光度立体视觉缺陷检测

Halcom

光度立体视觉缺陷检测：
halcon12 + win32
例如：四个角度，各拍摄一张图，供4张图，然后进行光度立体视觉缺陷检测，

1. read_image (Images, 'photometric_stereo/blister_back_0' + [1:4])
   
2. for I := 1 to 4 by 1
   
3.     Message := 'Acquire image ' + I + ' of 4'
   
4.     select_obj (Images, ObjectSelected, I)
   
5.     dev_display (ObjectSelected)
   
6.     disp_message (WindowHandle, Message, 'window', 12, 12, 'black', 'true')
   
7.     wait_seconds (0.5)
   
8. endfor
   
9. *
   
10. * Apply photometric stereo to determine the albedo and the surface gradient.
    
11. Tilts := [6.1,95.0,-176.1,-86.8]   
    
12. Slants := [41.4,42.6,41.7,40.9]
    
13. ResultType := ['gradient','albedo']
    
14. photometric_stereo (Images, HeightField, Gradient, Albedo, Slants, Tilts, ResultType, 'poisson', [], [])
    
15. *
    
16. * Display the albedo image
    
17. dev_display (Albedo)
    
18. stop ()
    
19. *
    
20. * Calculate the gaussian curvature of the surface
    
21. * using the gradient field as input for the operator
    
22. * derivate_vector_field.
    
23. * Defects are usually easy to detect in the curvature image.
    
24. derivate_vector_field (Gradient, GaussCurvature, 1, 'gauss_curvature')
    
25. *
    
26. * Detect defects
    
27. *
    
28. * Segment the tablet areas in the curvature image
    
29. regiongrowing (GaussCurvature, Regions, 1, 1, 0.001, 250)
    
30. select_shape (Regions, TabletRegions, ['width','height'], 'and', [150,150], [200,200])
    
31. shape_trans (TabletRegions, TabletRegions, 'convex')
    
32. union1 (TabletRegions, TabletRegions)
    
33. erosion_circle (TabletRegions, TabletRegions, 3.5)
    
34. * Search for defects inside the tablet areas
    
35. reduce_domain (GaussCurvature, TabletRegions, ImageReduced)
    
36. abs_image (ImageReduced, ImageAbs)
    
37. threshold (ImageAbs, Region, 0.03, 255)
    
38. closing_circle (Region, RegionClosing, 10.5)
    
39. connection (RegionClosing, ConnectedRegions)
    
40. select_shape (ConnectedRegions, Defects, 'area', 'and', 10, 99999)
    
41. area_center (Defects, Area, Row, Column)
    
42. gen_circle (Circle, Row, Column, gen_tuple_const(|Row|,20.5))
    
43. * Display the defects in curvature image
    
44. dev_set_draw ('margin')
    
45. dev_display (Albedo)
    
46. dev_display (Circle)
    
47. disp_message (WindowHandle, 'Defect in albedo image', 'window', 12, 12, 'black', 'true')

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参考：
【1】检测效果：https://tieba.baidu.com/p/1712630404?red_tag=2883704820
【2】论文：https://wenku.baidu.com/view/564 ... 25.html?from=search