Build OpenCV

  1. Download OpenCV and Cmake

  2. Build opencv with cmake

    Cmake configurationCmake configuration
    • Press configure, choose visual studio 2015, finish
    • Then press generate
  3. Open OpenCV.sln under build/

  4. Build it using Debug, Release

    Right click > buildRight click > build
    • right click > build
    • switch to Release mode and build again
  5. [Windows] Setting up environment variable

    • add <opencv>/bin into PATH
      Add new environment variableAdd new environment variable
    • add new env named OpenCV_DIR, value as <opencv>/build
    • it may need logout to apply setting, you can check it by echo %PATH%, echo %OpenCV_DIR%

Build with EXTRA MODULES

  1. In step 2. Build opencv with cmake, press configure
  2. Set up OPENCV_EXTRA_MODULES_PATH to proper path(<opencv_contrib>/modules)
Set OPENCV_EXTRA_MODULES_PATH as opencv_contrib/modulesSet OPENCV_EXTRA_MODULES_PATH as opencv_contrib/modules
  1. Press configure again, then generate

To see more details instructions, see opencv_contrib README


Travis.yml example

title: travis.yml
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language:
- cpp
sudo: required
compiler:
- gcc
# building opencv is time consuming, caching it is better
cache:
apt: true
ccache: true
directories:
- opencv-3.1.0
- opencv_contrib-3.1.0
install:
# OpenCV dependencies - Details available at: http://docs.opencv.org/trunk/doc/tutorials/introduction/linux_install/linux_install.html
- sudo apt-get install -y build-essential
- sudo apt-get install -y cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
- sudo apt-get install -y python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev
# Download v3.1.0 .zip file and extract.
- curl -sL https://github.com/Itseez/opencv/archive/3.1.0.zip > opencv.zip
- unzip -n opencv.zip > log1
# Download EXTRA MODULES and extract.
- curl -sL https://github.com/Itseez/opencv_contrib/archive/3.1.0.zip > opencv_contrib.zip
- unzip -n opencv_contrib.zip > log2
# Create a new 'build' folder.
- cd opencv-3.1.0
- mkdir -p build
- cd build
# if Makefile is cached, then skip cmake opencv
# Set build instructions for Ubuntu distro.
- cat Makefile > l1 || cmake -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-3.1.0/modules 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 ..
# if Makefile is cached, then skip make opencv
# Run 'make' with four threads.
- cat Makefile > l2 ||make -j5 > make_log
# Install to OS.
- sudo make install
# Add configuration to OpenCV to tell it where the library files are located on the file system (/usr/local/lib)
- sudo sh -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'
- sudo ldconfig
- echo "OpenCV installed."
# We need to return to the repo "root" folder, so we can then 'cd' into the C++ project folder.
- cd ../../
- ls -al
script:
- cmake CMakeLists.txt
- make
- "./a.out > log1.txt"