def testReturnCorrectCropOfSingleImage(self):
np.random.seed(0)
height, width = 10, 20
image = np.random.randint(0, 256, size=(height, width, 3))
crop_height, crop_width = 2, 4
image_placeholder = tf.placeholder(tf.int32, shape=(None, None, 3))
[cropped] = preprocess_utils.random_crop([image_placeholder],
crop_height,
crop_width)
with self.test_session():
cropped_image = cropped.eval(feed_dict={image_placeholder: image})
# Ensure we can find the cropped image in the original:
is_found = False
for x in range(0, width - crop_width + 1):
for y in range(0, height - crop_height + 1):
if np.isclose(image[y:y+crop_height, x:x+crop_width, :],
cropped_image).all():
is_found = True
break
self.assertTrue(is_found)
def testReturnCorrectCropOfSingleImage(self):
np.random.seed(0)
height, width = 10, 20
image = np.random.randint(0, 256, size=(height, width, 3))
crop_height, crop_width = 2, 4
image_placeholder = tf.placeholder(tf.int32, shape=(None, None, 3))
[cropped] = preprocess_utils.random_crop([image_placeholder],
crop_height, crop_width)
with self.test_session():
cropped_image = cropped.eval(feed_dict={image_placeholder: image})
# Ensure we can find the cropped image in the original:
is_found = False
for x in range(0, width - crop_width + 1):
for y in range(0, height - crop_height + 1):
if np.isclose(image[y:y + crop_height, x:x + crop_width, :],
cropped_image).all():
is_found = True
break
self.assertTrue(is_found)
def testDieOnRandomCropWhenImagesWithDifferentWidth(self):
crop_height, crop_width = 2, 3
image1 = tf.placeholder(tf.float32, name='image1', shape=(None, None, 3))
image2 = tf.placeholder(tf.float32, name='image2', shape=(None, None, 1))
cropped = preprocess_utils.random_crop(
[image1, image2], crop_height, crop_width)
with self.test_session() as sess:
with self.assertRaises(errors.InvalidArgumentError):
sess.run(cropped, feed_dict={image1: np.random.rand(4, 5, 3),
image2: np.random.rand(4, 6, 1)})
def testDieOnRandomCropWhenImagesWithDifferentWidth(self):
crop_height, crop_width = 2, 3
image1 = tf.placeholder(tf.float32, name='image1', shape=(None, None, 3))
image2 = tf.placeholder(tf.float32, name='image2', shape=(None, None, 1))
cropped = preprocess_utils.random_crop(
[image1, image2], crop_height, crop_width)
with self.test_session() as sess:
with self.assertRaises(errors.InvalidArgumentError):
sess.run(cropped, feed_dict={image1: np.random.rand(4, 5, 3),
image2: np.random.rand(4, 6, 1)})
def testDieOnRandomCropWhenCropSizeIsGreaterThanImage(self):
crop_height, crop_width = 5, 9
image1 = tf.placeholder(tf.float32, name='image1', shape=(None, None, 3))
image2 = tf.placeholder(tf.float32, name='image2', shape=(None, None, 1))
cropped = preprocess_utils.random_crop(
[image1, image2], crop_height, crop_width)
with self.test_session() as sess:
with self.assertRaisesWithPredicateMatch(
errors.InvalidArgumentError,
'Crop size greater than the image size.'):
sess.run(cropped, feed_dict={image1: np.random.rand(4, 5, 3),
image2: np.random.rand(4, 5, 1)})
def testReturnDifferentCropAreasOnTwoEvals(self):
tf.set_random_seed(0)
crop_height, crop_width = 2, 3
image = np.random.randint(0, 256, size=(100, 200, 3))
image_placeholder = tf.placeholder(tf.int32, shape=(None, None, 3))
[cropped] = preprocess_utils.random_crop([image_placeholder],
crop_height, crop_width)
with self.test_session():
crop0 = cropped.eval(feed_dict={image_placeholder: image})
crop1 = cropped.eval(feed_dict={image_placeholder: image})
self.assertFalse(np.isclose(crop0, crop1).all())
def testDieOnRandomCropWhenCropSizeIsGreaterThanImage(self):
crop_height, crop_width = 5, 9
image1 = tf.placeholder(tf.float32, name='image1', shape=(None, None, 3))
image2 = tf.placeholder(tf.float32, name='image2', shape=(None, None, 1))
cropped = preprocess_utils.random_crop(
[image1, image2], crop_height, crop_width)
with self.test_session() as sess:
with self.assertRaisesWithPredicateMatch(
errors.InvalidArgumentError,
'Crop size greater than the image size.'):
sess.run(cropped, feed_dict={image1: np.random.rand(4, 5, 3),
image2: np.random.rand(4, 5, 1)})
def testReturnDifferentCropAreasOnTwoEvals(self):
tf.set_random_seed(0)
crop_height, crop_width = 2, 3
image = np.random.randint(0, 256, size=(100, 200, 3))
image_placeholder = tf.placeholder(tf.int32, shape=(None, None, 3))
[cropped] = preprocess_utils.random_crop(
[image_placeholder], crop_height, crop_width)
with self.test_session():
