仿射变换：水平矫正

Halcom

仿射变换：水平矫正，本例用于分析wafer的倾斜角度，wafer晶圆是一类特殊结构的obj；

1. * 使用text_line_orientation算法矫正wafer角度
   
2. *
   
3. dev_update_off ()
   
4. dev_close_window ()
   
5. read_image (Image, 'wafer/wafer_rotated')
   
6. dev_open_window_fit_image (Image, 0, 0, -1, -1, WindowHandle)
   
7. set_display_font (WindowHandle, 10, 'mono', 'true', 'false')
   
8. dev_set_draw ('margin')
   
9. dev_display(Image)
   
10. *
    
11. * 初始化旋转中心
    
12. RotCenterRow := 360.13
    
13. RotCenterCol := 359.99
    
14. gen_cross_contour_xld (Cross, RotCenterCol, RotCenterCol, 20, 0.785398)
    
15. gen_rectangle1 (Rectangle, RotCenterRow - 55, RotCenterCol - 300, RotCenterRow + 55, RotCenterCol + 300)
    
16. *
    
17. * 使用text_line_orientation算法矫正wafer角度
    
18. reduce_domain (Image, Rectangle, ImageReduced)
    
19. text_line_orientation (Rectangle, ImageReduced, 25, rad(-30), rad(30), OrientationAngle)
    
20. Angle := -deg(OrientationAngle)
    
21. * correct the alignment
    
22. rotate_image (Image, ImageRotate, Angle, 'constant')
    
23. *
    
24. * Display the results
    
25. dev_clear_window ()
    
26. dev_display (ImageRotate)
    
27. dev_display (Cross)
    
28. disp_message (WindowHandle, 'The wafer must be rotated by ' + Angle .2f' + '° \nto be correctly aligned', 'window', 12, 12, 'black', 'true')

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参考：
【1】频域自相关变换
【2】仿射变换hom_mat2d_identity