https://www.samontab.com/web/2017/06/installing-opencv-3-2-0-with-contrib-modules-in-ubuntu-16-04-lts/

Installing OpenCV 3.2.0 with contrib modules in Ubuntu 16.04 LTS

OpenCV 3.2.0 has been out for a while and contains many improvements and exciting new features, so it’s time to update this guide using the latest Ubuntu 16.04LTS

.

A big change in OpenCV 3.2.0 is that now many of the newest algorithms now reside separately in the contrib repository.

Some of these modules include Face Recognition, RGB-Depth processing, Image Registration, Saliency, Structure From Motion, Tracking, and much more.

So let’s install OpenCV 3.2.0

with the contrib modules and other good stuff by executing the following code on the command line:

01	sudo apt-get update

02	sudo apt-get upgrade

03

sudo apt-get install build-essential libgtk2.0-dev libjpeg-dev libtiff5-dev libjasper-dev libopenexr-dev cmake python-dev python-numpy python-tk libtbb-dev libeigen3-dev yasm libfaac-dev libopencore-amrnb-dev libopencore-amrwb-dev libtheora-dev libvorbis-dev libxvidcore-dev libx264-dev libqt4-dev libqt4-opengl-dev sphinx-common texlive-latex-extra libv4l-dev libdc1394-22-dev libavcodec-dev libavformat-dev libswscale-dev default-jdk ant libvtk5-qt4-dev

04

cd ~

05	mkdir opencv

06

cd opencv

07	wget https://github.com/opencv/opencv/archive/3.2.0.tar.gz

08	tar -xvzf 3.2.0.tar.gz

09	wget https://github.com/opencv/opencv_contrib/archive/3.2.0.zip

10	unzip 3.2.0.zip

11	cd opencv-3.2.0

But before we build it, we need to fix one problem currently present in the contrib modules, specifically in the freetype module, which allows you to draw UTF-8 strings. If you are getting an error similar to ImportError: /usr/local/lib/libopencv_freetype.so.3.2: undefined symbol: hb_shape, this will fix it:

1	sed -i 's/${freetype2_LIBRARIES} ${harfbuzz_LIBRARIES}/${FREETYPE_LIBRARIES} ${HARFBUZZ_LIBRARIES}/g' ../opencv_contrib-3.2.0/modules/freetype/CMakeLists.txt

Since now that problem is solved, now we are ready to build OpenCV.

01	mkdir build

02

cd build

03	cmake -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 -D WITH_VTK=ON .. -DCMAKE_BUILD_TYPE=RELEASE -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-3.2.0/modules ..

04

make

05	sudo make install

06	echo '/usr/local/lib' | sudo tee --append /etc/ld.so.conf.d/opencv.conf

07	sudo ldconfig

08	echo 'PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig' | sudo tee --append ~/.bashrc

09	echo 'export PKG_CONFIG_PATH' | sudo tee --append ~/.bashrc

10	source ~/.bashrc

Now you should be able to compile with the OpenCV libraries, including the contrib repositories.

For example, let’s compute some Fine-Grained Saliency, which is available in the saliency module of the contrib repository:

1

cd ~

2	mkdir saliency

3	cd saliency

4	cp ../opencv/opencv_contrib-3.2.0/modules/saliency/samples/computeSaliency.cpp .

5	cp ../opencv/opencv-3.2.0/samples/data/Megamind.avi .

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

7	./computeSaliency FINE_GRAINED Megamind.avi 23

Original Image:

Computed Saliency:

Posted in Image Processing, Open Source, Programming.

15 comments

By samontab – June 3, 2017