crop0 = cropped.eval(feed_dict={image_placeholder: image})
crop1 = cropped.eval(feed_dict={image_placeholder: image})
self.assertFalse(np.isclose(crop0, crop1).all())
def testRandomCropMaintainsNumberOfChannels(self):
np.random.seed(0)
crop_height, crop_width = 10, 20
image = np.random.randint(0, 256, size=(100, 200, 3))
tf.set_random_seed(37)
image_placeholder = tf.placeholder(tf.int32, shape=(None, None, 3))
[cropped] = preprocess_utils.random_crop(
[image_placeholder], crop_height, crop_width)
with self.test_session():
cropped_image = cropped.eval(feed_dict={image_placeholder: image})
self.assertTupleEqual(cropped_image.shape, (crop_height, crop_width, 3))
def testRandomCropMaintainsNumberOfChannels(self):
np.random.seed(0)
crop_height, crop_width = 10, 20
image = np.random.randint(0, 256, size=(100, 200, 3))
tf.set_random_seed(37)
image_placeholder = tf.placeholder(tf.int32, shape=(None, None, 3))
[cropped] = preprocess_utils.random_crop(
[image_placeholder], crop_height, crop_width)
with self.test_session():
cropped_image = cropped.eval(feed_dict={image_placeholder: image})
self.assertTupleEqual(cropped_image.shape, (crop_height, crop_width, 3))
def testReturnConsistenCropsOfImagesInTheList(self):
tf.set_random_seed(0)
height, width = 10, 20
crop_height, crop_width = 2, 3
labels = np.linspace(0, height * width-1, height * width)
labels = labels.reshape((height, width, 1))
image = np.tile(labels, (1, 1, 3))
image_placeholder = tf.placeholder(tf.int32, shape=(None, None, 3))
label_placeholder = tf.placeholder(tf.int32, shape=(None, None, 1))
[cropped_image, cropped_label] = preprocess_utils.random_crop(
[image_placeholder, label_placeholder], crop_height, crop_width)
with self.test_session() as sess:
cropped_image, cropped_labels = sess.run([cropped_image, cropped_label],
feed_dict={
image_placeholder: image,
label_placeholder: labels})
for i in range(3):
self.assertAllEqual(cropped_image[:, :, i], cropped_labels.squeeze())
def testReturnConsistenCropsOfImagesInTheList(self):
tf.set_random_seed(0)
height, width = 10, 20
crop_height, crop_width = 2, 3
labels = np.linspace(0, height * width-1, height * width)
labels = labels.reshape((height, width, 1))
image = np.tile(labels, (1, 1, 3))
image_placeholder = tf.placeholder(tf.int32, shape=(None, None, 3))
label_placeholder = tf.placeholder(tf.int32, shape=(None, None, 1))
[cropped_image, cropped_label] = preprocess_utils.random_crop(
[image_placeholder, label_placeholder], crop_height, crop_width)
with self.test_session() as sess:
cropped_image, cropped_labels = sess.run([cropped_image, cropped_label],
feed_dict={
image_placeholder: image,
label_placeholder: labels})
for i in range(3):
self.assertAllEqual(cropped_image[:, :, i], cropped_labels.squeeze())
def preprocess_images_and_labels_consistently(images,
labels,
crop_height,
crop_width,
min_resize_value=None,
max_resize_value=None,
resize_factor=None,
min_scale_factor=1.,
max_scale_factor=1.,
scale_factor_step_size=0,
ignore_label=255,
is_training=True,
model_variant=None):
"""Preprocesses images and labels in a consistent way.
Similar to preprocess_image_and_label, but works on a list of images
and a list of labels and uses the same crop coordinates and either flips
all images and labels or none of them.
Args:
images: List of input images.
labels: List of ground truth annotation labels.
crop_height: The height value used to crop the image and label.
crop_width: The width value used to crop the image and label.
min_resize_value: Desired size of the smaller image side.
max_resize_value: Maximum allowed size of the larger image side.
resize_factor: Resized dimensions are multiple of factor plus one.
min_scale_factor: Minimum scale factor value.
max_scale_factor: Maximum scale factor value.
scale_factor_step_size: The step size from min scale factor to max scale
factor. The input is randomly scaled based on the value of
(min_scale_factor, max_scale_factor, scale_factor_step_size).
ignore_label: The label value which will be ignored for training and
evaluation.
is_training: If the preprocessing is used for training or not.
model_variant: Model variant (string) for choosing how to mean-subtract the
images. See feature_extractor.network_map for supported model variants.
Returns:
original_images: Original images (could be resized).
processed_images: Preprocessed images.
labels: Preprocessed ground truth segmentation labels.
Raises:
ValueError: Ground truth label not provided during training.
