arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.13236math.DGcs.GRcs.NAmath.NA
收藏

由交比求离散曲率和挠率

Discrete Curvature and Torsion from Cross-Ratios

Christian Müller, Amir Vaxman

摘要:

出于莫比乌斯不变的多边形细分方案,我们研究了离散曲线的曲率概念,其中交比在我们所有的关键定义中起着重要的作用。使用一个特定的莫比乌斯不变的点插入规则,相当于经典的四点计划,我们沿着离散曲线构造圆。渐近分析表明,随着采样密度的增加,定义在采样曲线上的这些圆收敛到光滑曲率圆。我们表示我们的离散挠空间曲线,这是不是一个莫比乌斯不变的概念,使用交比,并显示其渐近行为类似的曲率。

英文摘要:

Motivated by a Möbius invariant subdivision scheme for polygons, we study a curvature notion for discrete curves where the cross-ratio plays an important role in all our key definitions. Using a particular Möbius invariant point-insertion-rule, comparable to the classical four-point-scheme, we construct circles along discrete curves. Asymptotic analysis shows that these circles defined on a sampled curve converge to the smooth curvature circles as the sampling density increases. We express our discrete torsion for space curves, which is not a Möbius invariant notion, using the cross-ratio and show its asymptotic behavior in analogy to the curvature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