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matlab实现LSB算法

于 2023-02-06 发布 文件大小:1.42 kB
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用Matlab实现LSB算法,包括信息隐藏和提取。 LSB(LeastSignificant Bits)算法:将秘密信息嵌入到载体图像像素值的最低有效位,也称最不显著位,改变这一位置对载体图像的品质影响最小。 LSB算法的基本原理: 对空域的LSB做替换,用来替换LSB的序列就是需要加入的水印信息、水印的数字摘要或者由水印生成的伪随机序列。由于水印信息嵌入的位置是LSB,为了满足水印的不可见性,允许嵌入的水印强度不可能太高。然而针对空域的各种处理,如游程编码前的预处理,会对不显著分量进行一定的压缩,所以LSB算法对这些操作很敏感。因此LSB算法最初是用于脆弱性水印的。

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