摘要： 设计一种新的基于方向小波和直方图平移的无损脆弱水印，用于嵌入图像完整性证明和无损恢复。根据图像的方向小波变换产生水印信息，可由用户密钥决定位置，利用直方图平移嵌入水印。认证端从接收的图像中根据密钥提取水印并产生新的水印，比较提取的水印和新的水印进而完成图像认证。该算法能在图像通过认证的情况下完全去除水印，获得无水印的原始图像。

关键词: 方向小波, 直方图平移, 无损水印

Abstract: This paper designs a new lossless fragile watermark based on directional wavelet and histogram shift. It can be used at integrity verification and lossless restoration. The watermark is generated by directional wavelet transformation and embedded by histogram shift and the embedding position can be decided by user’s key. By comparing the extracted watermark and the one computed from the reconstructed image, it can be decided if the image has been tampered or not. The watermark can be totally excluded and the original picture can be obtained if the picture passes the integrity verification.

Key words: directional wavelet, histogram shift, lossless watermark

中图分类号: 

• TP391