HALCON示例程序measure_circles.hdev测量圆的半径

示例程序源码（加注释）

关于显示类函数解释
dev_update_off ()
read_image (Image, ‘circle_plate’)
get_image_size (Image, Width, Height)
dev_close_window ()
dev_open_window (0, 0, Width / 2, Height / 2, ‘light gray’, WindowID)
dev_set_part (0, 0, Height - 1, Width - 1)
dev_set_line_width (3)
dev_set_color (‘white’)
dev_set_draw (‘margin’)
dev_display (Image)
set_display_font (WindowID, 14, ‘mono’, ‘true’, ‘false’)
disp_continue_message (WindowID, ‘black’, ‘true’)
stop ()
dev_set_colored (12)
dev_set_line_width (2)
dev_set_draw (‘fill’)
快速阈值分割，分割连通域，使用面积进行区域筛选，快速筛选出测量区域。
fast_threshold (Image, Region, 200, 255, 20)
connection (Region, ConnectedRegions)
select_shape (ConnectedRegions, SelectedRegions, ‘area’, ‘and’, 70, 50000)
dev_display (Image)
dev_display (SelectedRegions)
disp_continue_message (WindowID, ‘black’, ‘true’)
stop ()
求取边缘，膨胀，缩减定义域，求取边缘，分割边缘，筛选边缘
boundary (SelectedRegions, RegionBorder, ‘inner_filled’)
dilation_circle (RegionBorder, RegionDilation, 3.5)
union1 (RegionDilation, RegionUnion)
reduce_domain (Image, RegionUnion, ImageReduced)
dev_clear_window ()
dev_display (ImageReduced)
disp_continue_message (WindowID, ‘black’, ‘true’)
stop ()
edges_sub_pix (ImageReduced, Edges, ‘canny’, 1.5, 10, 40)
segment_contours_xld (Edges, ContoursSplit, ‘lines_circles’, 5, 2, 2)
select_contours_xld (ContoursSplit, SelectedContours, ‘contour_length’, 25, 99999, -0.5, 0.5)
count_obj (SelectedContours, NumberContours)
gen_empty_obj (Circles)
for i := 1 to NumberContours by 1
select_obj (SelectedContours, ObjectSelected, i)
- get_contour_global_attrib_xld - 返回XLD轮廓的全局属性值。cont_approx是椭圆还是圆形？
- get_contour_global_attrib_xld（轮廓::属性：属性值）
  get_contour_global_attrib_xld (ObjectSelected, ‘cont_approx’, Attrib)
  if (Attrib == 1)
  concat_obj (Circles, ObjectSelected, Circles)
  endif
结束循环
endfor
合并属于一个圆形的轮廓
union_cocircular_contours_xld (Circles, UnionContours, rad(60), rad(10), rad(30), 100, 50, 10, ‘true’, 1)
dev_clear_window ()
dev_set_color (‘black’)
dev_display (UnionContours)
disp_continue_message (WindowID, ‘black’, ‘true’)
stop ()
count_obj (UnionContours, NumberCircles)
CenterRow := []
CenterColumn := []
dev_clear_window ()
dev_set_color (‘black’)
set_display_font (WindowID, 12, ‘mono’, ‘true’, ‘false’)
dev_display (SelectedContours)

for i := 1 to NumberCircles by 1
select_obj (UnionContours, ObjectSelected, i)
* 拟合圆形
fit_circle_contour_xld (ObjectSelected, ‘algebraic’, -1, 0, 0, 3, 2, Row, Column, Radius, StartPhi, EndPhi, PointOrder)
gen_circle_contour_xld (ContCircle, Row, Column, Radius, 0, rad(360), ‘positive’, 1.5)
dev_set_color (‘white’)
dev_display (ContCircle)
if (i == 1)
Row2 := Row + Radius * sin(rad(-45))
Column2 := Column + Radius * cos(rad(-45))
set_tposition (WindowID, Row2 - 35, Column2 + 5)
endif
if (i > 1)
exist := 0
for j := 0 to i - 2 by 1
distance_pp (Row, Column, CenterRow[j], CenterColumn[j], DistanceCenters)
if (DistanceCenters < 20)
exist := 1
endif
endfor
if (exist == 1)
Row2 := Row + Radius * sin(rad(-135))
Column2 := Column + Radius * cos(rad(-135))
set_tposition (WindowID, Row2 - 40, Column2 - 30)
else
Row2 := Row + Radius * sin(rad(-45))
Column2 := Column + Radius * cos(rad(-45))
set_tposition (WindowID, Row2 - 35, Column2 + 5)
endif
endif
disp_arrow (WindowID, Row, Column, Row2, Column2, 2)
write_string (WindowID, i)
if (i < 8)
disp_message (WindowID, ‘R’ + i + ’ = ’ + Radius′.4′,′window′,i∗20,130,′black′,′false′)elsedispmessage(WindowID,′R′+i+′=′+Radius'.4', 'window', i * 20, 130, 'black', 'false') else disp_message (WindowID, 'R' + i + ' = ' + Radius′.4′,′window′,i∗20,130,′black′,′false′)elsedispmessage(WindowID,′R′+i+′=′+Radius’.4’, ‘window’, (i - 7) * 20, 400, ‘black’, ‘false’)
endif
CenterRow := [CenterRow,Row]
CenterColumn := [CenterColumn,Column]
endfor
dev_update_window (‘on’)

处理思路

这个例子是主要讲解了distance_transform算子的应用。

后记
大家有什么问题可以向我提问哈，我看到了第一时间回复，希望在学习的路上多多结交良师益友。