"""
if is_training and labels is None:
raise ValueError('During training, labels must be provided.')
if model_variant is None:
tf.logging.warning(
'Default mean-subtraction is performed. Please specify '
'a model_variant. See feature_extractor.network_map for '
'supported model variants.')
if labels is not None:
assert len(images) == len(labels)
num_imgs = len(images)
# Keep reference to original images.
original_images = images
processed_images = [tf.cast(image, tf.float32) for image in images]
if labels is not None:
labels = [tf.cast(label, tf.int32) for label in labels]
# Resize images and labels to the desired range.
if min_resize_value is not None or max_resize_value is not None:
processed_images, labels = zip(*[
preprocess_utils.resize_to_range(image=processed_image,
label=label,
min_size=min_resize_value,
max_size=max_resize_value,
factor=resize_factor,
align_corners=True)
for processed_image, label in zip(processed_images, labels)
])
# The `original_images` becomes the resized images.
original_images = [
tf.identity(processed_image)
for processed_image in processed_images
]
# Data augmentation by randomly scaling the inputs.
scale = get_random_scale(min_scale_factor, max_scale_factor,
scale_factor_step_size)
processed_images, labels = zip(*[
randomly_scale_image_and_label(processed_image, label, scale)
for processed_image, label in zip(processed_images, labels)
])
for processed_image in processed_images:
processed_image.set_shape([None, None, 3])
if crop_height is not None and crop_width is not None:
# Pad image and label to have dimensions >= [crop_height, crop_width].
image_shape = tf.shape(processed_images[0])
image_height = image_shape[0]
image_width = image_shape[1]
target_height = image_height + tf.maximum(crop_height - image_height,
0)
target_width = image_width + tf.maximum(crop_width - image_width, 0)
# Pad image with mean pixel value.
mean_pixel = tf.reshape(feature_extractor.mean_pixel(model_variant),
[1, 1, 3])
processed_images = [
preprocess_utils.pad_to_bounding_box(processed_image, 0, 0,
target_height, target_width,
mean_pixel)
for processed_image in processed_images
]
if labels is not None:
labels = [
preprocess_utils.pad_to_bounding_box(label, 0, 0,
target_height,
target_width,
ignore_label)
for label in labels
]
# Randomly crop the images and labels.
if is_training and labels is not None:
cropped = preprocess_utils.random_crop(processed_images + labels,
crop_height, crop_width)
assert len(cropped) == 2 * num_imgs
processed_images = cropped[:num_imgs]
labels = cropped[num_imgs:]
for processed_image in processed_images:
processed_image.set_shape([crop_height, crop_width, 3])
if labels is not None:
for label in labels:
label.set_shape([crop_height, crop_width, 1])
if is_training:
# Randomly left-right flip the image and label.
res = preprocess_utils.flip_dim(list(processed_images + labels),
_PROB_OF_FLIP,
dim=1)
maybe_flipped = res[:-1]
assert len(maybe_flipped) == 2 * num_imgs
processed_images = maybe_flipped[:num_imgs]
labels = maybe_flipped[num_imgs:]
return original_images, processed_images, labels
def preprocess_image_and_label(
image, # 预处理图像和标签
label,
crop_height,
crop_width,
min_resize_value=None,
max_resize_value=None,
resize_factor=None,
min_scale_factor=1.,
max_scale_factor=1.,
scale_factor_step_size=0,
ignore_label=255,
is_training=True,
model_variant=None):
"""Preprocesses the image and label.
Args:
image: Input image.
label: Ground truth annotation label.
crop_height: The height value used to crop the image and label.
crop_width: The width value used to crop the image and label.
min_resize_value: Desired size of the smaller image side.
max_resize_value: Maximum allowed size of the larger image side.
resize_factor: Resized dimensions are multiple of factor plus one.
min_scale_factor: Minimum scale factor value.
max_scale_factor: Maximum scale factor value.
scale_factor_step_size: The step size from min scale factor to max scale
factor. The input is randomly scaled based on the value of
(min_scale_factor, max_scale_factor, scale_factor_step_size).
ignore_label: The label value which will be ignored for training and
evaluation.
is_training: If the preprocessing is used for training or not.
model_variant: Model variant (string) for choosing how to mean-subtract the
images. See feature_extractor.network_map for supported model variants.
Returns:
original_image: Original image (could be resized).
processed_image: Preprocessed image.
label: Preprocessed ground truth segmentation label.
Raises:
ValueError: Ground truth label not provided during training.
"""
if is_training and label is None:
raise ValueError('During training, label must be provided.')
if model_variant is None: # 未指定模型
tf.logging.warning(
'Default mean-subtraction is performed. Please specify '
'a model_variant. See feature_extractor.network_map for '
'supported model variants.')
