Halcon-图像阈值分割

快来打我* 2022-10-24 01:29 265阅读 0赞

**全局阈值**

*阈值分割-全局阈值
    read_image (Image1, 'keypad')
    rgb1_to_gray (Image1, Image)
    dev_close_window ()
    get_image_size (Image, Width, Height)
    dev_open_window (0, 0, Width, Height, 'black', WindowHandle)
    threshold (Image, Region, 20, 90)
    dev_display (Image)
    dev_display (Region)

![在这里插入图片描述][2021012817482567.jpg_pic_center]  
**直方图阈值**

*直方图谷底阈值分割
    read_image (Image1, 'keypad')
    rgb1_to_gray (Image1, Image)
    dev_close_window ()
    get_image_size (Image, Width, Height)
    dev_open_window (0, 0, Width, Height, 'black', WindowHandle)
    
    gray_histo (Image, Image, AbsoluteHisto, RelativeHisto)
    histo_to_thresh (AbsoluteHisto, 8, MinThresh, MaxThresh)
    dev_set_color ('white')
    threshold (Image, Region, MinThresh[0], MaxThresh[0])
    dev_display (Region)

**最大类间方差法-OTSU**

*OTSU
    dev_close_window ()
    read_image (Image, 'for6')
    dev_set_draw ('margin')
    get_image_pointer1 (Image, Pointer, Type, Width, Height)
    dev_open_window (0, 0, Width, Height, 'black', WindowHandle)
    dev_display (Image)
    
    MaxVariance:=0.0
    for T:=1 to 255 by 1
        dev_display (Image)
        threshold (Image, Region, T, 255)
        area_center (Region, Area, Row, Column)
        intensity (Region, Image, Mean, Deviation)
        complement (Region, RegionComplement)
        area_center (RegionComplement, Area1, Row1, Column1)
        intensity (RegionComplement, Image, Mean1, Deviation1)
        Otsu:=Area*1.0/[Width*Height]*Area1*1.0/[Width*Height]*pow(Mean-Mean1,2)
        if (Otsu>MaxVariance)
            MaxVariance:=Otsu
            Best_T:=T
        endif
    endfor
    dev_display (Image)
    dev_set_color ('white')
    dev_set_draw ('fill')
    
    threshold (Image, Region1, Best_T, 255)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTY0NTI4MQ_size_16_color_FFFFFF_t_70_pic_center]

[2021012817482567.jpg_pic_center]: /images/20221024/da97bfea20d04962b0022f4a5725877c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTY0NTI4MQ_size_16_color_FFFFFF_t_70_pic_center]: /images/20221024/8d097042ba764710b9fbfde83bdbfe6b.png