# Copyright 2019 Huawei Technologies Co., Ltd
#
# 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.
# ==============================================================================
"""
The module vision.py_transforms is mainly implemented based on Python PIL, which
provides many kinds of image augmentation methods and conversion methods between
PIL image and numpy.ndarray. For users who prefer using Python PIL in computer vision
tasks, this module is a good choice to process images. Users can also self-define
their own augmentation methods with Python PIL.
"""
import numbers
import random
import numpy as np
from PIL import Image
import mindspore.dataset.transforms.py_transforms as py_transforms
from . import py_transforms_util as util
from .c_transforms import parse_padding
from .validators import check_prob, check_center_crop, check_five_crop, check_resize_interpolation, check_random_resize_crop, \
check_normalize_py, check_normalizepad_py, check_random_crop, check_random_color_adjust, check_random_rotation, \
check_ten_crop, check_num_channels, check_pad, check_rgb_to_hsv, check_hsv_to_rgb, check_alpha, \
check_random_perspective, check_random_erasing, check_cutout, check_linear_transform, check_random_affine, \
check_mix_up, check_positive_degrees, check_uniform_augment_py, check_auto_contrast, check_rgb_to_bgr, \
check_adjust_gamma
from .utils import Inter, Border
from .py_transforms_util import is_pil
DE_PY_INTER_MODE = {Inter.NEAREST: Image.NEAREST,
Inter.ANTIALIAS: Image.ANTIALIAS,
Inter.LINEAR: Image.LINEAR,
Inter.CUBIC: Image.CUBIC}
DE_PY_BORDER_TYPE = {Border.CONSTANT: 'constant',
Border.EDGE: 'edge',
Border.REFLECT: 'reflect',
Border.SYMMETRIC: 'symmetric'}
def not_random(function):
"""
Specify the function as "not random", i.e., it produces deterministic result.
A Python function can only be cached after it is specified as "not random".
"""
function.random = False
return function
[docs]class ToTensor(py_transforms.PyTensorOperation):
"""
Convert the input PIL Image or numpy.ndarray of shape (H, W, C) in the range [0, 255] to numpy.ndarray of
shape (C, H, W) in the range [0.0, 1.0] with the desired dtype.
Note:
The values in the input image will be rescaled from [0, 255] to [0.0, 1.0].
The dtype will be cast to `output_type`.
The number of channels remains the same.
Args:
output_type (numpy.dtype, optional): The dtype of the numpy.ndarray output (default=np.float32).
Raises:
TypeError: If the input is not PIL Image or numpy.ndarray.
TypeError: If the dimension of input is not 2 or 3.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> # create a list of transformations to be applied to the "image" column of each data row
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomHorizontalFlip(0.5),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
def __init__(self, output_type=np.float32):
self.output_type = output_type
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (Union[PIL Image, numpy.ndarray]): PIL Image or numpy.ndarray to be type converted.
Returns:
numpy.ndarray, converted numpy.ndarray with desired type.
"""
return util.to_tensor(img, self.output_type)
[docs]class ToType(py_transforms.PyTensorOperation):
"""
Convert the input numpy.ndarray image to the desired dtype.
Args:
output_type (numpy.dtype): The dtype of the numpy.ndarray output, e.g. numpy.float32.
Raises:
TypeError: If the input is not numpy.ndarray.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> import numpy as np
>>> transforms_list =Compose([py_vision.Decode(),
... py_vision.RandomHorizontalFlip(0.5),
... py_vision.ToTensor(),
... py_vision.ToType(np.float32)])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
def __init__(self, output_type):
self.output_type = output_type
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (numpy.ndarray): numpy.ndarray to be dtype converted.
Returns:
numpy.ndarray, converted numpy.ndarray with desired dtype.
"""
return util.to_type(img, self.output_type)
[docs]class HWC2CHW(py_transforms.PyTensorOperation):
"""
Transpose the input numpy.ndarray image of shape (H, W, C) to (C, H, W).
Raises:
TypeError: If the input is not numpy.ndarray.
TypeError: If the dimension of input is not 3.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.HWC2CHW()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
def __init__(self):
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (numpy.ndarray): numpy.ndarray of shape (H, W, C) to be transposed.
Returns:
numpy.ndarray, transposed numpy.ndarray of shape (C, H, W).
"""
return util.hwc_to_chw(img)
[docs]class ToPIL(py_transforms.PyTensorOperation):
"""
Convert the input decoded numpy.ndarray image to PIL Image.
Note:
The conversion mode will be determined from type according to `PIL.Image.fromarray`.
Raises:
TypeError: If the input is not numpy.ndarray or PIL Image.
Supported Platforms:
``CPU``
Examples:
>>> # data is already decoded, but not in PIL Image format
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.ToPIL(),
... py_vision.RandomHorizontalFlip(0.5),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
def __init__(self):
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (numpy.ndarray): Decoded numpy.ndarray image to be converted to PIL Image.
Returns:
PIL Image, converted PIL Image.
"""
return util.to_pil(img)
[docs]class Decode(py_transforms.PyTensorOperation):
"""
Decode the input raw image to PIL Image format in RGB mode.
Raises:
ValueError: If the input is not raw data.
ValueError: If the input image is already decoded.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomHorizontalFlip(0.5),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
def __init__(self):
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (Bytes-like Object): Raw image data to be decoded.
Returns:
PIL Image, decoded PIL Image in RGB mode.
"""
return util.decode(img)
[docs]class Normalize(py_transforms.PyTensorOperation):
r"""
Normalize the input numpy.ndarray image of shape (C, H, W) with the specified mean and standard deviation.
.. math::
output_{c} = \frac{input_{c} - mean_{c}}{std_{c}}
Note:
The values of the input image need to be in the range [0.0, 1.0]. If not so, call `ToTensor` first.
