使用拉普拉斯金字塔時，影象必須是2^n*2*m

使用拉普拉斯金字塔先要知道高斯金字塔

這兩種過程是圖片縮小與放大

縮小   reduce =  高斯模糊 + 降取樣（pyrDown）

放大    expand = 擴大（升取樣/pyrUp） + 卷積

#-*-coding:utf-8 -*-
import cv2 as cv

#高斯金字塔
def pyramid_image(image):
    cv.imshow("yuan",image)
    level = 3#金字塔的層數
    temp = image.copy()#拷貝影象
    pyramid_images = []
    for i in range(level):
        dst = cv.pyrDown(temp)
        pyramid_images.append(dst)
        cv.imshow("pyramid"+str(i), dst)
        temp = dst.copy()
    return pyramid_images

#拉普拉斯金字塔
def lpls_image(image):
    pyramid_images = pyramid_image(image)
    level = len(pyramid_images)
    for i in range(level-1, -1, -1):#陣列下標從0開始 i從金字塔層數-1開始減減
        if (i-1)<0:#原圖
            expand = cv.pyrUp(pyramid_images[i])
            lpls = cv.subtract(image, expand)
            cv.imshow("lpls_%s" % i, lpls)
        else:
            expand = cv.pyrUp(pyramid_images[i])
            lpls = cv.subtract(pyramid_images[i-1], expand)
            cv.imshow("lpls_%s" % i, lpls)


img = cv.imread("d://work//1.jpg")
lpls_image(img)
cv.waitKey(0)
cv.destroyAllWindows()