求助大神如何识别零件腔体中心

如图“识别示例”，需要获取到图像中的红色的四条腔体外边界，从而获取两条对边的中心线，最终获取到中心点，需要输出中心坐标，及垂直方向的角度偏差。

1. read_image (Image, 'C:/Users/Administrator/Desktop/腔体图像.png')
   
2. rgb1_to_gray(Image,ImageGray)
   
3. create_metrology_model(MetrologyHandle)
   
4. typeName := ['min_score','measure_select','measure_transition']
   
5. value := [0,'last', 'positive']
   
6. value2 := [0,'first', 'negative']
   
7. ***L1
   
8. ROIl1 := [ 366.801, 659.756, 367.972, 525.184]
   
9. add_metrology_object_line_measure (MetrologyHandle, ROIl1[0], ROIl1[1], ROIl1[2], ROIl1[3],\
   
10.                                    50, 5, 1, 30, typeName, value, IndexL1)
    
11. ***L2
    
12. ROIl2 := [ 557.096, 721.389, 422.423, 721.389]
    
13. add_metrology_object_line_measure (MetrologyHandle, ROIl2[0], ROIl2[1], ROIl2[2], ROIl2[3],\
    
14.                                    10, 5, 1, 30, typeName, value, IndexL2)
    
15. ***L3
    
16. 
    
17. ROIl3 := [790.461, 586.594, 790.461, 508.831]
    
18. add_metrology_object_line_measure (MetrologyHandle, ROIl3[0], ROIl3[1], ROIl3[2], ROIl3[3],\
    
19.                                    50, 5, 1, 30, typeName, value2, IndexL3)
    
20. ***L4
    
21. ROIl4 := [ 636.511, 477.395, 499.116, 475.74]
    
22. add_metrology_object_line_measure (MetrologyHandle, ROIl4[0], ROIl4[1], ROIl4[2], ROIl4[3],\
    
23.                                    50, 5, 1, 30, typeName, value2, IndexL4)
    
24. 
    
25. ***卡尺检测
    
26. apply_metrology_model (Image, MetrologyHandle)
    
27. **L1
    
28. get_metrology_object_result (MetrologyHandle, IndexL1, 'all', 'result_type', 'all_param',LineL1)
    
29. get_metrology_object_result_contour (ContourOutL1, MetrologyHandle, IndexL1, 'all', 1.5)
    
30. **L2
    
31. get_metrology_object_result (MetrologyHandle, IndexL2, 'all', 'result_type', 'all_param',LineL2)
    
32. get_metrology_object_result_contour (ContourOutL2, MetrologyHandle, IndexL2, 'all', 1.5)
    
33. **L3
    
34. get_metrology_object_result (MetrologyHandle, IndexL3, 'all', 'result_type', 'all_param',LineL3)
    
35. get_metrology_object_result_contour (ContourOutL3, MetrologyHandle, IndexL3, 'all', 1.5)
    
36. **L4
    
37. get_metrology_object_result (MetrologyHandle, IndexL4, 'all', 'result_type', 'all_param',LineL4)
    
38. get_metrology_object_result_contour (ContourOutL4, MetrologyHandle, IndexL4, 'all', 1.5)
    
39. 
    
40. **左上点
    
41. intersection_lines(LineL1[0], LineL1[1], LineL1[2], LineL1[3], LineL4[0], LineL4[1], LineL4[2], LineL4[3], Rowlu, Columnlu, IsOverlapping)
    
42. **右上点
    
43. intersection_lines(LineL1[0], LineL1[1], LineL1[2], LineL1[3], LineL2[0], LineL2[1], LineL2[2], LineL2[3], Rowru, Columnru, IsOverlapping)
    
44. **右下点
    
45. intersection_lines(LineL2[0], LineL2[1], LineL2[2], LineL2[3], LineL3[0], LineL3[1], LineL3[2], LineL3[3], Rowrd, Columnrd, IsOverlapping)
    
46. **左下点
    
47. intersection_lines(LineL3[0], LineL3[1], LineL3[2], LineL3[3], LineL4[0], LineL4[1], LineL4[2], LineL4[3], Rowld, Columnld, IsOverlapping)
    
48. **左中点
    
49. lineLx := (Columnlu + Columnld)/2
    
50. lineLy := (Rowlu + Rowld)/2
    
51. **上中点
    
52. lineUx := (Columnlu + Columnru)/2
    
53. lineUy := (Rowlu + Rowru)/2
    
54. **右中点
    
55. lineRx := (Columnru + Columnrd)/2
    
56. lineRy := (Rowru + Rowrd)/2
    
57. **下中点
    
58. lineDx := (Columnld + Columnrd)/2
    
59. lineDy := (Rowrd + Rowld)/2
    
60. dev_get_window (WindowHandle)
    
61. disp_line(WindowHandle,lineLy, lineLx, lineRy, lineRx)
    
62. disp_line(WindowHandle,lineUy, lineUx, lineDy, lineDx)
    
63. 
    
64. ****中心点
    
65. intersection_lines(lineLy, lineLx, lineRy, lineRx, lineUy, lineUx, lineDy, lineDx, CenterX,CenterY, IsOverlapping)
    
66. angle_lx (lineUy, lineUx, lineDy, lineDx, Angle)
    

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卡尺求完4条直线再求中心和角度就行了