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1914 lines (1604 loc) · 71.8 KB
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# Copyright 2015 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 tensorflow.ops.image_ops."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import math
import os
import numpy as np
from six.moves import xrange # pylint: disable=redefined-builtin
from tensorflow.python.framework import constant_op
from tensorflow.python.framework import dtypes
from tensorflow.python.framework import errors
from tensorflow.python.framework import ops
from tensorflow.python.framework import test_util
from tensorflow.python.ops import array_ops
from tensorflow.python.ops import image_ops
from tensorflow.python.ops import io_ops
from tensorflow.python.ops import math_ops
from tensorflow.python.platform import googletest
from tensorflow.python.platform import test
class RGBToHSVTest(test_util.TensorFlowTestCase):
def testBatch(self):
# Build an arbitrary RGB image
np.random.seed(7)
batch_size = 5
shape = (batch_size, 2, 7, 3)
for nptype in [np.float32, np.float64]:
inp = np.random.rand(*shape).astype(nptype)
# Convert to HSV and back, as a batch and individually
with self.test_session(use_gpu=True) as sess:
batch0 = constant_op.constant(inp)
batch1 = image_ops.rgb_to_hsv(batch0)
batch2 = image_ops.hsv_to_rgb(batch1)
split0 = array_ops.unpack(batch0)
split1 = list(map(image_ops.rgb_to_hsv, split0))
split2 = list(map(image_ops.hsv_to_rgb, split1))
join1 = array_ops.pack(split1)
join2 = array_ops.pack(split2)
batch1, batch2, join1, join2 = sess.run([batch1, batch2, join1, join2])
# Verify that processing batch elements together is the same as separate
self.assertAllClose(batch1, join1)
self.assertAllClose(batch2, join2)
self.assertAllClose(batch2, inp)
def testRGBToHSVRoundTrip(self):
data = [0, 5, 13, 54, 135, 226, 37, 8, 234, 90, 255, 1]
for nptype in [np.float32, np.float64]:
rgb_np = np.array(data, dtype=nptype).reshape([2, 2, 3]) / 255.
with self.test_session(use_gpu=True):
hsv = image_ops.rgb_to_hsv(rgb_np)
rgb = image_ops.hsv_to_rgb(hsv)
rgb_tf = rgb.eval()
self.assertAllClose(rgb_tf, rgb_np)
class GrayscaleToRGBTest(test_util.TensorFlowTestCase):
def _RGBToGrayscale(self, images):
is_batch = True
if len(images.shape) == 3:
is_batch = False
images = np.expand_dims(images, axis=0)
out_shape = images.shape[0:3] + (1,)
out = np.zeros(shape=out_shape, dtype=np.uint8)
for batch in xrange(images.shape[0]):
for y in xrange(images.shape[1]):
for x in xrange(images.shape[2]):
red = images[batch, y, x, 0]
green = images[batch, y, x, 1]
blue = images[batch, y, x, 2]
gray = 0.2989 * red + 0.5870 * green + 0.1140 * blue
out[batch, y, x, 0] = int(gray)
if not is_batch:
out = np.squeeze(out, axis=0)
return out
def _TestRGBToGrayscale(self, x_np):
y_np = self._RGBToGrayscale(x_np)
with self.test_session(use_gpu=True):
x_tf = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.rgb_to_grayscale(x_tf)
y_tf = y.eval()
self.assertAllEqual(y_tf, y_np)
def testBasicRGBToGrayscale(self):
# 4-D input with batch dimension.
x_np = np.array([[1, 2, 3], [4, 10, 1]],
dtype=np.uint8).reshape([1, 1, 2, 3])
self._TestRGBToGrayscale(x_np)
# 3-D input with no batch dimension.
x_np = np.array([[1, 2, 3], [4, 10, 1]], dtype=np.uint8).reshape([1, 2, 3])
self._TestRGBToGrayscale(x_np)
def testBasicGrayscaleToRGB(self):
# 4-D input with batch dimension.
x_np = np.array([[1, 2]], dtype=np.uint8).reshape([1, 1, 2, 1])
y_np = np.array([[1, 1, 1], [2, 2, 2]],
dtype=np.uint8).reshape([1, 1, 2, 3])
with self.test_session(use_gpu=True):
x_tf = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.grayscale_to_rgb(x_tf)
y_tf = y.eval()
self.assertAllEqual(y_tf, y_np)
