錯誤而使用numpy的

Question

裁剪圖像我是試試這個代碼

import cv2 
img = cv2.imread("image.jpg") 
crop_img = img[100:200, 200:400] # Crop from x, y, w, h -> 100, 200, 100, 200 
cv2.imshow("cropped", crop_img) 
cv2.waitKey(0) 

它幾times..but工作突然就出來這個錯誤：

Traceback (most recent call last): 
File "test5.py", line 7, in <module> 
crop_img = img[100:200, 200:400] # Crop from x, y, w, h -> 100, 200, 100, 200`` 
TypeError: 'NoneType' object has no attribute '__getitem__' 

任何人都可以幫助我..

Answer 1

如果cv2.imread找不到文件名i t returns None。 如果img是無，那麼img[100:200, 200:400]將提高

TypeError: 'NoneType' object has no attribute '__getitem__'