基于非对称扩展的可逆水印研究

项目名称： 基于非对称扩展的可逆水印研究

项目编号： No.61502242

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 自动化技术、计算机技术

项目作者： 陈先意

作者单位： 南京信息工程大学

项目金额： 20万元

中文摘要： 信息技术的快速发展促使数字媒体在计算机网络迅速普及，极大地便利了人们的日常生活和工作，但同时也导致了诸如隐私泄露、版权纠纷等问题。为保障这些信息的安全，数字水印技术应运而生。可逆水印是数字水印的一个重要研究领域，其能无损恢复原始载体的特性，弥补了常规水印的不足，近年来取得了巨大的发展，尤其是基于扩展的可逆水印技术。本课题拟对可逆水印从误差生成到水印嵌入各个阶段的非对称性进行深入研究，从而减少水印图像的扩展扭曲，提高水印图像质量。其研究内容不仅包括非对称扩展的一般理论框架，如非对称预测机制、双层补偿嵌入策略、非对称分布特征和算法评价等；而且还涉及当前热点扩展算法（如误差对扩展、二维误差直方图等）采用非对称手段嵌入水印时的关键技术，如误差对预测机制、二维非对称误差扩展和有向整数变换等。本课题为可逆水印研究提供新技术和方法，为推动数字图像安全应用提供理论基础和技术支撑。

中文关键词： 可逆数字水印；图像数字水印；脆弱水印；不可感知性

英文摘要： The rapid development of information technology has led to rapid popularity of digital media in the computer network, its greatly facilitate the people's daily life and work, but it also caused another such as leakage and copyright protection. In order to protect copyright of digital information and restore the original information, reversible watermarking technology emerge as required, it supplements the defect of regular watermarking, and it makes great development in recent years, especially the expansion based reversible watermarking technology. The project is committed to reduce the expansion distortion which caused by the watermarking embedding, and prepare to research the asymmetry of reversible watermarking from the stage of error generation to watermarking embedding. The research contents not only include the general theoretical framework of the asymmetric expansion, such as asymmetric prediction scheme, the double complement embed strategy, the asymmetric distribution feature and algorithm evaluation, and so on; but also involve the key technologies (such as error, error of two-dimensional histogram, etc.) that the current hot technologies used in asymmetric expansion method, such as the prediction scheme of error pair, the two-dimensional asymmetric error expansion and directed integer transform, etc. The study provides new technology and method for the application of reversible watermarking, and provides theoretical basis and technical support for promoting the digital image security applications.

英文关键词： Reversible watermarking;Digital Image watermarking;Fragile watermarking;Imperceptibility