# 3-D input with no batch dimension.
x_np = np.array([[1, 2]], dtype=np.uint8).reshape([1, 2, 1])
y_np = np.array([[1, 1, 1], [2, 2, 2]], dtype=np.uint8).reshape([1, 2, 3])
with self.test_session(use_gpu=True):
x_tf = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.grayscale_to_rgb(x_tf)
y_tf = y.eval()
self.assertAllEqual(y_tf, y_np)
def testShapeInference(self):
# Shape inference works and produces expected output where possible
rgb_shape = [7, None, 19, 3]
gray_shape = rgb_shape[:-1] + [1]
with self.test_session(use_gpu=True):
rgb_tf = array_ops.placeholder(dtypes.uint8, shape=rgb_shape)
gray = image_ops.rgb_to_grayscale(rgb_tf)
self.assertEqual(gray_shape, gray.get_shape().as_list())
with self.test_session(use_gpu=True):
gray_tf = array_ops.placeholder(dtypes.uint8, shape=gray_shape)
rgb = image_ops.grayscale_to_rgb(gray_tf)
self.assertEqual(rgb_shape, rgb.get_shape().as_list())
# Shape inference does not break for unknown shapes
with self.test_session(use_gpu=True):
rgb_tf_unknown = array_ops.placeholder(dtypes.uint8)
gray_unknown = image_ops.rgb_to_grayscale(rgb_tf_unknown)
self.assertFalse(gray_unknown.get_shape())
with self.test_session(use_gpu=True):
gray_tf_unknown = array_ops.placeholder(dtypes.uint8)
rgb_unknown = image_ops.grayscale_to_rgb(gray_tf_unknown)
self.assertFalse(rgb_unknown.get_shape())
class AdjustHueTest(test_util.TensorFlowTestCase):
def testAdjustNegativeHue(self):
x_shape = [2, 2, 3]
x_data = [0, 5, 13, 54, 135, 226, 37, 8, 234, 90, 255, 1]
x_np = np.array(x_data, dtype=np.uint8).reshape(x_shape)
delta = -0.25
y_data = [0, 13, 1, 54, 226, 59, 8, 234, 150, 255, 39, 1]
y_np = np.array(y_data, dtype=np.uint8).reshape(x_shape)
with self.test_session(use_gpu=True):
x = constant_op.constant(x_np, shape=x_shape)
y = image_ops.adjust_hue(x, delta)
y_tf = y.eval()
self.assertAllEqual(y_tf, y_np)
def testAdjustPositiveHue(self):
x_shape = [2, 2, 3]
x_data = [0, 5, 13, 54, 135, 226, 37, 8, 234, 90, 255, 1]
x_np = np.array(x_data, dtype=np.uint8).reshape(x_shape)
delta = 0.25
y_data = [13, 0, 11, 226, 54, 221, 234, 8, 92, 1, 217, 255]
y_np = np.array(y_data, dtype=np.uint8).reshape(x_shape)
with self.test_session(use_gpu=True):
x = constant_op.constant(x_np, shape=x_shape)
y = image_ops.adjust_hue(x, delta)
y_tf = y.eval()
self.assertAllEqual(y_tf, y_np)
class AdjustSaturationTest(test_util.TensorFlowTestCase):
def testHalfSaturation(self):
x_shape = [2, 2, 3]
x_data = [0, 5, 13, 54, 135, 226, 37, 8, 234, 90, 255, 1]
x_np = np.array(x_data, dtype=np.uint8).reshape(x_shape)
saturation_factor = 0.5
y_data = [6, 9, 13, 140, 180, 226, 135, 121, 234, 172, 255, 128]
y_np = np.array(y_data, dtype=np.uint8).reshape(x_shape)
with self.test_session(use_gpu=True):
x = constant_op.constant(x_np, shape=x_shape)
y = image_ops.adjust_saturation(x, saturation_factor)
y_tf = y.eval()
self.assertAllEqual(y_tf, y_np)
def testTwiceSaturation(self):
x_shape = [2, 2, 3]
x_data = [0, 5, 13, 54, 135, 226, 37, 8, 234, 90, 255, 1]
x_np = np.array(x_data, dtype=np.uint8).reshape(x_shape)
saturation_factor = 2.0
y_data = [0, 5, 13, 0, 106, 226, 30, 0, 234, 89, 255, 0]
y_np = np.array(y_data, dtype=np.uint8).reshape(x_shape)
with self.test_session(use_gpu=True):
x = constant_op.constant(x_np, shape=x_shape)
y = image_ops.adjust_saturation(x, saturation_factor)
y_tf = y.eval()
self.assertAllEqual(y_tf, y_np)
class FlipTransposeRotateTest(test_util.TensorFlowTestCase):
def testIdempotentLeftRight(self):
x_np = np.array([[1, 2, 3], [1, 2, 3]], dtype=np.uint8).reshape([2, 3, 1])
with self.test_session(use_gpu=True):
x_tf = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.flip_left_right(image_ops.flip_left_right(x_tf))
y_tf = y.eval()
self.assertAllEqual(y_tf, x_np)
def testLeftRight(self):
x_np = np.array([[1, 2, 3], [1, 2, 3]], dtype=np.uint8).reshape([2, 3, 1])
y_np = np.array([[3, 2, 1], [3, 2, 1]], dtype=np.uint8).reshape([2, 3, 1])
with self.test_session(use_gpu=True):
