opencv-tutorial

Windows Installation

1. Download & Install Anaconda Python Package

• https://www.anaconda.com/download

2. Download and Run OpenCV

• https://opencv.org/releases.html

3. For Python2.7

• Go to C:\opencv\build\python\2.7\x64
• copy cv2.py and place in C:\Users\Anaconda2\Lib\site-packages

       For Python3.6

• Open command prompt and type :

  $ pip install opencv-python
  

MacOS Installation

1. Install Xcode

sudo xcode-select --install

2. Install homebrew and add the following line to the end of ~/.bashrc

export PATH=/usr/local/bin:$PATH

        Use source command to load the changes in corresponding file.

source ~/.bashrc

3. Install Python

brew install python python3
brew link python
brew link python3

4. Install pip3 for python3

brew postinstall python3

5. Install virtualenv and virtualenvwrapper

pip3 install virtualenv virtualenvwrapper

        Add following lines to the ~/.bashrc

export VIRTUALENVWRAPPER_PYTHON=/usr/local/bin/python3
export WORKON_HOME=$HOME/.virtualenvsexport
PROJECT_HOME=$HOME/Develsource /usr/local/bin/virtualenvwrapper.sh

6. Install OpenCV

brew install opencv

7. Add OpenCV site path to global site path

echo /usr/local/opt/opencv/lib/python3.6/site-packages >> /usr/local/lib/python3.6/site-packages/opencv3.pth

8. Create a virtual environment

mkvirtualenv cv-py3 -p python3
workon cv-py3
deactivate

9. Install lib in ~/.virtualenvs.

pip install numpy scipy scikit-image matplotlib scikit-learn

10. Link previously installed OpenCV library to this virtual invironment

cd ~/.virtualenvs/cv-py3/lib/python3.6/site-packages/
ln -s /usr/local/opt/opencv@3/lib/python3.6/site-packages/cv2.cpython-36m-darwin.so cv2.so

11. Check

workon cv-py3
python3
import cv2
print(cv2.__version__)

Linux Installation

1. Enter these command in Terminal

$ sudo apt-get update 
$ sudo apt-get upgrade 
$ sudo apt-get install build-essential   cmake git pkg-config 
$ sudo apt-get install libjpeg8-dev   libtiff4-dev libjasper-dev libpng12-dev 
$ sudo apt-get install libgtk2.0-dev 
$ sudo apt-get install libavcodec-dev   libavformat-dev libswscale-dev libv4l-dev 
$ sudo apt-get install   libatlas-base-dev gfortran 
$ cd ~ 
$ git clone   https://github.com/Itseez/opencv.git 
$ cd opencv 
$ git checkout 3.0.0 
$ cd ~/opencv 
$ mkdir build 
$ cd build 
$ cmake -D CMAKE_BUILD_TYPE=RELEASE \ 
        -D   CMAKE_INSTALL_PREFIX=/usr/local \ 
        -D   INSTALL_C_EXAMPLES=ON \ 
        -D   INSTALL_PYTHON_EXAMPLES=ON \ 
        -D   OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \        
        -D   BUILD_EXAMPLES=ON .. 
$ make -j4
$ sudo make install
$ sudo ldconfig