基于小波域的自适应图象盲水印算法

文章提出了一种多尺度小波域的自适应盲水印算法,水印采用有意义二值图。将0/1水印值嵌入到图象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3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。经攻击实验证明,对图象噪声、剪切和压缩具有一定的鲁棒性,是一种可行的水印算法。

A Blind Adaptive Watermarking Algorithm Based on the Wavelet Domain

This paper presents an approach for still image watermarking which is based on wavelet decomposition.The watermark is 2-bit image.It embeds 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,it adopts two embedding solutions.In condition of big interval,it uses mid-value quantization.In opposite condition,it uses average-value quantization.The extract algorithm is blind.It needs no an original image to extract the watermark.The extracted watermark is also 2-bit image and it's visually effective.Through the attack experiments,the algorithm is robust against the attacks of noise,crop,compression and so on.