x_tf = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.flip_left_right(x_tf)
y_tf = y.eval()
self.assertAllEqual(y_tf, y_np)
def testIdempotentUpDown(self):
x_np = np.array([[1, 2, 3], [4, 5, 6]], dtype=np.uint8).reshape([2, 3, 1])
with self.test_session(use_gpu=True):
x_tf = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.flip_up_down(image_ops.flip_up_down(x_tf))
y_tf = y.eval()
self.assertAllEqual(y_tf, x_np)
def testUpDown(self):
x_np = np.array([[1, 2, 3], [4, 5, 6]], dtype=np.uint8).reshape([2, 3, 1])
y_np = np.array([[4, 5, 6], [1, 2, 3]], dtype=np.uint8).reshape([2, 3, 1])
with self.test_session(use_gpu=True):
x_tf = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.flip_up_down(x_tf)
y_tf = y.eval()
self.assertAllEqual(y_tf, y_np)
def testIdempotentTranspose(self):
x_np = np.array([[1, 2, 3], [4, 5, 6]], dtype=np.uint8).reshape([2, 3, 1])
with self.test_session(use_gpu=True):
x_tf = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.transpose_image(image_ops.transpose_image(x_tf))
y_tf = y.eval()
self.assertAllEqual(y_tf, x_np)
def testTranspose(self):
x_np = np.array([[1, 2, 3], [4, 5, 6]], dtype=np.uint8).reshape([2, 3, 1])
y_np = np.array([[1, 4], [2, 5], [3, 6]], dtype=np.uint8).reshape([3, 2, 1])
with self.test_session(use_gpu=True):
x_tf = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.transpose_image(x_tf)
y_tf = y.eval()
self.assertAllEqual(y_tf, y_np)
def testPartialShapes(self):
p_unknown_rank = array_ops.placeholder(dtypes.uint8)
p_unknown_dims = array_ops.placeholder(dtypes.uint8,
shape=[None, None, None])
p_unknown_width = array_ops.placeholder(dtypes.uint8, shape=[64, None, 3])
p_wrong_rank = array_ops.placeholder(dtypes.uint8, shape=[None, None])
p_zero_dim = array_ops.placeholder(dtypes.uint8, shape=[64, 0, 3])
for op in [image_ops.flip_left_right,
image_ops.flip_up_down,
image_ops.random_flip_left_right,
image_ops.random_flip_up_down,
image_ops.transpose_image,
image_ops.rot90]:
transformed_unknown_rank = op(p_unknown_rank)
self.assertEqual(3, transformed_unknown_rank.get_shape().ndims)
transformed_unknown_dims = op(p_unknown_dims)
self.assertEqual(3, transformed_unknown_dims.get_shape().ndims)
transformed_unknown_width = op(p_unknown_width)
self.assertEqual(3, transformed_unknown_width.get_shape().ndims)
with self.assertRaisesRegexp(ValueError, 'must be three-dimensional'):
op(p_wrong_rank)
with self.assertRaisesRegexp(ValueError, 'must be > 0'):
op(p_zero_dim)
def testRot90GroupOrder(self):
image = np.arange(24, dtype=np.uint8).reshape([2, 4, 3])
with self.test_session(use_gpu=True):
rotated = image
for _ in xrange(4):
rotated = image_ops.rot90(rotated)
self.assertAllEqual(image, rotated.eval())
def testRot90NumpyEquivalence(self):
image = np.arange(24, dtype=np.uint8).reshape([2, 4, 3])
with self.test_session(use_gpu=True):
k_placeholder = array_ops.placeholder(dtypes.int32, shape=[])
y_tf = image_ops.rot90(image, k_placeholder)
for k in xrange(4):
y_np = np.rot90(image, k=k)
self.assertAllEqual(y_np, y_tf.eval({k_placeholder: k}))
class RandomFlipTest(test_util.TensorFlowTestCase):
def testRandomLeftRight(self):
x_np = np.array([0, 1], dtype=np.uint8).reshape([1, 2, 1])
num_iterations = 500
hist = [0, 0]
with self.test_session(use_gpu=True):
x_tf = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.random_flip_left_right(x_tf)
for _ in xrange(num_iterations):
y_np = y.eval().flatten()[0]
hist[y_np] += 1
# Ensure that each entry is observed within 4 standard deviations.
four_stddev = 4.0 * np.sqrt(num_iterations / 2.0)
self.assertAllClose(hist, [num_iterations / 2.0] * 2, atol=four_stddev)
def testRandomUpDown(self):
x_np = np.array([0, 1], dtype=np.uint8).reshape([2, 1, 1])
num_iterations = 500
hist = [0, 0]
with self.test_session(use_gpu=True):
x_tf = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.random_flip_up_down(x_tf)
for _ in xrange(num_iterations):
y_np = y.eval().flatten()[0]
