Rebuild the library with Windows

python的报错如下：

Traceback (most recent call last):

  File "main.py", line 26, in <module>

    cv2.imshow('chip_'+str(i), chip)

cv2.error: OpenCV(4.1.2) C:\projects\opencv-python\opencv\modules\highgui\src\window.cpp:651: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Cocoa support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvShowImage'

解决方法：

pip install opencv-contrib-python