Practical Python and OpenCV- 用OpenCV 畫圖的幾個小例子

畫圖的幾個基本函數：畫線，畫矩形，畫圓 cv2.line, cv2.rectangle, and cv2.circle   1. 一個300*300的畫布，畫一條線。從左上角到右下   import numpy as np import cv2 # Initialize our canvas as a 300x300 with 3 channels, # Red, Green, and Blue

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