项目需求：要求圆环外圈毛刺的凸出高度不得超过20像素，如超过判为NG。
算法分析：按照一般的思路，应该是先将外圈拟合成一个圆；然后将这个工件阈值化，提取工件区域；然后用该区域减去之前拟合的圆，剩下的区域就是毛刺部分了。那么什么样特征的毛刺算超标的呢？很显然，如果仅仅用'area'、'inner_radius'等参数去筛选，至少从原理上来看，是不完全契合项目需求的。
具体完整算法如下：
1 read_image (Image, 'C:/Users/02/Desktop/Ring.png') 2 dev_set_draw ('margin') 3 threshold (Image, Region, 0, 253) 4 fill_up_shape (Region, RegionFillUp, 'area', 1, 20000) 5 fill_up (RegionFillUp, RegionFillUp1) 6 difference (RegionFillUp1, RegionFillUp, CircleInner) 7 smallest_circle (CircleInner, Row, Column, Radius) 8 find_circle (Image, PartCircleXLD, Regions, Cross, Circle, Row, Column, Radius + 100, 0, 360, 40, 100, 20, 1, 40, 'negative', 'first', 'inner', 10, 'circle', RowCenter, ColCenter, Radius1) 9 gen_region_contour_xld (Circle, RegionCircle, 'filled') 10
11 *稍微膨胀一下，便于后续处理 12 dilation_circle (RegionCircle, RegionCircle, 1.5) 13 difference (RegionFillUp, RegionCircle,RegionDifference) 14 opening_circle (RegionDifference, RegionDifference, 3.5) 15 connection (RegionDifference, ConnectedRegions) 16 select_shape (ConnectedRegions, SelectedRegions, 'area', 'and', 50, 9999999) 17 count_obj (SelectedRegions, Number) 18
19 *后面精确测量一下多出的毛刺是否超标 20 gen_empty_obj (RegionDefects) 21 if (Number >0) 22 for i := 1 to Number by 1
23 select_obj (SelectedRegions, ObjectSelected, i) 24 distance_pr (ObjectSelected, RowCenter, ColCenter, DistanceMin, DistanceMax) 25 *如果毛刺凸出高度超过20像素，则判断超标 26 if (DistanceMax - Radius1 > 20) 27 concat_obj (RegionDefects, ObjectSelected, RegionDefects) 28 endif 29 endfor 30 endif 31
32 dev_display (Image) 33 dev_display (RegionDefects) 34 disp_cross (3600, RowCenter, ColCenter, 20, 0.45)
与程序中的抓圆函数find_circle相关的函数，可以从这里下载：
https://files.cnblogs.com/files/xh6300/find_line_find_circle.zip