图像YCbCr与RGB空间相互转换

Halcom

图像YCbCr与RGB空间相互转换:

1. dev_update_off()
   
2. dev_set_draw('margin')
   
3. 
   
4. Path := 'C:/WITIAIIDE/ProgramsSamples/testimages'
   
5. ImageFormat := 'jpg'
   
6. list_image_files(Path, ImageFormat, [], ImageFiles)
   
7. ImagePath2 := ImageFiles[2]
   
8. read_image(Image1, ImagePath2)
   
9. 
   
10. count_channels(Image1, Channels1)
    
11. dev_disp_text(Channels1, 'window', 30, 'left', 'black', [], [])
    
12. 
    
13. decompose3(Image1, R, G, B)
    
14. convert_image_type(R, R1, 'real')
    
15. convert_image_type(G, G1, 'real')
    
16. convert_image_type(B, B1, 'real')
    
17. gen_empty_obj(R2)
    
18. scale_image(R1, R2, 65.481, 0)
    
19. scale_image(G1, G2, 128.553, 0)
    
20. scale_image(B1, B2, 24.966, 0)
    
21. add_image(R2, G2, Y, 1.0, 0)
    
22. add_image(Y, B2, Y, 1.0, 16)
    
23. 
    
24. scale_image(R1, R21, -37.797, 0)
    
25. scale_image(G1, G21, -74.203, 0)
    
26. scale_image(B1, B21, 112, 0)
    
27. add_image(R21, G21, Cb, 1.0, 0)
    
28. add_image(Cb, B21, Cb, 1.0, 128)
    
29. 
    
30. scale_image(R1, R22, 112, 0)
    
31. scale_image(G1, G22, -93.786, 0)
    
32. scale_image(B1, B22, -18.214, 0)
    
33. add_image(R22, G22, Cr, 1.0, 0)
    
34. add_image(Cr, B22, Cr, 1.0, 128)
    
35. 
    
36. compose3(Y, Cb, Cr, MultiChannelImage)
    
37. dev_display(MultiChannelImage)
    
38. 
    
39. 
    
40. * 从YCbCr转换到RGB
    
41. scale_image(Y, Y1, 0.0046, 0)
    
42. scale_image(Cb, Cb1, 0, 0)
    
43. scale_image(Cr, Cr1, 0.0063, 0)
    
44. add_image(Y1, Cr1, ImageRed, 1.0, 0)
    
45. add_image(ImageRed, Cb1, ImageRed, 1.0, 0.8742)
    
46. 
    
47. scale_image(Y, Y2, 0.0046, 0)
    
48. scale_image(Cb, Cb2, -0.0015, 0)
    
49. scale_image(Cr, Cr2, -0.0032, 0)
    
50. add_image(Y2, Cr2, ImageGreen, 1.0, 0)
    
51. add_image(ImageGreen, Cb2, ImageGreen, 1.0, -0.5317)
    
52. 
    
53. scale_image(Y, Y3, 0.0046, 0)
    
54. scale_image(Cb, Cb3, 0.0079, 0)
    
55. scale_image(Cr, Cr3, 0, 0)
    
56. add_image(Y3, Cr3, ImageBlue, 1.0, 0)
    
57. add_image(ImageBlue, Cb3, ImageBlue, 1.0, 1.0856)
    
58. 
    
59. compose3(ImageRed, ImageGreen, ImageBlue, MultiChannelImage1)
    
60. dev_display(MultiChannelImage1)

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参考：【1】图像颜色空间工具箱