hist[y_np] += 1
# Ensure that each entry is observed within 4 standard deviations.
four_stddev = 4.0 * np.sqrt(num_iterations / 2.0)
self.assertAllClose(hist, [num_iterations / 2.0] * 2, atol=four_stddev)
class AdjustContrastTest(test_util.TensorFlowTestCase):
def _testContrast(self, x_np, y_np, contrast_factor):
with self.test_session(use_gpu=True):
x = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.adjust_contrast(x, contrast_factor)
y_tf = y.eval()
self.assertAllClose(y_tf, y_np, 1e-6)
def testDoubleContrastUint8(self):
x_shape = [1, 2, 2, 3]
x_data = [0, 5, 13, 54, 135, 226, 37, 8, 234, 90, 255, 1]
x_np = np.array(x_data, dtype=np.uint8).reshape(x_shape)
y_data = [0, 0, 0, 62, 169, 255, 28, 0, 255, 135, 255, 0]
y_np = np.array(y_data, dtype=np.uint8).reshape(x_shape)
self._testContrast(x_np, y_np, contrast_factor=2.0)
def testDoubleContrastFloat(self):
x_shape = [1, 2, 2, 3]
x_data = [0, 5, 13, 54, 135, 226, 37, 8, 234, 90, 255, 1]
x_np = np.array(x_data, dtype=np.float).reshape(x_shape) / 255.
y_data = [-45.25, -90.75, -92.5, 62.75, 169.25, 333.5, 28.75, -84.75, 349.5,
134.75, 409.25, -116.5]
y_np = np.array(y_data, dtype=np.float).reshape(x_shape) / 255.
self._testContrast(x_np, y_np, contrast_factor=2.0)
def testHalfContrastUint8(self):
x_shape = [1, 2, 2, 3]
x_data = [0, 5, 13, 54, 135, 226, 37, 8, 234, 90, 255, 1]
x_np = np.array(x_data, dtype=np.uint8).reshape(x_shape)
y_data = [22, 52, 65, 49, 118, 172, 41, 54, 176, 67, 178, 59]
y_np = np.array(y_data, dtype=np.uint8).reshape(x_shape)
self._testContrast(x_np, y_np, contrast_factor=0.5)
def testBatchDoubleContrast(self):
x_shape = [2, 1, 2, 3]
x_data = [0, 5, 13, 54, 135, 226, 37, 8, 234, 90, 255, 1]
x_np = np.array(x_data, dtype=np.uint8).reshape(x_shape)
y_data = [0, 0, 0, 81, 200, 255, 10, 0, 255, 116, 255, 0]
y_np = np.array(y_data, dtype=np.uint8).reshape(x_shape)
self._testContrast(x_np, y_np, contrast_factor=2.0)
class AdjustBrightnessTest(test_util.TensorFlowTestCase):
def _testBrightness(self, x_np, y_np, delta):
with self.test_session(use_gpu=True):
x = constant_op.constant(x_np, shape=x_np.shape)
y = image_ops.adjust_brightness(x, delta)
y_tf = y.eval()
self.assertAllClose(y_tf, y_np, 1e-6)
def testPositiveDeltaUint8(self):
x_shape = [2, 2, 3]
x_data = [0, 5, 13, 54, 135, 226, 37, 8, 234, 90, 255, 1]
x_np = np.array(x_data, dtype=np.uint8).reshape(x_shape)
y_data = [10, 15, 23, 64, 145, 236, 47, 18, 244, 100, 255, 11]
y_np = np.array(y_data, dtype=np.uint8).reshape(x_shape)
self._testBrightness(x_np, y_np, delta=10. / 255.)
def testPositiveDeltaFloat(self):
x_shape = [2, 2, 3]
x_data = [0, 5, 13, 54, 135, 226, 37, 8, 234, 90, 255, 1]
x_np = np.array(x_data, dtype=np.float32).reshape(x_shape) / 255.
y_data = [10, 15, 23, 64, 145, 236, 47, 18, 244, 100, 265, 11]
y_np = np.array(y_data, dtype=np.float32).reshape(x_shape) / 255.
self._testBrightness(x_np, y_np, delta=10. / 255.)
def testNegativeDelta(self):
x_shape = [2, 2, 3]
x_data = [0, 5, 13, 54, 135, 226, 37, 8, 234, 90, 255, 1]
x_np = np.array(x_data, dtype=np.uint8).reshape(x_shape)
y_data = [0, 0, 3, 44, 125, 216, 27, 0, 224, 80, 245, 0]
y_np = np.array(y_data, dtype=np.uint8).reshape(x_shape)
self._testBrightness(x_np, y_np, delta=-10. / 255.)