Args:
mean (Union[float, sequence]): list or tuple of mean values for each channel, arranged in channel order. The
values must be in the range [0.0, 1.0].
If a single float is provided, it will be filled to the same length as the channel.
std (Union[float, sequence]): list or tuple of standard deviation values for each channel, arranged in channel
order. The values must be in the range (0.0, 1.0].
If a single float is provided, it will be filled to the same length as the channel.
Raises:
TypeError: If the input is not numpy.ndarray.
TypeError: If the dimension of input is not 3.
NotImplementedError: If the dtype of input is a subdtype of np.integer.
ValueError: If the lengths of the mean and std are not equal.
ValueError: If the length of the mean or std is neither equal to the channel length nor 1.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomHorizontalFlip(0.5),
... py_vision.ToTensor(),
... py_vision.Normalize((0.491, 0.482, 0.447), (0.247, 0.243, 0.262))])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_normalize_py
def __init__(self, mean, std):
self.mean = mean
self.std = std
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (numpy.ndarray): numpy.ndarray to be normalized.
Returns:
numpy.ndarray, normalized numpy.ndarray.
"""
return util.normalize(img, self.mean, self.std)
[docs]class NormalizePad(py_transforms.PyTensorOperation):
r"""
Normalize the input numpy.ndarray image of shape (C, H, W) with the specified mean and standard deviation,
then pad an extra channel filled with zeros.
.. math::
output_{c} = \begin{cases}
\frac{input_{c} - mean_{c}}{std_{c}}, & \text{if} \quad 0 \le c < 3 \text{;}\\
0, & \text{if} \quad c = 3 \text{.}
\end{cases}
Note:
The values of the input image need to be in the range [0.0, 1.0]. If not so, call `ToTensor` first.
Args:
mean (Union[float, sequence]): list or tuple of mean values for each channel, arranged in channel order. The
values must be in the range [0.0, 1.0].
If a single float is provided, it will be filled to the same length as the channel.
std (Union[float, sequence]): list or tuple of standard deviation values for each channel, arranged in channel
order. The values must be in the range (0.0, 1.0].
If a single float is provided, it will be filled to the same length as the channel.
dtype (str): The dtype of the numpy.ndarray output when `pad_channel` is set True. Only "float32" and "float16"
are supported (default="float32").
Raises:
TypeError: If the input is not numpy.ndarray.
TypeError: If the dimension of input is not 3.
NotImplementedError: If the dtype of input is a subdtype of np.integer.
ValueError: If the length of the mean and std are not equal.
ValueError: If the length of the mean or std is neither equal to the channel length nor 1.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomHorizontalFlip(0.5),
... py_vision.ToTensor(),
... py_vision.NormalizePad((0.491, 0.482, 0.447), (0.247, 0.243, 0.262), "float32")])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_normalizepad_py
def __init__(self, mean, std, dtype="float32"):
self.mean = mean
self.std = std
self.dtype = dtype
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (numpy.ndarray): numpy.ndarray to be normalized and padded.
Returns:
numpy.ndarray, normalized and padded numpy.ndarray.
"""
return util.normalize(img, self.mean, self.std, pad_channel=True, dtype=self.dtype)
[docs]class RandomCrop(py_transforms.PyTensorOperation):
"""
Crop the input PIL Image at a random location with the specified size.
Args:
size (Union[int, sequence]): The output size of the cropped image.
If size is an integer, a square of size (size, size) is returned.
If size is a sequence of length 2, it should be in shape of (height, width).
padding (Union[int, sequence], optional): Padding on each border of the image (default=None).
If padding is not None, pad the image before cropping.
If a single number is provided, pad all borders with this value.
If a sequence of length 2 is provided, pad the left/top border
with the first value and right/bottom border with the second value.
If a sequence of length 4 is provided, pad the left, top, right and bottom borders respectively.
pad_if_needed (bool, optional): Pad the image if either side is smaller than
the given output size (default=False).
fill_value (Union[int, tuple], optional): Pixel fill value to pad the borders when padding_mode is
Border.CONSTANT (default=0). If a tuple of length 3 is provided, it is used to fill R, G, B
channels respectively.
padding_mode (Border, optional): The method of padding (default=Border.CONSTANT). It can be any of
[Border.CONSTANT, Border.EDGE, Border.REFLECT, Border.SYMMETRIC].
- Border.CONSTANT, means to pad with given constant values.
- Border.EDGE, means to pad with the last value at the edge.
- Border.REFLECT, means to pad with reflection of image omitting the last value at the edge.
- Border.SYMMETRIC, means to pad with reflection of image repeating the last value at the edge.
Raises:
TypeError: If `size` is not of type integer or sequence of integer.
TypeError: If `padding` is not of type integer or sequence of integer.
TypeError: If `pad_if_needed` is not of type boolean.
TypeError: If `fill_value` is not of type integer or sequence of integer.
TypeError: If `padding_mode` is not of type Border.
ValueError: If `size` is not positive.
ValueError: If `padding` is negative.
ValueError: If `fill_value` is not in range [0, 255].
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomCrop(224),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_random_crop
def __init__(self, size, padding=None, pad_if_needed=False, fill_value=0, padding_mode=Border.CONSTANT):
if padding is None:
padding = (0, 0, 0, 0)
else:
padding = parse_padding(padding)
self.size = size
self.padding = padding
self.pad_if_needed = pad_if_needed
self.fill_value = fill_value
self.padding_mode = DE_PY_BORDER_TYPE[padding_mode]
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be randomly cropped.
Returns:
PIL Image, cropped image.
