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Merge pull request #654 from josteinbf/radon-square-center

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Define rotation axis center for Radon transforms with inverses.
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Stefan van der Walt
2013-08-06 02:04:32 -07:00
parent 697d7dddf9 d5b72f91ab
commit be14f0b28c
2 changed files with 69 additions and 52 deletions
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skimage/transform/tests/test_radon_transform.py
+4 -3
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@@ -143,6 +143,7 @@ def test_radon_iradon():
# cubic interpolation is slow; only run one test for it
yield check_radon_iradon, 'cubic', 'shepp-logan'
def test_iradon_angles():
"""
Test with different number of projections
@@ -210,7 +211,7 @@ def _random_circle(shape):
c0, c1 = np.ogrid[0:shape[0], 0:shape[1]]
r = np.sqrt((c0 - shape[0] // 2)**2 + (c1 - shape[1] // 2)**2)
radius = min(shape) // 2
image[r >= radius] = 0.
image[r > radius] = 0.
return image
@@ -236,7 +237,7 @@ def test_radon_circle():
average_mass = mass.mean()
relative_error = np.abs(mass - average_mass) / average_mass
print(relative_error.max(), relative_error.mean())
assert np.all(relative_error < 3e-3)
assert np.all(relative_error < 3.2e-3)
def check_sinogram_circle_to_square(size):
@@ -284,7 +285,7 @@ def check_radon_iradon_circle(interpolation, shape, output_size):
# Find the reconstruction circle, set reconstruction to zero outside
c0, c1 = np.ogrid[0:width, 0:width]
r = np.sqrt((c0 - width // 2)**2 + (c1 - width // 2)**2)
reconstruction_rectangle[r >= radius] = 0.
reconstruction_rectangle[r > radius] = 0.
print(reconstruction_circle.shape)
print(reconstruction_rectangle.shape)
np.allclose(reconstruction_rectangle, reconstruction_circle)