# Keep reference to original image.
original_image = image # 保存原始图像
processed_image = tf.cast(image, tf.float32) # 转换像素值为float
if label is not None:
label = tf.cast(label, tf.int32) #将label转化成float
# Resize image and label to the desired range. 缩放图像尺度
if min_resize_value or max_resize_value: # 输入中为者都为None 暂不考虑
[processed_image,
label] = (preprocess_utils.resize_to_range(image=processed_image,
label=label,
min_size=min_resize_value,
max_size=max_resize_value,
factor=resize_factor,
align_corners=True))
# The `original_image` becomes the resized image.
original_image = tf.identity(processed_image)
# Data augmentation by randomly scaling the inputs.
# 随机缩放输入图像来进行数据增强
if is_training:
scale = preprocess_utils.get_random_scale( # 随机获取一个变换尺度
min_scale_factor, max_scale_factor, scale_factor_step_size)
# 通过得到的尺度进行 image和label的尺度变换
processed_image, label = preprocess_utils.randomly_scale_image_and_label(
processed_image, label, scale)
processed_image.set_shape([None, None, 3])
# Pad image and label to have dimensions >= [crop_height, crop_width]
# 填补image和label 当处理后的图像高度和宽度比裁剪的尺寸大
image_shape = tf.shape(processed_image)
image_height = image_shape[0]
image_width = image_shape[1]
# 选择原图尺度和裁剪尺度中较大的
target_height = image_height + tf.maximum(crop_height - image_height, 0)
target_width = image_width + tf.maximum(crop_width - image_width, 0)
# Pad image with mean pixel value.
# 用平均像素填补图像
mean_pixel = tf.reshape(feature_extractor.mean_pixel(model_variant),
[1, 1, 3])
# 根据target_height 和 target_width 进行补 0
processed_image = preprocess_utils.pad_to_bounding_box(
processed_image, 0, 0, target_height, target_width, mean_pixel)
if label is not None:
label = preprocess_utils.pad_to_bounding_box( # label进行填充补0
label, 0, 0, target_height, target_width, ignore_label)
# Randomly crop the image and label.
# 随机裁剪图像和标签
if is_training and label is not None:
# 裁剪被给的图像列表
processed_image, label = preprocess_utils.random_crop(
[processed_image, label], crop_height, crop_width)
processed_image.set_shape([crop_height, crop_width, 3])
if label is not None:
label.set_shape([crop_height, crop_width, 1])
if is_training:
# Randomly left-right flip the image and label.
# 随机左右翻转输入的图像进行数据增强
processed_image, label, _ = preprocess_utils.flip_dim(
[processed_image, label], _PROB_OF_FLIP, dim=1)
return original_image, processed_image, label
def preprocess_image_and_label(image,
label,
crop_height,
crop_width,
min_resize_value=None,
max_resize_value=None,
resize_factor=None,
min_scale_factor=1.,
max_scale_factor=1.,
scale_factor_step_size=0,
ignore_label=255,
is_training=True,
model_variant=None):
"""Preprocesses the image and label.
Args:
image: Input image.
label: Ground truth annotation label.
crop_height: The height value used to crop the image and label.
crop_width: The width value used to crop the image and label.
min_resize_value: Desired size of the smaller image side.
max_resize_value: Maximum allowed size of the larger image side.
resize_factor: Resized dimensions are multiple of factor plus one.
min_scale_factor: Minimum scale factor value.
max_scale_factor: Maximum scale factor value.
scale_factor_step_size: The step size from min scale factor to max scale
factor. The input is randomly scaled based on the value of
(min_scale_factor, max_scale_factor, scale_factor_step_size).
ignore_label: The label value which will be ignored for training and
evaluation.
is_training: If the preprocessing is used for training or not.
model_variant: Model variant (string) for choosing how to mean-subtract the
images. See feature_extractor.network_map for supported model variants.
Returns:
original_image: Original image (could be resized).
processed_image: Preprocessed image.
label: Preprocessed ground truth segmentation label.
Raises:
ValueError: Ground truth label not provided during training.
"""
if is_training and label is None:
raise ValueError('During training, label must be provided.')
if model_variant is None:
tf.logging.warning(
'Default mean-subtraction is performed. Please specify '
'a model_variant. See feature_extractor.network_map for '
'supported model variants.')
# Keep reference to original image.
original_image = image
processed_image = tf.cast(image, tf.float32)
if label is not None:
label = tf.cast(label, tf.int32)
# Resize image and label to the desired range.
if min_resize_value is not None or max_resize_value is not None:
[processed_image,
label] = (preprocess_utils.resize_to_range(image=processed_image,
label=label,
min_size=min_resize_value,
max_size=max_resize_value,
factor=resize_factor,
align_corners=True))
# The `original_image` becomes the resized image.
original_image = tf.identity(processed_image)
# Data augmentation by randomly scaling the inputs.
scale = get_random_scale(min_scale_factor, max_scale_factor,
scale_factor_step_size)
processed_image, label = randomly_scale_image_and_label(
processed_image, label, scale)
processed_image.set_shape([None, None, 3])
if crop_height is not None and crop_width is not None:
# Pad image and label to have dimensions >= [crop_height, crop_width].
image_shape = tf.shape(processed_image)
image_height = image_shape[0]
image_width = image_shape[1]
target_height = image_height + tf.maximum(crop_height - image_height,
0)
target_width = image_width + tf.maximum(crop_width - image_width, 0)
