Image Pyramids – OpenCV 3.4 with python 3 Tutorial 23

Source code:

import cv2
import numpy as np

img = cv2.imread("hand.jpg")

# Gaussian Pyramid
layer = img.copy()
gaussian_pyramid = [layer]
for i in range(6):
    layer = cv2.pyrDown(layer)
    gaussian_pyramid.append(layer)

# Laplacian Pyramid
layer = gaussian_pyramid[5]
cv2.imshow("6", layer)
laplacian_pyramid = [layer]
for i in range(5, 0, -1):
    size = (gaussian_pyramid[i - 1].shape[1], gaussian_pyramid[i - 1].shape[0])
    gaussian_expanded = cv2.pyrUp(gaussian_pyramid[i], dstsize=size)
    laplacian = cv2.subtract(gaussian_pyramid[i - 1], gaussian_expanded)
    laplacian_pyramid.append(laplacian)
    cv2.imshow(str(i), laplacian)



cv2.imshow("Original image", img)
cv2.waitKey(0)
cv2.destroyAllWindows()

Files:

1. hand.jpg