基于群演算的小波域数字水印嵌入算法  

Watermarking Authentication Method Based on Group Operation

作　　者：姜峰[1] 姚鸿勋[1] 高文[1] 

机构地区：[1]哈尔滨工业大学计算机科学与技术学院,哈尔滨150001

出　　处：《计算机工程与应用》2004年第33期83-85,共3页Computer Engineering and Applications

摘　　要：提出了一种基于群演算的小波域数字水印嵌入方法。将数字图像小波分解后的中频系数分块,从而规定不同的状态,并用群及群运算规范状态集合及状态转移函数。该算法有效地利用了低频信息,将水印信息与低频信息进行运算后把结果以置换的方式嵌入中频。该算法具有很好的性能:水印的隐藏效果好,凭人眼无法看出与原图像的差别;隐藏的水印信息有一定的保密性;检测水印时不需要原图像;水印信号对数字图像信号的直方图均衡化、平滑、锐化等操作有较强的抗攻击性。This paper proposes a watermarking method for digital images with the spatial frequency features of wavelet transform based on group operation.Divide the middle frequency coefficients in to blocks after the wavelet decomposition of original image,thus stipulate different states.Then use group and a group of operation to standardize state set and state shift function.Low frequency coefficients are used effectively in this method.After the operation of Low frequency coefficient and watermark information,the result is embedded in the middle frequency by way of replacement.This algorithm has good performance:Watermark embedded in the image is unperceivable;The hidden watermark information has certain privacy;Do not need the original image when detect the watermark;Better robustness against general operation of digital image.

关 键 词：数字水印 数据隐藏 DWT 群演算 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]