def test_angle_vs_angle_plus_180(self):
""" Test that the result of reflection() is the same for any angle and angle + 180 """
im = np.random.random((256, 256))
reflected1 = reflection(im, angle=15)
reflected2 = reflection(im, angle=195) # + 180
self.assertTrue(np.allclose(reflected1, reflected2))
def test_no_side_effects(self):
""" Test that reflection() does not modify the input image and mask """
im = np.empty((128, 128), dtype=np.float)
mask = np.zeros_like(im, dtype=np.bool)
im.setflags(write=False)
mask.setflags(write=False)
rot = reflection(im, center=(67, 93), angle=35, mask=mask)
def test_correctness_angle90(self):
""" Test that reflection() correctly symmetrizes around the y-axis. """
im = np.zeros((256, 256), dtype=np.float)
im[:, 0:10] = 1
reflected = reflection(im, angle=90)
expected = np.array(im, copy=True)
expected[:, 0:10] = 0.5
expected[:, 246:256] = 0.5
self.assertTrue(np.allclose(expected, reflected))
def test_output_range(self):
""" Test that reflection() does not modify the value range """
im = 1000 * np.random.random(size=(256, 256))
mask = np.random.choice([True, False], size=im.shape)
with catch_warnings():
simplefilter("ignore")
rot = reflection(im, center=(100, 150), angle=5, mask=mask)
self.assertLessEqual(rot.max(), im.max())
# In the case of a mask that overlaps with itself when rotated,
# the average will be zero due to nan_to_num
self.assertGreaterEqual(rot.min(), min(im.min(), 0))
def test_reflection_correctness_angle0():
""" Test that reflection() correctly symmetrizes around the x-axis. """
im = np.zeros((256, 256), dtype=float)
im[0:10, :] = 1
reflected = reflection(im, angle=0)
expected = np.array(im, copy=True)
expected[0:10, :] = 0.5
expected[246:256, :] = 0.5
assert np.allclose(expected, reflected)
def test_trivial(self):
""" Test the reflection symmetry of an image of zeroes """
im = np.zeros((256, 256))
ref = reflection(im, angle=-15.3)
self.assertTrue(np.allclose(ref, im))
def test_reflection_trivial():
""" Test the reflection symmetry of an image of zeroes """
im = np.zeros((256, 256))
ref = reflection(im, angle=-15.3)
assert np.allclose(ref, im)