计算机工程
計算機工程
계산궤공정
COMPUTER ENGINEERING
2009年
15期
153-155
,共3页
方向小波%直方图平移%无损水印
方嚮小波%直方圖平移%無損水印
방향소파%직방도평이%무손수인
directional wavelet%histogram shift%Iossless watermark
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.
設計一種新的基于方嚮小波和直方圖平移的無損脆弱水印,用于嵌入圖像完整性證明和無損恢複.根據圖像的方嚮小波變換產生水印信息,可由用戶密鑰決定位置,利用直方圖平移嵌入水印.認證耑從接收的圖像中根據密鑰提取水印併產生新的水印,比較提取的水印和新的水印進而完成圖像認證.該算法能在圖像通過認證的情況下完全去除水印,穫得無水印的原始圖像.
설계일충신적기우방향소파화직방도평이적무손취약수인,용우감입도상완정성증명화무손회복.근거도상적방향소파변환산생수인신식,가유용호밀약결정위치,이용직방도평이감입수인.인증단종접수적도상중근거밀약제취수인병산생신적수인,비교제취적수인화신적수인진이완성도상인증.해산법능재도상통과인증적정황하완전거제수인,획득무수인적원시도상.
This paper designs a new lossless fragile watermark based on directional wavelet and histogram shift. It can be used at integrity verification and Iossless 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.
