| 基于共轭对称列率复数哈达玛变换的水印算法 |
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| 引用本文： | 张悦,舒华忠. 基于共轭对称列率复数哈达玛变换的水印算法[J]. 东南大学学报(自然科学版), 2011, 41(2): 312-316 |
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| 作者姓名： | 张悦 舒华忠 |
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| 作者单位： | 东南大学计算机科学与工程学院,南京,210096 |
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| 基金项目： | 国家自然科学基金资助项目，江苏省自然科学基金资助项目 |
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| 摘 要： | 为了提高水印的鲁棒性和计算效率,提出了一种基于共轭对称列率复数哈达玛变换的图像水印算法.该算法首先对载体图像分块并进行筛选,找到适合嵌入水印的块;在嵌入之前,根据方差将这些块分成纹理简单和纹理复杂2类,不同类的块使用不同的量化步长,以此来增强水印的鲁棒性;然后,利用量化的方法将经过置乱和扩频的二值水印嵌入到上述块的系数...
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| 关 键 词： | 共轭对称列率复数哈达玛变换 共轭对称 去同步攻击 仿射变换 检测阈值 |
Watermarking algorithm based on conjugate symmetric sequency-ordered complex hadamard transform |
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| Zhang Yue Shu Huazhong. Watermarking algorithm based on conjugate symmetric sequency-ordered complex hadamard transform[J]. Journal of Southeast University(Natural Science Edition), 2011, 41(2): 312-316 |
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| Authors: | Zhang Yue Shu Huazhong |
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| Affiliation: | Zhang Yue Shu Huazhong (School of Computer Science and Engineering,Southeast University,Nanjing 210096,China) |
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| Abstract: | To improve the robustness and computation efficiency of watermark,a watermarking algorithm based on conjugate symmetric sequency-ordered complex hadamard transform(CS-SCHT) is proposed.In this algorithm,the host image is decomposed into blocks which are selected to find suitable blocks for watermark.Before embedding,the selected blocks are classified into two classes,flat or textured,corresponding to different quantization step for better robustness.Finally,the binary meaningful watermark is embedded into t... |
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| Keywords: | conjugate symmetric sequency-ordered complex hadamard transform(CS-SCHT) conjugate symmetric de-synchronization attack affine transformation detection threshold |
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