Drawing Shapes on Images with OpenCV in Python

OpenCV is a powerful library that enables arbitrary image editing and processing, making it suitable for computer‑vision tasks.

The following example shows how to specify the stroke size and draw basic geometric shapes on an image using Python.

Example: Drawing Shapes

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# @Time    : 2021/7/17 下午9:53
# @Author  : huaan

import cv2 as cv

img = cv.imread("one.jpg")
# Draw rectangle
# Top‑left corner (x, y), width w and height h
x, y, w, h = 100, 100, 100, 100
cv.rectangle(img, (x, y, x + w, y + h), color=(0, 255, 0), thickness=2)  # BGR

# Draw circle
x, y, r = 200, 200, 100
cv.circle(img, center=(x, y), radius=r, color=(0, 255, 255), thickness=2)

# Display image
cv.imshow("rectangle_img", img)
cv.waitKey(0)
cv.destroyAllWindows()