Perhaps the single most important library that you have to be familiar with if you want to make any headway into this field is OpenCV. Admittedly, there are a lot of other libraries out there, but none with the level of documentation and structure that the makers of OpenCV have provided. In this page you will learn a few tricks for using the libraries. Please note that I will post only problems that are very specific. For starters, please look into this group or read this book which addresses most of the issues associated with OpenCV. For you advanced users, I hope these tips are helpful.