python Opencv报错

Question

import cv2
cam = cv2.VideoCapture(0, cv2.CAP_DSHOW)
ret_val, img = cam.read()
img = cv2.flip(img, 1)
cv2.imshow('my webcam', img)

 报错如下

Traceback (most recent call last):
  File "C:/Users/arite/Desktop/test.py", line 5, in <module>
    cv2.imshow('my webcam', img)
cv2.error: OpenCV(4.0.1) C:\ci\opencv-suite_1573470242804\work\modules\highgui\src\window.cpp:352: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow'

Answer 1

这种报错一般是版本不兼容的原因，安装其他版本试试。