基于DSP和FPGA的座舱图形显示系统关键技术研究

本文针对飞机座舱图形显示的特点，在硬件上利用DSP和FPGA实现了基于动态可重构技术的图形显示系统设计方案．通过对实际系统的研究，本文还提出了一种新型的并行流水线帧存体系结构，它能够更有效地高速传输图形数据．这样整个方案能有效地提高图形生成和显示速度，解决了在图形显示系统中的速度瓶颈问题．     

一种卷积滤波器大容量延迟线实现新方法

大容量延迟线是设计实时卷积滤波器的一个关键技术。该文讨论了几种实现延迟线的方法，介绍了一种基于FPGA 内嵌 Block RAM的延迟线设计新方法，该方法能大大节省FPGA的CLB资源，且结构简单灵活、易于扩展，并在某型飞机座舱综合图形显示系统中得到了应用。     

Hierarchical dialogue structures in interactive computer systems

A powerful yet simple-to-use command dialogue has evolved in the development of an interactive graphics system for the computer-aided design of electronic circuits. This dialogue overcomes many of the problems typically encountered in systems with a strongly hierarchical command structure; the user is kept constantly aware of the current state within the hierarchy and is able to manoeuvre rapidly about this structure. The rules for the use of the dialogue are few and simple; mistakes are not catastrophic. The dialogue is equally suited to both naïve and experienced users. The dialogue is described in the context of an interactive graphics environment, but the extension of the principles to any interactive computer system should be obvious.     

MBR膜处理控制系统的实现

该文围绕MBR膜处理系统工艺,主要介绍了该控制系统的结构、组成、硬件配置和软、硬件设计。该系统以西门子S7—300系列PLC为控制核心,通过以太网与上位机通信,实现命令输入以及图形显示,通过PROFIBUS—DP现场总线与8个PLC功能子站进行数据通信,从而实现对整个系统的控制。PLC编程软件采用SIMATICSTEP7V5．4＋SP4,上位机软件采HMISCADAIFIX4．0组态软件。     

DPGL： The Direct3D9-based Parallel Graphics Library for Multi-display Environment

The emergence of high performance 3D graphics cards has opened the way to PC clusters for high performance multi- display environment.In order to exploit the rendering ability of PC clusters,we should design appropriate parallel rendering algorithms and parallel graphics library interfaces.Due to the rapid development of Direct3D,we bring forward DPGL,the Direct3D9-based parallel graphics library in D3DPR parallel rendering system,which implements Direct3D9 interfaces to support existing Direct3D9 application parallelization with no modification.Based on the parallelism analysis of Direct3D9 rendering pipeline,we briefly introduce D3DPR parallel rendering system.DPGL is the fundamental component of D3DPR.After presenting DPGL three layers architecture, we discuss the rendering resource interception and management.Finally,we describe the design and implementation of DPGL in detail, including rendering command interception layer,rendering command interpretation layer and rendering resource parallelization layer.     

微计算机控制的多画面交互式彩色图形系统

本文阐述一个低成本、应用灵活的交互式彩色图形系统.它包含一个用于画面前后台显 示处理的多画面存贮管理部件,具有彩色图形、字符、伪彩色图象和动画四种显示模式.系统 的交互功能(例如图象/图形的输入,修改与画面编辑等)由系统软件和一个易于扩充的图形命 令语言定义,因此可望该系统能在多方面获得应用.     

Program design of STL machine graphics realistic system

This topic is based on Auto CAD graphic input environment.It takes the STL format graphic files as the data exchange interface to do the research of STL interactive 3D realistic graphics displaying content.Through the analysis of the STL file format,in VC++6.0 programming environment,class if stream in the standard IO library was used for object class definition.And get line functions in the string class were called to read and bind STL file line by line.In data processing module,draw triangles in Open GL programming technology was applied to realize the visual display of the STL graphics,with the corresponding 3D entity data generated.Open GL graphics processing technologies were applied to display 3D graphics from STL files input or realistic program module,which contain the graphic transformation,light,materials,et al.Test reports were shared based on the test of the application system.Finally the program design of STL graphics realistic display system was completed based on research work,which has certain theoretical and practical significance in the aspect of engineering application.     

