torchio.data.image.Image.__init__() - Code Metrics - Inspection of "Add support for 4D images" - fepegar/torchio - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#246)

by Fernando

created 2020-07-31 17:08 UTC

torchio.data.image.Image.init() C

↳ Parent: torchio.data.image

Complexity

Conditions

Size

Total Lines	33
Code Lines	31

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	9
eloc	31
nop	8
dl	0
loc	33
rs	6.6666
c	0
b	0
f	0

How to fix Many Parameters

import warnings
from pathlib import Path
from typing import Any, Dict, Tuple, Optional

import torch
import humanize
import numpy as np
import nibabel as nib
import SimpleITK as sitk

from ..utils import nib_to_sitk, get_rotation_and_spacing_from_affine, get_stem
from ..torchio import (
    TypeData,
    TypePath,
    TypeTripletInt,
    TypeTripletFloat,
    DATA,
    TYPE,
    AFFINE,
    PATH,
    STEM,
    INTENSITY,
    LABEL,
    REPO_URL,
)
from .io import read_image, write_image


class Image(dict):

    PROTECTED_KEYS = DATA, AFFINE, TYPE, PATH, STEM

    r"""TorchIO image.

    TorchIO images are `lazy loaders`_, i.e. the data is only loaded from disk
    when needed.

    Example:
        >>> import torchio
        >>> image = torchio.Image('t1.nii.gz', type=torchio.INTENSITY)
        >>> image  # not loaded yet
        Image(path: t1.nii.gz; type: intensity)
        >>> times_two = 2 * image.data  # data is loaded and cached here
        >>> image
        Image(shape: (1, 256, 256, 176); spacing: (1.00, 1.00, 1.00); orientation: PIR+; memory: 44.0 MiB; type: intensity)
        >>> image.save('doubled_image.nii.gz')

    For information about medical image orientation, check out `NiBabel docs`_,
    the `3D Slicer wiki`_, `Graham Wideman's website`_ or `FSL docs`_.

    Args:
        path: Path to a file that can be read by
            :mod:`SimpleITK` or :mod:`nibabel` or to a directory containing
            DICOM files. If :py:attr:`tensor` is given, the data in
            :py:attr:`path` will not be read.
        type: Type of image, such as :attr:`torchio.INTENSITY` or
            :attr:`torchio.LABEL`. This will be used by the transforms to
            decide whether to apply an operation, or which interpolation to use
            when resampling. For example, `preprocessing`_ and `augmentation`_
            intensity transforms will only be applied to images with type
            :attr:`torchio.INTENSITY`. Spatial transforms will be applied to
            all types, and nearest neighbor interpolation is always used to
            resample images with type :attr:`torchio.LABEL`.
            The type :attr:`torchio.SAMPLING_MAP` may be used with instances of
            :py:class:`~torchio.data.sampler.weighted.WeightedSampler`.
        tensor: If :py:attr:`path` is not given, :attr:`tensor` must be a 3D
            :py:class:`torch.Tensor` or NumPy array with dimensions
            :math:`(D, H, W)`.
        affine: If :attr:`path` is not given, :attr:`affine` must be a
            :math:`4 \times 4` NumPy array. If ``None``, :attr:`affine` is an
            identity matrix.
        check_nans: If ``True``, issues a warning if NaNs are found
            in the image.
        **kwargs: Items that will be added to image dictionary within the
            subject sample.

    Example:
        >>> import torch
        >>> import torchio
        >>> # Loading from a file
        >>> t1_image = torchio.Image('t1.nii.gz', type=torchio.INTENSITY)
        >>> # Also:
        >>> image = torchio.ScalarImage('t1.nii.gz')
        >>> label_image = torchio.Image('t1_seg.nii.gz', type=torchio.LABEL)
        >>> # Also:
        >>> label_image = torchio.LabelMap('t1_seg.nii.gz')
        >>> image = torchio.Image(tensor=torch.rand(3, 4, 5))
        >>> image = torchio.Image('safe_image.nrrd', check_nans=False)
        >>> data, affine = image.data, image.affine
        >>> affine.shape
        (4, 4)
        >>> image.data is image[torchio.DATA]
        True
        >>> image.data is image.tensor
        True
        >>> type(image.data)
        torch.Tensor

    .. _lazy loaders: https://en.wikipedia.org/wiki/Lazy_loading
    .. _preprocessing: https://torchio.readthedocs.io/transforms/preprocessing.html#intensity
    .. _augmentation: https://torchio.readthedocs.io/transforms/augmentation.html#intensity
    .. _NiBabel docs: https://nipy.org/nibabel/image_orientation.html
    .. _3D Slicer wiki: https://www.slicer.org/wiki/Coordinate_systems
    .. _FSL docs: https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/Orientation%20Explained
    .. _Graham Wideman's website: http://www.grahamwideman.com/gw/brain/orientation/orientterms.htm

