【python+opencv边缘提取】

import cv2
import math
import matplotlib.pyplot as plt
import numpy as np
import os


def process_image(image_filename,image_folder1):
    image = cv2.imread(image_filename,0)

    canny = cv2.Canny(image, 0, 100)

    element = cv2.getStructuringElement(0, (7, 7))
    expand_img = cv2.dilate(canny, element)
    expand_img = cv2.dilate(expand_img, element)
    expand_img = cv2.dilate