熊祥光.基于图像插值的大容量可逆水印算法[J].光电子激光,2016,27(6):646~654 |
基于图像插值的大容量可逆水印算法 |
High capacity reversible watermarking algorithm based on image interpolation |
投稿时间:2015-11-25 |
DOI: |
中文关键词: 可逆水印 图像插值 大容量 |
英文关键词:reversible watermarking image interpolation high capacity |
基金项目:国家自然科学基金(61309006)和贵州省教育厅自然科学基金(黔教合KY字[2015]434)资助 项目 (贵州师范大学 大数据与计算机科学学院,贵州 贵阳 550001) |
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中文摘要: |
提出一种基于图像插值的大容量可逆水印算法 。首先,对输入图像进行下采样 处理,利用某种图像插值方法对下采样生成的图像进行插值放大,得到待嵌入水印信号的载 体图像;然后,对载体 图像进行分块,得到每一分块4个基准像素的最大值和最小值,之后计算每一个非基准像素 分别与最大值和最小值 差值的绝对值,根据自适应选定的差值,计算每一个非基准像素能嵌入的最大水印位数;最 后,从待嵌入的水印信 号中将每一个非基准像素能嵌入的位数转换为十进制数,并将此数修改像素值,完成水印 信号的嵌入。大量的仿 真实验结果表明,本文算法不会出现像素值溢出现象,能实现可逆数据隐藏;与相似的基于 图像插值的可逆水印算法 相比,该算法的嵌入率(ER,embedding rate)更高;在相同 的ER条件下,本文算法的性能更好。 |
英文摘要: |
A new high capacity reversible watermarking algorithm based on image interpolati on is proposed.Firstly,the input image is down-sampling processed and an new cover image is generated by using interpolation method on down-sampling image is generated.Secondly,the cover image is divided into blocks,and the maximum and minimum of four reference pixe ls of each block are obtained,and then the differences of three non-reference pixel of each block are calculated.Depe nding on these differences,the number of bits which can be embedded in each non-reference pixel can be obtained.Finally,a bit str ing of each non-reference pixel is converted to corresponding decimal digit,and then the non-reference pixel is modified by this decimal digit to embed watermarking signal.A large number of experimental results show that the proposed algorithm does not appear pixel value overflow/underflow problem,and can achieve reversible data hiding.Compared with similar reversible watermarking algorithms,it has higher embedding capacity.Und er the same embedding rate (ER),it has also better performance. |
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