一种基于小波变换域的有意义图像盲水印算法

提出了一种基于小波变换域的有意义图像盲水印算法。算法中利用乘性隐藏方法在原始图像小波高频系数中嵌入一幅二值图像信息,通过拉普拉斯分布对原始图像小波变换域高频系数的统计分布特性进行建模,然后采用最大似然(ML)法推导得出了一个盲水印检测器,并且利用该检测器实现了一个有意义图像的盲水印算法。实验表明该算法具有较好的隐蔽性和鲁棒性。     

Image watermarking using tree-based spatial-frequency feature of wavelet transform

In this paper, an image watermarking scheme is developed using the tree-based spatial-frequency feature of wavelet transform. With our approach, the watermark sequence is inserted in those high activity texture regions of an image having the maximum strength of just noticeable distortion (JND) tolerance of the human visual system (HVS). Simulation results show that the proposed method achieves a good compromise between the robustness and transparency.     

Patenting neural networks-an introduction

Two well-known former neural computation researchers explain the legal protection available for neural networks in Europe, and in particular the applicability of patent law to the unique concepts underlying neural research¹. The result is an introductory guide for all groups whose projects are approaching, or have taken, the leap from the drawing board, and who wish to make commercial use of their results.     

多功能数字水印在版权保护中的应用

本文提出的多功能数字水印算法是基于静止图像内容的版权保护功能实现。多功能水印可实现内容的版权保护和用户跟踪。其中,前者利用RS纠错编码的系统码特性,针对客户端与认证中心分别设计了水印提取算法,保证了两者不同的鲁棒性能要求。后者,采用奇异值量化和分组嵌入算法添加水印,达到了高强度鲁棒性的效果,在受一般攻击的情况下仍能100％提取。仿真结果也证明了该算法的有效性。     

基于数字水印的买卖交易协议

随着网上电子商务的飞速发展,数字产品的版权保护和盗版跟踪日益成为一个迫切需要解决的问题。数字水印技术是保护数字产品版权的一个潜在解决方案。该文分析了在买卖交易中,数字产品提供者、购买者、水印认证中心的责任和要求,设计了一个基于数字水印的买卖交易协议,该协议防止了水印被盗用的可能性,并保证了数字产品提供者及购买者双方的权益。     

数字水印技术及多媒体信息安全

本文在对数字水印技术的概念、原理、特点及分类等作阐述的基础上分析了数字水印技术的模型及主要算法，并重点介绍了数字水印技术在多媒体信息安全中的应用。最后对数字水印技术的发展做出了展望。     

基于DWT的图像数字水印算法研究

该文提出了一种基于DWT多分辨率分解的数字水印技术。利用多分辨率分解技术，分别将原始图像与水印图像进行三层离散小波变换，将相同分辨率层次水印嵌入到对应的相同分辨率层次的原始静态图像之中，使水印对原始图像具有自适应性。实验结果表明，该文提出的水印算法经某些图像处理操作和JPEG压缩后仍是鲁棒的。     

DNA sequence watermarking based on random circular angle

This paper discusses DNA watermarking for copyright protection and authentication of a DNA sequence. We then propose a DNA watermarking method that confers mutation resistance, amino acid residue conservation, and watermark security. Our method allocates codons to random circular angles using a random mapping table and selects a number of codons for embedding targets using the Lipschitz regularity that is measured from the evolution across scales of local modulus maxima of codon circular angles. We then embed the watermark into random circular angles of codons without changing the amino acid residue. The length and location of target codons depend on the random mapping table and the singularity of detection of Lipschitz regularity. This table is used as the watermark key and can be applied to any codon sequence regardless of sequence length. Without knowledge of this table, it is very difficult to detect the length and location of sequences for extracting the watermark. From experimental results on the suitability of similar watermark capacities, we verified that our method has a lower bit-rate error for point mutations compared with previous methods. Further, we established that the entropies of the random mapping table and the location of target codons are high, indicating that the watermark is secure.     

基于小波域的自适应图像水印算法

多媒体信息的数字化极大地提高了信息表达的效率和准确性,随着网络技术的快速发展,数字媒体的传播变得更加方便和快捷,但同时盗版和侵权的问题也日益严重,数字水印技术作为一种数字媒体版权保护的有效方法近年来引起了人们的高度重视.提出一种基于小波变换的自适应图像水印算法,该算法利用了人类视觉系统的特性,根据图像分块扫描序列中两相...