金字塔的应用

案例© Fu Xianjun. All Rights Reserved. 

#导包

import cv2
import numpy as np
A = cv2.imread('apple.png')
A = cv2.resize(A,(256,256),interpolation=cv2.INTER_CUBIC) 
B = cv2.imread('orange.png')
B = cv2.resize(B,(256,256),interpolation=cv2.INTER_CUBIC)
# 生成高斯金字塔
G = A.copy()
gpA = [G]
for i in range(5):
    G = cv2.pyrDown(G)
    gpA.append(G)
    
G = B.copy()
gpB = [G]
for i in range(5):
    G = cv2.pyrDown(G)
    gpB.append(G)
# 产生Laplacian金字塔
lpA = [gpA[5]]
for i in range(5,0,-1):
    GE = cv2.pyrUp(gpA[i])
    L = cv2.subtract(gpA[i-1],GE)
    lpA.append(L)

lpB = [gpB[5]]
for i in range(5,0,-1):
    GE = cv2.pyrUp(gpB[i])
    L = cv2.subtract(gpB[i-1],GE)
    lpB.append(L)
# 合并
LS = []
for la,lb in zip(lpA,lpB):
    rows,cols,dpt = la.shape
    ls = np.hstack((la[:,0:cols//2], lb[:,cols//2:]))
    LS.append(ls)
# 重新构建图像
ls_ = LS[0]
for i in range(1,6):
    ls_ = cv2.pyrUp(ls_)
    ls_ = cv2.add(ls_, LS[i])
# 连接
real = np.hstack((A[:,:cols//2],B[:,cols//2:]))

#输出
cv2.imshow("apple",A)
cv2.imshow("orange",B)
cv2.imshow("Real",real)
cv2.waitKey()
cv2.destroyAllWindows()

原图1

 原图2

效果图