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I'm using this: http://docs.opencv.org/3.1.0/d7/d9f/tutorial_linux_install.html to build opencv on ununtu 16LTS for Python 3. On step 4 in Building OpenCV from Source Using CMake i'm stuck with typing in the right parameters. Could you, please check my variants, because i could only find folders and no files with suggested extensions. Also, shall i type a flag -D before each param?

         -D PYTHON3_EXECUTABLE=$HOME/anaconda3/bin
         -D PYTHON_INCLUDE_DIR=/usr/include/python3.5
         -D PYTHON_INCLUDE_DIR2=/usr/include/x86_64-linux-gnu/python3.5m
         -D PYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython3.5m.a
         -D PYTHON3_NUMPY_INCLUDE_DIRS= I dont have anything similar like path in the tutorial, but i have a "numpy" folder in /usr/include/python3.5!
   So what should i do?

Also, what shall i write in:

  • -D CMAKE_INSTALL_PREFIX
  • OPENCV_EXTRA_MODULES_PATH (in this tutrial(previus step), o downloaded opencv-contrib. So should i type in: OPENCV_EXTRA_MODULES_PATH=/home/vladislav/opencv/opencv_contrib
  • BUILD_DOCS
  • BUILD_EXAMPLES

ERROR: When i run as it is told in the tutorial, i got mistakes like this: CMake Error: The source directory "/home/vladislav/opencv/build/PYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython3.5m.so" does not exist.

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That's an example of my working cmake params (Ubuntu 16.04, Latest OpenCV, Python 3.5), but you need to adjust the paths by your own.

cmake -D CMAKE_BUILD_TYPE=RELEASE \        
    -D PYTHON3_EXECUTABLE=/usr/bin/python3.5 \    
    -D PYTHON3_INCLUDE_DIR=/usr/include/python3.5 \ 
    -D PYTHON3_LIBRARY=/usr/lib/python3.5/config-3.5m-x86_64-linux-gnu/libpython3.5.so \
    -D PYTHON3_NUMPY_INCLUDE_DIR=/usr/local/lib/python3.5/dist-packages/numpy/core/include \
    -D PYTHON3_PACKAGES_PATH=/usr/local/lib/python3.5/dist-packages \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \
    -D BUILD_EXAMPLES=ON ..

in my case opencv_contrib is in the same folder like opencv your cmake command starts from your build folder (mkdir build in opencv folder) so in my case I need to jump to dirs back and important: refer to the opencv_contrib/modules folder

Sometimes it's a little bit clearer to use the cmake-gui

sudo apt install cmake-gui

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