OpenCV 3 Computer Vision with Python Cookbook

How to do it...

1. Open an image and get its width and height. Also, define a simple function that returns a random point inside our image:

import cv2, randomimage = cv2.imread('../data/Lena.png')w, h = image.shape[1], image.shape[0]def rand_pt(mult=1.):    return (random.randrange(int(w*mult)),            random.randrange(int(h*mult)))

2. Let's draw something! Let's go for circles:

cv2.circle(image, rand_pt(), 40, (255, 0, 0))cv2.circle(image, rand_pt(), 5, (255, 0, 0), cv2.FILLED)cv2.circle(image, rand_pt(), 40, (255, 85, 85), 2)cv2.circle(image, rand_pt(), 40, (255, 170, 170), 2, cv2.LINE_AA)

3. Now let's try to draw lines:

cv2.line(image, rand_pt(), rand_pt(), (0, 255, 0))cv2.line(image, rand_pt(), rand_pt(), (85, 255, 85), 3)cv2.line(image, rand_pt(), ...