尺度各异刚体碎块断裂面的匹配方法

A Matching Method Based on Fracture Surface for Rigid Blocks with Different Scale

针对厚度不可忽略的刚体碎块,提出一种尺度刚体碎块匹配方法,以解决碎块匹配中的刚体变换和尺度变换的问题.采用改进的区域生长算法对碎块的外表面进行分割,并根据曲面的粗糙程度提取碎块的断裂面;通过添加尺度矩阵、旋转角约束和动态迭代系数的方式来改进迭代最近点(iterative closest point,ICP)算法,并采用该改进的ICP算法实现碎块的断裂面匹配.实验结果表明,跟ICP算法相比,改进的ICP算法不仅能够克服ICP算法不能解决的尺度变换问题,而且与尺度ICP(SICP)算法相比,可以更加精确、快速地实现碎块的断裂面匹配.

Aiming at rigid blocks with a certain thickness,a scaling rigid block matching method was proposed to solve the problems of rigid transformation and scale transformation in block matching process.At first,the surface of each block was segmented by an improved region growing algorithm,and the fracture surfaces of the block were extracted according to its roughness.Then,an improved iterative closest point(ICP)algorithm was proposed by integrating scale matrix,rotation angle constraint and active iterative coefficient to ICP algorithm.Finally,the improved ICP algorithm was used to complete fracture surfaces matching of rigid blocks.The experimental results show that,compared with ICP algorithm,the improved ICP algorithm can overcome the problem of scaling transformation;And compared with scaling ICP(SICP)algorithm,the improved ICP algorithm can get much higher accuracy and convergence rate in fracture surface matching process.