def test_mean():
img = np.zeros((2, 6))
img[:, 2:4] = 1
img[:, 4:] = 2
assert(threshold_mean(img) == 1.)
def test_mean():
img = np.zeros((2, 6))
img[:, 2:4] = 1
img[:, 4:] = 2
assert (threshold_mean(img) == 1.)