# Pad image with mean pixel value.
mean_pixel = tf.reshape(feature_extractor.mean_pixel(model_variant),
[1, 1, 3])
processed_image = preprocess_utils.pad_to_bounding_box(
processed_image, 0, 0, target_height, target_width, mean_pixel)
if label is not None:
label = preprocess_utils.pad_to_bounding_box(
label, 0, 0, target_height, target_width, ignore_label)
# Randomly crop the image and label.
if is_training and label is not None:
processed_image, label = preprocess_utils.random_crop(
[processed_image, label], crop_height, crop_width)
processed_image.set_shape([crop_height, crop_width, 3])
if label is not None:
label.set_shape([crop_height, crop_width, 1])
if is_training:
# Randomly left-right flip the image and label.
processed_image, label, _ = preprocess_utils.flip_dim(
[processed_image, label], _PROB_OF_FLIP, dim=1)
return original_image, processed_image, label
def preprocess_image_and_label(image,
label,
crop_height,
crop_width,
min_resize_value=None,
max_resize_value=None,
resize_factor=None,
min_scale_factor=1.,
max_scale_factor=1.,
scale_factor_step_size=0,
ignore_label=255,
is_training=True,
model_variant=None):
"""Preprocesses the image and label.
Args:
image: Input image.
label: Ground truth annotation label.
crop_height: The height value used to crop the image and label.
crop_width: The width value used to crop the image and label.
min_resize_value: Desired size of the smaller image side.
max_resize_value: Maximum allowed size of the larger image side.
resize_factor: Resized dimensions are multiple of factor plus one.
min_scale_factor: Minimum scale factor value.
max_scale_factor: Maximum scale factor value.
scale_factor_step_size: The step size from min scale factor to max scale
factor. The input is randomly scaled based on the value of
(min_scale_factor, max_scale_factor, scale_factor_step_size).
ignore_label: The label value which will be ignored for training and
evaluation.
is_training: If the preprocessing is used for training or not.
model_variant: Model variant (string) for choosing how to mean-subtract the
images. See feature_extractor.network_map for supported model variants.
Returns:
original_image: Original image (could be resized).
processed_image: Preprocessed image.
label: Preprocessed ground truth segmentation label.
Raises:
ValueError: Ground truth label not provided during training.
"""
if is_training and label is None:
raise ValueError('During training, label must be provided.')
if model_variant is None:
tf.logging.warning('Default mean-subtraction is performed. Please specify '
'a model_variant. See feature_extractor.network_map for '
'supported model variants.')
# Keep reference to original image.
original_image = image
processed_image = tf.cast(image, tf.float32)
if label is not None:
label = tf.cast(label, tf.int32)
# Resize image and label to the desired range.
if min_resize_value is not None or max_resize_value is not None:
[processed_image, label] = (
preprocess_utils.resize_to_range(
image=processed_image,
label=label,
min_size=min_resize_value,
max_size=max_resize_value,
factor=resize_factor,
align_corners=True))
# The `original_image` becomes the resized image.
original_image = tf.identity(processed_image)
# Data augmentation by randomly scaling the inputs.
scale = preprocess_utils.get_random_scale(
min_scale_factor, max_scale_factor, scale_factor_step_size)
processed_image, label = preprocess_utils.randomly_scale_image_and_label(
processed_image, label, scale)
processed_image.set_shape([None, None, 3])
# Pad image and label to have dimensions >= [crop_height, crop_width]
image_shape = tf.shape(processed_image)
image_height = image_shape[0]
image_width = image_shape[1]
target_height = image_height + tf.maximum(crop_height - image_height, 0)
target_width = image_width + tf.maximum(crop_width - image_width, 0)
# Pad image with mean pixel value.
mean_pixel = tf.reshape(
feature_extractor.mean_pixel(model_variant), [1, 1, 3])
processed_image = preprocess_utils.pad_to_bounding_box(
processed_image, 0, 0, target_height, target_width, mean_pixel)
if label is not None:
label = preprocess_utils.pad_to_bounding_box(
label, 0, 0, target_height, target_width, ignore_label)
# Randomly crop the image and label.
if is_training and label is not None:
processed_image, label = preprocess_utils.random_crop(
[processed_image, label], crop_height, crop_width)
processed_image.set_shape([crop_height, crop_width, 3])
if label is not None:
label.set_shape([crop_height, crop_width, 1])
if is_training:
# Randomly left-right flip the image and label.
processed_image, label, _ = preprocess_utils.flip_dim(
[processed_image, label], _PROB_OF_FLIP, dim=1)
return original_image, processed_image, label
def preprocess_image_and_label(image,
label,
crop_height,
crop_width,
min_resize_value=None,
max_resize_value=None,
resize_factor=None,
min_scale_factor=1.,
max_scale_factor=1.,
scale_factor_step_size=0,
ignore_label=255,
is_training=True,
model_variant=None):
"""Preprocesses the image and label.
