'cv2' has no attribute '_registerMatType 问题解决

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1.报错信息

/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/cv2/mat_wrapper/__init__.py in <module> 31 Mat.__module__ = cv.__name__ 32 cv.Mat = Mat ---> 33 cv._registerMatType(Mat) AttributeError: module 'cv2' has no attribute '_registerMatType'

今天使用opencv碰到的，感觉有点怪怪的，后来就github搜索，其实这个问题在2021年就已经有人说了。

2.信息确认

出错了当然第一时间github查了，会特别准确，不建议百度。

github.com/opencv/open…

3.降级解决

There is mess with versions:

-   `_registerMatType` is a part of OpenCV 4.5.4
-   but you mention 4.5.1

Please ensure that you have installed one version of OpenCV only.

4.headless解决

I solved this error on Google Colab by downloading the headless open-cv and of a version below 4.3 because [backward compatibility](https://github.com/opencv/opencv-python#backward-compatibility) was dropped since 4.3.0. Try the following command in Google Colab:

`!pip install "opencv-python-headless<4.3"`

Here's a thread from [stack overflow](https://stackoverflow.com/questions/64650877/install-of-opencv-python-headless-takes-a-long-time) on the same issue.

看来大家在codelab上也遇到了。

opencv-python-headless<4.3

5.全部升级法

My problem was related to diferent versions of opencv modules. You can check it with:\
`pip list | grep opencv`

upgrading all modules to the same version solved my error:


pip install --upgrade opencv-python
pip install --upgrade opencv-contrib-python
pip install --upgrade opencv-python-headless

6.总结

建议那就都用最新版本吧，免得这错那错。