| 引用本文: | 于明伟.一种基于Contourlet-DFT的加密全息水印技术[J].包装工程,2016,37(1):142-146. |
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| 一种基于Contourlet-DFT的加密全息水印技术 |
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于明伟
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重庆商务职业学院，重庆 401331
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| 摘要: |
| 目的 提出一种新的、 适用性强的加密全息水印技术。方法 首先将载体图像进行一级Contourlet变换， 得到其低频子带图像； 其次将其低频子带图像进行离散傅里叶变换， 得到频域的幅度谱和相位；最后将加密全息水印嵌入到其高频部分的幅度谱中， 并对中心对称块相同的嵌入。结果 文中算法水印隐蔽性好， 重建水印图像视觉有意义； 算法鲁棒性强， 可以抵抗均值滤波、 中值滤波和高斯滤波， 对噪声、 JPEG压缩攻击和裁切攻击有很强的抵抗能力， 同时可以有效抵抗打印-扫描攻击。提取水印时， 不需要原始图像的参与， 属于盲水印算法。结论 该方法能够满足数字图像版权保护的需要。 |
| 关键词: 加密全息 Contourlet变换 离散傅里叶变换 全息水印 |
| DOI： |
| 分类号:TS853.6 |
| 基金项目:“十二五” 科技支撑计划 （2011BAK10B05， 2012BAD29B05）；质监总局公益项目 （2011IK260） |
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| Novel Encrypted Holographic Watermarking Algorithm Based on Contourlet-DFT |
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YU Ming-wei
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Chongqing Business Vocational College， Chongqing 401331， China
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| Abstract: |
| The aim of this study was to propose a novel encrypted holographic watermarking algorithm based on Contourlet-DFT. Firstly, the carrier image was decomposed by Contourlet transform. Then the low frequency subband was transformed to the frequency domain by Fourier transform. Finally, the encrypted holographic watermark was embedded into the amplitude of high spectral magnitude of the low frequency subband. And the same replacement was done in the central symmetrical block. Simulation results showed that the algorithm was of good invisible ability， and the reconstructed watermark can be identified. The proposed method with good robustness can well resist attacks such as low-pass filtering, noise, JPEG compression and cropping. The algorithm can survive print-scan attack as well. The carrier image was not needed during watermark extraction and the proposed algorithm was blind. The proposed watermarking algorithm can meet the need of copyright protection of digital images. |
| Key words: encrypted holography Contourlet transform DFT holographic watermarking |
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