"""
return util.random_crop(img, self.size, self.padding, self.pad_if_needed,
self.fill_value, self.padding_mode)
[docs]class RandomHorizontalFlip(py_transforms.PyTensorOperation):
"""
Randomly flip the input image horizontally with a given probability.
Args:
prob (float, optional): Probability of the image to be horizontally flipped (default=0.5).
Raises:
TypeError: If `prob` is not of type float.
ValueError: If `prob` is not in range [0, 1].
RuntimeError: If given tensor shape is not <H, W> or <H, W, C>.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomHorizontalFlip(0.5),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_prob
def __init__(self, prob=0.5):
self.prob = prob
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be horizontally flipped.
Returns:
PIL Image, randomly horizontally flipped image.
"""
return util.random_horizontal_flip(img, self.prob)
[docs]class RandomVerticalFlip(py_transforms.PyTensorOperation):
"""
Randomly flip the input image vertically with a given probability.
Args:
prob (float, optional): Probability of the image to be vertically flipped (default=0.5).
Raises:
TypeError: If `prob` is not of type float.
ValueError: If `prob` is not in range [0, 1].
RuntimeError: If given tensor shape is not <H, W> or <H, W, C>.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomVerticalFlip(0.5),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_prob
def __init__(self, prob=0.5):
self.prob = prob
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be vertically flipped.
Returns:
PIL Image, randomly vertically flipped image.
"""
return util.random_vertical_flip(img, self.prob)
[docs]class Resize(py_transforms.PyTensorOperation):
"""
Resize the input PIL Image to the given size.
Args:
size (Union[int, sequence]): The output size of the image.
If size is an integer, the smaller edge of the image will be resized to this
value, keeping the image aspect ratio the same.
If size is a sequence of length 2, it should be in shape of (height, width).
interpolation (Inter, optional): Image interpolation mode (default=Inter.BILINEAR).
It can be any of [Inter.NEAREST, Inter.ANTIALIAS, Inter.BILINEAR, Inter.BICUBIC].
- Inter.NEAREST, nearest-neighbor interpolation.
- Inter.ANTIALIAS, antialias interpolation.
- Inter.BILINEAR, bilinear interpolation.
- Inter.BICUBIC, bicubic interpolation.
Raises:
TypeError: If `size` is not of type integer or sequence of integer.
TypeError: If `interpolation` is not of type Inter.
ValueError: If `size` is not positive.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.Resize(256),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_resize_interpolation
def __init__(self, size, interpolation=Inter.BILINEAR):
self.size = size
self.interpolation = DE_PY_INTER_MODE[interpolation]
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be resized.
Returns:
PIL Image, resized image.
"""
return util.resize(img, self.size, self.interpolation)
[docs]class RandomResizedCrop(py_transforms.PyTensorOperation):
"""
Randomly crop the image and resize it to a given size.
Args:
size (Union[int, sequence]): The size of the output image.
If size is an integer, a square of size (size, size) is returned.
If size is a sequence of length 2, it should be in shape of (height, width).
scale (Union[list, tuple], optional): Respective size range of the original image to be cropped
in shape of (min, max) (default=(0.08, 1.0)).
ratio (Union[list, tuple], optional): Aspect ratio range to be cropped
in shape of (min, max) (default=(3./4., 4./3.)).
interpolation (Inter, optional): Image interpolation mode (default=Inter.BILINEAR).
It can be any of [Inter.NEAREST, Inter.ANTIALIAS, Inter.BILINEAR, Inter.BICUBIC].
- Inter.NEAREST, nearest-neighbor interpolation.
- Inter.ANTIALIAS, antialias interpolation.
- Inter.BILINEAR, bilinear interpolation.
- Inter.BICUBIC, bicubic interpolation.
max_attempts (int, optional): The maximum number of attempts to propose a valid
crop area (default=10). If exceeded, fall back to use center crop instead.
Raises:
TypeError: If `size` is not of type integer or sequence of integer.
TypeError: If `scale` is not of type tuple.
TypeError: If `ratio` is not of type tuple.
TypeError: If `interpolation` is not of type Inter.
TypeError: If `max_attempts` is not of type integer.
ValueError: If `size` is not positive.
ValueError: If `scale` is negative.
ValueError: If `ratio` is negative.
ValueError: If `max_attempts` is not positive.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomResizedCrop(224),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_random_resize_crop
def __init__(self, size, scale=(0.08, 1.0), ratio=(3. / 4., 4. / 3.),
interpolation=Inter.BILINEAR, max_attempts=10):
self.size = size
self.scale = scale
self.ratio = ratio
self.interpolation = DE_PY_INTER_MODE[interpolation]
self.max_attempts = max_attempts
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be randomly cropped and resized.
Returns:
PIL Image, randomly cropped and resized image.
"""
return util.random_resize_crop(img, self.size, self.scale, self.ratio,
self.interpolation, self.max_attempts)
[docs]class CenterCrop(py_transforms.PyTensorOperation):
"""
Crop the central region of the input PIL Image with the given size.
Args:
size (Union[int, sequence]): The output size of the cropped image.
If size is an integer, a square of size (size, size) is returned.
If size is a sequence of length 2, it should be in shape of (height, width).
Raises:
TypeError: If `size` is not of type integer or sequence.
ValueError: If `size` is less than or equal to 0.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.CenterCrop(64),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_center_crop
def __init__(self, size):
self.size = size
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be center cropped.
Returns:
PIL Image, cropped image.
"""
return util.center_crop(img, self.size)
[docs]class RandomColorAdjust(py_transforms.PyTensorOperation):
"""
Randomly adjust the brightness, contrast, saturation, and hue of the input PIL Image.
Args:
brightness (Union[float, tuple], optional): Brightness adjustment factor,
which must be non negative (default=(1, 1)).
