基于Haar小波变换的数字图像水印算法

算法基于Haar小波变换,把小波系数分块,并计算每个块的平均值.在一系列信号处理之后,这些块(尤其是大的块)的平均值不会有很大改变,否则,重构的图像就与原始图像有很大差别.通过对这些块的平均值进行量化来嵌入水印;提取时也依赖于相应块的平均值,所以不需要原始图像参与.算法对有损压缩、小波压缩、噪声、中值滤波和剪裁等操作有较好的鲁棒性.

Digital Image Watermaring Algorithm Base on Haar Wavelet Transform

The algorithm deals with the calculating method that wavelet modules are divided into block calculating the average of every one basis on Haar wavelet transform.Having been wiped with by a series of signals,the image of re-construction have great differences from the original one unless the average of the pieces(especially the big ones) can be changed greatly.By being quantized and implanted water mark,the average of the pieces are depended on when collected so as not to involve in the original image.The algorithm have perfect robust to the operation damaging compression,wavelet compression,noise,median filtering,cropping.