opencv-python学习（十四）：高斯金字塔和拉普拉斯金字塔

要求：拉普拉斯金字塔时，图像大小必须是2的n次方*2的n次方，不然会报错

def pyramid_image(image):
    level = 3 # 金字塔的层数
    temp = image.copy() #拷贝图像
    pyramid_image = []
    for i in range(level):
        dst = cv.pyrDown(temp)
        pyramid_image.append(dst)
        cv.imshow('gaosijinzita' + str(i), dst)
        temp = dst.copy()
    return pyramid_image

# 拉普拉斯金字塔
def laplian_image(image):
    pyramid_images = pyramid_image(image)
    level = len(pyramid_images)
    for i in range(level-1, -1, -1):
        if(i-1) < 0 :
            expand = cv.pyrUp(pyramid_images[i], dstsize=image.shape[:2])
            lpls = cv.subtract(image, expand)
            cv.imshow('lapulasi' + str(i), lpls)
        else:
            expand = cv.pyrUp(pyramid_images[i], dstsize=pyramid_images[i-1].shape[:2])
            lpls = cv.subtract(pyramid_images[i-1], expand)
            cv.imshow('lapulasi' + str(i), lpls)

src = cv.imread('./static/image/blur.jpg')
cv.imshow('yuanlai', src)
laplian_image(src)
cv.waitKey(0)
cv.destroyAllWindows()