opencv  4.0.0
About: OpenCV (Open Source Computer Vision) is a library of programming functions for real time computer vision (for e.g. for human-computer interaction (HCI), object identification, face and gesture recognition, motion tracking, ...).
  Fossies Dox: opencv-4.0.0.tar.gz  ("inofficial" and yet experimental doxygen-generated source code documentation)  

opencv Documentation