2.6.8.7. 图像锐化

此示例演示了如何在无噪声情况下通过应用与模糊相反的滤波器来锐化图像。

import scipy as sp
import matplotlib.pyplot as plt

f = sp.datasets.face(gray=True).astype(float)
blurred_f = sp.ndimage.gaussian_filter(f, 3)

filter_blurred_f = sp.ndimage.gaussian_filter(blurred_f, 1)

alpha = 30
sharpened = blurred_f + alpha * (blurred_f - filter_blurred_f)

plt.figure(figsize=(12, 4))

plt.subplot(131)
plt.imshow(f, cmap="gray")
plt.axis("off")
plt.subplot(132)
plt.imshow(blurred_f, cmap="gray")
plt.axis("off")
plt.subplot(133)
plt.imshow(sharpened, cmap="gray")
plt.axis("off")

plt.tight_layout()
plt.show()