If brightness is a float, the factor is uniformly chosen in range of [max(0, 1-brightness), 1+brightness].
If brightness is a sequence of length 2, it should be in shape of [min, max].
contrast (Union[float, tuple], optional): Contrast adjustment factor,
which must be non negative (default=(1, 1)).
If contrast is a float, the factor is uniformly chosen in range of [max(0, 1-contrast), 1+contrast].
If contrast is a sequence of length 2, it should be in shape of [min, max].
saturation (Union[float, tuple], optional): Saturation adjustment factor,
which must be non negative(default=(1, 1)).
If saturation is a float, the factor is uniformly chosen in range of [max(0, 1-saturation), 1+saturation].
If saturation is a sequence of length 2, it should be in shape of [min, max].
hue (Union[float, tuple], optional): Hue adjustment factor (default=(0, 0)).
If hue is a float, the range will be [-hue, hue], where 0 <= hue <= 0.5.
If hue is a sequence of length 2, it should be in shape of [min, max], where -0.5 <= min <= max <= 0.5.
Raises:
TypeError: If `brightness` is not of type float or sequence of float.
TypeError: If `contrast` is not of type float or sequence of float.
TypeError: If `saturation` is not of type float or sequence of float.
TypeError: If `hue` is not of type float or sequence of float.
ValueError: If `brightness` is negative.
ValueError: If `contrast` is negative.
ValueError: If `saturation` is negative.
ValueError: If `hue` is not in range [-0.5, 0.5].
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomColorAdjust(0.4, 0.4, 0.4, 0.1),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_random_color_adjust
def __init__(self, brightness=(1, 1), contrast=(1, 1), saturation=(1, 1), hue=(0, 0)):
self.brightness = brightness
self.contrast = contrast
self.saturation = saturation
self.hue = hue
def __call__(self, img):
"""
Call method.
Args:
img (PIL image): Image to be randomly color adjusted.
Returns:
PIL Image, randomly color adjusted image.
"""
return util.random_color_adjust(img, self.brightness, self.contrast, self.saturation, self.hue)
[docs]class RandomRotation(py_transforms.PyTensorOperation):
"""
Rotate the input PIL Image by a random angle.
Note:
See https://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.Image.rotate.
Args:
degrees (Union[int, float, sequence]): Range of random rotation degrees.
If `degrees` is a number, the range will be converted to (-degrees, degrees).
If `degrees` is a sequence of length 2, it should be in shape of (min, max).
resample (Inter, optional): An optional resampling filter (default=Inter.NEAREST).
If the image is in mode of "1" or "P", it is set to Inter.NEAREST by default.
It can be any of [Inter.NEAREST, Inter.ANTIALIAS, Inter.BILINEAR, Inter.BICUBIC].
- Inter.NEAREST, nearest-neighbor interpolation.
- Inter.ANTIALIAS, antialias interpolation.
- Inter.BILINEAR, bilinear interpolation.
- Inter.BICUBIC, bicubic interpolation.
expand (bool, optional): Optional expansion flag (default=False).
If set to True, expand the output image to make it large enough to hold the entire rotated image.
If set to False, keep the output image the same size as the input.
Note that the expand flag assumes rotation around the center and no translation.
center (tuple, optional): Optional center of rotation, which must be a tuple of length 2 (default=None).
Origin is the top left corner. Default None means to set the center of the image.
fill_value (int or tuple, optional): Pixel fill value for the area outside the rotated image (default=0).
If fill_value is a tuple of length 3, it is used to fill R, G, B channels respectively.
If fill_value is an integer, it is used to fill all RGB channels.
Raises:
TypeError: If `degrees` is not of type integer, float or sequence.
TypeError: If `resample` is not of type Inter.
TypeError: If `expand` is not of type boolean.
TypeError: If `center` is not of type tuple.
TypeError: If `fill_value` is not of type integer or tuple of integer.
ValueError: If `fill_value` is not in range [0, 255].
RuntimeError: If given tensor shape is not <H, W> or <H, W, C>.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomRotation(30),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_random_rotation
def __init__(self, degrees, resample=Inter.NEAREST, expand=False, center=None, fill_value=0):
self.degrees = degrees
self.resample = DE_PY_INTER_MODE[resample]
self.expand = expand
self.center = center
self.fill_value = fill_value
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be randomly rotated.
Returns:
PIL Image, randomly rotated image.
"""
return util.random_rotation(img, self.degrees, self.resample, self.expand, self.center, self.fill_value)
[docs]class FiveCrop(py_transforms.PyTensorOperation):
"""
Crop the given image into one central crop and four corners.
Args:
size (Union[int, sequence]): The output size of the cropped images.
If size is an integer, a square of size (size, size) is returned.
If size is a sequence of length 2, it should be in shape of (height, width).
Raises:
TypeError: If `size` is not of type integer or sequence of integer.
ValueError: If `size` is not positive.
Supported Platforms:
``CPU``
Examples:
>>> import numpy
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.FiveCrop(size=200),
... # 4D stack of 5 images
... lambda *images: numpy.stack([py_vision.ToTensor()(image) for image in images])])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_five_crop
def __init__(self, size):
self.size = size
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be cropped.
Returns:
tuple, a tuple of five PIL Image in order of top_left, top_right, bottom_left, bottom_right, center.
"""
return util.five_crop(img, self.size)
[docs]class TenCrop(py_transforms.PyTensorOperation):
"""
Crop the given image into one central crop and four corners plus the flipped version of these.
Args:
size (Union[int, sequence]): The output size of the cropped images.
If size is an integer, a square of size (size, size) is returned.
If size is a sequence of length 2, it should be in shape of (height, width).
use_vertical_flip (bool, optional): Whether to flip the image vertically,
otherwise horizontally (default=False).
