首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   10篇
  完全免费   3篇
  自动化技术   13篇
  2011年   1篇
  2010年   2篇
  2009年   1篇
  2007年   3篇
  2006年   1篇
  2003年   3篇
  2002年   1篇
  1998年   1篇
排序方式: 共有13条查询结果,搜索用时 46 毫秒
1.
基于广义元球的一般约束变形   总被引:4,自引:0,他引:4       下载免费PDF全文
金小刚  彭群生 《软件学报》1998,9(9):677-682
在计算机动画和形状设计中,变形是一个非常重要的工具.基于广义元球所具有的特殊势函数分布,提出了一个新的包含点、线、面和体约束的一般变形模型.用户定义一系列约束、每个约束的影响半径和偏移量,变形模型根据每个约束和其影响半径产生该约束的广义元球.广义元球确定了一个以约束点集为中心的势函数,该势函数在约束点集处为1,在影响半径处渐变为0.模型直接对整个空间进行变形,而与物体的表示无关,并且变形可由偏移量和广义元球的参数来细微调整.实验表明,该一般约束变形模型不仅有效,而且使传统方法难以做到的线、面、体约束变形成  相似文献
2.
约束双圆弧插值   总被引:2,自引:0,他引:2  
提出一种构造C-型双圆弧和S-型双圆弧的算法,该双圆弧的2个端点为给定的点,在端点处的2个切向量为给定的切向量,且完全位于一条给定直线的一侧.对于C-型双圆弧,分12种情况给出不等式直接判断双圆弧是否满足位于给定直线一侧的约束条件.如果存在多个同时满足插值条件和直线约束条件的双圆弧,则通过求解一个最小值问题选出最优的双圆弧;否则,通过添加一个额外的点构造2段双圆弧.对于S-型双圆弧也给出一些带直线约束的插值结果.  相似文献
3.
Approaches for Constrained Parametric Curve Interpolation   总被引:1,自引:0,他引:1       下载免费PDF全文
The construction of a GCx cubic interpolating curve that lies on the same side of a given straight line as the data points is studied. The main task is to choose appropriate approaches to modify tangent vectors at the data points for the desired curve. Three types of approaches for changing the magnitudes of the tangent vectors axe presented. The first-type approach modifies the tangent vectors by applying a constraint to the curve segment. The second one does the work by optimization techniques. The third one is a modification of the existing method. Three criteria are presented to compare the three types of approaches with the existing method. The experiments that test the effectiveness of the approaches are included.  相似文献
4.
一种新的用于立体图像编码的视差估计算法   总被引:1,自引:0,他引:1  
韩军功  卢朝阳 《计算机学报》2003,26(12):1717-1721
视差估计是立体视觉和立体图像编码领域的研究重点,其估计的准确程度直接影响编码的精度和效率.该文在研究传统估计算法的基础上,提出了一种新的带极线约束的DT基立体图像视差估计算法.该算法首先把立体图像中的左图像作为参考图像,用DT网格进行描述.然后,利用极线约束条件在右图像中估计出各三角形顶点的对应点,整个估计过程要求DT结构保持不变.通过估计出来的对应点计算出这些顶点的视差矢量,再用六参数仿射变换估计出三角形内部各点的视差矢量.编码时,只需编码各顶点的视差矢量.从实验结果看,这种新算法同传统的“块”匹配视差估计算法相比,视差矢量的估计更加准确,视差图中主要物体的轮廓更加清晰,有利于进一步的物体分割.  相似文献
5.
This paper presents a new automated method of quadrilateral meshes with random line constraints which have not been fully considered in previous models. The authors developed a new looping scheme and a direct quadrilateral forming algorithm based on advanced front techniques. This generator overcomes the limitations of previous studies such as line constraint, unmeshed hole and mesh refinement. A qualitative test reveals that our algorithm is reliable and suitable at the field needed for very accurate results. The developed direct method to handle line-typed features automatically makes the multiple discretizations without any user interaction and modification.  相似文献
6.
基于图像相关性信息,从系统层面提出了一种图像融合算法.该算法充分考虑到视频传感器节点的有限资源及相邻节点间冗余视觉信息,将同一场景的视觉监测任务分配到相关度较大的2个视频传感器节点上,每个视频传感器节点仅负责传输一部分视觉场景信息.特别地,利用极线约束性质融合多路传输来的部分图像信息,最终实现场景视觉信息的重建.实验结果表明:该算法简单易行,既可以减少网络传输量、节约网络能量,又可以实现场景视觉信息的有效监测.  相似文献
7.
Finite element method (FEM) is a fundamental numerical analysis technique widely used in engineering applications. Although state-of-the-art hardware has reduced the solving time, which accounts for a small portion of the overall FEM analysis time, the relative time needed to build mesh models has been increasing. In particular, mesh models that must model stiffeners, those features that are attached to the plate in a ship structure, are imposed with line constraints and other constraints such as holes. To automatically generate a 2D quadrilateral mesh with the line constraints, an extended algorithm to handle line constraints is proposed based on the constrained Delaunay triangulation and Q-Morph algorithm. The performance of the proposed algorithm is evaluated, and numerical results of our proposed algorithm are presented.  相似文献
8.
§1.引 言 考虑线性约束优化问题:min.f(x)s.t. aiTx=bi,i∈E,(1.1)aiTx≥bi,i∈I,其中f(x)是可行域X={x∈Rn|aiTx=bi,i∈E;aiTx≥bi,i∈I}上的连续可微函数. 多年来,问题(1.1)一直受到许多研究人员的广泛注意,相继提出了有效集方法、投影梯度法[1,2]等.特别是近几年来,信赖域方法因具有强适性、强收敛性受到更多的重视[3,8,11,12],这些方法都具有一个共同的性质:下降性,即要求在迭代点,目标函数值严格单调下降,放  相似文献
9.
Due to increases in personal computer power and available bandwidths, 3D worlds are becoming increasingly accessible over the Internet, allowing viewers to freely explore virtual constructed worlds. However, even with advances in computing power and bandwidths, creating realistic 3D worlds which are fast downloading and are pleasurable to navigate around requires a number of design techniques to be employed. The aim of this paper is to describe the design techniques used in a redesign of a web-based virtual reality reconstruction of an historical site describing how different techniques can be used to optimise download times yet retain historical realism. The techniques and processes can be used as a guide by any designer to help create lightweight realistic virtual models.  相似文献
10.
提出一种非量测数码相机标定的直接方法。该方法基于直线约束条件,即在正确进行畸变纠正后,物方空间的三维直线投影到像片平面上也应该是一条直线。为了将畸变直线纠正成理想直线,利用畸变模型对其进行畸变纠正,并采用Levenberg-Marquardt算法对非线性方程组进行求解,解出符合条件的最佳畸变参数。实验结果证明该方法具有较强的鲁棒性与实用性。  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号