class PerImageWhiteningTest(test_util.TensorFlowTestCase):
def _NumpyPerImageWhitening(self, x):
num_pixels = np.prod(x.shape)
x2 = np.square(x).astype(np.float32)
mn = np.mean(x)
vr = np.mean(x2) - (mn * mn)
stddev = max(math.sqrt(vr), 1.0 / math.sqrt(num_pixels))
y = x.astype(np.float32)
y -= mn
y /= stddev
return y
def testBasic(self):
x_shape = [13, 9, 3]
x_np = np.arange(0, np.prod(x_shape), dtype=np.int32).reshape(x_shape)
y_np = self._NumpyPerImageWhitening(x_np)
with self.test_session(use_gpu=True):
x = constant_op.constant(x_np, shape=x_shape)
y = image_ops.per_image_whitening(x)
y_tf = y.eval()
self.assertAllClose(y_tf, y_np, atol=1e-4)
def testUniformImage(self):
im_np = np.ones([19, 19, 3]).astype(np.float32) * 249
im = constant_op.constant(im_np)
whiten = image_ops.per_image_whitening(im)
with self.test_session(use_gpu=True):
whiten_np = whiten.eval()
self.assertFalse(np.any(np.isnan(whiten_np)))
class CropToBoundingBoxTest(test_util.TensorFlowTestCase):
def _CropToBoundingBox(self, x, offset_height, offset_width,
target_height, target_width, use_tensor_inputs):
if use_tensor_inputs:
offset_height = ops.convert_to_tensor(offset_height)
offset_width = ops.convert_to_tensor(offset_width)
target_height = ops.convert_to_tensor(target_height)
target_width = ops.convert_to_tensor(target_width)
x_tensor = array_ops.placeholder(x.dtype, shape=[None]*x.ndim)
feed_dict = {x_tensor: x}
else:
x_tensor = x
feed_dict = {}
y = image_ops.crop_to_bounding_box(x_tensor, offset_height, offset_width,
target_height, target_width)
if not use_tensor_inputs:
self.assertTrue(y.get_shape().is_fully_defined())
with self.test_session(use_gpu=True):
return y.eval(feed_dict=feed_dict)
def _assertReturns(self, x, x_shape, offset_height, offset_width,
y, y_shape, use_tensor_inputs_options=None):
use_tensor_inputs_options = use_tensor_inputs_options or [False, True]
target_height, target_width, _ = y_shape
x = np.array(x).reshape(x_shape)
y = np.array(y).reshape(y_shape)
for use_tensor_inputs in use_tensor_inputs_options:
y_tf = self._CropToBoundingBox(x, offset_height, offset_width,
target_height, target_width,
use_tensor_inputs)
self.assertAllClose(y, y_tf)
def _assertRaises(self, x, x_shape, offset_height, offset_width,
target_height, target_width, err_msg,
use_tensor_inputs_options=None):
use_tensor_inputs_options = use_tensor_inputs_options or [False, True]
x = np.array(x).reshape(x_shape)
for use_tensor_inputs in use_tensor_inputs_options:
try:
self._CropToBoundingBox(x, offset_height, offset_width,
target_height, target_width,
use_tensor_inputs)
except Exception as e:
if err_msg not in str(e):
raise
else:
raise AssertionError('Exception not raised: %s' % err_msg)
def _assertShapeInference(self, pre_shape, height, width, post_shape):
image = array_ops.placeholder(dtypes.float32, shape=pre_shape)
y = image_ops.crop_to_bounding_box(image, 0, 0, height, width)
self.assertEqual(y.get_shape().as_list(), post_shape)
def testNoOp(self):
x_shape = [10, 10, 10]
x = np.random.uniform(size=x_shape)
self._assertReturns(x, x_shape, 0, 0, x, x_shape)
def testCrop(self):
x = [1, 2, 3,
4, 5, 6,
7, 8, 9]
x_shape = [3, 3, 1]
offset_height, offset_width = [1, 0]
y_shape = [2, 3, 1]
y = [4, 5, 6,
7, 8, 9]
self._assertReturns(x, x_shape, offset_height, offset_width, y, y_shape)
offset_height, offset_width = [0, 1]
y_shape = [3, 2, 1]
y = [2, 3,
5, 6,
8, 9]
self._assertReturns(x, x_shape, offset_height, offset_width, y, y_shape)
offset_height, offset_width = [0, 0]
y_shape = [2, 3, 1]
y = [1, 2, 3,
4, 5, 6]
self._assertReturns(x, x_shape, offset_height, offset_width, y, y_shape)
offset_height, offset_width = [0, 0]
y_shape = [3, 2, 1]
y = [1, 2,
4, 5,
7, 8]
self._assertReturns(x, x_shape, offset_height, offset_width, y, y_shape)
def testShapeInference(self):
self._assertShapeInference([55, 66, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([59, 69, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([None, 66, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([None, 69, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([55, None, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([59, None, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([None, None, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([55, 66, None], 55, 66, [55, 66, None])
self._assertShapeInference([59, 69, None], 55, 66, [55, 66, None])
self._assertShapeInference([None, None, None], 55, 66, [55, 66, None])
self._assertShapeInference(None, 55, 66, [55, 66, None])
def testNon3DInput(self):
# Input image is not 3D
x = [0] * 15
offset_height, offset_width = [0, 0]
target_height, target_width = [2, 2]
for x_shape in ([1, 3, 5, 1], [3, 5]):
self._assertRaises(x, x_shape, offset_height, offset_width,
target_height, target_width,
"'image' must be three-dimensional")
def testZeroLengthInput(self):
# Input image has 0-length dimension(s).
# Each line is a test configuration:
# x_shape, target_height, target_width
test_config = (([0, 2, 2], 1, 1),
([2, 0, 2], 1, 1),
([2, 2, 0], 1, 1),
([0, 2, 2], 0, 1),
([2, 0, 2], 1, 0))
offset_height, offset_width = [0, 0]
x = []
for x_shape, target_height, target_width in test_config:
self._assertRaises(x, x_shape, offset_height, offset_width,
target_height, target_width,
"all dims of 'image.shape' must be > 0",
use_tensor_inputs_options=[False])