Raises:
TypeError: If `size` is not of type integer or sequence of integer.
TypeError: If `use_vertical_flip` is not of type boolean.
ValueError: If `size` is not positive.
Supported Platforms:
``CPU``
Examples:
>>> import numpy
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.TenCrop(size=200),
... # 4D stack of 10 images
... lambda *images: numpy.stack([py_vision.ToTensor()(image) for image in images])])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_ten_crop
def __init__(self, size, use_vertical_flip=False):
if isinstance(size, int):
size = (size, size)
self.size = size
self.use_vertical_flip = use_vertical_flip
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be cropped.
Returns:
tuple, a tuple of 10 PIL Image, in order of top_left, top_right, bottom_left, bottom_right, center
of the original image and top_left, top_right, bottom_left, bottom_right, center of the flipped image.
"""
return util.ten_crop(img, self.size, self.use_vertical_flip)
[docs]class Grayscale(py_transforms.PyTensorOperation):
"""
Convert the input PIL Image to grayscale.
Args:
num_output_channels (int): Number of channels of the output grayscale image, which can be 1 or 3 (default=1).
If num_output_channels is 3, the returned image will have 3 identical RGB channels.
Raises:
TypeError: If `num_output_channels` is not of type integer.
ValueError: If `num_output_channels` is not 1 or 3.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.Grayscale(3),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_num_channels
def __init__(self, num_output_channels=1):
self.num_output_channels = num_output_channels
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be converted to grayscale.
Returns:
PIL Image, converted grayscale image.
"""
return util.grayscale(img, num_output_channels=self.num_output_channels)
[docs]class RandomGrayscale(py_transforms.PyTensorOperation):
"""
Randomly convert the input image into grayscale with a given probability.
Args:
prob (float, optional): Probability of the image being converted to grayscale (default=0.1).
Raises:
TypeError: If `prob` is not of type float.
ValueError: If `prob` is not in range [0, 1].
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomGrayscale(0.3),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_prob
def __init__(self, prob=0.1):
self.prob = prob
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be randomly converted to grayscale.
Returns:
PIL Image, randomly converted grayscale image, which has the same number of channels as the input image.
If input image has 1 channel, the output grayscale image will have 1 channel.
If input image has 3 channels, the output grayscale image will have 3 identical channels.
"""
if img.mode == 'L':
num_output_channels = 1
else:
num_output_channels = 3
if self.prob > random.random():
return util.grayscale(img, num_output_channels=num_output_channels)
return img
[docs]class Pad(py_transforms.PyTensorOperation):
"""
Pad the input image on all sides with the given padding parameters.
Args:
padding (Union[int, sequence]): The number of pixels padded on the image borders.
If a single number is provided, pad all borders with this value.
If a sequence of length 2 is provided, pad the left and top with the
first value and the right and bottom with the second value.
If a sequence of length 4 is provided, pad the left, top, right and bottom respectively.
fill_value (Union[int, tuple], optional): Pixel fill value to pad the borders,
only valid when padding_mode is Border.CONSTANT (default=0).
If fill_value is an integer, it is used for all RGB channels.
If fill_value is a tuple of length 3, it is used to fill R, G, B channels respectively.
padding_mode (Border, optional): The method of padding (default=Border.CONSTANT).
It can be any of [Border.CONSTANT, Border.EDGE, Border.REFLECT, Border.SYMMETRIC].
- Border.CONSTANT, pads with a constant value.
- Border.EDGE, pads with the last value at the edge of the image.
- Border.REFLECT, pads with reflection of the image omitting the last value on the edge.
- Border.SYMMETRIC, pads with reflection of the image repeating the last value on the edge.
Raises:
TypeError: If `padding` is not of type integer or sequence of integer.
TypeError: If `fill_value` is not of type integer or tuple of integer.
TypeError: If `padding_mode` is not of type Border.
ValueError: If `padding` is negative.
ValueError: If `fill_value` is not in range [0, 255].
RuntimeError: If given tensor shape is not <H, W> or <H, W, C>.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... # adds 10 pixels (default black) to each border of the image
... py_vision.Pad(padding=10),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_pad
def __init__(self, padding, fill_value=0, padding_mode=Border.CONSTANT):
parse_padding(padding)
self.padding = padding
self.fill_value = fill_value
self.padding_mode = DE_PY_BORDER_TYPE[padding_mode]
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be padded.
Returns:
PIL Image, padded image.
"""
return util.pad(img, self.padding, self.fill_value, self.padding_mode)
[docs]class RandomPerspective(py_transforms.PyTensorOperation):
"""
Randomly apply perspective transformation to the input PIL Image with a given probability.
Args:
distortion_scale (float, optional): The scale of distortion, in range of [0, 1] (default=0.5).
prob (float, optional): Probability of the image being applied perspective transformation (default=0.5).
interpolation (Inter, optional): Image interpolation mode (default=Inter.BICUBIC).
It can be any of [Inter.BILINEAR, Inter.NEAREST, Inter.BICUBIC].
- Inter.BILINEAR, bilinear interpolation.
- Inter.NEAREST, nearest-neighbor interpolation.
- Inter.BICUBIC, bicubic interpolation.
Raises:
TypeError: If `distortion_scale` is not of type float.
TypeError: If `prob` is not of type float.
TypeError: If `interpolation` is not of type Inter.
ValueError: If `distortion_scale` is not in range [0, 1].
ValueError: If `prob` is not in range [0, 1].
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomPerspective(prob=0.1),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_random_perspective
def __init__(self, distortion_scale=0.5, prob=0.5, interpolation=Inter.BICUBIC):
self.distortion_scale = distortion_scale
self.prob = prob
self.interpolation = DE_PY_INTER_MODE[interpolation]
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be applied randomly perspective transformation.
