对一幅二维图像的给定的边界提取其相应的信息，如其质心等信息-The given boundary of a two-dimensional image to extract the appropriate information, such as if the centroid information

图像特征分析实例，包括轮廓跟踪、边界检测、消除小洞、计算形心、计算不变矩、细化算法等。-Examples include image feature analysis, contour tracking, edge detection and elimination of small hole, calculate the centroid, moment invariants, thinning calculation.