title: Not enough memory on raspberry pi to install opencv , Is there a special way to install raspbian OS on SD card to save lot free memory
body: <p>I have a raspberry pi B+. I installed raspbian OS on 16GB SD card and put it in to raspberry pi(work properly). Now I want to install opencv on it. But it shows only small available memory.(cannot install opencv on it, because of not enough free space).
  how can I get more memory. Is there a special way to write raspbian image  in SD card(like partition the SD card and install raspbian). looking for your help. thanx.....</p>