基于整数变换的图像可逆水印方法  

Reversible image watermarking method based on integer transform

作　　者：邱应强[1,2] 余轮[1] 

机构地区：[1]福州大学数字媒体研究院,福州360002 [2]华侨大学信息科学与工程学院,厦门361021

出　　处：《电子测量与仪器学报》2015年第1期92-98,共7页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(61372107;61302094);福建省自然科学基金计划(2014J01242;2014J01238)资助项目

摘　　要：为了缓解水印图像质量与嵌入水印量之间的矛盾,给出了一种新的基于整数变换的图像可逆水印方法。宿主图像块通过简单的整数变换扩展各像素点与图像块平均值之间的差值,变换后所有像素值最低有效位相同,产生的冗余数据可用于嵌入水印。方法可根据水印数据量大小选择整数变换引入失真较小的图像块用于水印嵌入,从而控制水印图像失真提高水印图像质量。实验结果表明该方法具有较好的水印图像质量和较大的水印嵌入容量,提取水印信息后原宿主图像可无失真恢复,达到了预期的效果。In order to alleviate the contradiction between the quality of watermarked image and embedding capacity, an integer transform based reversible image watermarking method was proposed. The cover image blocks were trans- formed by the simple integer transform to expend the differences between every pixel＇ s value and the average val- ue. After that the least significant bits of all pixels were the same, the produced redundancy data could be used for watermark embedding. According to the size of watermarking, the blocks with fewer distortions introduced by the integer transform were chosed for watermark embedding to control the distortion of embedded image. The experi- mental results show that the proposed method has better embedded image＇ s quality and larger embedding capacity, and after extracting the embedded watermarking, original cover image can be restored without any distortion, achieved the desired result.

关 键 词：可逆水印 整数变换 冗余数据 嵌入容量 

分 类 号：TP309[自动化与计算机技术—计算机系统结构] TN918[自动化与计算机技术—计算机科学与技术]