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68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
import numpy as np
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from numpy.testing import *
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from skimage.measure import find_contours
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a = np.ones((8, 8), dtype=np.float32)
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a[1:-1, 1] = 0
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a[1, 1:-1] = 0
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## array([[ 1., 1., 1., 1., 1., 1., 1., 1.],
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## [ 1., 0., 0., 0., 0., 0., 0., 1.],
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## [ 1., 0., 1., 1., 1., 1., 1., 1.],
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## [ 1., 0., 1., 1., 1., 1., 1., 1.],
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## [ 1., 0., 1., 1., 1., 1., 1., 1.],
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## [ 1., 0., 1., 1., 1., 1., 1., 1.],
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## [ 1., 0., 1., 1., 1., 1., 1., 1.],
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## [ 1., 1., 1., 1., 1., 1., 1., 1.]], dtype=float32)
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x, y = np.mgrid[-1:1:5j, -1:1:5j]
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r = np.sqrt(x**2 + y**2)
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def test_binary():
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contours = find_contours(a, 0.5)
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assert len(contours) == 1
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assert_array_equal(contours[0],
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[[6. , 1.5],
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[5. , 1.5],
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[4. , 1.5],
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[3. , 1.5],
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[2. , 1.5],
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[1.5, 2. ],
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[1.5, 3. ],
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[1.5, 4. ],
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[1.5, 5. ],
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[1.5, 6. ],
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[1. , 6.5],
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[0.5, 6. ],
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[0.5, 5. ],
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[0.5, 4. ],
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[0.5, 3. ],
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[0.5, 2. ],
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[0.5, 1. ],
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[1. , 0.5],
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[2. , 0.5],
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[3. , 0.5],
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[4. , 0.5],
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[5. , 0.5],
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[6. , 0.5],
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[6.5, 1. ],
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[6. , 1.5]])
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def test_float():
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contours = find_contours(r, 0.5)
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assert len(contours) == 1
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assert_array_equal(contours[0],
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[[ 2., 3.],
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[ 1., 2.],
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[ 2., 1.],
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[ 3., 2.],
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[ 2., 3.]])
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if __name__ == '__main__':
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from numpy.testing import run_module_suite
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run_module_suite()
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