| 基于LDPC码的数字图像水印技术研究与利用 |
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| 引用本文： | 霍智勇.基于LDPC码的数字图像水印技术研究与利用[J].南京邮电大学学报(自然科学版),2006,26(6):77-81,85. |
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| 作者姓名： | 霍智勇 |
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| 作者单位： | 南京邮电大学,传媒技术学院,江苏,南京,210003 |
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| 摘 要： | 主要研究了LDPC码在数字水印中的应用。图像水印系统和通信系统的模式具有相似性，对一种基于LDPC码的图像数字水印算法进行了研究。该算法利用LDPC码的纠错性能和图像的人眼视觉特性（HVS），以实现静止图像中数字水印的嵌入和提取。实验结果表明，该算法降低了水印在传输过程中的差错率，具有很强的鲁棒性和隐匿性。
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| 关 键 词： | 数字水印 LDPC码 离散余弦变换 |
| 文章编号： | 1673-5439（2006）06-0077-05 |
| 收稿时间： | 2006-01-30 |
| 修稿时间： | 2006-01-302006-04-11 |
A Study and Application of Digital-Image Watermarking Technique Based on LDPC |
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| HUO Zhi-yong.A Study and Application of Digital-Image Watermarking Technique Based on LDPC[J].Journal of Nanjing University of Posts and Telecommunications,2006,26(6):77-81,85. |
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| Authors: | HUO Zhi-yong |
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| Institution: | College of Communications and Media Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, China |
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| Abstract: | This paper investigates the application of the LDPC codes in Digital image watermarking. Based on the analysis of the equivalent channel in the digital watermarking system, a watermarking algorithm for digital image on the basis of LDPC code is studied. The algorithm embeds and retrieves the watermark signature into and out of the static image by employing the LDPC code technology and the human visual characteristics. The results demonstrate that the proposed algorithm has greatly decreased the error code rate of the retrieved watermark and improved the robustness and invisibility. |
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| Keywords: | Digital watermark LDPC code DCT |
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