【作者】 甘斌；

【导师】 石永革；

【作者基本信息】 南昌大学 ， 计算机应用技术， 2010， 硕士

【摘要】 随着数字产品的迅速发展,数字产品的安全性成为备受关注的课题。当今人们普遍采用密码技术来保证数字内容不被非法阅读,采用数字签名技术来确保数字产品内容不被冒充和篡改,而为了保护数字产品内容的产权不被侵犯,人们提出了数字水印技术,该技术现已成为国内外研究的热点。本文综述了数字水印技术的相关知识,对数字水印技术进行系统深入的研究分析,详细研究了数字水印模型和典型的数字水印算法。通过改进后的Arnold图像置乱算法对数字水印图像进行加密处理,加强数字水印的抗攻击能力。同时结合奇异值分解的特征,对小波变换的图像进行奇异分解处理,以增强数字水印的隐蔽性和鲁棒性。典型的小波变换数字水印算法采用中高频部分嵌入数字水印信息,在有损害压缩、滤波等图像攻击下,数字水印信息容易被破坏。经分析研究,在数字水印信息量小的情况下,采用小波变换后的低频部分嵌入水印信息可以较好的提高数字水印的鲁棒性。以此为基础,提出并设计了一种基于奇异值分解离散小波变换的优化算法。测试结果证明,这种改进的算法具有较高的峰值信噪比,同时对几何剪切、高斯加噪和JPEG压缩等攻击都具有较强的抗攻击能力。最后,根据企业电子发票业务安全管理需求,提出一种基于数字水印技术的身份验证系统方案,以对优化的算法进行应用验证。更多还原

【Abstract】 With the rapid development of digital products, the security issuses become a concerning problem.Nowdays,people usually use cryptography to ensure that digital content is not illegal to read.Using digital signature technology ensures that the digital product content will not be distorted..In order to protect the property of digital products content not be violated,people have proposed digital watermarking technology, which has become a hot resarch at home and abroad.This paper reviews the theory of digital watermarking technology-related knowledge, and does systematic and thorough research on digital watermarking technology, detailed research of digital watermarking model and the typical digital watermarking.Using improved Arnold digital image scrambling algorithm to encrypt the watermark image processing, and enhance the anti-attack capability of digital watermarking. Combined with the characteristics of singular value decomposition, it processes the singular decomposition of wavelet transform image to enhance the digital watermark invisibility and robustness. A typical wavelet transform digital watermarking algorithm embeds digital watermark informationin in high-frequency part.By compression, filtering and other image attacks, the digital watermark can easily be damaged. After analysis,in the case of small amount of digital watermarking information,embedding watermark information in wavelet transformed low-frequency part can better improve the robustness of digital watermarking. On this basis, a wavelet transform algorithm based on singular value decomposition is proposed. Test results show that the improved algorithm has higher peak signal to noise ratio, as well as strong anti-attack against cropping, high noise and JPEG compression attacks.Finally, according to security management needs of business electronic invoice, an authentication scheme is proposed based on digital watermarking, to verify the application of the optimizad zalgorithm.更多还原