基于小波变换及亮度分量的多功能数字水印算法  

A Meaningful Watermark of Multipurpose for Color Image

作　　者：刘伟[1] 王娟[1] LIU Wei;WANG juan(Department of Computer,Laiwu Vocational and Technical College,Laiwu 271100,Shandong,China)

机构地区：[1]莱芜职业技术学院,山东莱芜271100

出　　处：《长江信息通信》2023年第8期69-72,共4页Changjiang Information & Communications

基　　金：莱芜职业技术学院横向课题(编号:2023hxky62)。

摘　　要：研究改进彩色图像多功能水印构造算法。针对传统多功能水印算法构造出的健壮水印与脆弱水印容易相互影响,且多功能水印大多为无意义水印的现状,提出了一种新的有意义的彩色图像多功能水印算法。将彩色图像的Y分量图像分块,选取与分块个数具有相同像素点数的二值图像作为水印信息,将每个像素点的值重复嵌入到彩色图像Y分量对应各分块经小波变换后的四个子带中。通过正确提取LL子带中的水印信息实现版权证明功能,通过比较原二值水印图像与从四个子带中分别提取出的水印图像,实现图像内容完整性证明。实验结果证明,该多功能水印对噪声、JPEG压缩、滤波具有良好的稳健性;具有较高的图像篡改检测率,准确的篡改定位能力,且水印提取为盲提取。Research on watermark of multipupose for color image.Traditional algorithm of mulitifunctional watermark had such defect that robust watermark also affected the funciton of fragile watermark,and the watermark had'nt real meaning.So,a new meaningful watermark of multipurpose algorithm for color image copyright and integrity authentication was proposed.Firstly,we divided the Y component of color image into some blocks,and selected binary image as the watermarking image which the number of pixels were equal to the number of blocks.Secondly,we embedded the value of every pixel into the four subbands'coefficients of corresponding block repeated.We could prove the copyright of color image through extracting the watermarking image from LL subband,and prove integrity authentication of color image through comparing the original watermarking image to those who were extracted from LL、LH、HL、HH subbands.Experimental resultsshowed thatourmultipurposewatermark could resist adding noise,JPEG compression,filtering etc effectively,and had high detection rate for color image integrity auth-entication and could exactly locate the tampering part also.In addition,the watermark information could be extracted without original image.

关 键 词：整数小波变换 亮度分量 多功能水印 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]