Halcon案例之BLOB分析

青旅半醒 2023-01-13 06:11 143阅读 0赞

![æµè°æºå¨è§è§ä¹BLOBå¾åå¤çææ¯][BLOB]

Blob分析主要内容包括但不限于以下几点：

（1）图像分割：将图像中的目标和背景分离。

（2）去噪：消除或减弱噪声对目标的干扰。

（3）场景描述：对目标之间的拓扑关系进行描述。

（4）特征量计算：计算目标的2-D形状特征。

# **Blob分析的主要过程（常用套路）：** #

### **获取图像->分割图像（区分前景像素和背景像素）->特征提取（比如面积、重心、旋转角度等）** ###

**参考：**[https://blog.csdn.net/Gavinmiaoc/article/details/79407685][https_blog.csdn.net_Gavinmiaoc_article_details_79407685]

* ball.hdev: Inspection of Ball Bonding
    * 这个例子演示了如何找出 电路板上 那一排焊接点
    dev_update_window ('off')
    *把更新环境窗口关了
    dev_close_window ()
    dev_open_window (0, 0, 728, 512, 'black', WindowID)
    read_image (Bond, 'die/die_03')
    dev_display (Bond)
    set_display_font (WindowID, 14, 'mono', 'true', 'false')
    disp_continue_message (WindowID, 'black', 'true')
    stop ()
    threshold (Bond, Bright, 100, 255)
    shape_trans (Bright, Die, 'rectangle2')
    *形状选择，把某个区域转正外接矩形 区域
    dev_set_color ('green')
    dev_set_line_width (3)
    dev_set_draw ('margin')
    dev_display (Die)
    *上面四步骤就是显示一下区域的边缘
    disp_continue_message (WindowID, 'black', 'true')
    stop ()
    reduce_domain (Bond, Die, DieGrey)
    *裁剪某个区域的图像
    threshold (DieGrey, Wires, 0, 50)
    fill_up_shape (Wires, WiresFilled, 'area', 1, 100)
    *填充区域内的空洞
    dev_display (Bond)
    dev_set_draw ('fill')
    dev_set_color ('red')
    dev_display (WiresFilled)
    disp_continue_message (WindowID, 'black', 'true')
    stop ()
    opening_circle (WiresFilled, Balls, 15.5)
    *以半径为15.5的圆去做开运算，放得下这个圆的地方保留，放不下的去掉
    dev_set_color ('green')
    dev_display (Balls)
    disp_continue_message (WindowID, 'black', 'true')
    stop ()
    connection (Balls, SingleBalls)
    select_shape (SingleBalls, IntermediateBalls, 'circularity', 'and', 0.85, 1.0)
    *以圆度筛选出上面那几个圆，筛选掉下面那个 开运算留下的噪声特征
    sort_region (IntermediateBalls, FinalBalls, 'first_point', 'true', 'column')
    *按照列排序
    dev_display (Bond)
    dev_set_colored (12)
    dev_display (FinalBalls)
    disp_continue_message (WindowID, 'black', 'true')
    stop ()
    smallest_circle (FinalBalls, Row, Column, Radius)
    *算出七个区域的最小外接圆，圆心坐标 和半径
    NumBalls := |Radius|
    Diameter := 2 * Radius
    meanDiameter := mean(Diameter)
    minDiameter := min(Diameter)
    dev_display (Bond)
    disp_circle (WindowID, Row, Column, Radius)
    dev_set_color ('white')
    for i := 1 to NumBalls by 1
        if (fmod(i,2)==1)
          disp_message (WindowID, 'D: ' + Diameter[i-1]$'.4', 'image', Row[i-1] - 2 * Radius, Column, 'white', 'false')
        else
          disp_message (WindowID, 'D: ' + Diameter[i-1]$'.4', 'image', Row[i-1] - 42 * Radius, Column+32, 'red', 'false')
       
        endif
    endfor
    
    dev_update_window ('on')

[BLOB]: /images/20221022/eee9a4821fad4bf190fa47ddb0d250bd.png
[https_blog.csdn.net_Gavinmiaoc_article_details_79407685]: https://blog.csdn.net/Gavinmiaoc/article/details/79407685