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Add padding image transformation (#19838)

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* Add padding transformation

* Add in upstream changes

* Update tests & docs

* Code formatting tuples in docstring
This commit is contained in:
amyeroberts
2022-11-18 11:27:21 +00:00
committed by GitHub
parent c29a2f7c9c
commit b98269425e
3 changed files with 225 additions and 1 deletions
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125
tests/test_image_transforms.py
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@@ -41,6 +41,7 @@ if is_vision_available():
get_resize_output_image_size,
id_to_rgb,
normalize,
pad,
resize,
rgb_to_id,
to_channel_dimension_format,
@@ -289,3 +290,127 @@ class ImageTransformsTester(unittest.TestCase):
]
)
self.assertTrue(np.allclose(id_to_rgb(id_array), color))
def test_pad(self):
# fmt: off
image = np.array([[
[0, 1],
[2, 3],
]])
# fmt: on
# Test that exception is raised if unknown padding mode is specified
with self.assertRaises(ValueError):
pad(image, 10, mode="unknown")
# Test that exception is raised if invalid padding is specified
with self.assertRaises(ValueError):
# Cannot pad on channel dimension
pad(image, (5, 10, 10))
# Test image is padded equally on all sides is padding is an int
# fmt: off
expected_image = np.array([
[[0, 0, 0, 0],
[0, 0, 1, 0],
[0, 2, 3, 0],
[0, 0, 0, 0]],
])
# fmt: on
self.assertTrue(np.allclose(expected_image, pad(image, 1)))
# Test the left and right of each axis is padded (pad_left, pad_right)
# fmt: off
expected_image = np.array(
[[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 1, 0],
[0, 0, 2, 3, 0],
[0, 0, 0, 0, 0]])
# fmt: on
self.assertTrue(np.allclose(expected_image, pad(image, (2, 1))))
# Test only one axis is padded (pad_left, pad_right)
# fmt: off
expected_image = np.array([[
[9, 9],
[9, 9],
[0, 1],
[2, 3],
[9, 9]
]])
# fmt: on
self.assertTrue(np.allclose(expected_image, pad(image, ((2, 1), (0, 0)), constant_values=9)))
# Test padding with a constant value
# fmt: off
expected_image = np.array([[
[8, 8, 0, 1, 9],
[8, 8, 2, 3, 9],
[8, 8, 7, 7, 9],
[8, 8, 7, 7, 9]
]])
# fmt: on
self.assertTrue(np.allclose(expected_image, pad(image, ((0, 2), (2, 1)), constant_values=((6, 7), (8, 9)))))
# fmt: off
image = np.array([[
[0, 1, 2],
[3, 4, 5],
[6, 7, 8],
]])
# fmt: on
# Test padding with PaddingMode.REFLECT
# fmt: off
expected_image = np.array([[
[2, 1, 0, 1, 2, 1],
[5, 4, 3, 4, 5, 4],
[8, 7, 6, 7, 8, 7],
[5, 4, 3, 4, 5, 4],
[2, 1, 0, 1, 2, 1],
]])
# fmt: on
self.assertTrue(np.allclose(expected_image, pad(image, ((0, 2), (2, 1)), mode="reflect")))
# Test padding with PaddingMode.REPLICATE
# fmt: off
expected_image = np.array([[
[0, 0, 0, 1, 2, 2],
[3, 3, 3, 4, 5, 5],
[6, 6, 6, 7, 8, 8],
[6, 6, 6, 7, 8, 8],
[6, 6, 6, 7, 8, 8],
]])
# fmt: on
self.assertTrue(np.allclose(expected_image, pad(image, ((0, 2), (2, 1)), mode="replicate")))
# Test padding with PaddingMode.SYMMETRIC
# fmt: off
expected_image = np.array([[
[1, 0, 0, 1, 2, 2],
[4, 3, 3, 4, 5, 5],
[7, 6, 6, 7, 8, 8],
[7, 6, 6, 7, 8, 8],
[4, 3, 3, 4, 5, 5],
]])
# fmt: on
self.assertTrue(np.allclose(expected_image, pad(image, ((0, 2), (2, 1)), mode="symmetric")))
# Test we can specify the output data format
# Test padding with PaddingMode.REFLECT
# fmt: off
image = np.array([[
[0, 1],
[2, 3],
]])
expected_image = np.array([
[[0], [1], [0], [1], [0]],
[[2], [3], [2], [3], [2]],
[[0], [1], [0], [1], [0]],
[[2], [3], [2], [3], [2]]
])
# fmt: on
self.assertTrue(
np.allclose(expected_image, pad(image, ((0, 2), (2, 1)), mode="reflect", data_format="channels_last"))
)