# Multiple assertion could fail, but the evaluation order is arbitrary.
# Match gainst generic pattern.
self._assertRaises(x, x_shape, offset_height, offset_width,
target_height, target_width,
"assertion failed:",
use_tensor_inputs_options=[True])
def testBadParams(self):
x_shape = [4, 4, 1]
x = np.zeros(x_shape)
# Each line is a test configuration:
# (offset_height, offset_width, target_height, target_width), err_msg
test_config = (([-1, 0, 3, 3], 'offset_height must be >= 0'),
([0, -1, 3, 3], 'offset_width must be >= 0'),
([0, 0, 0, 3], 'target_height must be > 0'),
([0, 0, 3, 0], 'target_width must be > 0'),
([2, 0, 3, 3], 'height must be >= target + offset'),
([0, 2, 3, 3], 'width must be >= target + offset'))
for params, err_msg in test_config:
self._assertRaises(x, x_shape, *params, err_msg=err_msg)
class CentralCropTest(test_util.TensorFlowTestCase):
def _assertShapeInference(self, pre_shape, fraction, post_shape):
image = array_ops.placeholder(dtypes.float32, shape=pre_shape)
y = image_ops.central_crop(image, fraction)
if post_shape is None:
self.assertEqual(y.get_shape().dims, None)
else:
self.assertEqual(y.get_shape().as_list(), post_shape)
def testNoOp(self):
x_shape = [13, 9, 3]
x_np = np.ones(x_shape, dtype=np.float32)
with self.test_session(use_gpu=True):
x = constant_op.constant(x_np, shape=x_shape)
y = image_ops.central_crop(x, 1.0)
y_tf = y.eval()
self.assertAllEqual(y_tf, x_np)
self.assertEqual(y.op.name, x.op.name)
def testCropping(self):
x_shape = [4, 8, 1]
x_np = np.array([[1, 2, 3, 4, 5, 6, 7, 8], [1, 2, 3, 4, 5, 6, 7, 8],
[1, 2, 3, 4, 5, 6, 7, 8], [1, 2, 3, 4, 5, 6, 7, 8]],
dtype=np.int32).reshape(x_shape)
y_np = np.array([[3, 4, 5, 6], [3, 4, 5, 6]]).reshape([2, 4, 1])
with self.test_session(use_gpu=True):
x = constant_op.constant(x_np, shape=x_shape)
y = image_ops.central_crop(x, 0.5)
y_tf = y.eval()
self.assertAllEqual(y_tf, y_np)
def testShapeInference(self):
# Test no-op fraction=1.0
self._assertShapeInference([50, 60, 3], 1.0, [50, 60, 3])
self._assertShapeInference([None, 60, 3], 1.0, [None, 60, 3])
self._assertShapeInference([50, None, 3], 1.0, [50, None, 3])
self._assertShapeInference([None, None, 3], 1.0, [None, None, 3])
self._assertShapeInference([50, 60, None], 1.0, [50, 60, None])
self._assertShapeInference([None, None, None], 1.0, [None, None, None])
self._assertShapeInference(None, 1.0, None)
# TODO(toddw): Currently central_crop() doesn't infer the result shape even
# when it's possible. If we change it to do so, we can test as follows:
#
# self._assertShapeInference([50, 60, 3], 0.5, [25, 30, 3])
# self._assertShapeInference([None, 60, 3], 0.5, [None, 30, 3])
# self._assertShapeInference([50, None, 3], 0.5, [25, None, 3])
# self._assertShapeInference([None, None, 3], 0.5, [None, None, 3])
# self._assertShapeInference([50, 60, None], 0.5, [25, 30, None])
# self._assertShapeInference([None, None, None], 0.5, [None, None, None])
# self._assertShapeInference(None, 0.5, None)
def testError(self):
x_shape = [13, 9, 3]
x_np = np.ones(x_shape, dtype=np.float32)
with self.test_session(use_gpu=True):
x = constant_op.constant(x_np, shape=x_shape)
with self.assertRaises(ValueError):
_ = image_ops.central_crop(x, 0.0)
with self.assertRaises(ValueError):
_ = image_ops.central_crop(x, 1.01)
class PadToBoundingBoxTest(test_util.TensorFlowTestCase):
def _PadToBoundingBox(self, x, offset_height, offset_width,
target_height, target_width, use_tensor_inputs):
if use_tensor_inputs:
offset_height = ops.convert_to_tensor(offset_height)
offset_width = ops.convert_to_tensor(offset_width)
target_height = ops.convert_to_tensor(target_height)
target_width = ops.convert_to_tensor(target_width)
x_tensor = array_ops.placeholder(x.dtype, shape=[None]*x.ndim)
feed_dict = {x_tensor: x}
else:
x_tensor = x
feed_dict = {}
y = image_ops.pad_to_bounding_box(x_tensor, offset_height, offset_width,
target_height, target_width)
