计算离散的frechet 距离，通过计算两条曲线之间的点的距离，将两条曲线上的点按照距离以及曲线的趋势进行配对，最后根据这些配对的距离选出最后的离散frechet距离-compute discrete frechet distance between two curves

基于matlab的RANSAC算法，主要用来拟合二维直线，同时选出非直线的点用于后续曲线拟合。(The RANSAC algorithm based on MATLAB is used to fit two dimensional lines, and the point of non straight line is selected for the subsequent curve fitting.)