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1.
直线与典型曲线的统一反走样整数生成算法   总被引:2,自引:1,他引:1  
针对目前尚不存在有效的圆和椭圆的整数反走样算法问题,利用修改的中点法,提出了完全利用整数运算实现的像素级反走样直线、圆和椭圆逐点绘制的统一算法.根据中点法中的误差控制参数和候选点与理想曲线间的位置关系计算出精确距离,舍弃作用微小的高阶小量,利用查表或区间二分检索法转换为像素的亮度.该算法仅在中点法基础上进行局部调整,结构简单,且因为仅使用整数基本运算来实现,具有快速的光滑直线、圆和椭圆生成速度,有利于硬件实现.文中算法不仅实现了纯整数高质量快速曲线反走样绘制,也使得基本图形与反走样图形可以在一个框架下容易地生成.  相似文献   

2.
一种统一的硬件加速自适应EWA Splatting算法   总被引:2,自引:1,他引:1  
提出了一种新的硬件加速自适应EWA(椭圆加权平均)Splatting算法框架,可同时适用于三维体数据和点模型.算法将高斯重建核与低通图像滤波核结合,得到反走样、无模糊的高质量图像.提出一种高效的白适应滤波方法,减少了高质量EWA Splatting的计算量.提出了自适应体EWA Splatting的3种数据存储模式和一系列高级特性,其中包括交互式分类、体一面混合绘制策略和自适应浮点累加.展示了如何在可编程图形处理单元(GPU)中计算体数据和点模型数据的EWA Splat基元.实验表明,文中的方法在一台普通微机上每秒可绘制1500万~2000万个基元,达到较高的图像质量与交互的绘制速度.  相似文献   

3.
基于数据修正的实时阴影反走样算法   总被引:4,自引:1,他引:4  
基于百分比渐近滤波(PCF)算法,提出一种改进的实时阴影反走样算法——数据修正PCF算法,其主要思想是在双线性插值滤波前对插值的数据进行必要的修正,从而消除阴影中的一些锯齿形走样现象.该算法利用像素渲染器PS2.0在图形硬件上实现.从实例图片可以看出,文中算法产生的许多阴影边界走样现象得到了明显的改善.  相似文献   

4.
结合多边形扫描线填充算法,将Wu直线反走样算法的基本思想推广到三角形反走样中。同时提出了一种三角形顶点处反走样的处理方法,实现了对三角形绘制和反走样的全过程。最后,给出了算法实验结果分析及实际应用。  相似文献   

5.
针对显示器和打印机空间分辨率有限,在输出字符和其它参数图形时存在锯齿形边和细节丢失等走样现象,提出一种在图象空间利用模板匹配及拟合补偿的快速反走样算法。与现有物体空间类反走样算法相比,该算法具有可用于等分辨率光栅化参数图形、支持流水线并行处理机制、适宜低成本硬件实现等优点,且时空复杂度低,反走样效果理想。  相似文献   

6.
图形绘制在虚拟现实中占有很重要的地位,走样亦为图形绘制中的一关键技术。有序抖动算法是反走样技术的一种。介绍了有序抖动算法在CD漫游体光线追踪算法中的应用。  相似文献   

7.
本文设计了一种基于空间信息的交互式多维传递函数的纹理映射体绘制算法。该算法不仅可以根据体数据的强度而且还利用体素的空间位置来设定绘制的颜色和阻光度。通过采用一种独特的空间投影变换,根据用户需求,将体数据划分为不同区域,并分别定义各自的传递函数。该特点使得本文的算法可以有效地对体数据进行交互式分析。在算法实现中,利用了通用图形硬件的可编程特性,在普通PC上可以达到理想的绘制质量和交互速度。  相似文献   

8.
GPU在复杂场景的阴影绘制中的应用   总被引:4,自引:0,他引:4       下载免费PDF全文
通过有效利用图形硬件的图形处理单元(GPU)的运算能力和可编程性,将人量计算从CPU分离出来。在GPU上采用顶点和片元程序进行阴影计算,从而加速复杂场景阴影绘制。选择图像空间阴影算法进行GPU加速绘制。用Cg图形编程语言和OpenGL实现了算法的绘制过程,能够满足通用的复杂3D场景应用的需要,达到满意的实时绘制效果。  相似文献   

9.
反走样技术在计算机图形仿真中的运用   总被引:5,自引:0,他引:5  
阐述了反走样技术的基本原理和实现方法,重点描述了计算机图形中的直线反走样算法。该文采用的算法是基于三像素线宽的,通过调整像素的亮度来消除直线绘制中的锯齿现象。并把该算法推广到圆和椭圆的反走样。最后,采用改进的直线扫描转换算法与反走样算法相结合,进一步提高了反走样直线的绘制速度。该算法利用了直线的多段特性,以及空间对称特性。仿真表明,相比于Bresenham的算法,该算法的速度大为提高。  相似文献   

10.
反走样的整数算法   总被引:5,自引:0,他引:5  
反走样是计算机图形学及动画技术中的一个重要问题,本文利用Bresenham直线绘制算法来实现图形的反走样,由于只使用整数运算,所以执行速度非常快。  相似文献   

11.
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.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
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.  相似文献   

13.
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。  相似文献   

14.
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.  相似文献   

15.
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.  相似文献   

16.
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  相似文献   

17.
《计算机科学》2007,34(4):148-148
Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.  相似文献   

18.
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.  相似文献   

19.
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.  相似文献   

20.
正The 34th Chinese Control Conference and SICE Annual Conference 2015(CCCSICE2015)is organized by the Technical Committee on Control Theory(TCCT)of Chinese Association of Automation(CAA)and the Society of Instrument and Control Engineers(SICE)of Japan,and locally organized by Hangzhou Dianzi University(HDU).  相似文献   

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