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.
出处
《电子测量与仪器学报》
CSCD
北大核心
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
关键词
可逆水印
整数变换
冗余数据
嵌入容量
reversible watermarking
integer transform
redundancy data
embedding capacity
作者简介
邱应强，1981年出生，2006年于中国科学技术大学获得硕士学位，现为福州大学博士生、华侨大学讲师。目前主要研究方向为图像处理、信息隐藏以及数字水印等。E-mail：yqqiu@hqu．edu．cn
