本文提出了一種針對于灰度圖像的數(shù)字水印算法。算法是利用圖像小波分解后中高頻
系數(shù)的情況即細節(jié)的多少，使用1ogistic 二值混沌序列作為水印信號，加性修改小波分解后中頻系數(shù)對具有代表性的圖像進行水印數(shù)據(jù)的嵌入，在水印檢測和提取時，利用多個序列相關檢測的方法，提高了水印檢測時的正確率。
關鍵字: 數(shù)字水印；小波變換；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