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+# Copyright 2016 The TensorFlow Authors. All Rights Reserved.
+#
+# 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 decode_image."""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import os.path
+import numpy as np
+import tensorflow as tf
+
+# Double-quote usage here is intentional to make internal path rewriting easier.
+prefix_path = os.path.join("tensorflow", "core", "lib")
+
+class DecodeImageOpTest(tf.test.TestCase):
+
+ def testGif(self):
+ # Read some real GIFs
+ path = os.path.join(prefix_path, 'gif', 'testdata', 'scan.gif')
+ WIDTH = 20
+ HEIGHT = 40
+ STRIDE = 5
+ shape = (12, HEIGHT, WIDTH, 3)
+
+ with self.test_session(use_gpu=True) as sess:
+ gif0 = tf.read_file(path)
+ image0 = tf.image.decode_image(gif0)
+ image1 = tf.image.decode_gif(gif0)
+ gif0, image0, image1 = sess.run([gif0, image0, image1])
+
+ self.assertEqual(image0.shape, shape)
+ self.assertAllEqual(image0, image1)
+
+ for frame_idx, frame in enumerate(image0):
+ gt = np.zeros(shape[1:], dtype=np.uint8)
+ start = frame_idx * STRIDE
+ end = (frame_idx + 1) * STRIDE
+ if end <= WIDTH:
+ gt[:, start:end, :] = 255
+ else:
+ start -= WIDTH
+ end -= WIDTH
+ gt[start:end, :, :] = 255
+
+ self.assertAllClose(frame, gt)
+
+ bad_channels = tf.image.decode_image(gif0, channels=1)
+ with self.assertRaises(tf.errors.InvalidArgumentError):
+ bad_channels.eval()
+
+
+ def testJpeg(self):
+ # Read a real jpeg and verify shape
+ path = os.path.join(prefix_path, 'jpeg', 'testdata', 'jpeg_merge_test1.jpg')
+ with self.test_session(use_gpu=True) as sess:
+ jpeg0 = tf.read_file(path)
+ image0 = tf.image.decode_image(jpeg0)
+ image1 = tf.image.decode_jpeg(jpeg0)
+ jpeg0, image0, image1 = sess.run([jpeg0, image0, image1])
+ self.assertEqual(len(jpeg0), 3771)
+ self.assertEqual(image0.shape, (256, 128, 3))
+ self.assertAllEqual(image0, image1)
+
+ def testPng(self):
+ # Read some real PNGs, converting to different channel numbers
+ inputs = [(1, 'lena_gray.png')]
+ for channels_in, filename in inputs:
+ for channels in 0, 1, 3:
+ with self.test_session(use_gpu=True) as sess:
+ path = os.path.join(prefix_path, 'png', 'testdata', filename)
+ png0 = tf.read_file(path)
+ image0 = tf.image.decode_image(png0, channels=channels)
+ image1 = tf.image.decode_png(png0, channels=channels)
+ png0, image0, image1 = sess.run([png0, image0, image1])
+ self.assertEqual(image0.shape, (26, 51, channels or channels_in))
+ self.assertAllEqual(image0, image1)
+
+ def testInvalidBytes(self):
+ image_bytes = b'ThisIsNotAnImage!'
+ decode = tf.image.decode_image(image_bytes)
+ with self.test_session():
+ with self.assertRaises(tf.errors.InvalidArgumentError):
+ decode.eval()
+
+ def testInvalidChannels(self):
+ image_bytes = b'unused'
+ with self.assertRaises(ValueError):
+ decode = tf.image.decode_image(image_bytes, channels=4)
+
+
+if __name__ == "__main__":
+ tf.test.main()