Installing OpenCV 2.4.9 in Ubuntu 14.04

In the previous post information on Ubuntu installation was shared, in this post we shall see how to install OpenCV in Ubuntu 14.04.

Note : The Instructions are from the site below. The same has been posted here for reference -
http://www.sysads.co.uk/2014/05/install-opencv-2-4-9-ubuntu-14-04-13-10/

Step 1 The first step here is the most important step. And the first step is to update the list of package repositories. This will come in handy while installing latest packages and their dependencies described in upcoming steps.

sudo apt-get update

This will take a while. I would suggest a cup of coffee.

Step 2 Remove previously installed FFMPEG and x264 libraries

sudo apt-get remove ffmpeg x264 libx264-dev

Step 3 Once this is completed, install the necessary packages for compiling openCV sources
Note: The package “ocl-icd-libopencl1” is selected for the following installation as my system does not contain NVIDIA graphics card. If your system has NVIDIA card then install ‘libopencv-dev’ instead of
‘ocl-icd-libopencl1’.

sudo apt-get install ocl-icd-libopencl1 build-essential checkinstall cmake pkg-config 
yasm libjpeg-dev libjasper-dev libavcodec-dev libavformat-dev libswscale-dev 
libdc1394-22-dev libxine-dev libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev 
libv4l-dev python-dev python-numpy libtbb-dev libqt4-dev libgtk2.0-dev libfaac-dev 
libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev libtheora-dev libvorbis-dev 
libxvidcore-dev x264 v4l-utils 

Notice most of the packages are already installed during Ubuntu Installation. If not it will be installed now anyway.

Note: In this sample, the system contains AMD [ATI Radeon] graphics card


Step 4 Make a directory to download and build OpenCV

mkdir opencv
cd /opencv/

Step 5 Download the OpenCV sources for linux or Click here to start download. Unzip the OpenCV Sources.

wget -O OpenCV-2.4.9.zip http://fossies.org/linux/misc/opencv-2.4.9.zip
unzip OpenCV-2.4.9.zip
cd opencv-2.4.9

Step 6 Create a directory for compiling the sources

mkdir build
cd build

Step 7 Start building sources using CMAKE and install.

Important !! Make sure that the hierarchical path to the OpenCV sources does not contain any spaces.
Ex:

/home/bhp/my stuff/opencv src compilation/opencv2.4.9 <<--incorrect

/home/bhp/my_stuff/opencv/opencv2.4.9/                <<--better

Now compile the sources with all support and install

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON 
-D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON 
-D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON ..

The next step will take a while. Use multiple jobs to 'make' faster. [Ex: make -j8]

make
sudo make install

sudo sh -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'
sudo ldconfig

Step 8 Reboot the system for everything to take effect.

Step 9 Run an example C++ code provided with OpenCV Sources

cd /usr/local/share/OpenCV/samples/cpp
g++ houghlines.cpp -o application `pkg-config --cflags --libs opencv`
./application

Result