图像消除纹理

import numpy as np
from PIL import Image
import matplotlib.pyplot as plt
from scipy import ndimage
cov_len=23
img=Image.open("C:/Users/xpp/Desktop/Lena.png", 'r')
img=img.convert('L')
avg_img=[]
for i in range(19):
    px=np.random.randint(0,256-cov_len)
    py=np.random.randint(0,256-cov_len)
    rect=(px,py,px+cov_len,py+cov_len)
    cut_img=img.crop(rect)
    avg_img.append(np.array(cut_img).reshape(-1))
avg_img=np.array(avg_img).mean(axis=0).reshape(cov_len, cov_len)
avg_img=avg_img/avg_img.sum()#加权平均值
i=ndimage.convolve(img,avg_img)
img_result=Image.fromarray(i)
img_result.save('C:/Users/xpp/Desktop/result.png')
plt.imshow(img_result,cmap='gray')
plt.show()