The difference between opencv-python and opencv-contrib-python

As per PyPi documentation:

There are four different packages (see options 1, 2, 3 and 4 below):

Packages for standard desktop environments:

Option 1 – Main modules package: pip install opencv-python

Option 2 –
Full package (contains both main modules and contrib/extra modules):
pip install opencv-contrib-python (check contrib/extra modules listing
from OpenCV documentation)

Packages for server (headless) environments:

Option 3 – Headless main modules package: pip install opencv-python-headless

Option 4 – Headless full package (contains both main modules and contrib/extra modules): pip install opencv-contrib-python-headless

Do not install multiple different packages in the same environment