Geometric computation theory for morphological filtering on freeform surfaces

Geometric computation theory for morphological filtering on freeform surfaces
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自由曲面形态滤波的几何计算理论

DOI:
10.1098/rspa.2013.0150
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发表时间:
2013
期刊:
Mathematical, Physical and Engineering Sciences
影响因子:
--
通讯作者:
Lou S
Lou S
中科院分区:
--
文献类型:
--
作者:
Lou S

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曲面决定着几何产品的功能行为,尤其是高精度、高附加值产品。与基于平均线的滤波器相比,形态滤波器是从传统E系统演变而来的,它与表面的功能性能相关。基于图像处理的形态滤波器的传统实现不适用于最先进的表面,例如自由形状表面。将α形状应用到计算中,发展了一套新颖的几何计算理论。采用分而治之的优化来加速 alpha 形状方法的计算性能并减少内存使用。为了摆脱α形状方法对Delaunay三角剖分的依赖,基于α形状理论提出了一套接触点搜索的定义和命题并进行了数学证明,它们适用于圆形和水平平面结构元素。所开发的方法通过实验进行了验证。
Surfaces govern functional behaviours of geometrical products, especially high-precision and high-added-value products. Compared with the mean line-based filters, morphological filters, evolved from the traditional E-system, are relevant to functional performance of surfaces. The conventional implementation of morphological filters based on image-processing does not work for state-of-the-art surfaces, for example, freeform surfaces. A set of novel geometric computation theory is developed by applying the alpha shape to the computation. Divide and conquer optimization is employed to speed up the computational performance of the alpha-shape method and reduce memory usage. To release the dependence of the alpha-shape method on the Delaunay triangulation, a set of definitions and propositions for the search of contact points is presented and mathematically proved based on alpha shape theory, which are applicable to both circular and horizontal flat structuring elements. The developed methods are verified through experimentation.
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