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Install OpenCV

How to Install OpenCV on Raspberry Pi 3 Model B+

Prerequisite(s):

Update

pi@raspberry:~ $ sudo apt -y install libjpeg-dev \
	libtiff5-dev \
	libjasper-dev \
	libpng12-dev \
	libavcodec-dev \
	libavformat-dev \
	libswscale-dev \
	libv4l-dev \
	libxvidcore-dev \
	libx264-dev

pi@raspberry:~ $ sudo pip install opencv-python
pi@raspberry:~ $ sudo pip install opencv-contrib-python

Note: Go to Step 8 and you are done!

1 - Install OpenCV Prerequisite

pi@raspberry:~ $ sudo apt-get update
pi@raspberry:~ $ sudo apt-get upgrade
pi@raspberry:~ $ sudo rpi-update

pi@raspberry:~ $ sudo reboot
pi@raspberry:~ $ sudo apt-get install -y build-essential cmake pkg-config \
	ffmpeg \
	git \
	libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev \
	libavcodec-dev libavformat-dev libswscale-dev libv4l-dev \
	libxvidcore-dev libx264-dev \
	libgtk2.0-dev libgtk-3-dev \
	libcanberra-gtk* \
	libatlas-base-dev gfortran \
	python2.7-dev python3-dev
  
pi@raspberry:~ $ sudo reboot

2 - Download OpenCV

pi@raspberry:~ $ cd ~
pi@raspberry:~ $ sudo wget -O opencv.zip https://github.com/opencv/opencv/archive/3.4.3.zip
pi@raspberry:~ $ sudo unzip opencv.zip
pi@raspberry:~ $ sudo rm -rf opencv.zip

pi@raspberry:~ $ sudo wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/3.4.3.zip
pi@raspberry:~ $ sudo unzip opencv_contrib.zip
pi@raspberry:~ $ sudo rm -rf opencv_contrib.zip

pi@raspberry:~ $ sudo reboot
pi@raspberry:~ $ sudo pip3 install numpy

3 - Create or Activate Python Virtual Environment

pi@raspberry:~ $ sudo mkvirtualenv my-env -p python3
pi@raspberry:~ $ sudo workon my-env

4 - Compile OpenCV

(my-env) pi@raspberry:~ $ cd opencv-3.4.3
(my-env) pi@raspberry:~ $ sudo mkdir build
(my-env) pi@raspberry:~ $ cd build
(my-env) pi@raspberry:~ $ sudo cmake \
	-D CMAKE_BUILD_TYPE=RELEASE \
	-D CMAKE_INSTALL_PREFIX=/usr/local \
	-D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.4.3/modules \
	-D BUILD_EXAMPLES=OFF \
	-D INSTALL_C_EXAMPLES=OFF \
	-D INSTALL_PYTHON_EXAMPLES=OFF \
	-D BUILD_NEW_PYTHON_SUPPORT=ON \
	-D ENABLE_NEON=ON \
	-D ENABLE_VFPV3=ON \
	-D BUILD_TESTS=OFF ..

(my-env) pi@raspberry:~ $ sudo reboot

5 - Make OpenCV

pi@raspberry:~ $ sudo workon my-env
(my-env) pi@raspberry:~ $ cd opencv-3.4.3/build
(my-env) pi@raspberry:~ $ sudo make -j4 #make with 4 threads - takes 2 hours min

6 - Install OpenCV Make

(my-env) pi@raspberry:~ $ sudo make install
(my-env) pi@raspberry:~ $ sudo ldconfig

7 - Initialise OpenCV and Link in Virtual Environment

(my-env) pi@raspberry:~ $ cd /usr/local/lib/python3.5/dist-packages/
(my-env) pi@raspberry:~ $ sudo cp cv2.cpython-35m-arm-linux-gnueabihf.so cv2.so  
(my-env) pi@raspberry:~ $ cd ~/.virtualenvs/my-env/lib/python3.5/site-packages/
(my-env) pi@raspberry:~ $ sudo ln -s /usr/local/lib/python3.5/dist-packages/cv2.so cv2.so #sym-link binding

(my-env)pi@raspberry:~ $ sudo pip install -U numpy

If above mentioned packages path does not exist then

(my-env) pi@raspberry:~ $ python
>>> import sys
>>> site_packages = next(p for p in sys.path if 'site-packages' in p)
>>> print(site_packages)
'PRINT SITE PACKAGES PATH'
>>>

Ctrl+D

(my-env) pi@raspberry:~ $ sudo reboot

8 - Verify OpenCV Working Correctly

pi@raspberry:~ $ workon my-env
(my-env) pi@raspberry:~ $ source ~/.profile
(my-env) pi@raspberry:~ $ python
>>> import cv2
>>> cv2.__version__
'3.3.0'
>>>

Ctrl+D

Remove OpenCV

(my-env) pi@raspberry:~ $ sudo apt-get remove -y ffmpeg
(my-env) pi@raspberry:~ $ sudo apt-get --purge remove libav-tools
(my-env) pi@raspberry:~ $ sudo apt-get --purge autoremove

(my-env) pi@raspberry:~ $ sudo pkg-config --modversion opencv
(my-env) pi@raspberry:~ $ sudo dpkg -l libopencv*
(my-env) pi@raspberry:~ $ sudo apt-get purge libopencv*
(my-env) pi@raspberry:~ $ sudo dpkg -r opencv
(my-env) pi@raspberry:~ $ sudo apt-get remove python-opencv

(my-env) pi@raspberry:~ $ cd opencv-3.4.3/build/
(my-env) pi@raspberry:~ $ sudo make uninstall
(my-env) pi@raspberry:~ $ sudo apt-get autoremove \
	opencv-doc \
	opencv-data \
	libopencv-dev \
	libopencv2.4-java \
	libopencv2.4-jni \
	python-opencv \
	libopencv-core2.4 \
	libopencv-gpu2.4 \
	libopencv-ts2.4 \
	libopencv-photo2.4 \
	libopencv-contrib2.4 \
	libopencv-imgproc2.4 \
	libopencv-superres2.4 \
	libopencv-stitching2.4 \
	libopencv-ocl2.4 \
	libopencv-legacy2.4 \
	libopencv-ml2.4 \
	libopencv-video2.4 \
	libopencv-videostab2.4 \
	libopencv-objdetect2.4 \
	libopencv-calib3d2.4 
(my-env) pi@raspberry:~ $ sudo dpkg --get-selections | grep -v deinstall | grep opencv