Jagged edges around the circle in OpenCV - Python

Question

As the title says, I am trying to fix the jagged edges around the circle I created in OpenCV.

I've tried a few things i.e. cv2.blur(), cv2.filter2D(), they didn't do the trick.

import numpy as np
import cv2
import random

for i in range(5):
    img = np.zeros((512,512,3), np.uint8)
    H = random.choice(list(range(100,500)))
    V = random.choice(list(range(100,500)))
    S = random.choice(list(range(30,150)))

    cv2.circle(img,(H,V), S, (0,0,255), -1)

    img = cv2.resize(img,(750,750))
    f = (3-len(str(i)))*'0'+str(i)
    cv2.imwrite('circle%s.jpg' % f, img)

cv2.destroyAllWindows()

Answer 1

I think you are looking to draw an antialiased outline. You can do that by setting the lineType parameter:

cv2.circle(img,(H,V), S, (0,0,255), -1, lineType=cv2.LINE_AA)