16_图像金字塔

# 图像金字塔

import cv2 #opencv的缩写为cv2
import matplotlib.pyplot as plt # matplotlib库用于绘图展示
import numpy as np   # numpy数值计算工具包



def cv_show(img,name):
    cv2.imshow(name,img)
    cv2.waitKey()
    cv2.destroyAllWindows()

img = cv2.imread('D:/pycharm/pycharm-cope/opencv/resource/photo/09_AM.png')
cv_show(img,'img')
print(img.shape)

img = cv2.imread('D:/pycharm/pycharm-cope/opencv/resource/photo/09_AM.png')
up = cv2.pyrUp(img)
cv_show(up,'up')
print(up.shape)

img = cv2.imread('D:/pycharm/pycharm-cope/opencv/resource/photo/09_AM.png')
down = cv2.pyrDown(img)
cv_show(down,'down')
print(down.shape)

up = cv2.pyrUp(up)  # 上采样之后再上采样
cv_show(up,'up')
print(up.shape)

img = cv2.imread('D:/pycharm/pycharm-cope/opencv/resource/photo/09_AM.png')
up = cv2.pyrUp(img)
up_down = cv2.pyrDown(up) # 先上采样再下采样
cv_show(np.hstack((img,up_down)),'up_down')

# 3. 拉普拉斯金字塔

img = cv2.imread('D:/pycharm/pycharm-cope/opencv/resource/photo/09_AM.png')
down = cv2.pyrDown(img)
down_up = cv2.pyrUp(down)
L_1 = img - down_up
cv_show(L_1,'L_1')
print(L_1.shape)