In zero-set method the first step is to measure the background light and then set the output voltage of the detector 's each quadrant to zero .

测 零法是先对背景光进行测量，然后将探测器每个象限的输出电压调零。

Following the parts of Delaunay triangulation optimal criterions and algorithms it shows and compares the triangle mesh surface reconstruction methods including zero-set method α - shape method and Crust algorithm .

包括Delaunay三角剖分的优化准则，发展 现状及相关的算法。在此 基础 之上对曲面重建中的三角网格曲面模型 生成的算法 零 集 法，α -shape法和Crust算法进行了详细的讨论和比较。

But the errors are large between the actual surface and the reconstructed one by Zero-Set algorithm . And the memory space required by the interpolation mesh surfaces by a - shape and Voronoi algorithms is rather big .

不过， 零 集法 生成 的 近似曲面和真实曲面之间存在较大的误差，而 α -shape 法和Voronoi法生成插值网格曲面的网格 密度大，所需存储空间大；