一种基于小波变换的图像自适应数字水印算法

提出了一种基于小波变换的图像自适应数字水印算法.首先对水印图像作置乱处理，然后对原始图像和置乱后的水印图像进行小波分解，并根据马尔可夫随机场对图像视觉效果建模，在该模型下求取每个低频系数的允许失真值，利用允许失真值调整水印嵌入位置和强度，从而达到自适应地嵌入水印的目的.最后，将所得的水印图像的低频系数嵌入选定的原始图像.

An Image adaptive Digital Watermarking Algorithm Based on DWT(Chinese)

An image-adaptive watermarking algorithm based on wavelet transform was proposed.At first, A digital image used as watermark was scrambled.Next,the original image and scrambled watermark image was decomposed by discrete wavelet transform(DWT),and the Markov random field model was used to ob- tain the allowable distorted parameter of every lowest approximate coefficient,embedding position;and in- tensity were adjusted according to the allowable distorted parameter.At last,the lowest approximate coeffi- cients of watermark was embedded into lowest approximate coefficients which were selected from original image.