基于奇异值分解的三维网格模型数字水印算法

针对三维网格模型的版权保护提出了一种新的基于奇异值分解(SVD)的数字水印算法。算法利用几何信号处理框架将三维几何信号转换成平面规则采样信号，再用SVD技术嵌入水印。实验结果表明，算法具有较好的透明性和鲁棒性。     

A robust method for fingerprinting digital images

In this paper, a method to fingerprint digital images is proposed, and different watermarked copies with different identification string are made. After determining the number of the customers and the length of the watermark string, this method chooses some values inside the digital image using a characteristic function, and adds watermarks to these values in a way that can protect the product against the attacks happened by comparing two fingerprinted copies. The watermarks are a string of binary numbers -1s and 1s. Every customer will be distinguished by a series of 1s and -1s generated by a pseudo-random generator. The owner of the image can determine the number of customers and the length of the string as well as this method will add another watermarking values to watermark string to protect the product.     

卫星数字电视系统缺陷及解决思路研究

随着家用数字卫星电视的迅猛发展,数字卫星加密电视已渐渐走入千家万户。接收卫星加密电视必须拥有卫星运营商提供的解密卡,当前解密卡较贵,市场上便出现了提供商非法将正版解密卡的控制字(Control Word,CW)信息以较低的价格给多个用户有偿共享,从中牟取暴利的现象,本文就导致控制字CW被共享的原因进行了专业分析,并提出了有效应对该系统缺陷的六大解决思路,从而有效打击共享服务提供商,保护卫星运营商的合法权益,促进数字卫星加密电视的健康发展。     

一种基于相关值检测盲水印方法

针对传统的相关值检测盲水印算法嵌入信息量小,提取水印正确率低的缺点,提出了一种结合分块SVD分解的相关值检测盲水印方法,它在嵌入过程中对原始图像进行分块SVD分解,取最大的一部分奇异值重新构成载体图像块,将水印置乱后,水印信息通过向载体图像块叠加一个高斯分布的模板实现嵌入,在保证透明度的同时增大了嵌入量.为提高水印提取的准确率,首先通过对待检测图像滤波预处理,然后通过比较相关值的大小来判断水印信息.实验结果表明,新的算法在保证水印的不可见性的同时,增加了嵌入信息量,提高了检测的准确性,且对于常见的图像压缩、噪声和剪切等攻击具有良好的鲁棒性.     

版权标识与篡改定位的数字图像水印方案

针对JPEG图像提出了用于版权标识和篡改定位功能的图像水印算法.水印嵌入和提取算法基于JPEG图像解压缩后的像素矩阵进行.水印算法结合了JPEG压缩核心技术DCT变换系数进行版权标识水印和篡改定位水印的嵌入和提取处理过程.水印算法性能测试对象为银行票据图像,实验结果包括给出了水印算法的图像体积增幅比、PSNR值以及水印误比特率指标结果.实验结果表明,算法在版权标识和篡改定位方面均具有较好的实用性.     

Design Instruments of Service in the Era of Connection

The move towards digital connectivity demands a major rethink of processes, professional obligations and value propositions in architecture. Here, Phillip G Bernstein – architect, educator, technologist, and a vice-president of Autodesk, Inc – examines how digital modelling is destroying the barriers between design and execution. He considers what impact this has on liabilities and copyright, and investigates the possibilities for architects and builders to be financially rewarded for the performance promises that the new technology makes possible.     

Methods for automated detection of plagiarism in integrated-circuit layouts

Student projects have always been plagued by plagiarism. Integrated-circuit (IC) design courses are no exception. Since layout is considered the most laborious part of circuit design, it is common for students to reuse their colleagues? work with some minor modifications intended to make the cheating harder to detect. While software detecting plagiarism in text or computer code is commonly used these days, no counterpart exists for IC layouts. This paper proposes several criteria of IC-layout dissimilarity that can be used for computer-aided layout matching. A program based on these criteria is shown to successfully identify similar layouts in a pool of designs.     

多媒体数字信息全程跟踪及信息安全保护系统研究

分析了当前有关信息安全保护措施及其缺陷，提出了一种新的信息安全保护技术一多媒体数字信息全程跟踪及信息安全保护系统。它能将信息侵权行为的约束贯穿于信息产品的整个生命期（从生产者发布信息开始直至信息消亡），而且信息超级用户能对带产权的信息产品进行全程跟踪。