python的opencv出错了，该怎么改？

Question

E:\practise\venv\Scripts\python.exe E:/practise/demo5.py
Traceback (most recent call last):
  File "E:/practise/demo5.py", line 5, in <module>
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
cv2.error: OpenCV(4.5.1) C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-oduouqig\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'
 

Answer 1

这个报错一般是你图片是空的就这样，也就是说你cv2.imread读取的路径有问题，导致读取图像失败。检查下路径或者图像后缀名