基于提升小波变换的真彩水印嵌入算法

A Color Watermarking Algorithm Based on Lifting DWT

提出了一种针对真彩图像的小波域数字水印算法。该算法嵌入的水印不再是二值或者灰度图像,而是一幅包含更多信息量的真彩图像。根据载体及水印的数据量自适应地计算域值来选择水印的最佳嵌入位置。采用提升方案的小波变换解决了真彩图像小波系数重构时能量损失的问题。实验表明该算法能够有效地抵抗有损压缩、低通滤波、加噪处理及图像剪切等攻击处理,具有较强的稳健性。

An digital watermarking algorithm for color images based on binary image nor a gray image ,but a color image which includes more DWT is presented .The watermark in this paper is neither a information . The best areas where the watermark will be era- bedded are chose based on the threshold, which is calculated adaptively by the data of carrier and watermark. The problem of energy loss is solved by lifting scheme DWT. Experimental results show that the algorithm is robust for attacks such as lossy compression , low pass filtering, noise adding ,cutting and so on.