How to draw multi-color segmented circle using OpenCV?

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What is the best way to draw multi-color segmented circle using OpenCV like below?

What I found, it can be:

  1. Using cv.fillPoly Many points are required for an arcs accurate drawing, the number of segments is several hundred;
  2. Using cv.line by rotating the line in a circle;
  3. Using cv.line by rotating whole image like in this similar case.

multicolor segmented circle

opencv python c++
1 Answers

Using cv.ellipse you can draw segments pretty easily:

from matplotlib import pyplot as plt
import cv2
import numpy as np
import random

ANGLE_DELTA = 360 // 8

img = np.zeros((700, 700, 3), np.uint8)
img[::] = 255

for size in range(300, 0, -100):
    for angle in range(0, 360, ANGLE_DELTA):
        r = random.randint(0, 256)
        g = random.randint(0, 256)
        b = random.randint(0, 256)
        cv2.ellipse(img, (350, 350), (size, size), 0, angle, angle + ANGLE_DELTA, (r, g, b), cv2.FILLED)

plt.gcf().set_size_inches((8, 8))
plt.imshow(img)
plt.show()

gives

1

user_62053790
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