Returns:
PIL Image, image applied randomly perspective transformation.
"""
if not is_pil(img):
raise ValueError("Input image should be a Pillow image.")
if self.prob > random.random():
start_points, end_points = util.get_perspective_params(
img, self.distortion_scale)
return util.perspective(img, start_points, end_points, self.interpolation)
return img
[docs]class RandomErasing(py_transforms.PyTensorOperation):
"""
Randomly erase the pixels within a random selected rectangle region with a given probability.
See Zhun Zhong et al. 'Random Erasing Data Augmentation' 2017 on https://arxiv.org/pdf/1708.04896.pdf
Args:
prob (float, optional): Probability of the image being randomly erased (default=0.5).
scale (sequence of floats, optional): Range of the relative erase area to the
original image (default=(0.02, 0.33)).
ratio (sequence, optional): Range of aspect ratio of the erased area (default=(0.3, 3.3)).
value (Union[int, sequence, str]): Erasing value (default=0).
If value is a single integer, it is used to erase all pixels.
If value is a sequence of length 3, it is used to erase R, G, B channels respectively.
If value is a string of 'random', each pixel will be erased with a random value obtained
from a standard normal distribution.
inplace (bool, optional): Whether to apply this transformation inplace (default=False).
max_attempts (int, optional): The maximum number of attempts to propose a valid
area to be erased (default=10). If exceeded, return the original image.
Raises:
TypeError: If `prob` is not of type float.
TypeError: If `scale` is not of type sequence.
TypeError: If `ratio` is not of type sequence.
TypeError: If `value` is not of type integer, sequence or string.
TypeError: If `inplace` is not of type boolean.
TypeError: If `max_attempts` is not of type integer.
ValueError: If `prob` is not in range [0, 1].
ValueError: If `scale` is negative.
ValueError: If `ratio` is negative.
ValueError: If `value` is not in range [0, 255].
ValueError: If `max_attempts` is not positive.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.ToTensor(),
... py_vision.RandomErasing(value='random')])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_random_erasing
def __init__(self, prob=0.5, scale=(0.02, 0.33), ratio=(0.3, 3.3), value=0, inplace=False, max_attempts=10):
self.prob = prob
self.scale = scale
self.ratio = ratio
self.value = value
self.inplace = inplace
self.max_attempts = max_attempts
def __call__(self, np_img):
"""
Call method.
Args:
np_img (numpy.ndarray): image in shape of (C, H, W) to be randomly erased.
Returns:
numpy.ndarray, erased image.
"""
bounded = True
if self.prob > random.random():
i, j, erase_h, erase_w, erase_value = util.get_erase_params(np_img, self.scale, self.ratio,
self.value, bounded, self.max_attempts)
return util.erase(np_img, i, j, erase_h, erase_w, erase_value, self.inplace)
return np_img
[docs]class Cutout(py_transforms.PyTensorOperation):
"""
Randomly apply a given number of square patches of zeros to a location within the input
numpy.ndarray image of shape (C, H, W).
See Terrance DeVries and Graham W. Taylor 'Improved Regularization of Convolutional Neural Networks with Cutout'
2017 on https://arxiv.org/pdf/1708.04552.pdf
Args:
length (int): The side length of each square patch.
num_patches (int, optional): Number of patches to be applied to the image (default=1).
Raises:
TypeError: If `length` is not of type integer.
TypeError: If `num_patches` is not of type integer.
ValueError: If `length` is less than or equal 0.
ValueError: If `num_patches` is less than or equal 0.
RuntimeError: If given tensor shape is not <H, W, C>.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.ToTensor(),
... py_vision.Cutout(80)])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_cutout
def __init__(self, length, num_patches=1):
self.length = length
self.num_patches = num_patches
self.random = False
def __call__(self, np_img):
"""
Call method.
Args:
np_img (numpy.ndarray): Image in shape of (C, H, W) to be cut out.
Returns:
numpy.ndarray, image cut out.
"""
if not isinstance(np_img, np.ndarray):
raise TypeError(
"img should be NumPy array. Got {}.".format(type(np_img)))
if np_img.ndim != 3:
raise TypeError(
'img dimension should be 3. Got {}.'.format(np_img.ndim))
_, image_h, image_w = np_img.shape
scale = (self.length * self.length) / (image_h * image_w)
bounded = False
for _ in range(self.num_patches):
i, j, erase_h, erase_w, erase_value = util.get_erase_params(np_img, (scale, scale), (1, 1), 0, bounded,
1)
np_img = util.erase(np_img, i, j, erase_h, erase_w, erase_value)
return np_img
[docs]class RandomAffine(py_transforms.PyTensorOperation):
"""
Apply random affine transformation to the input PIL Image.
Args:
degrees (Union[int, float, sequence]): Range of degrees to select from.
If `degrees` is a number, the range will be (-degrees, degrees).
If `degrees` is a sequence, it should be in shape of (min, max).
translate (sequence, optional): Maximum absolute fraction sequence in shape of (tx, ty)
for horizontal and vertical translations. The horizontal and vertical shifts are randomly
selected in the range (-tx * width, tx * width) and (-ty * height, ty * height) respectively.
(default=None, no translation will be applied).
scale (sequence, optional): Scaling factor interval (default=None, keep original scale).
shear (Union[int, float, sequence], optional): Range of shear factor to select from.
If shear is an integer, a shear parallel to the X axis in the range (-shear, shear) will be applied.
If shear is a sequence of length 2, a shear parallel to the X axis in the range (shear[0], shear[1])
will be applied.
If shear is a sequence of length 4, a shear parallel to the X axis in the range (shear[0], shear[1])
and a shear parallel to the Y axis in the range (shear[2], shear[3]) will be applied.
