基于AutoCAD中工程图的生成

随着计算机的发展,三维图形得到推广与应用,而在生产中,还是需要一些二维图形,这就要求我们将三维图形转换成二维图形,在AutoCAD中生成工程图(二维图形)就必须解决几个问题:视图的生成、剖面线的设置、线型、尺寸标注等.     

微型计算机图形学讲座 第三讲 三维图形学的基础

第二讲,我们讨论了二维图形。但二维图形只能反映物体的宽度和高度,在解决实际问题中,只研究二维图形是远远不够的。例如:在机器零件制造中,一个零件从设计到生产出来,设计者与生产工人交流的媒介,主要是通过图纸。对于一个较为复杂的零件,二维图形很难使生产者正确理解设计人员的设计思想,因为二维图形不具有立体感,真实性较差。而三维图形的最大优点就是立体感强、直观。另外,在光学设计、建筑、航空等诸多领域中,都要或多或少地碰到类似的问题。所以需要进一步研究空间图形,即三维图形。本讲主要讨论绘制三维图形的原理以及怎样在计算机上显示三维图形。计算机屏幕是二维显示器,而具有图形功能的计     

STL、DXF等通用文件格式图形的真实感显示

以AutoCAD作为图形输入环境,以STL、DXF等格式的图形文件作为数据交换接口,对图形进行交互式立体显示,通过分析文件格式,在Visual C 6.0编程环境下获取文件中的二、三维图形信息,对其中基于回转体的二维图形进行三维旋转造型,生成三维实体数据。并应用OpenGL图形处理技术对输入的三维图形实现真实感显示,进行变换、光照、材质等方面的处理。     

AutoCAD中二维图形向三维图形的转换

介绍了一种在AutoCAD中将二维图形转换为三维图形的方法.     

带式输送机三维设计中坐标计算及图形呈现的研究

对带式输送机的设计进行研究,针对输送机出图不方便的缺点,引入零部件的坐标计算和基于AutoCAD的带式输送机的二次开发。在此基础之上,实现三维图形和二维图形的快速生成。     

一种基于3D MAX的数字水印算法

3D MAX是当前流行的三维设计与制作软件,3D MAX设计的作品同样面临侵权问题。提出了一种在3D MAX软件中实现的数字水印算法。在3D MAX中,利用创建面板中的二维图形工具,在视图中创建一个二维图形,通过分析二维图形的特性,在二维图形的顶点或边上选择合适的位置来嵌入水印。然后利用添加编辑修改器的方法,将二维图形转换为三维模型,最后将三维模型渲染输出。三维模型在使用过程中发生版权纠纷时,可以分析三维模型的二维基础图形,利用嵌入水印的逆过程将水印提取出来,以此为依据来判断版权归属,从而可以保护3D MAX设计作品的版权。     

基于OpenGL的球体生成算法可视化仿真研究

研究计算机图像的三维可视化优化问题,针对图像生成慢的缺点,为了仿真计算机图形学中三维球体的生成过程,提高图像生成速度,提出了一种三角形分割的算法,实现了球体生成算法可视化的仿真系统CM.系统的实现,摒弃了原来可视化系统中依靠计算最佳逼近"像素点"的位置来显示图形的方法,而是用三角形面代替原来的"像素点",对其进行一系列的分割以实现最终效果.实验结果表明,方法可以实现三维图形生成算法可视化仿真效果,突破了原来只能实现二维图形的局限性,而且生成图形的速度较快,具有很好的逼真度.     

基于OpenGL的地质图像三维重建

本文通过对图像进行坐标空间定义,并在图像处理中,引入了图层的概念,在三维重建中,对三角部分进行了规则定义。通过图形变换,将简单图形生成复杂图形,并把二维图形表示三维形体,对静态图形快速变换而获得图形的动态显示效果。图形变换能够旋转对象、移动对象、拉伸、压缩和缩放对象,从而通过三维重建和虚拟现实技术实现地质结构的三维数字化模型和地质结构的动态虚拟显示,对地质结构进行分析提供了直观的预测。     

AutoCAD图形输出

本文介绍了AutoCAD二维图形及三维图形输出的方法,在输出过程中常见的问题及如何解决.     

在AUTOCAD中实现三维实体物性的精确计算

利用AUTOCAD软件绘制产品的二维图形,通过编写程序将其二维图形生成三维实体,并进行体积、表面积、重心和惯性矩等物性的精确计算.     

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。     

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.     

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.     

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     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

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。