cannot import name ‘_registerMatType’ from ‘cv2.cv2’

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The same thing occurred to me yesterday when I used Colab. A possible reason may be that the version of opencv-python(4.1.2.30) does not match opencv-python-headless(4.5.5.62). Or the latest version 4.5.5 may have something wrong…

I uninstalled opencv-python-headless==4.5.5.62 and installed 4.1.2.30 and it fixed.

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