How to build up OpenCV in Linux Back

• Ubuntu 14.04 + OpenCV 3.1.0

1. Be sure to install cmake

sudo apt-get install cmake

2. Download and extract opencv

wget -O opencv-3.1.0.zip https://github.com/Itseez/opencv/archive/3.1.0.zip

upzip opencv-3.1.0.zip

3. Build

3.1 create a build directory

mkdir build && cd build

3.2 use cmake to build

cmake -D WITH_FFMPEG=ON -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 ..

• Problem: qmake: could not exec '/usr/lib/i386-linux-gnu/qt4/bin/qmake': No such file or directory
• Solution: install the qt dependence (sudo apt-get install qt4-qmake libqt4-dev)
• Problem: cmake_cxx_compiler not set after enablelanguage
• Solution: install c++ compiler (sudo apt-get install g++)

• Problem:

  • The first "expected" hash should be always same (for specific OpenCV code version). The second "actual" hash is a signature of received data. And this received data is just broken due some reasons (firewall policy restrictions / other network problems / other software problems, like legacy CMake (2.8.7+ works fine) ): you may try to open file in "mc" editor and check it, sometimes there are messages like "403 forbidden", "timeout", "connection lost".
  • There are some discussion for the similar problem here (but about ffmpeg): #5546 #5895

• Soluton:

  • disable this feature (-DWITH_IPP=OFF)
  • try to download these files manually and put on the right places. You can get these IPPICV files from here in the RAW mode. Script doesn't re-download file if it has right contents and it is located in the right place.

3.3 make

sudo make -j2

• Note: this will take some time to complete.
• Note: without ffmpeg, opencv cannot read a video
• Problem: some lib*.so have undefined link to reference LibXML2
• Solution: you should check the lib when installing ffmpeg. (eg. enable libbluray in ffmpeg will cause problem in ubuntu 14.04 when building opencv)
• Problem: /usr/bin/ld: /usr/local/lib/libavcodec.a(avpacket.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object; recompile with -fPIC.
• Solution: recompile libx264 with --enable-pic and --enable-shared because your system is 64-bit Ubuntu. (More details about installing ffmpeg on Ubuntu 12.04)
• Problem: No rule to make target '/usr/lib/x86_64-linux-gnu/libGL.so'
• Solution: try to re-install libgl with sudo apt-get install --reinstall libgl1-mesa-dev

3.4 make install

sudo make install

4. Configure

sudo sh -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'

sudo ldconfig

5. Reboot the computer

6. Create a project and run it

6.1 Create CMakeLists.txt

vim CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
project( [projectName] )
find_package( OpenCV REQUIRED )
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "lib/")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "lib/")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "bin/")
add_executable( [projectName] [projectName].cpp )
target_link_libraries( [projectName] ${OpenCV_LIBS} )

6.2 Run the project

cmake .

make

./[projectName]

7. some problems about opencv in Visual Studio 2013

• Problems: opencv_core249d.lib(array.obj) : error LNK2038: 檢測到 "RuntimeLibrary" 的不匹配项: 值 "MTd_StaticDebug" 不匹配值 "MDd_DynamicDebug"
• Solution: 工程 -> 屬性 -> c/c++ -> 代碼生成 -> 運行庫 -> 多線程調試(/MTd)
• Problems: 無法啟動此程序, 丟失 opencv_core249.dll
• Solution: 將 opencv_core249.dll, opencv_highgui249.dll 複製到 exe 目錄下即可

8. build OpenCV with extra modles

• build all modules

cd <opencv_build_directory>
cmake -DOPENCV_EXTRA_MODULES_PATH=<opencv_contrib>/modules <opencv_source_directory>
make -j5

• build a specific module

 cmake -DOPENCV_EXTRA_MODULES_PATH=<opencv_contrib>/modules -DBUILD_opencv_legacy=OFF <opencv_source_directory>

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