评估圆形度、椭圆短长轴比、图斑与外接矩形面积比、等面积圆周长与图斑周长比、凸包周长与图斑周长比等5个形状特征，选出用于对灰度图像G形状分割时的最佳指标组合。-Assessment roundness, oval short major axis ratio of the circumscribed rectangular polygon area ratio, etc. polygon area and perimeter circumference ratio, convex hull shape features five perimeter polygon perimeter ratio, elected for a combination of the best indicators of gray image segmentation when G shape.