基于小波域的自适应彩色图像盲水印算法

论文提出了一种小波域的自适应彩色图像盲水印算法,水印采用有意义二值图。将0/1水印值嵌入到图像三级小波分解后的细节子带系数中,嵌入方向由高分解层向低分解层进行。嵌入过程根据选定位置点的三个细节子带系数的间隔差异,采取不同的嵌入策略。水印提取不需原图,属于盲水印提取,提取水印亦是二值图,效果直观。作者通过大量的实验发现,算法在彩色图像的绿色空间中嵌入水印,提取效果最佳。

A Blind Adaptive Watermarking Algorithm Based on the Wavelet Domain

In this paper,we present an approach for still color image watermarking which is based on wavelet decomposition.The watermark is 2-bit image.We embed the 0/1 value into the coefficients of the 3-deposition detail bands from high scale level to low scale level.According to the interval of the 3 detail coefficients,we adopt two embedding solutions.In condition of big interval,we use mid-value quantization.In opposite condition,we use averagevalue quantization.The extract algorithm is blind.It need not the original image to extract the watermark.From many extraction tests,we find the embedding in green channel is the most efficient way to extract watermark.