Compared with traditional DEM or TIN based methods, this pure vector approach obtains not only the topological structure of drainage system in planar graph, but also the valley distribution polygon range. Depending on geometrical computation and judgment of vector line, polygon, the structured properties in drainage representation is enhanced, avoiding the case of noise disturbance in DEM based method. The core algorithm makes use of the ability of Delaunay triangulation in detecting hierarchical structure of each contour line.

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Basing on the concepts and algorithms, some traditional algorithms, e.g. Delaunay triangulation for planar polygonal domain, constrained Delaunay triangulation for planar points and Delaunay tetrahedralization for spatial points, are improved.

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A new triangulation algorithm based on Delaunay triangulation and the advantage of simplicity and rapidness of advancing front method is constructed.

將推進(jìn)波前法的實(shí)現(xiàn)簡(jiǎn)單和快速的特性引入到Delaunay三角剖分法之中，構(gòu)建一種基于Delaunay三角剖分的算法午夜免费看片网站。

Delaunay triangulation has been used to partition the selected extrema, then replaces the pixels that not contained in the Delaunay polygon through symmetry principle, which can restrain the variance phenomenon that appeared in the cubic spline interpolation.

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Edges are first detected in the original image and then cut equidistantly into some segmentations, and the end points of segmentations are gathered into a points set. A constrained Delaunay triangulation is yielded from the points set and then a graph is attained too.

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Because Delaunay triangle is nearly equilateral triangle, modeling reseau with the method of Delaunay will be relatively well-proportioned. The whole image will looks shapely, not snatchy and inaccurate.

使用Delaunay方法來建模黄色网站在线观看的，由于Delaunay三角是盡量接近于等邊三角形的，所以用這種方法建的網(wǎng)格會(huì)比較均勻66J8在线视频免费看，顯示圖像的時(shí)候視覺效果就是整個(gè)圖像很勻稱日韩精品国语在线观看视频免费，不會(huì)出現(xiàn)粗細(xì)不均或者漏洞百出的情況。

Because Delaunay triangle is nearly equilateral triangle, modeling reseau with the method of Delaunay will be relatively well-proportioned. The whole image will looks shapely, not snatchy and inaccurate.

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The paper applies Delaunay triangulation to branching problem according to characteristics of the Delaunay triangula- tion of constrained edge point sets,moreover,mends and implements a branching problem algorithm.

根據(jù)平面點(diǎn)集Delaunay三角剖分的特性，將Delaunay三角剖分應(yīng)用到分支問題上狼友视频在线在线，改進(jìn)和實(shí)現(xiàn)了一種分支問題處理算法亚洲免费视频网。

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.

本文引入了兩種單元質(zhì)量的描述方法，簡(jiǎn)單介紹了已有的提高四面體穩(wěn)定性方法之一—投射法毛片A片全免费观看；然后介紹了Delaunay方法中使用較廣泛的逐點(diǎn)插入法的核心思想白白发布精品免费视频看看，將Delaunay網(wǎng)格構(gòu)造法中處理退化單元的方法；刪除法和換面法国产理论一区，改造后應(yīng)用于四面體穩(wěn)定性的提高上最近中文字幕完整视频免费。

This method can effectively reduce the numbers of artificial dams and local minima.The algorithm has been implemented in five different terrains,showing that the method can effectively reduce the numbers of the local minima.So,it is more realistic for generating terrains model with higher order Delaunay triangulations.

實(shí)驗(yàn)結(jié)果表明色哟哟色院91精品网站，高階Delaunay三角網(wǎng)能夠有效地減少地形中局部極小的數(shù)量，因此欧美纯码黄视频，采用高階Delaunay三角網(wǎng)建立的地形模型更接近于實(shí)際地形A爱片免费视频。