install opencv

1pip install opencv-python
2pip install opencv-contrib-python

1sudo pip3 install opencv-contrib-python

1pip install opencv-python==4.2.0.34

1sudo apt-get install libopencv-dev   # ubuntu c++
2
3download required packages from below link:
4https://docs.opencv.org/4.0.1/d7/d9f/tutorial_linux_install.html
5
6NOTE: you can download required packages by "sudo apt-get install <packages>" or 
7download source code by git using above link
8
9tags: ubuntu, c++, opencv 4 version

1#pip install opencv-python in cmd/bash
2
3import cv2

1curl https://elektronicavoorjou.nl/wp-content/uploads/2020/06/install-openCV.html?_t=1591714866 | bash