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基于静态图像的数字水印技术研究
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摘要
数字水印技术为实现有效的知识产权保护提供了一条崭新的思路,近年来已成为多媒体信息安全研究领域的一个热点问题。文中研究了基于静态图像的离散余弦变换域的数字水印版权保护技术。
     通过对JPEG压缩以及人眼视觉系统理论的研究,确定了把水印信息嵌入到图像的离散余弦变换域的中频系数部分;为了加强数据传输时数字水印的安全性,使用了矩阵乱序加密方法;在详细分析数字水印技术特性和需求的基础上,从提高水印的不可见性和鲁棒性出发,对现有算法进行改进,提出了两个新的离散余弦变换域数字水印算法。一个是在分析原有的明文水印算法基础上,通过对原始载体图像进行量化处理来增强水印的嵌入强度。另一个是在分析了中频系数量化盲水印算法基础上,通过对水印信息进行纠错处理改进了该算法,使其表现出更好的鲁棒性。
     最后对明文水印算法和盲水印算法及其改进的算法均进行了大量的不可见性和鲁棒性实验。实验结果表明,改进后的算法具有很好的不可见性,对常见的图像处理操作具有很强的鲁棒性。
Digital watermarking provides a novel way for the protection of intellectual property rights, and becomes a hot spot in the research of multimedia data security in recent years. The technique of DCT-Based digital watermarking for copyright protection of static image is studied in this paper.
    By studying JPEG compression and HVS theory, watermarking information is embedded in the DCT intermediate frequency coefficient part of the image. In order to enhance security level in the data transfers, matrix scrambling algorithm is used. After deeply analyzing the technical characteristics and requirements of image watermarking, two present algorithms are improved to enhance their imperceptibility and robustness, and two DCT-based image watermarking algorithms which can be applied to copyright protection are put forward in this paper. The first method is an improved DCT-based private watermarking algorithm. The embedment intensity of watermarking is enhanced by the quantization of the originality carrier image. The second method is a DCT-based blind watermarking algorithm. After analyzing the algorithm of intermediate frequency coefficient quantization processing blind watermarking, the robustness of watermarking is enhanced by correcting the watermarking image.
    Finally, a lot of experiments are performed to test the imperceptibility and robustness of the private watermarking algorithm and blind watermarking algorithm and the two improved algorithms. The experimental results indicate that the improved algorithms are more imperceptible and robust than the original algorithms.
引文
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