if not use_tensor_inputs:
self.assertTrue(y.get_shape().is_fully_defined())
with self.test_session(use_gpu=True):
return y.eval(feed_dict=feed_dict)
def _assertReturns(self, x, x_shape, offset_height, offset_width,
y, y_shape, use_tensor_inputs_options=None):
use_tensor_inputs_options = use_tensor_inputs_options or [False, True]
target_height, target_width, _ = y_shape
x = np.array(x).reshape(x_shape)
y = np.array(y).reshape(y_shape)
for use_tensor_inputs in use_tensor_inputs_options:
y_tf = self._PadToBoundingBox(x, offset_height, offset_width,
target_height, target_width,
use_tensor_inputs)
self.assertAllClose(y, y_tf)
def _assertRaises(self, x, x_shape, offset_height, offset_width,
target_height, target_width, err_msg,
use_tensor_inputs_options=None):
use_tensor_inputs_options = use_tensor_inputs_options or [False, True]
x = np.array(x).reshape(x_shape)
for use_tensor_inputs in use_tensor_inputs_options:
try:
self._PadToBoundingBox(x, offset_height, offset_width,
target_height, target_width,
use_tensor_inputs)
except Exception as e:
if err_msg not in str(e):
raise
else:
raise AssertionError('Exception not raised: %s' % err_msg)
def _assertShapeInference(self, pre_shape, height, width, post_shape):
image = array_ops.placeholder(dtypes.float32, shape=pre_shape)
y = image_ops.pad_to_bounding_box(image, 0, 0, height, width)
self.assertEqual(y.get_shape().as_list(), post_shape)
def testNoOp(self):
x_shape = [10, 10, 10]
x = np.random.uniform(size=x_shape)
offset_height, offset_width = [0, 0]
self._assertReturns(x, x_shape, offset_height, offset_width, x, x_shape)
def testPadding(self):
x = [1, 2, 3,
4, 5, 6,
7, 8, 9]
x_shape = [3, 3, 1]
offset_height, offset_width = [1, 0]
y = [0, 0, 0,
1, 2, 3,
4, 5, 6,
7, 8, 9]
y_shape = [4, 3, 1]
self._assertReturns(x, x_shape, offset_height, offset_width, y, y_shape)
offset_height, offset_width = [0, 1]
y = [0, 1, 2, 3,
0, 4, 5, 6,
0, 7, 8, 9]
y_shape = [3, 4, 1]
self._assertReturns(x, x_shape, offset_height, offset_width, y, y_shape)
offset_height, offset_width = [0, 0]
y = [1, 2, 3,
4, 5, 6,
7, 8, 9,
0, 0, 0]
y_shape = [4, 3, 1]
self._assertReturns(x, x_shape, offset_height, offset_width, y, y_shape)
offset_height, offset_width = [0, 0]
y = [1, 2, 3, 0,
4, 5, 6, 0,
7, 8, 9, 0]
y_shape = [3, 4, 1]
self._assertReturns(x, x_shape, offset_height, offset_width, y, y_shape)
def testShapeInference(self):
self._assertShapeInference([55, 66, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([50, 60, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([None, 66, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([None, 60, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([55, None, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([50, None, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([None, None, 3], 55, 66, [55, 66, 3])
self._assertShapeInference([55, 66, None], 55, 66, [55, 66, None])
self._assertShapeInference([50, 60, None], 55, 66, [55, 66, None])
self._assertShapeInference([None, None, None], 55, 66, [55, 66, None])
self._assertShapeInference(None, 55, 66, [55, 66, None])
def testNon3DInput(self):
# Input image is not 3D
x = [0] * 15
offset_height, offset_width = [0, 0]
target_height, target_width = [2, 2]
for x_shape in ([1, 3, 5, 1], [3, 5]):
self._assertRaises(x, x_shape, offset_height, offset_width,
target_height, target_width,
"'image' must be three-dimensional")
def testZeroLengthInput(self):
# Input image has 0-length dimension(s).
# Each line is a test configuration:
# x_shape, target_height, target_width
test_config = (([0, 2, 2], 2, 2),
([2, 0, 2], 2, 2),
([2, 2, 0], 2, 2))
offset_height, offset_width = [0, 0]
x = []
for x_shape, target_height, target_width in test_config:
self._assertRaises(x, x_shape, offset_height, offset_width,
target_height, target_width,
"all dims of 'image.shape' must be > 0",
use_tensor_inputs_options=[False])
