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unwrap: Reduce duplication in tests.

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Jostein Bø Fløystad
2013-11-22 10:45:06 +01:00
parent 43d110627b
commit b0c21ea972
1 changed files with 29 additions and 14 deletions
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skimage/exposure/tests/test_unwrap.py
+29 -14
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@@ -2,19 +2,40 @@ from __future__ import print_function, division
import numpy as np import numpy as np
from numpy.testing import (run_module_suite, assert_array_almost_equal, from numpy.testing import (run_module_suite, assert_array_almost_equal,
assert_almost_equal) assert_almost_equal, assert_array_equal)
import warnings
from skimage.exposure import unwrap from skimage.exposure import unwrap
def assert_phase_almost_equal(a, b, *args, **kwargs):
'''An assert_almost_equal insensitive to phase shifts of n*2*pi.'''
shift = 2 * np.pi * np.round((b.mean() - a.mean()) / (2 * np.pi))
with warnings.catch_warnings():
warnings.simplefilter("ignore")
print('assert_phase_allclose, abs', np.max(np.abs(a - (b - shift))))
print('assert_phase_allclose, rel',
np.max(np.abs((a - (b - shift)) / a)))
if np.ma.isMaskedArray(a):
assert np.ma.isMaskedArray(b)
assert_array_equal(a.mask, b.mask)
au = np.asarray(a)
bu = np.asarray(b)
with warnings.catch_warnings():
warnings.simplefilter("ignore")
print('assert_phase_allclose, no mask, abs',
np.max(np.abs(au - (bu - shift))))
print('assert_phase_allclose, no mask, rel',
np.max(np.abs((au - (bu - shift)) / au)))
assert_array_almost_equal(a + shift, b, *args, **kwargs)
def test_unwrap2D(): def test_unwrap2D():
x, y = np.ogrid[:8, :16] x, y = np.ogrid[:8, :16]
phi = 2*np.pi*(x*0.2 + y*0.1) phi = 2*np.pi*(x*0.2 + y*0.1)
phi_wrapped = np.angle(np.exp(1j*phi)) phi_wrapped = np.angle(np.exp(1j*phi))
phi_unwrapped = unwrap(phi_wrapped) phi_unwrapped = unwrap(phi_wrapped)
assert_phase_almost_equal(phi, phi_unwrapped)
s = np.round(phi_unwrapped[0,0]/(2*np.pi))
assert_array_almost_equal(phi, phi_unwrapped - s*2*np.pi)
def test_unwrap2D_masked(): def test_unwrap2D_masked():
@@ -25,11 +46,9 @@ def test_unwrap2D_masked():
mask[4:6, 4:8] = 1 mask[4:6, 4:8] = 1
phi_wrapped = np.angle(np.exp(1j*phi)) phi_wrapped = np.angle(np.exp(1j*phi))
phi_wrapped_masked = np.ma.array(phi_wrapped, dtype = np.float32, mask = mask) phi_wrapped_masked = np.ma.array(phi_wrapped, dtype=np.float32, mask=mask)
phi_unwrapped_masked = unwrap(phi_wrapped_masked) phi_unwrapped_masked = unwrap(phi_wrapped_masked)
assert_phase_almost_equal(phi, phi_unwrapped_masked)
s = np.round(phi_unwrapped_masked[0,0]/(2*np.pi))
assert_array_almost_equal(phi + 2*np.pi*s, phi_unwrapped_masked)
def test_unwrap3D(): def test_unwrap3D():
@@ -37,9 +56,7 @@ def test_unwrap3D():
phi = 2*np.pi*(x*0.2 + y*0.1 + z*0.05) phi = 2*np.pi*(x*0.2 + y*0.1 + z*0.05)
phi_wrapped = np.angle(np.exp(1j*phi)) phi_wrapped = np.angle(np.exp(1j*phi))
phi_unwrapped = unwrap(phi_wrapped) phi_unwrapped = unwrap(phi_wrapped)
assert_phase_almost_equal(phi, phi_unwrapped)
s = np.round(phi_unwrapped[0,0]/(2*np.pi))
assert_array_almost_equal(phi, phi_unwrapped - s*2*np.pi)
def test_unwrap3D_masked(): def test_unwrap3D_masked():
@@ -50,9 +67,7 @@ def test_unwrap3D_masked():
mask[4:6, 4:6, 1:3] = 1 mask[4:6, 4:6, 1:3] = 1
phi_wrapped_masked = np.ma.array(phi_wrapped, dtype = np.float32, mask = mask) phi_wrapped_masked = np.ma.array(phi_wrapped, dtype = np.float32, mask = mask)
phi_unwrapped_masked = unwrap(phi_wrapped_masked) phi_unwrapped_masked = unwrap(phi_wrapped_masked)
assert_phase_almost_equal(phi, phi_unwrapped_masked)
s = np.round(phi_unwrapped_masked[0,0,0]/(2*np.pi))
assert_array_almost_equal(phi + 2*np.pi*s, phi_unwrapped_masked)
def check_wrap_around(ndim, axis): def check_wrap_around(ndim, axis):