在各种图形中，通过提取点的凹凸部分来鉴别曲线的特征，本节代码利用曲率关系分别提取凹点的个数，判断曲线的弯曲-In a variety of graphics, through the extraction point to identify curves convex-concave part of the characteristics of the code used in this section were extracted from concave curvature of the r

获得点位坐标，在图像中点击相应的点，就可以得到该点的坐标等信息。-To obtain the coordinates of the point and click on the corresponding point in the image, you can get information such as the coordinates of the point.