Question

from os import listdir
import cv2


files=listdir('/home/raymond/Desktop/Test/Test') #Importing the dir for cropping
for file in files:
    img = cv2.imread('/home/raymond/Desktop/Test/Test'+file) # reading a single image from the dir
    crop_img = img[0:1600, 0:1600]
    cv2.imwrite('/home/raymond/Desktop/Test/cropped'+file,crop_img) # write new data to img

我正在尝试循环裁剪图像，但出现错误

Traceback (most recent call last):
  File "Files.py", line 8, in <module>
    crop_img = img[0:1600, 0:1600]
TypeError: 'NoneType' object is not subscriptable
(fixi) ➜  exercises

Answer 1

您可能在此处的路径末尾缺少斜线：

img = cv2.imread('/home/raymond/Desktop/Test/Test'+file) # reading a single image from the dir

应该是：

img = cv2.imread('/home/raymond/Desktop/Test/Test/'+file) # reading a single image from the dir

甚至更好：

import os 
img = cv2.imread(os.path.join('/home/raymond/Desktop/Test/Test/',file)) # reading a single image from the dir

Answer 2

img = cv2.imread（'/ home / raymond / Desktop / Test / Test'+ file）

你好Dan Raymond，

这不起作用，因为 Python 不会在列出的文件名之前添加斜杠（/）。
这意味着，如果文件名是“ hello”，则附加到“ / home / raymond / Desktop / Test / Test”的文件是“ hello”，这将导致'/ home / raymond / Desktop / Test / Testhello 不存在。

用以下内容替换行：

img = cv2.imread('/home/raymond/Desktop/Test/Test/'+file)

TypeError：NoneType，尝试循环裁剪图像时

2 个答案: