I want to do image processing in raspberry pi (human detection from images) using open cv tools and python. can someone help me how to start with this(I am a novice) and what version of os is apt for this? thanks in advance.
Raspbian (see link below) is a Raspberry Pi specific port of Debian GNU/Linux, which has many thousands of packages available in its package repositories (including OpenCV and python). There are many other Linux distributions for this device - you might want to try a few and see what you like best :-)