Based on the binarization of acquired image of diamond grits, the contour of projective region was extracted and afterwards smoothed by averaging the coordinate values of 5 neighboring points.

• 在对采集到的金刚石颗粒图像二值化的基础上，首先提取金刚石颗粒图像的轮廓，获取轮廓坐标序列并采用五点平均法对轮廓坐标序列进行了平滑；