def test_with_movement(self):
transform = RandomMotion(num_transforms=1)
transformed = transform(self.sample_subject)
self.assertTensorNotEqual(
self.sample_subject.t1.data,
transformed.t1.data,
)
def test_no_movement(self):
transform = RandomMotion(degrees=0, translation=0, num_transforms=1)
transformed = transform(self.sample_subject)
self.assertTensorAlmostEqual(
self.sample_subject.t1.data,
transformed.t1.data,
)
def simulate_artefacts(sample, artefacts=(0, 0, 0, 0)):
transforms = []
if artefacts[0] == 1:
if random.random() < 0.5:
degrees = (5, random.random() * 10 + 5)
else:
degrees = (-(random.random() * 10 + 5), -5)
if random.random() < 0.5:
translation = (5, random.random() * 10 + 5)
else:
translation = (-(random.random() * 10 + 5), -5)
transforms.append(
RandomMotion(degrees=degrees,
translation=translation,
num_transforms=random.randint(2, 15)))
elif artefacts[1] == 1:
transforms.append(
RandomGhosting(num_ghosts=(2, 10), intensity=(0.5, 0.75)))
elif artefacts[2] == 1:
transforms.append(RandomBlur(std=(0.5, 2.)))
elif artefacts[3] == 1:
transforms.append(RandomNoise(std=(0.01, 0.05)))
transforms = Compose(transforms)
return transforms(sample)
def test_bad_num_transforms_value(self):
with self.assertRaises(ValueError):
RandomMotion(num_transforms=0)
def test_wrong_image_interpolation_value(self):
with self.assertRaises(AttributeError):
RandomMotion(image_interpolation='wrong')
def test_wrong_image_interpolation_type(self):
with self.assertRaises(TypeError):
RandomMotion(image_interpolation=0)
def test_wrong_translation_type(self):
with self.assertRaises(ValueError):
RandomMotion(translation='wrong')
def test_negative_translation(self):
with self.assertRaises(ValueError):
RandomMotion(translation=-10)
def test_wrong_degrees_type(self):
with self.assertRaises(ValueError):
RandomMotion(degrees='wrong')
def test_negative_degrees(self):
with self.assertRaises(ValueError):
RandomMotion(degrees=-10)
def test_with_movement(self):
transform = RandomMotion(num_transforms=1)
transformed = transform(self.sample)
with self.assertRaises(AssertionError):
assert_array_equal(self.sample.t1.data, transformed.t1.data)
def test_no_movement(self):
transform = RandomMotion(degrees=0, translation=0, num_transforms=1)
transformed = transform(self.sample)
assert_array_equal(self.sample.t1.data, transformed.t1.data)
