基于小波变换的图像自适应水印算法

Image-adaptive Watermarking Technique Based on DWT

根据人类视觉系统(HVS)特性和小波变换特性,提出了一种新的自适应水印算法.这种新的自适应水印算法可将小波变换后的图像的小波系数组成小波子块.根据人类视觉系统(HVS)特性,采用多参数对小波子块进行分类.根据分类结果并结合小波变换特性,将不同强度的水印幻方置乱后嵌入到不同的小波子块中.实验结果表明,该算法具有较好的鲁棒性和不可感知性.

A new image - adaptive watermarking algorithm has been proposed on the base of the features of human visual system （HVS） and the wavelet transform. The original image is decomposed by wavelet transformation. Then wavelet coefficients are organized in order to form wavelet blocks. They are classified into several dasses based on several parameters with the features of HVS. Watermark components with different strength are embedded into different wavelet blocks after the results of classification and the features of wavelet transform. The experimental results have shown that the proposed algorithm has good robustness and invisible nature.