基于HVS的变换域的数字水印算法设计与实现

从安全性和鲁棒性等方面综合考虑．当前变换域水印嵌入技术应用广泛。鉴于在DCT域进行数字图像隐藏会出现“方块效应”以及人眼视觉系统的特征．介绍DCT变换及其在图像信息隐藏中的应用,提出在DCT域进行信息嵌入的算法。     

基于人眼视觉特性的DCT域彩色图像的信息隐藏

在MATLAB环境下实现了基于人眼视觉特性的DCT域彩色图像的信息隐藏.经过对DCT变换的特征分析,选用载体图像DCT系数的中频部分作为待隐藏图像的DCT系数.实验结果表明,嵌入隐藏信息后的两幅图像在视觉上人眼无法分辨,算法具有良好的隐秘性和较强的鲁棒性.     

基于Arnold变换的信息隐藏算法研究

提出了一种利用Arnold对称性变换的图像信息隐藏算法,待隐藏的秘密信息以及公开的承载信息均为灰度级静止图像。首先对秘密图像进行Arnold置乱变换,形成秘密信息,然后对载体图像进行DCT变换,秘密信息通过量化处理嵌入到DCT域中。对提出的算法进行了各种攻击测试。实验表明,该算法对JPEG有损压缩、中值滤波攻击和高强度噪声攻击具有强稳健性,具有很好的透明性和鲁棒性,实用性也较高。     

一种基于模糊分类的信息隐藏方法

提出了一种在图像DCT域内的信息隐藏方法。为了在保证隐秘图像视觉质量可以接受的前提下,有效提高载体图像的信息隐藏量,首先根据HVS特征和模糊理论将载体图像的各个DCT子块分为三类,然后根据DCT子块的类型不同,自适应变化嵌入每个DCT系数的秘密信息的位数。实验结果表明：该文方法在图像质量和信息嵌入量方面,都优于DCT域内固定嵌入位数的信息隐藏方法。此外,在秘密信息提取时,该文算法不需要参考原始载体图像,实现了提取信息的盲检测。     

一种新算法在图像信息隐藏中的应用

在研究人类视觉特性和DCT变换的基础上,提出了一种基于图像DCT域的分块自适应隐藏算法.算法将经过幻方置乱的秘密图像转换为一维二进制流,并根据人类视觉特性将随机间隔法选择的载体图像子块分成三类,再分别采用不同的嵌入策略把秘密信息嵌入到子块中.对平滑块是通过调整两个量化系数相同的中频DCT系数的相对大小,来完成秘密信息的...     

基于灰关联的自适应灰度图像信息隐藏算法

以灰关联理论和小波变换为基础,提出一种具有良好透明性和鲁棒性的信息隐藏算法.使用自定义压缩方法对预嵌入的水印灰度图像进行压缩后置乱编码.根据灰关联度的大小在载体图像的小波变换域中选取相对非平滑区作为秘密信息隐藏的区域.对区域进行DCT变换后尽量选取中高频系数中绝对值大的系数作为秘密信息嵌入位.根据小波域的人眼视觉掩蔽特性确定嵌入的强度.实验表明,文中算法具有比较好的透明性,而且能够对一些常见的攻击如噪声、几何剪切、JPEG压缩、滤波等均具有较好的鲁棒性.     

基于分割采样的小波域图像信息隐藏算法及性能分析

提出了一种结合加密技术的小波域变换图像信息隐藏算法.该方法首先利用分割采样置乱变换对待隐藏图像进行变换加密处理,并对载体图像进行多分辨率小波分解,然后根据人眼视觉特性自适应选取信息隐藏的小波变换域系数.在此基础上,将置乱加密信息乘上一个调节嵌入深度的权值后叠加到所选小波域嵌入位置,实现图像信息的自适应隐藏.实验结果表明,所提出的信息隐藏算法具有非常好的不可见性,对于大量的隐藏攻击手段具有较好的安全性和鲁棒性.     

一种基于置乱和融合的图像DCT域信息隐藏算法

提出了一种基于置乱和融合的DCT域图像信息隐藏算法,采取先置乱秘密图像然后在DCT域融合载体图像跟秘密图像的系数矩阵,从而提高隐密图像的不可感知性,也提高了嵌入的信息量。     

基于间隔控制的信息隐藏算法

提出一种在图像离散余弦变换（DCT）域内的信息隐藏算法。为了在基本保证隐秘图像视觉质量的前提下有效提高载体图像的信息隐藏量,该方法使用随机序列进行间隔控制,选择信息嵌入位,把随机序列的种子看成密钥,通过比较变换后的2个DCT系数完成信息的隐藏。试验结果表明,该算法可以兼顾秘密信息隐藏的不可见性和鲁棒性,密钥空间大,能够实现自适应隐藏和提取信息的盲检测。     

基于方向编码的离散余弦变换域图像隐写算法

提出一种基于方向编码的离散余弦变换(DCT)域图像隐写算法。将秘密图像进行8×8块的离散余弦变换后,采用JPEG标准量化表进行量化,将得到的DCT系数做行程编码,间接提高嵌入容量。同时对载体图像进行8×8块的离散余弦变换,采用改进的量化表进行量化,由此提高嵌入容量和含密图像的质量。通过基于方向编码的嵌入算法将秘密信息嵌入载体图像DCT系数的中低频部分。实验结果证明,该隐写算法嵌入容量大,得到的含密图像视觉质量好,可抵抗 分析攻击。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.