OpenCV
From charlesreid1
The OpenCV library is a general, all-purpose computer vision library. It's high performance and written in C++. It has many dependencies and is non-trivial to install, so the best approach is to either use a detailed guide, a package manager like aptitude or homebrew, or an Ansible playbook.
Operating Systems
Mac
To install OpenCV on a Mac, use Homebrew.
Raspberry Pi
OpenCV/Cross Compiling on Mac for Raspberry Pi