(default=None, no shear will be applied).
resample (Inter, optional): An optional resampling filter (default=Inter.NEAREST).
If the PIL Image is in mode of "1" or "P", it is set to Inter.NEAREST by default.
It can be any of [Inter.BILINEAR, Inter.NEAREST, Inter.BICUBIC].
- Inter.BILINEAR, bilinear interpolation.
- Inter.NEAREST, nearest-neighbor interpolation.
- Inter.BICUBIC, bicubic interpolation.
fill_value (Union[int, tuple], optional): Pixel fill value for the area outside the
transformed image (default=0).
If fill_value is an integer, it is used for all RGB channels.
If fill_value is a tuple of length 3, it is used to fill R, G, B channels respectively.
Only supported with Pillow version > 5.0.0.
Raises:
TypeError: If `degrees` is not of type integer, float or sequence.
TypeError: If `translate` is not of type sequence.
TypeError: If `scale` is not of type sequence.
TypeError: If `shear` is not of type integer, float or sequence.
TypeError: If `resample` is not of type Inter.
TypeError: If `fill_value` is not of type integer or tuple of integer.
ValueError: If `degrees` is negative.
ValueError: If `translate` is not in range [-1.0, 1.0].
ValueError: If `scale` is negative.
ValueError: If `shear` is not positive.
RuntimeError: If given tensor shape is not <H, W> or <H, W, C>.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomAffine(degrees=15, translate=(0.1, 0.1), scale=(0.9, 1.1)),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_random_affine
def __init__(self, degrees, translate=None, scale=None, shear=None, resample=Inter.NEAREST, fill_value=0):
if shear is not None:
if isinstance(shear, numbers.Number):
shear = (-1 * shear, shear)
else:
if len(shear) == 2:
shear = [shear[0], shear[1], 0., 0.]
elif len(shear) == 4:
shear = [s for s in shear]
if isinstance(degrees, numbers.Number):
degrees = (-degrees, degrees)
self.degrees = degrees
self.translate = translate
self.scale_ranges = scale
self.shear = shear
self.resample = DE_PY_INTER_MODE[resample]
self.fill_value = fill_value
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be randomly affine transformed.
Returns:
PIL Image, randomly affine transformed image.
"""
return util.random_affine(img,
self.degrees,
self.translate,
self.scale_ranges,
self.shear,
self.resample,
self.fill_value)
[docs]class MixUp(py_transforms.PyTensorOperation):
"""
Randomly mix up a batch of images together with its labels. Each image will be multiplied by a random
weight lambda generated from the beta distribution and then added to another image multiplied by 1 - lambda.
The same transformation will be applied to their labels with the same value of lambda. Make sure that the
labels are one hot encoded in advance.
Args:
batch_size (int): The number of images in a batch.
alpha (float): The alpha and beta parameter in the beta distribution.
is_single (bool, optional): If True, it will randomly mix up [img(0), ..., img(n-1), img(n)] with
[img1, ..., img(n), img0] in each batch. Otherwise, it will randomly mix up images with the
output of mixing of previous batch of images (Default=True).
Raises:
TypeError: If `batch_size` is not of type integer.
TypeError: If `alpha` is not of type float.
TypeError: If `is_single` is not of type boolean.
ValueError: If `batch_size` is not positive.
ValueError: If `alpha` is not positive.
Supported Platforms:
``CPU``
Examples:
>>> # Setup multi-batch mixup transformation
>>> transform = [py_vision.MixUp(batch_size=16, alpha=0.2, is_single=False)]
>>> # Apply the transform to the dataset through dataset.map()
>>> image_folder_dataset = image_folder_dataset.map(input_columns="image",
... operations=transform)
"""
@check_mix_up
def __init__(self, batch_size, alpha, is_single=True):
self.image = 0
self.label = 0
self.is_first = True
self.batch_size = batch_size
self.alpha = alpha
self.is_single = is_single
self.random = False
def __call__(self, image, label):
"""
Call method.
Args:
image (numpy.ndarray): Images to be mixed up.
label (numpy.ndarray): Labels to be mixed up.
Returns:
numpy.ndarray, images after mixing up.
numpy.ndarray, labels after mixing up.
"""
if self.is_single:
return util.mix_up_single(self.batch_size, image, label, self.alpha)
return util.mix_up_muti(self, self.batch_size, image, label, self.alpha)
class RgbToBgr(py_transforms.PyTensorOperation):
"""
Convert one or more numpy.ndarray images from RGB to BGR.
Args:
is_hwc (bool): Whether the image is in shape of (H, W, C) or (N, H, W, C), otherwise
in shape of (C, H, W) or (N, C, H, W) (default=False).
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.CenterCrop(20),
... py_vision.ToTensor(),
... py_vision.RgbToBgr()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_rgb_to_bgr
def __init__(self, is_hwc=False):
self.is_hwc = is_hwc
self.random = False
def __call__(self, rgb_imgs):
"""
Call method.
Args:
rgb_imgs (numpy.ndarray): RGB images to be converted.
Returns:
numpy.ndarray, converted BGR images.
"""
return util.rgb_to_bgrs(rgb_imgs, self.is_hwc)
[docs]class RgbToHsv(py_transforms.PyTensorOperation):
"""
Convert one or more numpy.ndarray images from RGB to HSV.
Args:
is_hwc (bool): Whether the image is in shape of (H, W, C) or (N, H, W, C), otherwise
in shape of (C, H, W) or (N, C, H, W) (default=False).
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.CenterCrop(20),
... py_vision.ToTensor(),
... py_vision.RgbToHsv()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_rgb_to_hsv
def __init__(self, is_hwc=False):
self.is_hwc = is_hwc
self.random = False
def __call__(self, rgb_imgs):
"""
Call method.
