| 一种广义差值扩展可逆水印算法 |
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| 引用本文： | 常志国,徐健.一种广义差值扩展可逆水印算法[J].现代电子技术,2012,35(20):84-86. |
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| 作者姓名： | 常志国 徐健 |
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| 作者单位： | 1. 长安大学信息工程学院,陕西西安,710064
2. 西安邮电大学通信与信息工程学院,陕西西安,710121 |
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| 摘 要： | 可逆水印中常用的位置图既占用空间,又消耗大量的计算成本进行压缩处理。本文针对此不足,提出了一种不使用位置图的大容量可逆水印算法。它将宿主图像分成2×2大小的像素块;计算各分块的近似平滑度值,该值在水印嵌入前后保持不变;将所有分块按平滑度值进行排序;根据水印信息量,依序选取适当数目的分块,利用广义差值扩展法嵌入水印。实验结果表明在同等PNSR下,该算法的水印嵌入量高于常见的一些算法。
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| 关 键 词： | 信息隐藏 可逆水印 可逆数据嵌入 广义差值扩展 |
Reversible watermarking algorithm with general difference expansion |
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| CHANG Zhi-guo
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XU Jian.Reversible watermarking algorithm with general difference expansion[J].Modern Electronic Technique,2012,35(20):84-86. |
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| Authors: | CHANG Zhi-guo XU Jian |
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| Affiliation: | 1.School of Information Engineering,Chang’an University,Xi’an 710064,China; 2.School of Communication and Information Engineering,Xi’an University of Posts & Telecommunications,Xi’an 710121,China) |
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| Abstract: | The location map,which is frequently used in reversible watermarking,has two disadvantages: the size of the compressed location map influences the effective payload dramatically,and the compression of location map consumes lots of computation.A reversible watermarking algorithm of high payload without location map is proposed.The host image is divided into 2×2 blocks,whose the smooth degree is computed,which is unchanged before and after watermark embedding.According to the smooth degree,all blocks are sorted.The watermark is embedded in the selected blocks with the general difference expansion.The experimental results show the proposed method can conceal more information than mangy existing methods at the same PNSR. |
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| Keywords: | information hiding reversible watermarking reversible data embedding general difference expansion |
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