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# coding=utf-8
# Copyright 2021 The Deeplab2 Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Tests for data_utils."""
import io
import numpy as np
from PIL import Image
import tensorflow as tf
from deeplab2.data import data_utils
def _encode_png_image(image):
"""Helper method to encode input image in PNG format."""
buffer = io.BytesIO()
Image.fromarray(image).save(buffer, format='png')
return buffer.getvalue()
class DataUtilsTest(tf.test.TestCase):
def _create_test_image(self, height, width):
rng = np.random.RandomState(319281498)
return rng.randint(0, 255, size=(height, width, 3), dtype=np.uint8)
def test_encode_and_decode(self):
"""Checks decode created tf.Example for semantic segmentation."""
test_image_height = 20
test_image_width = 15
filename = 'dummy'
image = self._create_test_image(test_image_height, test_image_width)
# Take the last channel as dummy label.
label = image[..., 0]
example = data_utils.create_tfexample(
image_data=_encode_png_image(image),
image_format='png', filename=filename,
label_data=_encode_png_image(label), label_format='png')
# Parse created example, expect getting identical results.
parser = data_utils.SegmentationDecoder(is_panoptic_dataset=False)
parsed_tensors = parser(example.SerializeToString())
self.assertIn('image', parsed_tensors)
self.assertIn('image_name', parsed_tensors)
self.assertIn('label', parsed_tensors)
self.assertEqual(filename, parsed_tensors['image_name'])
np.testing.assert_array_equal(image, parsed_tensors['image'].numpy())
# Decoded label is a 3-D array with last dimension of 1.
decoded_label = parsed_tensors['label'].numpy()
np.testing.assert_array_equal(label, decoded_label[..., 0])
def test_encode_and_decode_panoptic(self):
test_image_height = 31
test_image_width = 17
filename = 'dummy'
image = self._create_test_image(test_image_height, test_image_width)
# Create dummy panoptic label in np.int32 dtype.
label = np.dot(image.astype(np.int32), [1, 256, 256 * 256]).astype(np.int32)
example = data_utils.create_tfexample(
image_data=_encode_png_image(image),
image_format='png', filename=filename,
label_data=label.tostring(), label_format='raw')
parser = data_utils.SegmentationDecoder(is_panoptic_dataset=True)
parsed_tensors = parser(example.SerializeToString())
self.assertIn('image', parsed_tensors)
self.assertIn('image_name', parsed_tensors)
self.assertIn('label', parsed_tensors)
self.assertEqual(filename, parsed_tensors['image_name'])
np.testing.assert_array_equal(image, parsed_tensors['image'].numpy())
# Decoded label is a 3-D array with last dimension of 1.
decoded_label = parsed_tensors['label'].numpy()
np.testing.assert_array_equal(label, decoded_label[..., 0])
if __name__ == '__main__':
tf.test.main()
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