Practical Python and OpenCV- 用OpenCV 画图的几个小例子

画图的几个基本函数：画线，画矩形，画圆 cv2.line, cv2.rectangle, and cv2.circle   1. 一个300*300的画布，画一条线。从左上角到右下   import numpy as np import cv2 # Initialize our canvas as a 300x300 with 3 channels, # Red, Green, and Blue

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