Ellipse (img, center point, half of length and width, angle, which angle to start from and end to)
Img: select which picture to draw on
Center point: specify where the center point of the ellipse is
Half of the length and width: the ellipse is drawn in a rectangle. Here, fill in half of the length and width of the rectangle
Angle: rotation angle of rectangle
From which angle: if the angle is 360 degrees, the whole ellipse will be drawn. If the angle is not 360 degrees, the sector will be drawn
To which angle: specific ending angle
import cv2
import numpy as np
# 绘制一个黑色背景图
img=np.zeros((480,640,3),np.uint8)
# 画椭圆
cv2.ellipse(img,(200,300),(100,50),0,0,360,(0,0,255))
# 显示
cv2.imshow('img',img)
cv2.waitKey(0)
