查询词典 triangulation

The main results in this paper as follows: First, a prototype of a shape-based image database retrieval system is completed, it can receive the query mode both by giving an example image and by sketching the desired object on the screen, Second, five shape-based image retrieval methods are realized; Third, an algorithm based on triangulation for shape-based image retrieval is brought forward. In this algorithm, firstly, the edge of the original image is followed and the candidate corners in the original image are detected. Then the counterpoints of the candidate corners in the result of edge follow are found, and the boundary corners whose counterpoints have been found are queued in the order of their counterpoints in edge follow. After these steps, the boundary corners are triangulated and triangles are obtained which can show the true shape of the original image. Finally, shape feature is obtained by calculating the angle histogram of the triangles.

同时本文中主要完成了以下三方面的工作：完成了一个基于形状特征的图象检索的原型系统，可实现例子图象或徒手绘草图两种查询方式；实现了五种利用形状特征进行图象检索的具体方法，并对其进行了分析比较；并且在继承将三角剖分引入形状检索的思想基础上提出了利用三角剖分进行形状检索的一种新算法：先对原图象进行边界跟踪和角点检测；然后寻找初始角点在边界跟踪中的对应点，并对找到对应点的角点按其对应点在边界跟踪中的顺序进行排序；再对排序后的角点进行德洛内三角剖分，得到能表示目标真实形状的三角形序列；最后计算三角形序列的角度直方图作为形状特征，并进行相似性匹配。

Triangulation, the practice of cross-checking findings with multiple data sources, is highly valued in qualitative research.

三角测量作为一种用大量数据对所得结果进行反复检查的方法在定性研究中非常有价值。

Six recurrent themes were identified: disengagement, intrafamilial conflict, triangulation, detouring triad, affective involvement and reciprocity.

研究结果发现，病患家庭在治疗过程中所呈现的生活经验有六个主题：疏离、家庭内在冲突、三角关系、迂回三角、情感投入及互惠。

Chapter 9 summarizes the work of the dissertation, points out the shortcoming of Delaunay triangulation and forecasts the griding technique of data field.

第九章对本文工作进行了总结，指出了Delaunay三角化中的不足之处，展望了数据场网格化技术的研究方向。

In chapter 7, the constrained Delaunay triangulation is applied to visualization of oil geological data and griding of mechanical part. Data field is displayed by color map, contour map and section.

第七章将约束Delaunay三角网格应用于石油地质勘探数据场的可视化和机械零件的网格剖分，用三维立体图、渐变色图、区域填充图、等值线图、剖面图显示数据场。

The wing-edge and wing-patch data structure and fast searching method which combines the index rectangle with compass based normal vector are designed to speed the triangulation algorithm. Application in visualization of oil geological data and griding of mechanical part, the algorithm is efficient, steady and broad-spectrum. It can provide Delaunay triangular mesh for scientific computing and engineering analysis.

算法中采用了翼边、翼面型数据结构和自行设计的索引矩形与基于法矢的指南针法相结合的快速查询法，在石油地质勘探数据场可视化和机械零件网格剖分中的应用表明本文三角化算法具有高效、稳定、适用范围广的特点，能够为科学计算和工程分析提供边界一致的Delaunay三角网格。

Stereo vision is a passive means for inferring three-dimensional structure and depth information from images, which is based on the triangulation principle.

立体视觉是一种被动的三维信息获取方式，它是基于三角法测量原理的。

The region enclosed by a constrained surface is divided into some of constrained maximum empty-sphere convex polyhedrons,the triangulation is followed inside these polyhedrons.

而由空间物体的一组平行截面线重建物体的三维表面则在医学图像和地理信息系统等领域有着广泛的应用。

An experimental result is included to show surface reconstruction from scatted data is better and the triangulation keeps topology consistency .

结果表明：重构的结果较好，且三角剖分的拓扑保持一致。

Two ways to measure stability of tetrahedrons will be introduced. An earlier method to improve tetrahedron stability, the Snap Method, will be briefly discussed. Then techniques used in Delaunay. triangulation to deal with degenerated elements will bethoroughly investigated.

本文引入了两种单元质量的描述方法，简单介绍了已有的提高四面体稳定性方法之一—投射法；然后介绍了Delaunay方法中使用较广泛的逐点插入法的核心思想，将Delaunay网格构造法中处理退化单元的方法；删除法和换面法，改造后应用于四面体稳定性的提高上。

We are forbidden from giving money to these shoeless, skinny children, as this will perpetuate begging.

向光着脚，骨瘦如柴的孩子施舍是不可以的，因为要招来无休无止的乞讨。

It would be hard not to fall victim to some sharpeyed policeman.

要想不被某个目光锐利的警察抓到，谈何容易。