Raspberry Pi 3 Cookbook for Python Programmers - Third Edition

How to do it...

1. Import the Computer Vision package – cv2:

import cv2 

2. Import the numerical Python package – numpy as np:

import numpy as np 

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

image = cv2.imread('image_4.jpg')

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

cv2.imshow("Original", image) 

5. Wait until any key is pressed:

cv2.waitKey(0) 

6. Given shape and type, fill it with ones:

# np.ones(shape, dtype) 
# 5 x 5 is the dimension of the kernel, uint8: is an unsigned integer (0 to 255) 
kernel = np.ones((5,5), dtype = "uint8") 

7. cv2.erode is the built-in function used for erosion:

# cv2.erode(image, kernel, iterations) 
erosion = cv2.erode(image, kernel, iterations = 1) 

8. Display the image after erosion using ...