Ubuntu – How to install OpenCV 3.1 for Python 3.5 On Ubuntu 16.04 LTS

16.04opencvpython3

How to install OpenCV version 3.1 on Ubuntu 16.04 LTS to work with Python 3.5.1?

I tried this on a VM but obviously that is useful to do if you want to work with Python 2.

Best Answer

I have OpenCV version 3.1 on Ubuntu 16.04 LTS to work with Python 3.5.1. At the latest version it's fixed, try:

http://cyaninfinite.com/tutorials/installing-opencv-in-ubuntu-for-python-3/

But I didn't download dev python and OpenCV, I took directly from github:

EDIT:

Here are the instructions I tested successfully and mentioned in the link above:

Update the repository: sudo apt-get update

Download the required packages to compile OpenCV:

sudo apt-get install build-essential cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev

Install the developer packages for Python3.5: sudo apt-get install python3.5-dev
Copy the dev files:python3.5-config --includes The output should be similar to: -I/usr/include/python3.5m -I/usr/include/x86_64-linux-gnu/python3.5m. The first part of the output is the expected location & the second part shows the current location of the config file. To solve this problem, we’ll copy the file from the current location to the expected location: sudo cp /usr/include/x86_64-linux-gnu/python3.5m/pyconfig.h /usr/include/python3.5m/
Create a temporary directory, move into it and run: git clone https://github.com/Itseez/opencv.git. This will download OpenCV 3. Then rename the folder opencv to opencv-3

Create a build directory, move to it and run:

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ../opencv-3

After the process is finished, run make and then sudo make install.
Enjoy.

Related Solutions

Ubuntu – Cmake error when I try install Opencv 3.1

It is a known issue with 16.04. A bug report has been filled already and should be fixed soon. For now, I fixed it doing this:

sudo -i
mkdir /usr/include/ffmpeg
cd /usr/include/ffmpeg
ln -sf /usr/include/x86_64-linux-gnu/libavcodec/*.h ./
ln -sf /usr/include/x86_64-linux-gnu/libavformat/*.h ./
ln -sf /usr/include/x86_64-linux-gnu/libswscale/*.h ./

Basically, you create links in /usr/include/ffmpeg to all .h files in the directories: /usr/include/x86_64-linux-gnu/libavcodec/ /usr/include/x86_64-linux-gnu/libavformat/ /usr/include/x86_64-linux-gnu/libswscale/

I managed to avoid the sys/videoio.h issue and the linux/videodev.h issue by using the following cmake command (note you must have opencv_contrib checkedout and adjust the relative path below to your case). You also must run this cmake command twice or the Python3 part for some reason does not gets picked up. I do not know why the cmake command below fixed the issues to me, I just found it out after a long investigation (maybe with the cmake command below the fix above is not even necessary, I do not know).

cmake \
  -D CMAKE_BUILD_TYPE=RELEASE \
  -D CMAKE_INSTALL_PREFIX=/usr/local \
  -D WITH_TBB=ON \
  -D WITH_V4L=ON \
  -D WITH_QT=ON \
  -D WITH_OPENGL=ON \
  -D WITH_CUDA=ON \
  -D ENABLE_FAST_MATH=1 \
  -D CUDA_FAST_MATH=1 \
  -D CUDA_NVCC_FLAGS="-D_FORCE_INLINES" \
  -D WITH_CUBLAS=1 \
  -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \
  -D BUILD_TESTS=OFF \
  -D BUILD_PERF_TESTS=OFF \
  -D BUILD_OPENCV_PYTHON3=1 \
  -D PYTHON3_EXECUTABLE=$(which python3) \
  -D PYTHON3_INCLUDE_DIR=$(python3 -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())") \
  -D PYTHON3_LIBRARIES=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())") ..

Ubuntu – How to install Python 3.5.1 on Ubuntu 16.04 LTS

Python 3.5.1 is installed on Ubuntu 16.04 by default. You can verify that by running the command python3 --version in a terminal.

Now, IDLE for Python 3 is in the package idle3 and part of the default Python distribution but it's not installed on Ubuntu by default. You can do so with Software Center or your favourite package manager. On the command-line you can run:

sudo apt-get install idle3

If that gives you an error as you say in the comments, please edit your question with the "edit" link below it to include the error messages verbatim (and send me a message in the comments to notify me of the change), or ask a new question with the same information.

Best Answer

Related Solutions

Ubuntu – Cmake error when I try install Opencv 3.1

Ubuntu – How to install Python 3.5.1 on Ubuntu 16.04 LTS

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