mirror of
https://github.com/wassname/scikit-image.git
synced 2026-07-05 01:08:41 +08:00
Josh Warner (Mac)
41 lines
1.5 KiB
Python
41 lines
1.5 KiB
Python
import numpy as np
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from numpy.testing import assert_raises
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from skimage.draw import ellipsoid, ellipsoid_stats
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from skimage.measure import marching_cubes, mesh_surface_area
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def test_marching_cubes_isotropic():
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ellipsoid_isotropic = ellipsoid(6, 10, 16, levelset=True)
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_, surf = ellipsoid_stats(6, 10, 16)
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verts, faces = marching_cubes(ellipsoid_isotropic, 0.)
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surf_calc = mesh_surface_area(verts, faces)
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# Test within 1% tolerance for isotropic. Will always underestimate.
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assert surf > surf_calc and surf_calc > surf * 0.99
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def test_marching_cubes_anisotropic():
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spacing = (1., 10 / 6., 16 / 6.)
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ellipsoid_anisotropic = ellipsoid(6, 10, 16, spacing=spacing,
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levelset=True)
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_, surf = ellipsoid_stats(6, 10, 16)
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verts, faces = marching_cubes(ellipsoid_anisotropic, 0.,
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spacing=spacing)
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surf_calc = mesh_surface_area(verts, faces)
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# Test within 1.5% tolerance for anisotropic. Will always underestimate.
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assert surf > surf_calc and surf_calc > surf * 0.985
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def test_invalid_input():
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assert_raises(ValueError, marching_cubes, np.zeros((2, 2, 1)), 0)
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assert_raises(ValueError, marching_cubes, np.zeros((2, 2, 1)), 1)
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assert_raises(ValueError, marching_cubes, np.ones((3, 3, 3)), 1,
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spacing=(1, 2))
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assert_raises(ValueError, marching_cubes, np.zeros((20, 20)), 0)
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if __name__ == '__main__':
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np.testing.run_module_suite()
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