extract_subsection

Import packages

import matplotlib.pyplot as plt
import numpy as np

import porespy as ps

ps.visualization.set_mpl_style()

Generate image for testing

im = np.random.rand(100, 100)
fig, ax = plt.subplots(figsize=[4, 4])
ax.axis(False)
ax.imshow(im)

<matplotlib.image.AxesImage at 0x7f941b9cd610>

Demonstration

This tool was designed to ‘uppad’ an image that has had an equal amount of padding applied to all sides. The arguments assume that you know the original size of the image and wish to retrieve it back:

im2 = np.pad(im, pad_width=20, constant_values=0)
im = ps.tools.extract_subsection(im=im2, shape=im.shape)
fig, ax = plt.subplots(1, 2, figsize=[8, 4])
ax[0].axis(False)
ax[0].imshow(im2)
ax[1].axis(False)
ax[1].imshow(im);