OpenCV 3 Computer Vision with Python Cookbook

How to do it...

Here are the steps needed to complete this recipe:

1. Import the modules:

import cv2import matplotlib.pyplot as plt

2. Load the test image:

image = cv2.imread('../data/Lena.png')

3. Detect the edges using the Canny algorithm:

edges = cv2.Canny(image, 200, 100)

4. Visualize the results:

plt.figure(figsize=(8,5))plt.subplot(121)plt.axis('off')plt.title('original')plt.imshow(image[:,:,[2,1,0]])plt.subplot(122)plt.axis('off')plt.title('edges')plt.imshow(edges, cmap='gray')plt.tight_layout()plt.show()