Image manipulation and numpy arrays

This example shows how to do image manipulation using common numpy arrays tricks.

../../../_images/plot_numpy_array_1.png

Python ソースコード: plot_numpy_array.py

import numpy as np

import scipy

import scipy.misc

import matplotlib.pyplot as plt



face = scipy.misc.face(gray=True)

face[10:13, 20:23]

face[100:120] = 255



lx, ly = face.shape

X, Y = np.ogrid[0:lx, 0:ly]

mask = (X - lx/2)**2 + (Y - ly/2)**2 > lx*ly/4

face[mask] = 0

face[range(400), range(400)] = 255



plt.figure(figsize=(3, 3))

plt.axes([0, 0, 1, 1])

plt.imshow(face, cmap=plt.cm.gray)

plt.axis('off')



plt.show()

Total running time of the example: 0.27 seconds ( 0 minutes 0.27 seconds)