What we must remember that this opencv and what is cv2

opencv is based on a BSD license issuance (also known as open source), cross-platform computer vision library that can run on Linux, Windows, Android and Mac OS. It consists of a series of C functions, and a small amount of C ++ classes constitute lightweight and efficient, and provide an interface Python, Ruby, MATLAB language, etc., many common algorithms implemented image processing and computer vision.

For python, in the time required to write a reference opencv library to import cv2. Which, cv2 opencv is a C ++ namespace name, use it to indicate the call is developed in C ++ opencv interface.

Reference Address:

https://pypi.org/project/opencv-python/

https://blog.csdn.net/saltriver/article/details/78166046