立体与平面的完美结合——论立体思维下的包装图形创新

包装图形设计依附于立体的包装容器和包装盒,图形设计的最终目的是为了推销产品,传达产品的信息。因此,在包装图形设计中,就必须运用立体的思维来进行构思、创意,运用各种图形创新手法追求平面图形与立体容器的完美结合。在商品包装图形设计中立体与平面图形结合的是否完美对商品在零售环境中的促销有着积极的影响作用。因此,只有充分认识到这些,设计师设计出的商品外包装才能在商品越来越同质化的今天,获得较强的识别性。     

基于约束关系的平面立体三维重建

提出一种基于约束的平面立体三维重建算法。该算法采用参数化方式来表示空间直线及其投影,这种参数化方式能满足数字图像中直线提取所需的唯一性、有界性及均匀性条件。依据平面立体投影线图的拓扑结构隐含的三维信息,建立平面立体上棱线、表面空间位置参数之间的约束方程,联立约束方程组求其最小二乘解,恢复出平面立体的三维结构。研究成果可用于计算机视觉和智能CAD系统。     

Structural design language for coupled knowledge-based systems

A Structal Design Language (SDL) has been developed in INTERLISP environment for building coupled knowledge-based expert systems for integrated design of a class of structures. The integrated design includes the preliminary design, structural analysis, design of members, design of connections, and computer-aided drafting of the final design. The complex body of knowledge needed for detailed design of a structure is fractionated into smaller and more manageable knowledge sources which are organized into a hierarchy of cooperating conceptual specialists. SDL provides a multiwindow graphics interface capable of displaying both the orthographic and isometric views of the frame structure and beam-column connections. A three-dimensional face frame representation sentation is used for the graphic display of the beam-column connections. SDL has been used to develop a prototype knowledge-based system for integrated design of steel building structures consisting of moment-resisting frames.     

Computer graphics for cellular reconstruction

The use of computer graphics to study the three-dimensional structure of tissues within an organism such as a human is considered. A system called Sterecon, which uses stereo views of thick sections of tissues and a high-voltage electron microscope, is described. Contours of structures are traced in stereo and entered into a graphics database. Using thick sections decreases the work by ten- to twenty-fold. The database can be manipulated to display cellular organization using various graphics representations     

Design of a Multibus-compatible colour graphics subsystem

Colour graphics subsystems can be used in a variety of applications such as high-end business graphics, low-end scientific computations, and for realtime display of process control diagrams. The design of such a subsystem is shown. This subsystem can be added to any Multibus-compatible microcomputer system. The use of an NEC 7220 graphics display controller chip has simplified the design to a considerable extent. CGRAM (CORE graphics on Multibus), a comprehensive subset of the CORE graphics standard package, is supported on the subsystem.     

The design of an interactive graphics system for the display of meteorological fields

We describe a computer graphics system for the display of meteorological fields (such as plots of temperature and pressure). Much of the design effort has gone into the command processor which uses the usual command format of VERB PARAMETER = VALUE … The parameter and values are defined in terms of a tree sructure and the program searches as much of the tree as is necessary to make an unambiguous indentification of a token (where such an identification is possible). Because of this, commands can generally be abbreviated to the format VERB VALUE. This shortened form is possible even when the value of the command parameter is numerical. This is achieved by always specifying the units of numerical values (such as 5 days, 24 hours, 1000 millibars, etc.). The command format allows the user to manipulate a number of fields to form derived fields such as the difference of two pressure forecasts. The use of defaults for all parameters (which change as the user requests plots), reduces the amount of typing required to a minimum. A ‘Help’ facility aids the user in his choice of commands.     

