Python基本形态学滤波怎么实现

import numpy as np
import matplotlib.pyplot as plt
import scipy.ndimage as sn

x = np.zeros([20,20])
x[5:15, 5:15] = 1
x_ero = sn.binary_erosion(x)
x_dil = sn.binary_dilation(x)

fig = plt.figure()
ax = fig.add_subplot(1,3,1)
ax.imshow(x)
plt.title("original")
ax = fig.add_subplot(1,3,2)
ax.imshow(x_ero)
plt.title("erosion")
ax = fig.add_subplot(1,3,3)
ax.imshow(x_dil)
plt.title("dilation")
plt.show()

x = np.zeros([20,20])
x[5:15, 5:15] = 1
x[10:12,10:12] = 0
x[2:4, 2:4] = 1

x_open = sn.binary_opening(x)
x_close = sn.binary_closing(x)

fig = plt.figure()
ax = fig.add_subplot(1,3,1)
ax.imshow(x)
plt.title("original")
ax = fig.add_subplot(1,3,2)
ax.imshow(x_open)
plt.title("opening")
ax = fig.add_subplot(1,3,3)
ax.imshow(x_close)
plt.title("closing")
plt.show()

from scipy.misc import ascent
img = ascent()

funcs = {
    "original": lambda x, tmp:x,
    "erosion" : sn.grey_erosion,
    "dilation" : sn.grey_dilation,
    "opening" : sn.grey_opening,
    "closing" : sn.grey_closing
}

fig = plt.figure()
for i, key in enumerate(funcs):
    ax = fig.add_subplot(2,3,i+1)
    plt.imshow(funcs[key](img, (10,10)), cmap=plt.cm.gray)
    plt.title(key)

plt.show()

binary_closing(input, iterations=1, mask=None, border_value=0, brute_force=False)

grey_closing(input, size=None, footprint=None, mode='reflect', cval=0.0)