halcon显示直方图，直方图均衡化

*显示直方图
while (true)
    read_image(Image, 'D:\\1.PNG')
    rgb1_to_gray (Image, GrayImage)
    dev_display (GrayImage)
    wait_seconds (1)
    
    *1\显示原图直方图
    gray_histo (GrayImage, GrayImage,AbsoluteHisto, RelativeHisto)
    dev_open_window (0, 0, 512, 512, 'black', WindowHandle)
    dev_set_color ('green')
    gen_region_histo (Region, AbsoluteHisto, 255, 255, 1)
    dev_display (Region)
    
    *2\直方图均衡化后显示直方图
    equ_histo_image (GrayImage, ImageEquHisto)
    gray_histo (ImageEquHisto, ImageEquHisto,AbsoluteHisto, RelativeHisto)
    dev_open_window (0, 0, 512, 512, 'black', WindowHandle)
    dev_set_color ('red')
    gen_region_histo (Region, AbsoluteHisto, 255, 255, 1)
    dev_display (Region)
    break
endwhile