基于小波变换的数字水印技术研究学位论文.doc

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5、raphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagr

6、aphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec基于小波变换的数字水印技术研究摘要：算法基于Haar小波变换，把小波系数分块

7、，并计算每个块的平均值。在一系列信号处理之后，这些块(尤其是大的块)的平均值不会有很大改变，否则，重构的图像就与原始图像有很大差别。通过对这些块的平均值进行量化来嵌入水印；提取时也依赖于相应块的平均值，所以不需要原始图像参与。算法对有损压缩、小波压缩、噪声、中值滤波和剪裁等操作有较好的鲁棒性。关键词：信息隐藏；数字水印；小波变换SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaa

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