Raspberry Pi 3 Cookbook for Python Programmers - Third Edition

How to do it...

1. Import the Computer Vision package - cv2:

import cv2 
# Import Numerical Python package - numpy as np 
import numpy as np 

2. Read the image using the built-in imread function:

image = cv2.imread('image_5.jpg') 

3. Display the original image using the built-in imshow function:

cv2.imshow("Original", image) 

4. Wait until any key is pressed:

cv2.waitKey(0) 

5. Execute the Canny edge detection system:

# cv2.Canny is the built-in function used to detect edges 
# cv2.Canny(image, threshold_1, threshold_2) 
canny = cv2.Canny(image, 50, 200) 

6. Display the edge detected output image using the built-in imshow function:

cv2.imshow("Canny Edge Detection", canny) 

7. Wait until any key is pressed:

cv2.waitKey(0)

8. Execute the contour detection ...