title: The difference between opencv-python and opencv-contrib-python
body: <p>I was looking at the Python Package Index (PyPi) and noticed 2 very similar packages: <a href="https://pypi.org/project/opencv-contrib-python/" rel="noreferrer">opencv-contrib-python</a> and <a href="https://pypi.org/project/opencv-python/" rel="noreferrer">opencv-python</a> and wondering what the difference was. I looked at them and they had the exact same description and version numbers.</p>