opencv install

linux

prereq: ubuntu 16:04 or 18:04

sudo apt-get install -y build-essential cmake # GUI (if you want to use GTK instead of Qt, replace 'qt5-default' with 'libgtkglext1-dev' and remove '-DWITH_QT=ON' option in CMake): sudo apt-get install -y libvtk6-dev libgtkglext1-dev # GUI qt # sudo apt install -y qt5-default # Media I/O: sudo apt-get install -y zlib1g-dev libjpeg-dev libwebp-dev libpng-dev libtiff5-dev libjasper-dev libopenexr-dev libgdal-dev # Video I/O: sudo apt-get install -y libdc1394-22-dev libavcodec-dev libavformat-dev libswscale-dev libtheora-dev libvorbis-dev libxvidcore-dev libx264-dev yasm libopencore-amrnb-dev libopencore-amrwb-dev libv4l-dev libxine2-dev # Parallelism and linear algebra libraries: sudo apt-get install -y libtbb-dev libeigen3-dev # Python 2 & 3: sudo apt-get install -y python-dev python-tk python-numpy python3-dev python3-tk python3-numpy # others sudo apt-get install -y libopenexr-dev # Java: # sudo apt-get install -y ant default-jdk # Documentation: # sudo apt-get install -y doxygen

download sources from release or …

wget https://github.com/opencv/opencv/archive/3.4.1.zip unzip 3.4.1.zip rm 3.4.1.zip mv opencv-3.4.1 OpenCV cd OpenCV

… from git (better if compiling darknet)

cd /opt
git clone -b 3.4 --depth 1 https://github.com/opencv/opencv.git opencv.git
ln -sf opencv.git OpenCV
cd OpenCV

compile

mkdir build cd build # cmake -DWITH_QT=ON -DWITH_OPENGL=ON -DFORCE_VTK=ON -DWITH_TBB=ON -DWITH_GDAL=ON -DWITH_XINE=ON -DBUILD_EXAMPLES=ON .. # cmake -DWITH_OPENGL=ON -DFORCE_VTK=ON -DWITH_TBB=ON -DWITH_GDAL=ON -DWITH_XINE=ON -DENABLE_PRECOMPILED_HEADERS=OFF -DWITH_JASPER=OFF .. # with openCL # cmake -DWITH_OPENGL=ON -DFORCE_VTK=ON -DWITH_TBB=ON -DWITH_GDAL=ON -DWITH_XINE=ON -DENABLE_PRECOMPILED_HEADERS=OFF -DWITH_JASPER=OFF -DWITH_OPENCL=ON .. # with openCL and CUDA #cmake -DWITH_OPENGL=ON -DFORCE_VTK=ON -DWITH_TBB=ON -DWITH_GDAL=ON -DWITH_XINE=ON -DENABLE_PRECOMPILED_HEADERS=OFF -DWITH_JASPER=OFF -DWITH_OPENCL=ON -DWITH_CUDA=ON .. cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local .. time make -j4 # 13:42 on flinx # 5:02 on mostro

install

sudo make install sudo ldconfig

android method 1

prereq:

substitute /opt/android-sdk/tools with https://dl.google.com/android/repository/tools_r25.2.5-linux.zip

android sdk in /opt/android-sdk

cd /opt
git clone -b 3.4 --depth 1 https://github.com/opencv/opencv.git opencv.git

vars=dict(BUILD_ANDROID_PROJECTS='OFF') ABIs = [ #ABI("2", "armeabi-v7a", "arm-linux-androideabi-4.9", cmake_vars=dict(ANDROID_ABI='armeabi-v7a with NEON')), #ABI("1", "armeabi", "arm-linux-androideabi-4.9", cmake_vars=dict(WITH_TBB='OFF')), ABI("3", "arm64-v8a", "aarch64-linux-android-4.9", cmake_vars=vars), ABI("5", "x86_64", "x86_64-4.9", cmake_vars=vars), #ABI("4", "x86", "x86-4.9"), ]

create /opt/OpenCV-android-sdk-compiled

cd /opt/opencv.git
python ./platforms/android/build_sdk.py \
--config ndk.config.py \
--ndk_path /opt/android-sdk/ndk-bundle \
--sdk_path /opt/android-sdk \
/opt/OpenCV-android-sdk-compiled .

android method 2

Thank you to everyone for your help.

I recently had to build OpenCV for Android from source (because I wanted to link against LLVM libc++ STL instead of GNU STL). In case it’s useful to anyone else, here are some quick instructions on how I did it:

$ mkdir ~/sdk && cd ~/sdk
$ wget https://dl.google.com/android/repository/tools_r25.2.5-macosx.zip && unzip tools_r25.2.5-macosx.zip
$ tools/android sdk
Select and install the following two packages:
Android SDK Build-tools 27.0.3
Android 8.1.0 (API 27) -> SDK Platform 27
$ mkdir ~/opencv && cd ~/opencv
$ git clone https://github.com/opencv/opencv.git
$ cd ~/opencv/opencv
$ wget https://gist.githubusercontent.com/ngriffiths/296e2fc16b8586705712d50bdfe746b0/raw/350a8cb6497bfe367dda75b7bb202d6c7ce09a72/always-use-ant__find_android.patch && git apply always-use-ant__find_android.patch
$ cd platforms/android
$ ANDROID_SDK=~/sdk ANDROID_HOME=~/sdk ./build_sdk.py --config ndk-16.config.py ~/opencv/build

I already had the ANDROID_NDK environment variable set to a local NDK 16 installation.

To compile against libc++, I then changed ANDROIDSTL=“gnustlstatic” in buildsdk.py to ANDROIDSTL=“libc++shared” and ran buildsdk.py again.

One unusual thing I couldn’t work out was why the static libs I built were much larger than those in the official distribution (e.g. my arm64-v8a/libopencv_core.a is 75.8MB vs 7.5MB). @peterchaula peterchaula commented on Apr 11

@ngriffiths you need to strip out intel threading libs (TBB). That'll shave off ~15MB off your library.