弧形字符识别

像这种圆环只有四分之一的情况，上面的字符怎么去识别呢？

1. read_image (Image20240123135334, 'C:/Users/Administrator/Desktop/2024-01-23_135334.png')
   
2. get_image_size (Image20240123135334, Width, Height)
   
3. threshold (Image20240123135334, Region, 128, 255)
   
4. connection (Region, ConnectedRegions)
   
5. select_shape (ConnectedRegions, SelectedRegions, 'area', 'and', 40000, 50000)
   
6. fill_up (SelectedRegions, RegionFillUp)
   
7. dilation_circle (RegionFillUp, RegionDilation, 14.5)
   
8. erosion_circle (RegionFillUp, RegionErosion, 7.5)
   
9. difference (RegionDilation, RegionErosion, RegionDifference)
   
10. reduce_domain (Image20240123135334, RegionDifference, ImageReduced)
    
11. edges_sub_pix (ImageReduced, Edges, 'canny', 1, 20, 40)
    
12. select_contours_xld (Edges, SelectedContours, 'contour_length', 400, 1000, -0.5, 0.5)
    
13. sort_contours_xld (SelectedContours, SortedContours, 'upper_left', 'true', 'row')
    
14. select_obj (SortedContours, ObjectSelected, 2)
    
15. fit_circle_contour_xld (ObjectSelected, 'algebraic', -1, 0, 0, 3, 2, Row1, Column1, Radius1, StartPhi, EndPhi, PointOrder)
    
16. gen_circle_contour_xld (ContCircle, Row1, Column1, Radius1, StartPhi, EndPhi ,'positive', 1)
    
17. polar_trans_image_ext (Image20240123135334, ImagePolar, Row1, Column1, StartPhi, EndPhi, Radius1+20, Radius1+ 100, round(6.28*Radius1/4), 80, 'bilinear')
    
18. rotate_image (ImagePolar, ImageRotate, 180, 'constant')
    
19. threshold (ImageRotate, Region2, 0, 140)
    
20. connection (Region2, ConnectedRegions2)
    
21. select_shape (ConnectedRegions2, SelectedRegions2, 'area', 'and', 500, 750)
    
22. sort_region (SelectedRegions2, SortedRegions1, 'first_point', 'true', 'row')
    
23. read_ocr_class_mlp ('Industrial_0-9A-Z_NoRej', OCRHandle)
    
24. do_ocr_multi_class_mlp (SortedRegions1, ImageRotate, OCRHandle, Class, Confidence)
    
25. 
    
26. get_image_size (ImagePolar, Width1, Height1)
    
27. hom_mat2d_identity (HomMat2DIdentity)
    
28. hom_mat2d_rotate (HomMat2DIdentity, rad(180), Height1/2.0, Width1/2.0, HomMat2DRotate)
    
29. affine_trans_region (SortedRegions1, RegionAffineTrans, HomMat2DRotate, 'nearest_neighbor')
    
30. 
    
31. polar_trans_region_inv (RegionAffineTrans, XYTransRegion, Row1, Column1, StartPhi, EndPhi, Radius1+20, Radius1+ 100, round(6.28*Radius1/4), 80, Width, Height, 'nearest_neighbor')
    
32. area_center (XYTransRegion, Area, Row, Column)
    
33. dev_disp_text (Class, 'image', Row, Column, 'red', [], [])

复制代码

这个项目还没整完吗

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我用的极坐标转换

极坐标转换

学习，也有相关范例

halcon2016 发表于 2024-1-23 14:33

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学习学习

学习学习

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