python - Python openCV:无法显示图像

Question

我正在使用python opencv，并且尝试导入图像并显示它，但是出现以下错误:

import numpy as np
import cv2
img = cv2.imread('messi5.jpg',0)
cv2.imshow('image',img)
OpenCV Error: Assertion failed (size.width>0 && size.height>0) in cv::imshow, fi
le C:\builds\master_PackSlaveAddon-win64-vc12-static\opencv\modules\highgui\src\
window.cpp, line 271
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
cv2.error: C:\builds\master_PackSlaveAddon-win64-vc12-static\opencv\modules\high
gui\src\window.cpp:271: error: (-215) size.width>0 && size.height>0 in function

Answer 1

In [1]: a = None
In [2]: type(a)
Out[2]: NoneType
In [3]: import cv2
In [4]: img = cv2.imread('messi.jpg',0)
In [5]: type(img)
Out[5]: numpy.ndarray
In [6]: img = cv2.imread('messii.jpg',0)
In [7]: type(img)
Out[7]: NoneType

在这里，您的 img类型为NoneType。因此，这是拼写错误或图像不存在的问题。请检查文件的拼写或是否存在。