Args:
rgb_imgs (numpy.ndarray): RGB images to be converted.
Returns:
numpy.ndarray, converted HSV images.
"""
return util.rgb_to_hsvs(rgb_imgs, self.is_hwc)
[docs]class HsvToRgb(py_transforms.PyTensorOperation):
"""
Convert one or more numpy.ndarray images from HSV to RGB.
Args:
is_hwc (bool): Whether the image is in shape of (H, W, C) or (N, H, W, C), otherwise
in shape of (C, H, W) or (N, C, H, W) (default=False).
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.CenterCrop(20),
... py_vision.ToTensor(),
... py_vision.HsvToRgb()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_hsv_to_rgb
def __init__(self, is_hwc=False):
self.is_hwc = is_hwc
self.random = False
def __call__(self, hsv_imgs):
"""
Call method.
Args:
hsv_imgs (numpy.ndarray): HSV images to be converted.
Returns:
numpy.ndarray, converted RGB images.
"""
return util.hsv_to_rgbs(hsv_imgs, self.is_hwc)
[docs]class RandomColor(py_transforms.PyTensorOperation):
"""
Adjust the color balance of the input PIL Image by a random degree.
Args:
degrees (sequence): Range of color adjustment degree to be randomly chosen from,
which should be in shape of (min, max) (default=(0.1,1.9)).
Raises:
TypeError: If `degrees` is not of type sequence of float.
ValueError: If `degrees` is negative.
RuntimeError: If given tensor shape is not <H, W, C>.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomColor((0.5, 2.0)),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_positive_degrees
def __init__(self, degrees=(0.1, 1.9)):
self.degrees = degrees
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be color adjusted.
Returns:
PIL Image, color adjusted image.
"""
return util.random_color(img, self.degrees)
class RandomLighting:
"""
Add AlexNet-style PCA-based noise to an image.
Args:
alpha (float, optional): Intensity of the image (default=0.05).
Raises:
TypeError: If `alpha` is not of type float.
ValueError: If `alpha` is negative.
RuntimeError: If given tensor shape is not <H, W, C>.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>>
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomLighting(0.1),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_alpha
def __init__(self, alpha=0.05):
self.alpha = alpha
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be added AlexNet-style PCA-based noise.
Returns:
PIL Image, image with noise added.
"""
return util.random_lighting(img, self.alpha)
[docs]class RandomSharpness(py_transforms.PyTensorOperation):
"""
Adjust the sharpness of the input PIL Image by a random degree.
Args:
degrees (sequence): Range of sharpness adjustment degree to be randomly chosen from, which
should be in shape of (min, max) (default=(0.1,1.9)).
Degree of 0.0 gives a blurred image, degree of 1.0 gives the original image,
and degree of 2.0 increases the sharpness by a factor of 2.
Raises:
TypeError : If `degrees` is not a list or a tuple.
ValueError: If `degrees` is negative.
ValueError: If `degrees` is in (max, min) format instead of (min, max).
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.RandomSharpness((0.5, 1.5)),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_positive_degrees
def __init__(self, degrees=(0.1, 1.9)):
self.degrees = degrees
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be sharpness adjusted.
Returns:
PIL Image, sharpness adjusted image.
"""
return util.random_sharpness(img, self.degrees)
class AdjustGamma(py_transforms.PyTensorOperation):
"""
Perform gamma correction on the input PIL Image.
Args:
gamma (float): Gamma parameter in the correction equation, which must be non negative.
gain (float, optional): The constant multiplier (default=1.0).
Raises:
TypeError: If `gain` is not of type float.
TypeError: If `gamma` is not of type float.
ValueError: If `gamma` is less than 0.
RuntimeError: If given tensor shape is not <H, W> or <H, W, C>.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.AdjustGamma(gamma=10.0),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_adjust_gamma
def __init__(self, gamma, gain=1.0):
self.gamma = gamma
self.gain = gain
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be gamma adjusted.
Returns:
PIL Image, gamma adjusted image.
"""
return util.adjust_gamma(img, self.gamma, self.gain)
[docs]class AutoContrast(py_transforms.PyTensorOperation):
"""
Automatically maximize the contrast of the input PIL Image.
Args:
cutoff (float, optional): Percent of pixels to be cut off from the histogram,
which must be in range of [0.0, 50.0) (default=0.0).
ignore (Union[int, sequence], optional): Pixel values to be ignored (default=None).
Raises:
TypeError: If `cutoff` is not of type float.
TypeError: If `ignore` is not of type int or sequence.
ValueError: If `cutoff` is not in range [0, 50.0).
ValueError: If `ignore` is not in range [0, 255].
RuntimeError: If given tensor shape is not <H, W> or <H, W, C>.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.AutoContrast(),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
@check_auto_contrast
def __init__(self, cutoff=0.0, ignore=None):
self.cutoff = cutoff
self.ignore = ignore
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be automatically contrasted.
Returns:
PIL Image, automatically contrasted image.
"""
return util.auto_contrast(img, self.cutoff, self.ignore)
[docs]class Invert(py_transforms.PyTensorOperation):
"""
Invert the colors of the input PIL Image.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.Invert(),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
def __init__(self):
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be color inverted.
Returns:
PIL Image, color inverted image.
"""
return util.invert_color(img)
[docs]class Equalize(py_transforms.PyTensorOperation):
"""
Apply histogram equalization on the input PIL Image.
Supported Platforms:
``CPU``
Examples:
>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
... py_vision.Equalize(),
... py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
... input_columns="image")
"""
def __init__(self):
self.random = False
def __call__(self, img):
"""
Call method.
Args:
img (PIL Image): Image to be equalized.
Returns:
PIL Image, equalized image.
"""
return util.equalize(img)