Args:
image: Input image.
label: Ground truth annotation label.
crop_height: The height value used to crop the image and label.
crop_width: The width value used to crop the image and label.
min_resize_value: Desired size of the smaller image side.
max_resize_value: Maximum allowed size of the larger image side.
resize_factor: Resized dimensions are multiple of factor plus one.
min_scale_factor: Minimum scale factor value.
max_scale_factor: Maximum scale factor value.
scale_factor_step_size: The step size from min scale factor to max scale
factor. The input is randomly scaled based on the value of
(min_scale_factor, max_scale_factor, scale_factor_step_size).
ignore_label: The label value which will be ignored for training and
evaluation.
is_training: If the preprocessing is used for training or not.
model_variant: Model variant (string) for choosing how to mean-subtract the
images. See feature_extractor.network_map for supported model variants.
Returns:
original_image: Original image (could be resized).
processed_image: Preprocessed image.
label: Preprocessed ground truth segmentation label.
Raises:
ValueError: Ground truth label not provided during training.
"""
if is_training and label is None:
raise ValueError('During training, label must be provided.')
if model_variant is None:
tf.logging.warning(
'Default mean-subtraction is performed. Please specify '
'a model_variant. See feature_extractor.network_map for '
'supported model variants.')
# Keep reference to original image.
original_image = image
processed_image = tf.cast(image, tf.float32)
if label is not None:
label = tf.cast(label, tf.int32)
# Resize image and label to the desired range.
if min_resize_value or max_resize_value:
[processed_image,
label] = (preprocess_utils.resize_to_range(image=processed_image,
label=label,
min_size=min_resize_value,
max_size=max_resize_value,
factor=resize_factor,
align_corners=True))
# The `original_image` becomes the resized image.
original_image = tf.identity(processed_image)
# Data augmentation by randomly scaling the inputs.
if is_training:
scale = preprocess_utils.get_random_scale(min_scale_factor,
max_scale_factor,
scale_factor_step_size)
processed_image, label = preprocess_utils.randomly_scale_image_and_label(
processed_image, label, scale)
processed_image.set_shape([None, None, 3])
# Pad image and label to have dimensions >= [crop_height, crop_width]
image_shape = tf.shape(processed_image)
image_height = image_shape[0]
image_width = image_shape[1]
target_height = image_height + tf.maximum(crop_height - image_height, 0)
target_width = image_width + tf.maximum(crop_width - image_width, 0)
# Pad image with mean pixel value.
mean_pixel = tf.reshape(feature_extractor.mean_pixel(model_variant),
[1, 1, 3])
processed_image = preprocess_utils.pad_to_bounding_box(
processed_image, 0, 0, target_height, target_width, mean_pixel)
if label is not None:
label = preprocess_utils.pad_to_bounding_box(label, 0, 0,
target_height,
target_width,
ignore_label)
# Randomly crop the image and label.
if is_training and label is not None:
processed_image, label = preprocess_utils.random_crop(
[processed_image, label], crop_height, crop_width)
processed_image.set_shape([crop_height, crop_width, 3])
if label is not None:
label.set_shape([crop_height, crop_width, 1])
if is_training:
# Randomly left-right flip the image and label.
processed_image, label, _ = preprocess_utils.flip_dim(
[processed_image, label], _PROB_OF_FLIP, dim=1)
# def aug_image(image):
# # 亮度
# image = tf.image.random_brightness(image, max_delta=0.1, seed=None)
# # 对比度
# image = tf.image.random_contrast(image, lower=0.9, upper=1.3, seed=None)
# # 色度
# image = tf.image.random_hue(image, max_delta=0.05, seed=None)
# # 饱和度
# image = tf.image.random_saturation(image, lower=0.7, upper=1.3, seed=None)
#
# image = image + tf.random_normal(shape=(crop_height, crop_width, 3), mean=0, stddev=5, dtype=tf.float32, seed=2)
# image = tf.clip_by_value(image, 0.0, 255.0)
#
# return image
# if is_training:
# random = tf.random_uniform([], 0, 1, seed=2)
# processed_image = tf.cond(random < 0.3, lambda: processed_image, lambda: aug_image(processed_image))
def _aug_image(image, label):
aug = A.Compose([
A.OneOf(
[
A.HorizontalFlip(p=1),
A.VerticalFlip(p=1),
A.RandomRotate90(p=1),
A.Transpose(p=1)
],
p=0.8,
)
])
auged = aug(image=image, mask=label)
aug_img = auged['image']
aug_label = auged['mask']
return aug_img, aug_label
def aug_image(image, label):
processed_image, processed_label = tf.py_func(_aug_image,
[image, label],
[tf.float32, tf.int32])
return processed_image, processed_label
# print(processed_image.get_shape().as_list())
# print(label.get_shape().as_list())
if is_training:
processed_image, label = aug_image(processed_image, label)
processed_image.set_shape([crop_height, crop_width, 3])
label.set_shape([crop_height, crop_width, 1])
print(processed_image.get_shape().as_list())
print(label.get_shape().as_list())
# processed_image.set_shape([crop_height, crop_width, 3])
# label.set_shape([crop_height, crop_width, 1])
return original_image, processed_image, label
def preprocess_image_and_label(image,
label,
crop_height,
crop_width,
min_resize_value=None,
max_resize_value=None,
resize_factor=None,
min_scale_factor=1.,
max_scale_factor=1.,
scale_factor_step_size=0,
ignore_label=255,
is_training=True,
model_variant=None,
non_uniform_sampling=None,
output_target_sampling=False):
"""Preprocesses the image and label.