# The orignal error message does not contain back slashes. However, they
# are added by either the assert op or the runtime. If this behaviour
# changes in the future, the match string will also needs to be changed.
self._assertRaises(x, x_shape, offset_height, offset_width,
target_height, target_width,
"all dims of \\'image.shape\\' must be > 0",
use_tensor_inputs_options=[True])
def testBadParams(self):
x_shape = [3, 3, 1]
x = np.zeros(x_shape)
# Each line is a test configuration:
# offset_height, offset_width, target_height, target_width, err_msg
test_config = ((-1, 0, 4, 4, 'offset_height must be >= 0'),
( 0,-1, 4, 4, 'offset_width must be >= 0'),
( 2, 0, 4, 4, 'height must be <= target - offset'),
( 0, 2, 4, 4, 'width must be <= target - offset'))
for config_item in test_config:
self._assertRaises(x, x_shape, *config_item)
class SelectDistortedCropBoxTest(test_util.TensorFlowTestCase):
def _testSampleDistortedBoundingBox(self, image, bounding_box,
min_object_covered, aspect_ratio_range,
area_range):
original_area = float(np.prod(image.shape))
bounding_box_area = float((bounding_box[3] - bounding_box[1]) *
(bounding_box[2] - bounding_box[0]))
image_size_np = np.array(image.shape, dtype=np.int32)
bounding_box_np = (np.array(bounding_box, dtype=np.float32)
.reshape([1, 1, 4]))
aspect_ratios = []
area_ratios = []
fraction_object_covered = []
num_iter = 1000
with self.test_session(use_gpu=True):
image_tf = constant_op.constant(image,
shape=image.shape)
image_size_tf = constant_op.constant(image_size_np,
shape=image_size_np.shape)
bounding_box_tf = constant_op.constant(bounding_box_np,
dtype=dtypes.float32,
shape=bounding_box_np.shape)
begin, end, _ = image_ops.sample_distorted_bounding_box(
image_size=image_size_tf,
bounding_boxes=bounding_box_tf,
min_object_covered=min_object_covered,
aspect_ratio_range=aspect_ratio_range,
area_range=area_range)
y = array_ops.slice(image_tf, begin, end)
for _ in xrange(num_iter):
y_tf = y.eval()
crop_height = y_tf.shape[0]
crop_width = y_tf.shape[1]
aspect_ratio = float(crop_width) / float(crop_height)
area = float(crop_width * crop_height)
aspect_ratios.append(aspect_ratio)
area_ratios.append(area / original_area)
fraction_object_covered.append(float(np.sum(y_tf)) / bounding_box_area)
# Ensure that each entry is observed within 3 standard deviations.
# num_bins = 10
# aspect_ratio_hist, _ = np.histogram(aspect_ratios,
# bins=num_bins,
# range=aspect_ratio_range)
# mean = np.mean(aspect_ratio_hist)
# stddev = np.sqrt(mean)
# TODO(wicke, shlens, dga): Restore this test so that it is no longer flaky.
# TODO(irving): Since the rejection probability is not independent of the
# aspect ratio, the aspect_ratio random value is not exactly uniformly
# distributed in [min_aspect_ratio, max_aspect_ratio). This test should be
# fixed to reflect the true statistical property, then tightened to enforce
# a stricter bound. Or, ideally, the sample_distorted_bounding_box Op
# be fixed to not use rejection sampling and generate correctly uniform
# aspect ratios.
# self.assertAllClose(aspect_ratio_hist,
# [mean] * num_bins, atol=3.6 * stddev)
# The resulting crop will not be uniformly distributed in area. In practice,
# we find that the area skews towards the small sizes. Instead, we perform
# a weaker test to ensure that the area ratios are merely within the
# specified bounds.
self.assertLessEqual(max(area_ratios), area_range[1])
self.assertGreaterEqual(min(area_ratios), area_range[0])
# For reference, here is what the distribution of area ratios look like.
area_ratio_hist, _ = np.histogram(area_ratios, bins=10, range=area_range)
print('area_ratio_hist ', area_ratio_hist)
# Ensure that fraction_object_covered is satisfied.
# TODO(wicke, shlens, dga): Restore this test so that it is no longer flaky.
# self.assertGreaterEqual(min(fraction_object_covered), min_object_covered)
def testWholeImageBoundingBox(self):
height = 40
width = 50
image_size = [height, width, 1]
bounding_box = [0.0, 0.0, 1.0, 1.0]
image = np.arange(0, np.prod(image_size),
dtype=np.int32).reshape(image_size)
self._testSampleDistortedBoundingBox(image,
bounding_box,
min_object_covered=0.1,
aspect_ratio_range=(0.75, 1.33),
area_range=(0.05, 1.0))
def testWithBoundingBox(self):
height = 40
width = 50
x_shape = [height, width, 1]
image = np.zeros(x_shape, dtype=np.int32)
# Create an object with 1's in a region with area A and require that
# the total pixel values >= 0.1 * A.
min_object_covered = 0.1
xmin = 2
ymin = 3
xmax = 12
ymax = 13
for x in np.arange(xmin, xmax + 1, 1):
for y in np.arange(ymin, ymax + 1, 1):
image[x, y] = 1
# Bounding box is specified as (ymin, xmin, ymax, xmax) in
# relative coordinates.
bounding_box = (float(ymin) / height, float(xmin) / width,
float(ymax) / height, float(xmax) / width)
self._testSampleDistortedBoundingBox(image,
bounding_box=bounding_box,
min_object_covered=min_object_covered,
aspect_ratio_range=(0.75, 1.33),