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Great answer ! Just a small addition since the question was asked for Python, in case any Python user come by (also, this is a full working example)

import cv2
import numpy

img=numpy.zeros((100,100))

radius=5
axes = (radius,radius)
angle=0;
startAngle=0;
endAngle=180;
center=(50,50)
color=255

cv2.ellipse(img, center, axes, angle, startAngle, endAngle, color)