python opencv 凸包

  

   

    

     

    
    

     

      # -*- coding: UTF-8 -*-
     
    
   

    

     

    
    

     

      import datetime
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      import cv2
     
    
   

    

     

    
    

     

      import numpy as np
     
    
   

    

     

    
    

     

      import os
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      def get_convexHull(src2):
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

       h,w=src2.shape[:2]
     
    
   

    

     

    
    

     

       gray = cv2.cvtColor(src2, cv2.COLOR_BGR2GRAY)
     
    
   

    

     

    
    

     
 # 二值化
     
    
   

    

     

    
    

     

       ret, binary = cv2.threshold(gray, 125, 255, cv2.THRESH_BINARY | cv2.THRESH_OTSU)
     
    
   

    

     

    
    

     
 # 获取结构元素
     
    
   

    

     

    
    

     

       k = cv2.getStructuringElement(cv2.MORPH_RECT, (3, 3))
     
    
   

    

     

    
    

     
 # 开操作
     
    
   

    

     

    
    

     

       binary = cv2.morphologyEx(binary, cv2.MORPH_OPEN, k)
     
    
   

    

     

    
    

     

       cv2.imshow("binary", binary)
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 # 轮廓发现
     
    
   

    

     

    
    

     

       contours, hierarchy = cv2.findContours(binary, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 for c in range(len(contours)):
     
    
   

    

     

    
    

     
 # 是否为凸包
     
    
   

    

     

    
    

     

       ret = cv2.isContourConvex(contours[c])
     
    
   

    

     

    
    

     
 if not ret:
     
    
   

    

     

    
    

     
 # 凸包检测
     
    
   

    

     

    
    

     

       points = cv2.convexHull(contours[c])
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

       hull_area = cv2.contourArea(points)
     
    
   

    

     

    
    

     
 if hull_area<100*100:
     
    
   

    

     

    
    

     
 continue
     
    
   

    

     

    
    

     
 if hull_area>(0.3*w*h):
     
    
   

    

     

    
    

     

       co
     
    
  
 

文章来源: blog.csdn.net，作者：网奇，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/jacke121/article/details/109683201