一种基于矢量量化彩色图像的水印方法

给出了一种基于彩色图像矢量量化压缩域的码字索引上的水印嵌入算法.在对彩色图像进行矢量量化时,采用一套训练好的共享码本分别对彩色图像分离出的红、绿、蓝三色分量所对应的单色图像进行矢量量化编码,并同时在每n个彩色图像块中最多修改其中一个图像块的某一影响最小的单色图形块所对应索引的奇偶性,嵌入log2(n 1)比特的水印信息.该方法已在微型计算机上进行了实验,结果表明,图像水印的嵌入引起的失真较小,并且水印具有一定的鲁棒性.

A VQ-based watermarking method for color images

A watermarking algorithm based on codeword index of VQ-compressed domain for color images was presented.During the vector quantization of a color image,three monochrome images separated from the color image were segmented into blocks first,then each block was coded with the shared codebook generated in advance,meanwhile for every n color image block,by changing the index's parity of one monochrome image block of one color image block,log_2(n 1)bits of watermarking information were embedded.Experimental results show that the embedding of watermarking induces less distortion and that the watermarking has certain robustness.