Learning OpenCV 4 Computer Vision with Python 3 - Third Edition

Using a ready-made OpenCV package

OpenCV, including the opencv_contrib modules, can be installed as a pip package. This is as simple as running the following command:

$ pip3 install opencv-contrib-python

If you want your OpenCV installation to include non-free content, such as patented algorithms, then you can run the following command instead:

$ pip install opencv-contrib-python-nonfree

If you intend to distribute software that depends on OpenCV's non-free content, you should do your own investigation of how the patent and licensing issues might apply in specific countries and to specific use cases. OpenCV's non-free content includes implementations of the patented SIFT and SURF algorithms, which we will introduce in Chapter 6, Retrieving ...