sudo apt-get install build-essential ffmpeg libavcodec-dev libavformat-dev libswscale-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev cmake subversion libgtk2.0-dev pkg-config python git libv4l-dev liblo-dev
wget http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.4.2/OpenCV-2.4.2.tar.bz2/download
http://docs.opencv.org/doc/tutorials/introduction/linux_install/linux_install.html#linux-installation