python 批量resize性能比较

torch是最快的，能快1ms

分别是5ms 9ms  6ms，但是torch 占用cpu很高。

  

   

    

     

    
    

     

      import time
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      import cv2
     
    
   

    

     

    
    

     

      import torch
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      img = cv2.imread('d:/guo.jpg')  # modify the image path to yours
     
    
   

    

     

    
    

     

      img =cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      pic_w=1200
     
    
   

    

     

    
    

     

      start=time.time()
     
    
   

    

     

    
    

     

      tensor_in = torch.FloatTensor(img)
     
    
   

    

     

    
    

     

      for i in range(10):
     
    
   

    

     

    
    

     

       pic_w = int(pic_w * 0.8)
     
    
   

    

     

    
    

     

       tensor_in = tensor_in.resize_(pic_w,pic_w,3)
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      print('time0',time.time()-start)
     
    
   

    

     

    
    

     

      pic_w=1200
     
    
   

    

     

    
    

     

      start=time.time()
     
    
   

    

     

    
    

     

      for i in range(10):
     
    
   

    

     

    
    

     

       pic_w=int(pic_w*0.8)
     
    
   

    

     

    
    

     

       a=cv2.resize(img,(pic_w,pic_w))
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

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

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      pic_w = 1200
     
    
   

    

     

    
    

     

      start = time.time()
     
    
   

    

     

    
    

     

      for i in range(10):
     
    
   

    

     

    
    

     

       pic_w = int(pic_w * 0.8)
     
    
   

    

     

    
    

     

       img= cv2.resize(img, (pic_w, pic_w))
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

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

torch.Tensor特别占用时间，下面代码需要58ms

pic_w
 

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/88146821