def test_yen_binary(self):
image = cp.zeros([2, 256], dtype=cp.uint8)
image[0] = 255
assert threshold_yen(image) < 1
def test_yen_float_image(self):
image = self.image.astype(cp.float64)
assert 2 <= threshold_yen(image) < 3
def test_yen_arange(self):
image = cp.arange(256)
assert threshold_yen(image) == 127
def test_yen(self):
assert threshold_yen(self.image) == 2
def test_yen_negative_int(self):
image = self.image - 2
assert threshold_yen(image) == 0
def test_yen_coins_image():
coins = util.img_as_ubyte(coinsd)
assert 109 < threshold_yen(coins) < 111
def test_yen_coins_image_as_float():
coins = util.img_as_float(coinsd)
assert 0.43 < threshold_yen(coins) < 0.44
def test_yen_camera_image_counts():
camera = util.img_as_ubyte(camerad)
counts, bin_centers = histogram(camera.ravel(), 256, source_range='image')
assert 145 < threshold_yen(hist=counts) < 147
def test_yen_camera_image_histogram():
camera = util.img_as_ubyte(camerad)
hist = histogram(camera.ravel(), 256, source_range="image")
assert 145 < threshold_yen(hist=hist) < 147
def test_yen_camera_image():
camera = util.img_as_ubyte(camerad)
assert 145 < threshold_yen(camera) < 147
def test_yen_blank_max(self):
image = cp.empty((5, 5), dtype=cp.uint8)
image.fill(255)
assert threshold_yen(image) == 255
def test_yen_blank_zero(self):
image = cp.zeros((5, 5), dtype=cp.uint8)
assert threshold_yen(image) == 0