mirror of
https://github.com/wassname/scikit-image.git
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emmanuelle
55f5103dd8
Modified travis_script.sh to account for the new structure of the gallery Added README.txt files in directories of gallery examples Fixed references to gallery images in user guide pages Fixed broken links
30 lines
802 B
Python
30 lines
802 B
Python
"""
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Using simple NumPy operations for manipulating images
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=====================================================
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This script illustrates how to use basic NumPy operations, such as slicing,
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masking and fancy indexing, in order to modify the pixel values of an image.
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"""
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import numpy as np
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from skimage import data
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import matplotlib.pyplot as plt
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camera = data.camera()
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camera[:10] = 0
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mask = camera < 87
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camera[mask] = 255
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inds_x = np.arange(len(camera))
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inds_y = (4 * inds_x) % len(camera)
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camera[inds_x, inds_y] = 0
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l_x, l_y = camera.shape[0], camera.shape[1]
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X, Y = np.ogrid[:l_x, :l_y]
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outer_disk_mask = (X - l_x / 2)**2 + (Y - l_y / 2)**2 > (l_x / 2)**2
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camera[outer_disk_mask] = 0
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plt.figure(figsize=(4, 4))
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plt.imshow(camera, cmap='gray', interpolation='nearest')
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plt.axis('off')
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plt.show()
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