3.3.11.10. 多种降噪滤波器

本示例比较了 scikit-image 中提供的几种降噪滤波器：高斯滤波器、中值滤波器和全变差降噪。

import numpy as np
import matplotlib.pyplot as plt
from skimage import data
from skimage import filters
from skimage import restoration

coins = data.coins()
gaussian_filter_coins = filters.gaussian(coins, sigma=2)
med_filter_coins = filters.median(coins, np.ones((3, 3)))
tv_filter_coins = restoration.denoise_tv_chambolle(coins, weight=0.1)

plt.figure(figsize=(16, 4))
plt.subplot(141)
plt.imshow(coins[10:80, 300:370], cmap="gray", interpolation="nearest")
plt.axis("off")
plt.title("Image")
plt.subplot(142)
plt.imshow(gaussian_filter_coins[10:80, 300:370], cmap="gray", interpolation="nearest")
plt.axis("off")
plt.title("Gaussian filter")
plt.subplot(143)
plt.imshow(med_filter_coins[10:80, 300:370], cmap="gray", interpolation="nearest")
plt.axis("off")
plt.title("Median filter")
plt.subplot(144)
plt.imshow(tv_filter_coins[10:80, 300:370], cmap="gray", interpolation="nearest")
plt.axis("off")
plt.title("TV filter")
plt.show()