Args:
image: Input image.
label: Ground truth annotation label.
crop_height: The height value used to crop the image and label.
crop_width: The width value used to crop the image and label.
min_resize_value: Desired size of the smaller image side.
max_resize_value: Maximum allowed size of the larger image side.
resize_factor: Resized dimensions are multiple of factor plus one.
min_scale_factor: Minimum scale factor value.
max_scale_factor: Maximum scale factor value.
scale_factor_step_size: The step size from min scale factor to max scale
factor. The input is randomly scaled based on the value of
(min_scale_factor, max_scale_factor, scale_factor_step_size).
ignore_label: The label value which will be ignored for training and
evaluation.
is_training: If the preprocessing is used for training or not.
model_variant: Model variant (string) for choosing how to mean-subtract the
images. See feature_extractor.network_map for supported model variants.
Returns:
original_image: Original image (could be resized).
processed_image: Preprocessed image.
label: Preprocessed ground truth segmentation label.
Raises:
ValueError: Ground truth label not provided during training.
"""
if is_training and label is None:
raise ValueError('During training, label must be provided.')
if model_variant is None:
tf.logging.warning(
'Default mean-subtraction is performed. Please specify '
'a model_variant. See feature_extractor.network_map for '
'supported model variants.')
# Keep reference to original image.
original_image = image
processed_image = tf.cast(image, tf.float32)
if label is not None:
label = tf.cast(label, tf.int32)
# Resize image and label to the desired range.
if not output_target_sampling and (min_resize_value or max_resize_value):
[processed_image,
label] = (preprocess_utils.resize_to_range(image=processed_image,
label=label,
min_size=min_resize_value,
max_size=max_resize_value,
factor=resize_factor,
align_corners=True))
# The `original_image` becomes the resized image.
original_image = tf.identity(processed_image)
# Data augmentation by randomly scaling the inputs.
if is_training:
scale = preprocess_utils.get_random_scale(min_scale_factor,
max_scale_factor,
scale_factor_step_size)
processed_image, label = preprocess_utils.randomly_scale_image_and_label(
processed_image, label, scale)
processed_image.set_shape([None, None, 3])
# Pad image and label to have dimensions >= [crop_height, crop_width]
image_shape = tf.shape(processed_image)
image_height = image_shape[0]
image_width = image_shape[1]
target_height = image_height + tf.maximum(crop_height - image_height, 0)
target_width = image_width + tf.maximum(crop_width - image_width, 0)
# Pad image with mean pixel value.
mean_pixel = tf.reshape(feature_extractor.mean_pixel(model_variant),
[1, 1, 3])
processed_image = preprocess_utils.pad_to_bounding_box(
processed_image, 0, 0, target_height, target_width, mean_pixel)
if label is not None:
label = preprocess_utils.pad_to_bounding_box(label, 0, 0,
target_height,
target_width,
ignore_label)
# Randomly crop the image and label.
if is_training and label is not None:
processed_image, label = preprocess_utils.random_crop(
[processed_image, label], crop_height, crop_width)
if not is_training and label is not None:
with tf.name_scope("CentralCrop"):
offset_height = (target_height - crop_height) // 2
offset_width = (target_width - crop_width) // 2
processed_image = tf.image.crop_to_bounding_box(
processed_image, offset_height, offset_width, crop_height,
crop_width)
label = tf.image.crop_to_bounding_box(label, offset_height,
offset_width, crop_height,
crop_width)
processed_image.set_shape([crop_height, crop_width, 3])
if label is not None:
label.set_shape([crop_height, crop_width, 1])
if is_training:
# Randomly left-right flip the image and label.
processed_image, label, _ = preprocess_utils.flip_dim(
[processed_image, label], _PROB_OF_FLIP, dim=1)
if non_uniform_sampling is not None:
if non_uniform_sampling == "net":
sampling = tf.py_func(
lambda image: get_nus_predictor()(image),
[processed_image[None, ...]],
tf.float32,
name="nus_preprocess_sampling",
)
sampling = _resize_locations(sampling)
elif non_uniform_sampling == "uniform":
sampling = _nus_uniform_locations()
else:
raise Exception("Unknown non-uniform sampling type: %s" %
non_uniform_sampling)
samples = {common.IMAGE: processed_image[None, ...]}
if is_training:
samples[common.LABEL] = label[None, ...]
