title: How to generate circle on image without using opencv functions?
body: <pre><code>import numpy as np
  import cv2
  from google.colab.patches import cv2_imshow
  img=np.zeros((512,512,3),np.uint8)
  img.fill(255)
  circleImg = cv2.circle(img,(256,256),63, (0,0,255), 8)
  circleImg = cv2.circle(img,(256,256),63, (255,0,0), -1)
  cv2_imshow(circleImg)
  </code></pre>
  <p><a href="https://i.stack.imgur.com/0wSpE.jpg" rel="nofollow noreferrer">output</a></p>
  <p>how i can get same output without using opencv functions?</p>