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计算机图形技术已应用于不同的领域:如教育、商业和科学等,为使学生在Internet上理解计算机图形学的算法,我们开发了计算机图形学(CG)教育系统。计算机网络的作用为:通过WorldWide Web(WWW),散居的人们利用文字、图象和声音等进行通讯。我们在网络上开发了计算机辅助教学系统(CAI),以帮助每个学生独立地学习计算机图形学。构造CAI系统的概念如下;(1)易于理解的手册;(2)可多人独 相似文献
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简要介绍了用计算机自动处理胶片摄影图象的自动输入装置,并详细介绍一种线阵CCD器件和步进电机组合用于胶片摄影图象自动输入装置的结构及精度,以及此种输入装置在自动胶片判读仪系统中的应用。其输入速度达10帧/秒,胶片输片精度达0.015mm(TMS)。 相似文献
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认识计算机图形图像的两种类型--位图图像和矢量图形 总被引:2,自引:0,他引:2
本文简明地阐述了构成计算机图形图像的两种主要组合类型—位图图像体系和矢量图像体系的基本科学概念和技术知识。 相似文献
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对《任意曲线透视投影的逆变换》中作出的以下3项研究结果进行了探讨并提出了不同见解:(1)透视投影的逆变换基本方程;(2)根据长方体上一个矩形的投影确定其长宽高之比;(3)由实体的透视图象准确重建其三维信息。 相似文献
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The STEP-NC project, which is an international IMS project researching ISO14649, was performed to develop and supplement ISO14649, which will replace the G&M code, which itself is based on ISO6983 and has been a widely used standard for machine tools' operation. There has been much interest in ISO14649 as a database, which is based on the ISO10303 STEP, and international standard for three-dimensional computer-aided design that combines computer-aided manufacture data and the numerical control (NC) command. This study examines a milling machine operated by ISO14649, which is called a STEP-NC milling machine. Instead of directly giving the tool path to CNC machines, ISO14649 just provides the information required in generating tool paths. Therefore, to make a STEP-NC machine, a tool path generator and motion controller operated by the STEP-NC code are required. A controller was developed combining the personal computer and motion control board for the personal computer. The tool path generator and all software in this system were made with Visual C++. The STEP-NC file was arranged in XML, which has the same structure and format as the original STEP-NC file and was used as an input file in order to make good use of the personal computer-based environment in this study. In addition, example 1, included in ISO14649-11 dis version, was machined to test the manufactured STEP-NC milling system. 相似文献
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考察新歼平显画面计算机仿真练习对于提高飞行员平显画面认知效果的有效性和可靠性。方法飞行员10名,按模拟器的前测成绩分为对照组和试验组。试验组应用平显计算机仿真练习,对照组无练习。练习六天后对10名飞行员进行模拟器的后测。比较施加不同处理的两组被试其在模拟器上考核的前后成绩和反应时间是否有差别。结果试验组与对照组在模拟器考核的前后成绩上有差别(P〈0.05),两组在试验前后综合感知模拟器平显画面的反应时间差异不显著。结论使用平显画面计算机仿真练习反复进行练习,能够在一定程度上提高飞行员对飞行训练模拟器平显画面的认知成绩。 相似文献
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本文简要论述了钢筋混凝土框架及连续梁计算机辅助设计系统FBCAD中图形数据文件的格式,并给出了在此图形文件格式基础上编制的图形显示及绘图和图形文件转换的基本程序清单。 相似文献
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基于AutoCAD的网络化CAD实现 总被引:2,自引:0,他引:2
为了充分利用网络资源和计算机技术,实现跨平台的信息融合。利用ISAPI通讯接口封装技术实现了不同客户软件的集成。应用FTP或HTTP标准数据传输协议,采用标准IDL接口实现了远程文件格式转换服务,解决了CAD系统之间的文件格式不兼容问题。基于AutoCAD2000i编制了进行远程终端可视化参数处理的VBA宏,设计并实现了计算服务调度管理器和远程有限元分析服务,为现代产品设计提供了一种信息获取和资源共享的有效途径。 相似文献
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A system utilising radiation transport codes has been developed to derive accurate dose distributions in a human body for radiological accidents. A suitable model is quite essential for a numerical analysis. Therefore, two tools were developed to setup a 'problem-dependent' input file, defining a radiation source and an exposed person to simulate the radiation transport in an accident with the Monte Carlo calculation codes-MCNP and MCNPX. Necessary resources are defined by a dialogue method with a generally used personal computer for both the tools. The tools prepare human body and source models described in the input file format of the employed Monte Carlo codes. The tools were validated for dose assessment in comparison with a past criticality accident and a hypothesized exposure. 相似文献
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A direct-slicing approach might improve the accuracy and quality of small, complex parts produced with rapid prototyping technology. An application software based on direct slicing for rapid prototyping was used on the foundation of PowerSHAPE models. Lines, conic arcs and cubic bezier curves were adopted as the basic elements describing the direct-slicing contours. Moreover, a scheme to carry out subdivided software development was proposed. A picture (PIC) format file was selected as an interface for the slicing data, and a macro-AutoSection software, which collects the direct-slicing contour data of arbitrary complex computer-aided design models and provides power to produce the direct-slicing PIC files, was developed. On the above basis, an application software called PDSlice based on direct-slicing data processing was developed for the commercial selective laser sintering machine HRPS-III, which was made at the Huazhong University of Science and Technology (HUST), P. R. China. The major input and output interfaces as well as the PIC model reconstruction method of the PDSlice are described. Furthermore, a batch of direct-slicing polymer parts were successfully fabricated with the selective laser sintering machine. The application example shows that the accuracy and surface finish of three-dimensional complex curvature surface parts fabricated with the application software system based on a direct-slicing format were better than the application software system based on a stereolithography (STL) format. 相似文献