This method of installing open-cv is actually building the OpenCV from scratch, compiling, and building. It's powerful.
OpenCV compiled version can also be installed by executing :
sudo apt-get install libilmbase-dev libopenexr-dev libgstreamer1.0-dev libjasper-dev libwebp-dev libatlas-base-dev libavcodec-dev libavformat-dev libswscale-dev libqtgui4 libqt4-test
Install Python OpenCV bindings now with the command:
sudo apt install python3-opencv
If that failed, you can try pip:
pip install opencv-python
Then test to see if import succeeds.
python -c "import cv2"
And if no errors, you have OpenCV installed!
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