一种混合的自嵌入双水印算法

A Hybird Self-embedding Bi-watermarking Algorithm

提出了一种基于小波变换的自嵌入的双水印算法。原始图像的次低位和最低位分别嵌入恢复水印和脆弱水印。原始图像的高6位进行小波变换,低频系数生成恢复水印,将其嵌入到图像的次低位。小容量信息嵌入到图像块本身的最低位,生成脆弱水印。本算法可以准确定位原始图像被篡改的位置,并能对内容被篡改的区域进行恢复。

Based on discrete wavelet transform,a new hybrid image authentication watermark obtained as a combination of a fragile and a robust watermark is presented.The high 6 bits of original image is discrete wavelet transform,then recovery watermark to be obtained from low-frequency wavelet coefficients to be quantized and chaoic scrambling is embedded into the Hypo-LSB of image.The small volume of information is embedded into LSB of original image.And from this authentication watermarking is generated.Experiments result shows that the proposed algorithm cannot only locate tampered blocks accurately,but also restore tampered content region.