python resize

  

   

    

     

    
    

     
   if img.shape[1] > 700:
     
    
   

    

     

    
    

     

       x_scale = 640 / img.shape[1]
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

       img = cv2.resize(img, None, fx=x_scale, fy=x_scale, interpolation=cv2.INTER_AREA)
     
    
  
 

  

   

    

     

    
    

     

      import time
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      import numpy as np
     
    
   

    

     

    
    

     

      import cv2
     
    
   

    

     

    
    

     

      if __name__ == '__main__':
     
    
   

    

     

    
    

     

       path=r'D:\data\Original\JPEGImages\09981.jpg'
     
    
   

    

     

    
    

     

       img1=cv2.imread(path)
     
    
   

    

     

    
    

     

       w=1280//2
     
    
   

    

     

    
    

     

       h=720//2
     
    
   

    

     

    
    

     

       start=time.time()
     
    
   

    

     

    
    

     

       img2 = np.resize(img1, (h, w,3))#变形
     
    
   

    

     

    
    

     

       print('time1',time.time()-start)#time1 0.0010004043579101562
     
    
   

    

     

    
    

     

       cv2.imshow('aa',img2)
     
    
   

    

     

    
    

     

       start = time.time()
     
    
   

    

     

    
    

     

       img3= cv2.resize(img1, (w, h))
     
    
   

    

     

    
    

     

       print('time2', time.time() - start)#time2 0.0009999275207519531
     
    
   

    

     

    
    

     

       cv2.imshow('bb', img1)
     
    
   

    

     

    
    

     

       cv2.imshow('cc', img3)
     
    
   

    

     

    
    

     

       cv2.waitKeyEx()
     
    
  
 

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原文链接：blog.csdn.net/jacke121/article/details/84317985