Installing OpenCV 2.4.13 or 3.2.0 in MacOS with Java and Python bindings

by Ruben Tous

Type the following commands:

<![CDATA[ #1) Download OpenCV sources, for example in $HOME/Applications/opencv #NOTE: Version 2.4.13: download opencv 2.4.13 from http://opencv.org/downloads.html #NOTE: Version 3.2.0: git clone https://github.com/opencv/opencv.git #2) Install dependencies. You will need Homebrew (https://brew.sh/) brew cask install java brew install cmake brew install ant #3) Build the binaries cd $HOME/Applications/opencv mkdir build cd build sudo cmake -D CMAKE_BUILD_TYPE=RELEASE -D WITH_CUDA=OFF -D WITH_OPENGL=OFF -D BUILD_SHARED_LIBS=OFF -D WITH_TBB=ON -D CMAKE_INSTALL_PREFIX=/usr/local .. sudo make #4) Setup the Python binding cd /Library/Python/2.7/site-packages/ ln -s $HOME/Applications/opencv/build/lib/cv2.so cv2.so #5) Setup the Java binding #Normally you don't need to do nothing, just use this when compiling: -Djava.library.path=$HOME/Applications/opencv/build/lib #If you find problems try: ln -s libopencv_java2413.dylib libopencv_java2413.so ]]>

Testing

by Ruben Tous

Save this code within TestOpenCV.java:

<![CDATA[ import org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.core.CvType; import org.opencv.core.Scalar; class TestOpenCV { static{ System.loadLibrary(Core.NATIVE_LIBRARY_NAME); } public static void main(String[] args) { System.out.println("Welcome to OpenCV " + Core.VERSION); Mat m = new Mat(5, 10, CvType.CV_8UC1, new Scalar(0)); System.out.println("OpenCV Mat: " + m); Mat mr1 = m.row(1); mr1.setTo(new Scalar(1)); Mat mc5 = m.col(5); mc5.setTo(new Scalar(5)); System.out.println("OpenCV Mat data:\n" + m.dump()); } } ]]>

Type the following commands:

<![CDATA[ javac -cp $HOME/Applications/opencv/build/bin/opencv-320.jar TestOpenCV.java java -cp $HOME/Applications/opencv/build/bin/opencv-320.jar:. -Djava.library.path=$HOME/Applications/opencv/build/lib TestOpenCV ]]>