Learning OpenCV with C in Linux

by Gary Bradski and Adrian Kaehler

Overview

Downloading and Installing OpenCV

Getting OpenCV Source Code

• Getting the Latest Stable OpenCV Version
You can download the OpenCV source from: http://opencv.org/releases.html
• Getting the Cutting-edge OpenCV from the Git Repository

git clone https://github.com/opencv/opencv.git
git clone https://github.com/opencv/opencv_contrib.git

Required Packages

• GCC 4.4.x or later
• CMake 2.8.7 or higher
Download the source code from https://cmake.org/download

tar xzf cmake-3.9.0.tar.gz
cd cmake-3.9.0
./bootstrap
cmake
make
sudo make install

• Git
• GTK+2.x or higher, including headers (libgtk2.0-dev)
• pkg-config
• Python 2.6 or later and Numpy 1.5 or later with developer packages (python-dev, python-numpy)
• ffmpeg or libav development packages: libavcodec-dev, libavformat-dev, libswscale-dev
• [optional] libtbb2 libtbb-dev
• [optional] libdc1394 2.x
• [optional] libjpeg-dev, libpng-dev, libtiff-dev, libjasper-dev, libdc1394-22-dev
• [optional] CUDA Toolkit 6.5 or higher

Building OpenCV from Source Using CMake

• Create a temporary directory
The generated Makefiles, project files as well the object files and output binaries are put there.

cd ~/opencv
mkdir build
cd build

• Configuring

cmake [] 

For ex.,

cmake /home/jerry/personal/opencv/opencv-3.2.0

Options:
• Building python
• Building java
• Some parameters
• build type:
CMAKE_BUILD_TYPE=Release\Debug
• to build with modules from opencv_contrib
set OPENCV_EXTRA_MODULES_PATH to
• set BUILD_DOCS for building documents
• set BUILD_EXAMPLES to build all examples
• Build
Recomend to do it in several threads. For example,runs 7 jobs in parallel

make -j7