Linux, C++ and other Tortures: Image processing with OpenCV

Hi again!! Following the format of my previous posts I will try to show step by step how to install and configure the OpenCV libraries, one of main open source references regarding image and video processing.

A. Installing the dependencies on Debian Squeeze

1. CMake

sudo apt-get install cmake

2. pkg-config

sudo apt-get install pkg-config

3. GTK

sudo apt-get install libgtk2.0-cil libgtk2.0-cil-dev
sudo apt-get install libgtk2.0-0 sudo apt-get install libgtk2.0-dev

4. Miscellaneous dependencies

sudo apt-get install swig
sudo apt-get install libjpeg62 libjpeg62-dev
sudo apt-get install libtiff4 libtiff4-dev

sudo apt-get install libjasper1 libjasper-dev

sudo apt-get install libpng12-0 libpng-dev

sudo apt-get install zlib1g zlib1g-dev

sudo apt-get install openexr

sudo apt-get install ffmpeg

sudo apt-get install libgstreamer0.10-0 libgstreamer0.10-dev

sudo apt-get install libv4l-0 libv4l-dev

sudo apt-get install libxine1 libxine-dev

sudo apt-get install libunicap2 libunicap2-dev

sudo apt-get install libdc1394-22 libdc1394-22-dev

sudo apt-get install libavcodec52 libavcodec-dev

sudo apt-get install libavutil49 libavutil-dev

sudo apt-get install libpostproc51 libpostproc-dev

sudo apt-get install libswscale0 libswscale-dev

sudo apt-get install libavfilter0 libavfilter-dev

B. Download the libcv libraries and untar it on a local directory. You can download it from here: http://opencv.willowgarage.com/wiki/

C. Compiling the libcv library and headers

cd /home/javier/Desktop/OpenCV-2.3.1/

mkdir release

cd release

cmake D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_EXAMPLES=ON ..

My results:

-- General configuration for opencv 2.3.1 =====================================

-- Built as dynamic libs?: YES

-- Compiler: /usr/bin/c++

-- C++ flags (Release): -Wall -pthread -march=i686 -ffunction-sections -O3 -DNDEBUG -fomit-frame-pointer -msse -msse2 -mfpmath=387 -DNDEBUG

-- C++ flags (Debug): -Wall -pthread -march=i686 -ffunction-sections -g -O0 -DDEBUG -D_DEBUG -ggdb3

-- Linker flags (Release):

-- Linker flags (Debug):

-- GUI:

-- GTK+ 2.x: YES

-- GThread: YES

-- Media I/O:

-- ZLib: YES

-- JPEG: TRUE

-- PNG: TRUE

-- TIFF: TRUE

-- JPEG 2000: TRUE

-- OpenEXR: NO

-- OpenNI: NO

-- OpenNI PrimeSensor Modules: NO

-- XIMEA: NO

-- Video I/O:

-- DC1394 1.x: NO

-- DC1394 2.x: YES

-- FFMPEG: YES

-- codec: YES

-- format: YES

-- util: YES

-- swscale: YES

-- gentoo-style: YES

-- GStreamer: NO

-- UniCap: NO

-- PvAPI: NO

-- V4L/V4L2: Using libv4l

-- Xine: NO

-- Other third-party libraries:

-- Use IPP: NO

-- Use TBB: NO

-- Use ThreadingFramework: NO

-- Use Cuda: NO

-- Use Eigen: NO

-- Interfaces:

-- Python: YES

-- Python interpreter: /usr/bin/python2.6 -B (ver 2.6)

-- Python numpy: YES

-- Java: NO

-- Documentation:

-- Sphinx: NO

-- PdfLaTeX compiler: NO

-- Build Documentation: NO

-- Tests and samples:

-- Tests: YES

-- Examples: YES

-- Install path: /usr/local

-- cvconfig.h is in: /home/javier/Desktop/OpenCV-2.3.1/release

-- -----------------------------------------------------------------

-- General configuration for opencv 2.3.1 =====================================

-- Built as dynamic libs?: YES

-- Compiler: /usr/bin/c++

-- C++ flags (Release): -Wall -pthread -march=i686 -ffunction-sections -O3 -DNDEBUG -fomit-frame-pointer -msse -msse2 -mfpmath=387 -DNDEBUG

-- C++ flags (Debug): -Wall -pthread -march=i686 -ffunction-sections -g -O0 -DDEBUG -D_DEBUG -ggdb3

-- Linker flags (Release):

-- Linker flags (Debug):

-- GUI:

-- GTK+ 2.x: YES

-- GThread: YES

-- Media I/O:

-- ZLib: YES

-- JPEG: TRUE

-- PNG: TRUE

-- TIFF: TRUE

-- JPEG 2000: TRUE

-- OpenEXR: NO

-- OpenNI: NO

-- OpenNI PrimeSensor Modules: NO

-- XIMEA: NO

-- Video I/O:

-- DC1394 1.x: NO

-- DC1394 2.x: YES

-- FFMPEG: YES

-- codec: YES

-- format: YES

-- util: YES

-- swscale: YES

-- gentoo-style: YES

-- GStreamer: NO

-- UniCap: NO

-- PvAPI: NO

-- V4L/V4L2: Using libv4l

-- Xine: NO

-- Other third-party libraries:

-- Use IPP: NO

-- Use TBB: NO

-- Use ThreadingFramework: NO

-- Use Cuda: NO

-- Use Eigen: NO

-- Interfaces:

-- Python: YES

-- Python interpreter: /usr/bin/python2.6 -B (ver 2.6)

-- Python numpy: YES

-- Java: NO

-- Documentation:

-- Sphinx: NO

-- PdfLaTeX compiler: NO

-- Build Documentation: NO

-- Tests and samples:

-- Tests: YES

-- Examples: YES

-- Install path: /usr/local

-- cvconfig.h is in: /home/javier/Desktop/OpenCV-2.3.1/release

-- -----------------------------------------------------------------

D. Installing the libraries and headers

make

sudo make install

E. Our first opencv project with Eclipse

1. Open Eclipse and add a new 'Hello World' C++ project

2. Include the following libraries (You can find more information about how to add shared libraries in my previous post: http://linuxtortures.blogspot.com/2012/02/shared-libraries-with-eclipse.html)

3. For our first project we will just open and display an image. Include the following code in your main method:

Note that it is supposed that it exists a picture called 'gnu-linux.jpg' on the folder /home/javier/Desktop/

Compile your project and run it. If you have have problems running your project:

error while loading shared libraries: libmytestsharedlibrary.so: cannot open shared object file: No such file or directory

Create the following file :

/etc/ld.so.conf.d/opencv.conf

Add the following line:

/usr/local/lib

And execute the following command:

sudo ldconfig

Explanations about all this process can be found as well in my previous post.

If everything went ok the system should have prompted your picture: