How to update OpenCV 3.4.2 to OpenCV 4 or latest stable version?

Question

I have installed OpenCV 3.4.2 successfully by following the tutorial given here:

https://www.pyimagesearch.com/2015/07/20/install-opencv-3-0-and-python-3-4-on-ubuntu/

Now, I would like to update to openCV 4 or the latest stable version.

Do I need to uninstall 3.4.2 first? If so, how should I uninstall it.

I am afraid to creating another virtual environment and installing version 4 or master package from github by following the same steps might create conflicts. Please advice.

Working on Ubuntu 16.04 LTS, python 3.5

Answer 1

For Python interface, I guess you can try something like pip install opencv-python==4.0.0.21 . Note, you might need to run pip3 install opencv-python==4.0.0.21 depending upon your pip version.