Line (img, start point, end point, color...)
Img: specify which picture to draw on
Start point, end point: specify the start and end position of the line
Color, Lineweight, Linetype
Shift: coordinate scaling
import cv2
import numpy as np
# 绘制一个黑色背景图
img=np.zeros((480,640,3),np.uint8)
# 画直线
cv2.line(img,(10,20),(300,400),(0,0,255),5)
# 显示
cv2.imshow('img',img)
cv2.waitKey(0)
