OpenCV-python 实现低通滤波、高通滤波、带通滤波

import cv2
import numpy as np
import matplotlib.pyplot as plt
import math
plt.rcParams['font.sans-serif'] = ['SimHei']  # 用来正常显示中文标签
plt.rcParams['axes.unicode_minus'] = False    # 用来正常显示负号


def salt_pepper(image, salt, pepper):
    """
    添加椒盐噪声的图像
    :param image: 输入图像
    :param salt: 盐比例
    :param pepper: 椒比例
    :return: 添加了椒盐噪声的图像
    """
    height = image.shape[0]
    width = image.shape[1]
    pertotal = salt + pepper    #总噪声占比
    noise_image = image.copy()
    noise_num = int(pertotal * height * width)
    for i in range(noise_num):
        rows = np.random.randint(0, height-1)
        cols = np.random.randint(0,width-1)
        if(np.random.randint(0,100)