| 摘要: |
| 目的 提出改进的基于快速响应矩阵码( QR 码) 的数字全息水印。 方法 利用加密傅里叶全息技术对 QR 码进行加密并生成全息图,在标准颜色空间下,抽取彩色载体图像的 L 分量进行二级小波分解,将全息图嵌入到其分解后的低频系数中,以实现水印信息的隐藏。 为提高 QR 码译码成功率,对提取后的水印进行十字型中值滤波处理。 结论 QR 码水印能够保存完整的水印信息,比普通图像水印鲁棒性强,且相比于其他基于 QR 码的数字全息水印算法具有更强的鲁棒性。 |
| 关键词: QR 码 傅里叶全息 离散小波变换 中值滤波 |
| DOI： |
| 分类号:TP309;TS853+.6 |
| 基金项目:上海市研究生创新基金项目( JWCXSL1202) |
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| Improved QR Code-based Digital Holographic Watermark |
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WANG Zi-yu, SUN Liu-jie
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University of Shanghai for Science and Technology, Shanghai 200093, China
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| Abstract: |
| Objective To propose an improved QR code-based digital holographic watermark. Methods This method used encrypted Fourier holography for QR-code encryption and hologram generation. In order to hide the watermark information, the hologram image was embedded into low frequency coefficients of the host image after 2-level wavelet decomposition of the L components in the standard color space. To improve the success rate of QR code decoding, the extracted watermark was processed by cross median filter. Conclusion Comparative experiments showed that QR code watermark had the ability to retain complete watermark information and had better robustness than ordinary watermark image. Compared to other similar algorithms, the proposed method had better robustness. |
| Key words: quick response code fourier holography discrete wavelets transform median filtering |
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