3ds Max中样条线的编辑研究

3ds Max中的编辑样条线命令在复杂模型的建模方面具有重要作用,通过对二维图形的编辑修改,能够创建出一些非常复杂的三维模型,对提高三维实体建模的效率和质量具有十分重要的意义。     

A complete development process of finite element software for body-in-white structure with semi-rigid beams in .NET framework

At the conceptual design stage, simplified finite element (FE) model of body-in-white (BIW) structure focuses on its specific merit to provide early-stage predictions for detailed FE model of that. This paper exploits a semi-rigid beam element (SRBE) that consists of a beam element with two semi-rigid connections at the ends to simulate the flexibility of joint. Guyan reduction method condenses the SRBE as a super element. A special finite element software for structural modeling and analysis of BIW (SMAB) is developed in .NET framework. The Unified Modeling Language is employed to depict the classes and their relationship. The design patterns are identified and applied in the framework design to facilitate communication and system expansion. Microsoft DirectX and GDI+ implement graphics display of spatial BIW frame and planar thin-walled cross section. Based on multi-threaded technology in .NET, subspace iteration method is paralleled to speed up the mode analysis. As a result, the efficiency of the SRBE is demonstrated by a benchmarking automotive body. Multi-threaded parallel is effective and useful, especially for frequency optimization.     

A General-Purpose Multi-Microprocessor Raster Graphics Display System with Anti-Aliasing

The raster graphics display system described represents a general purpose mini-computer, specially for CAD applications. The system is based on a hierarchical asynchronous multiple microprocessor system. In practice this mini-computer is extendable up to 15–20 workstations. On the workstations, different graphical and non-graphical devices can be connected. The most interesting workstation is a raster graphics display device which was developed specially for the computer system described. This raster graphics display device contains a processor for the application program, two dedicated processors and two separate identical frame buffers, each of them containing one whole set of image data. Applying algorithms for anti-aliasing, virtual pixel dislocation (intensity dislocation) and multi-pixel-overlappings with hidden line (surface) elimination the image readability and quality can be increased considerably. In particular the paper deals with an anti-aliasing algorithm with a real-time hardware realization.     

基于VB6．0和OpenGL的DXF文件读取与交互控制

DXF文件格式是传统图形开发中最常用的图形交换格式之一,众多第三方开发的图形软件均加入了对DXF文件的支持。为开发一套三维可视化仿真数据分析软件,首先就必须解决对DXF文件的读取及显示问题。文章详细分析了ASCII码格式DXF文件的数据结构特点,然后,使用VB6．0从中读取数据,并利用OpenGL的模型绘制和渲染功能,实现了三维模型的重构以及交互控制。这种处理方法既能满足快速建模的需要,又能高效地实现友好的交互功能。     

VR-Platform校园漫游系统研究与实现

传统场景漫游系统的构建方案大多数是依托三维图形库绘制几何体结构来制作目标对象,虽然这种技术已经十分成熟,但过程复杂、费时费力。针对此不足,在VR-Platform虚拟平台的基础上,辅助3dsMax建模和实体场景图片实现了交互式西南科技大学校园漫游系统。此系统不仅具有立体导航功能,而且可以结合动画对校园进行多方位展示。     

基于抽象工厂模式的机载显示系统图形生成技术研究

机载显示系统直接关系到先进航电系统的性能和成本,针对机载显示系统的特点、性能要求,分析了目前机载显示系统存在的复用率低、不易于移植、继承性差、无法重构、成本高等缺陷。提出了基于抽象工厂模式的图形生成设计新思想,对机载显示系统图形库进行分类、分级抽象,建立图形处理模型、图形绘制模型和显示模型三级架构,统一了字符、图形、窗口的模型处理方法。基于OpenGL实现了图形模型开发库和机载显示系统图形生成架构,以该方法实现了某型飞机显示系统的开发,实验证明,该方法实现了显示系统通用开发技术和软件重构技术。     

有限元分析计算结果的计算机图形可视化显示

科学计算结果的计算机图形可视化显示是提高计算效率，减少劳动强度，保证设计正确的有效方法，本文将计算机图形可视化技术应用于有限元分析中，开发了一个有限元分析结果的可视化显示系统，介绍了该系统所采用的、数据管理和实现的功能。重点介绍了有限元分析的网格、计算结果的位移和应力的可视化显示方法。