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OpenCV 4 with Python Blueprints: Build creative computer vision projects with the latest version of OpenCV 4 and Python 3, 2nd Edition 2, Gevorgyan, Dr. Menua, Mamikonyan, Arsen, Beyeler, Michael, eBook - Amazon.com
OpenCV Color Detection and Filtering with Python - bluetin.io
Python OpenCV filter2D() function - A Complete Guide - AskPython
Image Processing and Analysis - Scilab: Python: Image Filtering in Python and OpenCV