samples = _nus_sample(samples, sampling)
processed_image = samples[common.IMAGE][0]
if is_training:
label = samples[common.LABEL][0]
return original_image, processed_image, label, sampling[0]
if output_target_sampling:
target_sampling = _get_near_boundary_sampling_locations(
label[None, ...], ignore_label)[0]
if min_resize_value or max_resize_value:
[processed_image, label
] = preprocess_utils.resize_to_range(image=processed_image,
label=label,
min_size=min_resize_value,
max_size=max_resize_value,
factor=resize_factor,
align_corners=True)
return original_image, processed_image, label, target_sampling
return original_image, processed_image, label
def preprocess_images_and_labels_consistently(images,
labels,
crop_height,
crop_width,
min_resize_value=None,
max_resize_value=None,
resize_factor=None,
min_scale_factor=1.,
max_scale_factor=1.,
scale_factor_step_size=0,
ignore_label=255,
is_training=True,
model_variant=None):
"""Preprocesses images and labels in a consistent way.
Similar to preprocess_image_and_label, but works on a list of images
and a list of labels and uses the same crop coordinates and either flips
all images and labels or none of them.
Args:
images: List of input images.
labels: List of ground truth annotation labels.
crop_height: The height value used to crop the image and label.
crop_width: The width value used to crop the image and label.
min_resize_value: Desired size of the smaller image side.
max_resize_value: Maximum allowed size of the larger image side.
resize_factor: Resized dimensions are multiple of factor plus one.
min_scale_factor: Minimum scale factor value.
max_scale_factor: Maximum scale factor value.
scale_factor_step_size: The step size from min scale factor to max scale
factor. The input is randomly scaled based on the value of
(min_scale_factor, max_scale_factor, scale_factor_step_size).
ignore_label: The label value which will be ignored for training and
evaluation.
is_training: If the preprocessing is used for training or not.
model_variant: Model variant (string) for choosing how to mean-subtract the
images. See feature_extractor.network_map for supported model variants.
Returns:
original_images: Original images (could be resized).
processed_images: Preprocessed images.
labels: Preprocessed ground truth segmentation labels.
Raises:
ValueError: Ground truth label not provided during training.
"""
if is_training and labels is None:
raise ValueError('During training, labels must be provided.')
if model_variant is None:
tf.logging.warning('Default mean-subtraction is performed. Please specify '
'a model_variant. See feature_extractor.network_map for '
'supported model variants.')
if labels is not None:
assert len(images) == len(labels)
num_imgs = len(images)
# Keep reference to original images.
original_images = images
processed_images = [tf.cast(image, tf.float32) for image in images]
if labels is not None:
labels = [tf.cast(label, tf.int32) for label in labels]
# Resize images and labels to the desired range.
if min_resize_value is not None or max_resize_value is not None:
processed_images, labels = zip(*[
preprocess_utils.resize_to_range(
image=processed_image,
label=label,
min_size=min_resize_value,
max_size=max_resize_value,
factor=resize_factor,
align_corners=True) for processed_image, label
in zip(processed_images, labels)])
# The `original_images` becomes the resized images.
original_images = [tf.identity(processed_image)
for processed_image in processed_images]
# Data augmentation by randomly scaling the inputs.
scale = get_random_scale(
min_scale_factor, max_scale_factor, scale_factor_step_size)
processed_images, labels = zip(
*[randomly_scale_image_and_label(processed_image, label, scale)
for processed_image, label in zip(processed_images, labels)])
for processed_image in processed_images:
processed_image.set_shape([None, None, 3])
if crop_height is not None and crop_width is not None:
# Pad image and label to have dimensions >= [crop_height, crop_width].
image_shape = tf.shape(processed_images[0])
image_height = image_shape[0]
image_width = image_shape[1]
target_height = image_height + tf.maximum(crop_height - image_height, 0)
target_width = image_width + tf.maximum(crop_width - image_width, 0)
# Pad image with mean pixel value.
mean_pixel = tf.reshape(
feature_extractor.mean_pixel(model_variant), [1, 1, 3])
processed_images = [preprocess_utils.pad_to_bounding_box(
processed_image, 0, 0, target_height, target_width, mean_pixel)
for processed_image in processed_images]
if labels is not None:
labels = [preprocess_utils.pad_to_bounding_box(
label, 0, 0, target_height, target_width, ignore_label)
for label in labels]
# Randomly crop the images and labels.
if is_training and labels is not None:
cropped = preprocess_utils.random_crop(
processed_images + labels, crop_height, crop_width)
assert len(cropped) == 2 * num_imgs
processed_images = cropped[:num_imgs]
labels = cropped[num_imgs:]
for processed_image in processed_images:
processed_image.set_shape([crop_height, crop_width, 3])
if labels is not None:
for label in labels:
label.set_shape([crop_height, crop_width, 1])
if is_training:
# Randomly left-right flip the image and label.
res = preprocess_utils.flip_dim(
list(processed_images + labels), _PROB_OF_FLIP, dim=1)
maybe_flipped = res[:-1]
assert len(maybe_flipped) == 2 * num_imgs
processed_images = maybe_flipped[:num_imgs]
labels = maybe_flipped[num_imgs:]
return original_images, processed_images, labels
