Determine which version of OpenCV

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一个人的身影
一个人的身影 2021-01-17 08:16

I want to write to short code snippet in python, to determine which version of OpenCV has been installed in my System. How do i do it ? Thank you.

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  • 2021-01-17 08:32

    In terminal write:

    • for python 2.X python2 -c 'import cv2; print cv2.__version__'
    • for python 3.X python3 -c 'import cv2; print(cv2.__version__)'
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  • 2021-01-17 08:37

    Convenient functions to check OpenCV version in run-time

    def cv2():
        return opencv_version("2")
    
    def cv3():
        return opencv_version("3")
    
    def cv4():
        return opencv_version("4")
    
    def opencv_version(version):
        import cv2
        return cv2.__version__.startswith(version)
    

    Useful when performing cv2.findContours() since return signature varies by version

    # Using OpenCV 2.X or OpenCV 4
    if cv2() or cv4():
        cnts, _ = cv2.findContours(image, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
    
    # Using OpenCV 3
    elif cv3():
        _, cnts, _ = cv2.findContours(image, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
    
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  • 2021-01-17 08:43
    >>> from cv2 import __version__
    >>> __version__
    '$Rev: 4557 $'
    

    If that doesn't work then, use cv instead of cv2.

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  • 2021-01-17 08:57

    One line way can be like below:-

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