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Install OpenCV

Install OpenCV

Step 1: Make Directory

mkdir opencv cd /opencv/

Step 2: Remove any pre-installed ffmpeg and x264

sudo apt-get -qq remove ffmpeg x264 libx264-dev

Step 3:  Install Dependenices

As reported by kumaranbus, installing ‘libopencv-dev‘ on non nvidia graphics card messes up the drivers. As a workaround for non nvidia cards like AMD/ATI, Radeon, replace libopencv-dev below with ‘ocl-icd-libopencl1‘ which is a generic driver. Please note that I have not tried this out yet as I have no ATI/Radeon cards to test with
sudo apt-get -qq install libopencv-dev 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

- Install ffmpeg

sudo add-apt-repository ppa:mc3man/trusty-media sudo apt-get update sudo apt-get install ffmpeg gstreamer0.10-ffmpeg

Step 4: Download and extract OpenCV

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 5: Begin Build Process

Note that this bit would take some time to complete

mkdir build cd build 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 .. make -j4 sudo make install sudo sh -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf' sudo ldconfig

opencv-2.4.9-01

- Reboot your machine

Step 6: Example using OpenCV

- Change directory to following location

cd /usr/local/share/OpenCV/samples/c

- Execute following commands

sudo chmod +x build_all.sh

sudo ./build_all.sh

./facedetect "/usr/share/opencv/haarcascades/\
haarcascade_frontalface_alt.xml"
lena.jpg

or

./facedetect --cascade="/usr/share/opencv/haarcascades/\
haarcascade_frontalface_alt
.xml" lena.jpg

opencv-2.4.9-02

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