法，提高了水印检测时的正确率。
关键字: 数字水印；小波变换；算法
Abstract: A watermarking algorithm based on discrete wavelet transform and chaotic sequence is proposed, with both of robustness and concealment taken into account. In this method, a bi-chaotic sequence generated from logistic is adopted as the watermark and the representative gray level images are adopted as the original image to be embedded in. Firstly the resolution wavelet decomposition is used towards the original image, and then the watermark data is embedded into the original image through modifying the intermediate frequency wavelet coefficients of original image a correlation detect of multi-sequence method is used in the according extracting procedure to enhance the right rate of watermark detecting even though the watermark is affected in the signal processing the method still can detect it.
Keywords: Digital Watermarking; Wavelet Transform; Algorithm