OpenCV 2.4 for linux

Installation for OpenCV 2.4

THIS TUTORIAL WORKS FOR UBUNTU 12.04
 
tar xvf OpenCV-2.4.2.tar.bz2

cd OpenCV-2.4.2/
mkdir build
cd build

To install OpenCV 2.4.2 or 2.4.3 on the Ubuntu 12.04 operating system, first install a developer environment to build OpenCV.
sudo apt-get -y install build-essential cmake pkg-config

Install Image I/O libraries
sudo apt-get -y install libjpeg62-dev
sudo apt-get -y install libtiff4-dev libjasper-dev

Install the GTK dev library
sudo apt-get -y install  libgtk2.0-dev libgtkglext1 libgtkglext1-dev


Install Video I/O libraries
sudo apt-get -y install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev libavcodec-dev libavformat-dev libswscale-dev

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON -D WITH_V4L=ON -D WITH_OPENGL=ON ..

make
sudo make install

restart

configure Eclipse:
Create an C++ project
right click the project>>properties>>C/C++ Build>>Settings>>GCC C++ Compiler>>include
/usr/local/opencv

in terminal, to make sure:
pkg-config --cflags opencv

GCC C++ Linker>>Libraries to include
/usr/local/opencv                      === in library search path

in terminal, pkg-config --lib opencv == to see how many libraries

include:                       === in libraries
opencv_core 
opencv_imgproc 
opencv_highgui 
opencv_ml 
opencv_video 
opencv_features2d 
opencv_calib3d 
opencv_objdetect 
opencv_contrib 
opencv_legacy 
opencv_flann

Write your opencv program, compile!



Configure Linux.
Tell linux where the shared libraries for OpenCV are located by entering the following shell command:
            	
            export LD_LIBRARY_PATH=/usr/local/lib

add the command to your .bashrc file so that you don’t have to enter every time your start a new terminal.

Alternatively, you can configure the system wide library search path. Using your favorite editor, add a single line containing the text /usr/local/lib to the end of a file named /etc/ld.so.conf.d/opencv.conf. In the standard Ubuntu install, the opencv.conf file does not exist; you need to create it. Using vi, for example, enter the following commands:
            	
            sudo vi /etc/ld.so.conf.d/opencv.conf
            G
            o
            /usr/local/lib
            <Esc>
            :wq!

After editing the opencv.conf file, enter the following command:
            	
            sudo ldconfig /etc/ld.so.conf

Using your favorite editor, add the following two lines to the end of /etc/bash.bashrc:
            	
            PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
            export PKG_CONFIG_PATH

After completing the previous steps, your system should be ready to compile code that uses the OpenCV libraries.

 

The following example shows one way to compile code for OpenCV:

    g++ `pkg-config opencv --cflags` my_example.cpp -o my_example `pkg-config opencv --libs`