介绍了一种基于logistic映射的混沌数字水印方案,运用离散余弦变换(DCT),在频域,将混沌序列嵌入到直流分量DC中,利用人类视觉系统(HVS)的掩蔽特性,该水印自适应地隐藏到图像中,保证了水印的不可见性,并且可以检测水印的存在与否.实验结果表明,对于常见的信号失真(加入椒盐噪声、中值滤波等)和几何失真(有损压缩、剪切等),该算法具有较好的稳健性.
The digital watermark images based on Logistic mapping are intruduced. DCT is used to embed confusional serial in DC. On account of HVS's conceal character, the watermark is self-adaptative to the image. So the invisibility of the watermark is guaranteed. In addition, the watermark can be checked. The experimental result suggests that the algorithmic stability is very good to the familiar signal distortion and geometrical distortion.
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