halcon示例程序学习：<fin>

该样例主要功能是检测一个鱼鳍状的特征区域，如下图：

原码

 1 * fin.hdev: Detection of a fin
 2 * 
 3 dev_update_window ('off')
 4 read_image (Fin, 'fin1')
 5 get_image_size (Fin, Width, Height)
 6 dev_close_window ()
 7 dev_open_window (0, 0, Width, Height, 'black', WindowID)
 8 dev_display (Fin)
 9 set_display_font (WindowID, 14, 'mono', 'true', 'false')
10 disp_continue_message (WindowID, 'black', 'true')
11 stop ()
12 * read_image (Fin, 'fin2')
13 * read_image (Fin, 'fin3')
14 bin_threshold (Fin, Dark)
15 difference (Fin, Dark, Background)
16 dev_set_color ('blue')
17 dev_set_draw ('margin')
18 dev_set_line_width (4)
19 dev_display (Background)
20 disp_continue_message (WindowID, 'black', 'true')
21 stop ()
22 closing_circle (Background, ClosedBackground, 250)
23 dev_set_color ('green')
24 dev_display (ClosedBackground)
25 disp_continue_message (WindowID, 'black', 'true')
26 stop ()
27 difference (ClosedBackground, Background, RegionDifference)
28 opening_rectangle1 (RegionDifference, FinRegion, 5, 5)
29 dev_display (Fin)
30 dev_set_color ('red')
31 dev_display (FinRegion)
32 area_center (FinRegion, FinArea, Row, Column)
33 dev_set_draw ('fill')
34 dev_set_line_width (1)
35 dev_update_window ('on')
36 disp_continue_message (WindowID, 'black', 'true')
37 stop ()
38 dev_close_window ()

核心算子

1. bin_threshold (Fin, Dark)  //对单通道图像进行自动二值化，阈值根据图像灰度值分布自动确定。输出为暗区域。
   

2. difference (Fin, Dark, Background)  //比较两个区域，输入不同的部分。

3. bin_threshold (Fin, Dark)  //对单通道图像进行自动二值化，阈值根据图像灰度值分布自动确定。输出为暗区域。

4. closing_circle (Background, ClosedBackground, 250) //对区域的边缘进行平滑处理，边缘上小于参数中半径的坑洞都会被填平。

5. opening_rectangle1 (RegionDifference, FinRegion, 5, 5) //按照参数里设置的宽和高，大的区域保留，小的区域过滤掉。

 图像变量