Raspberry Pi Projects: raspberry pi opencv

Install openCV on Raspberry Pi

In this blog post I demonstrated how to install OpenCV 3 with Python 2.7 and Python 3 on Raspberry pi 3B.

What is OpenCV?
OpenCV (Open Source Computer Vision Library) is an open source computer vision and machine learning software library.
https://opencv.org/about.html

Hardware

Raspberry Pi 3B Board with SD card and accessories.

Software and Library

Raspbien Stretch OS
OpenCV 3.3.0

Install OpenCV on Raspberry Pi

Update First.

sudo apt-get update sudo apt-get upgrade sudo rpi-update

Cmake (builder and compiler)

sudo apt-get install build-essential cmake pkg-config git

dependencies Image และ Video IO

sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev sudo apt-get install libxvidcore-dev libx264-dev

HiGUI
sudo apt-get install libgtk2.0-dev libgtk-3-dev
sudo apt-get install libatlas-base-dev gfortran

Python Dev
sudo apt-get install python2.7-dev python3-dev

OpenCV source code

wget -O opencv.zip https://github.com/Itseez/opencv/archive/3.3.0.zip

unzip opencv.zip

wget -O opencv_contrib.zip https://github.com/Itseez/opencv_contrib/archive/3.3.0.zip

unzip opencv_contrib.zip

Build

cd opencv-3.3.0

mkdir build
 cd build
 cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D OPENCV_EXTRA_MODULES_PATH=/home/pi/opencv_contrib-3.3.0/modules \
    -D BUILD_EXAMPLES=ON \
    -D WITH_OPENGL=ON \
    -D WITH_V4L=ON ..

Change Some config

sudo /etc/init.d/dphys-swapfile stop
sudo nano /etc/dphys-swapfile

set CONF_SWAPSIZE 100 (100 MB) to 1024 (1 GB)
then reboot

login again

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

MAKE ( it take 2 hours )
make -j4

sudo make install sudo ldconfig

Test Import OpenCV in python code

python

import cv2

cv2.__version__

Raspberry pi OpenCV Application

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Android and Arduino IoT

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Car or Vehicle Detection is famous technology now.I'd like to use it also for the cheap one you can use raspberry pi board with openCV in python code.