def test_00_01_mask(self):
"""Prewitt on a masked array should be zero"""
np.random.seed(0)
result = F.prewitt(np.random.uniform(size=(10, 10)),
np.zeros((10, 10), bool))
eps = .000001
assert (np.all(np.abs(result) < eps))
def test_00_01_mask(self):
"""Prewitt on a masked array should be zero"""
np.random.seed(0)
result = F.prewitt(np.random.uniform(size=(10, 10)),
np.zeros((10, 10), bool))
eps = .000001
assert (np.all(np.abs(result) < eps))
def test_01_02_vertical(self):
"""Prewitt on a vertical edge should be a vertical line"""
i, j = np.mgrid[-5:6, -5:6]
image = (j >= 0).astype(float)
result = F.prewitt(image)
eps = .000001
j[np.abs(i) == 5] = 10000
assert (np.all(result[j == 0] == 1))
assert (np.all(np.abs(result[np.abs(j) > 1]) < eps))
def test_01_02_vertical(self):
"""Prewitt on a vertical edge should be a vertical line"""
i, j = np.mgrid[-5:6, -5:6]
image = (j >= 0).astype(float)
result = F.prewitt(image)
eps = .000001
j[np.abs(i)==5] = 10000
assert (np.all(result[j == 0] == 1))
assert (np.all(np.abs(result[np.abs(j) > 1]) < eps))
def test_01_01_horizontal(self):
"""Prewitt on an edge should be a horizontal line"""
i, j = np.mgrid[-5:6, -5:6]
image = (i >= 0).astype(float)
result = F.prewitt(image)
# Fudge the eroded points
i[np.abs(j) == 5] = 10000
eps = .000001
assert (np.all(result[i == 0] == 1))
assert (np.all(np.abs(result[np.abs(i) > 1]) < eps))
def test_01_01_horizontal(self):
"""Prewitt on an edge should be a horizontal line"""
i, j = np.mgrid[-5:6, -5:6]
image = (i >= 0).astype(float)
result = F.prewitt(image)
# Fudge the eroded points
i[np.abs(j) == 5] = 10000
eps = .000001
assert (np.all(result[i == 0] == 1))
assert (np.all(np.abs(result[np.abs(i) > 1]) < eps))
def test_00_00_zeros(self):
"""Prewitt on an array of all zeros"""
result = F.prewitt(np.zeros((10, 10)), np.ones((10, 10), bool))
assert (np.all(result == 0))
def test_00_00_zeros(self):
"""Prewitt on an array of all zeros"""
result = F.prewitt(np.zeros((10, 10)), np.ones((10, 10), bool))
assert (np.all(result == 0))
