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OpenCV-RaspberryPi.md

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Install OpenCV on Raspberry Pi

A. 간단한 방법

sudo apt-get install python-opencv

B. 복잡한 방법

Reference: https://www.pyimagesearch.com/2018/09/26/install-opencv-4-on-your-raspberry-pi/

1. Enable Camera

sudo -s
raspi-config

5 Interfaceing Option
P1 Camera

apt-get update
apt-get upgrade
reboot

2. Install dependencies

sudo -s
apt-get install build-essential cmake unzip pkg-config libjpeg-dev libpng-dev libtiff-dev libavcodec-dev libavformat-dev libswscale-dev libv4l-dev libxvidcore-dev libx264-dev libgtk-3-dev libcanberra-gtk* libatlas-base-dev gfortran python3-dev libgtk2.0-dev pkg-config

3. Download OpenCV

cd ~

3-1. OpenCV-4.0.0-alpha

wget -O opencv.zip https://github.com/opencv/opencv/archive/4.0.0-alpha.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.0.0-alpha.zip
unzip opencv.zip
unzip opencv_contrib.zip
mv opencv-4.0.0-alpha opencv
mv opencv_contrib-4.0.0-alpha opencv_contrib

3-2. OpenCV-3.4.4 (X)

wget -O opencv.zip https://github.com/opencv/opencv/archive/3.4.4.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/3.4.4.zip
unzip opencv.zip
unzip opencv_contrib.zip
mv opencv-3.4.4 opencv
mv opencv_contrib-3.4.4 opencv_contrib

4. CMake and compile

cd opencv
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \
    -D ENABLE_NEON=ON \
    -D ENABLE_VFPV3=ON \
    -D BUILD_TESTS=OFF \
    -D INSTALL_PYTHON_EXAMPLES=OFF \
    -D BUILD_EXAMPLES=OFF ..

5. Increase SWAP

nano /etc/dphys-swapfile

# set size to absolute value, leaving empty (default) then uses computed value
#   you most likely don't want this, unless you have an special disk situation
CONF_SWAPSIZE=2048

/etc/init.d/dphys-swapfile stop
/etc/init.d/dphys-swapfile start

6. Compile OpenCV

cd ~
cd opencv/build

make -j4
make install
ldconfig

7. Test OpenCV

$ python

>> import cv2
>> exit()

Uninstall OpenCV on Raspberry Pi

reference: http://www.srccodes.com/p/article/56/uninstall-remove-opencv-raspberry-pi-jessie-debain-make-uninstall-open-source-computer-vision-opencvlib

A. Installed using apt-get

sudo -s
pkg-config --modversion opencv
dpkg -l libopencv*
apt-get purge libopencv*
dpkg -r opencv

B. Installed using make

sudo -s
cd ~/opencv/build
make uninstall