    """
    def __init__(
            self,
            path: Optional[TypePath] = None,
            type: str = INTENSITY,
            tensor: Optional[TypeData] = None,
            affine: Optional[TypeData] = None,
            check_nans: bool = True,
            spatial_dimensions: Optional[int] = None,
            **kwargs: Dict[str, Any],
            ):
        if path is None and tensor is None:
            raise ValueError('A value for path or tensor must be given')
        self._loaded = False
        self.spatial_dimensions = spatial_dimensions
        tensor = self.parse_tensor(tensor)
        affine = self.parse_affine(affine)
        if tensor is not None:
            if affine is None:
                affine = np.eye(4)
            self[DATA] = tensor
            self[AFFINE] = affine
            self._loaded = True
        for key in self.PROTECTED_KEYS:
            if key in kwargs:
                message = f'Key "{key}" is reserved. Use a different one'
                raise ValueError(message)

        super().__init__(**kwargs)
        self.path = self._parse_path(path)
        self[PATH] = '' if self.path is None else str(self.path)
        self[STEM] = '' if self.path is None else get_stem(self.path)
        self[TYPE] = type
        self.check_nans = check_nans

    def __repr__(self):
        properties = []
        if self._loaded:
            properties.extend([
                f'shape: {self.shape}',
                f'spacing: {self.get_spacing_string()}',
                f'orientation: {"".join(self.orientation)}+',
                f'memory: {humanize.naturalsize(self.memory, binary=True)}',
            ])
        else:
            properties.append(f'path: "{self.path}"')
        properties.append(f'type: {self.type}')
        properties = '; '.join(properties)
        string = f'{self.__class__.__name__}({properties})'
        return string

    def __getitem__(self, item):
        if item in (DATA, AFFINE):
            if item not in self:
                self.load()
        return super().__getitem__(item)

    @property
    def data(self):
        return self[DATA]

    @property
    def tensor(self):
        return self.data

    @property
    def affine(self):
        return self[AFFINE]

    @property
    def type(self):
        return self[TYPE]

    @property
    def shape(self) -> Tuple[int, int, int, int]:
        return tuple(self.data.shape)

    @property
    def spatial_shape(self) -> TypeTripletInt:
        return self.shape[1:]

    @property
    def orientation(self):
        return nib.aff2axcodes(self.affine)

    @property
    def spacing(self):
        _, spacing = get_rotation_and_spacing_from_affine(self.affine)
        return tuple(spacing)

    @property
    def memory(self):
        return np.prod(self.shape) * 4  # float32, i.e. 4 bytes per voxel

    def get_spacing_string(self):
        strings = [f'{n:.2f}' for n in self.spacing]
        string = f'({", ".join(strings)})'
        return string

    @staticmethod
    def _parse_path(path: TypePath) -> Path:
        if path is None:
            return None
        try:
            path = Path(path).expanduser()
        except TypeError:
            message = f'Conversion to path not possible for variable: {path}'
            raise TypeError(message)
        if not (path.is_file() or path.is_dir()):  # might be a dir with DICOM
            raise FileNotFoundError(f'File not found: {path}')
        return path

    def parse_tensor(self, tensor: TypeData) -> torch.Tensor:
        if tensor is None:
            return None
        if isinstance(tensor, np.ndarray):
            tensor = torch.from_numpy(tensor)
        tensor = self.parse_tensor_shape(tensor)
        return tensor

    def parse_tensor_shape(self, tensor: torch.Tensor) -> torch.Tensor:
        num_dimensions = tensor.ndim
        if num_dimensions == 4:  # assume 3D multichannel (C, D, H, W)
            pass
        elif num_dimensions == 2:  # assume 2D monochannel (1, 1, H, W)
            tensor = tensor[None, None]
        elif num_dimensions == 3:  # 2D multichannel or 3D monochannel?
            if self.spatial_dimensions == 2:
                # Assume (H, W, C)
                tensor = tensor.permute(2, 0, 1)[None]  # (C, 1, H, W)
            elif self.spatial_dimensions == 3:
                tensor = tensor[None]  # (1, D, H, W)
            else:  # try to guess
                shape = tensor.shape
                maybe_rgb = 3 in shape
                if maybe_rgb:
                    if shape[-1] == 3:  # (H, W, 3)
                        tensor = tensor.permute(2, 0, 1)[None]  # (3, 1, H, W)
                    elif shape[0] == 3:  # (3, H, W)
                        tensor = tensor.unsqueeze(1)  # (3, 1, H, W)
                else:  # (D, H, W)
                    tensor = tensor[None]  # (1, D, H, W)
        else:
            message = (
                f'{num_dimensions}D images not supported yet. Please create an'
                f' issue in {REPO_URL} if you would like support for them'
            )
            raise ValueError(message)
        assert tensor.ndim == 4
        return tensor

    @staticmethod
    def parse_affine(affine: np.ndarray) -> np.ndarray:
        if affine is None:
            return np.eye(4)
        if not isinstance(affine, np.ndarray):
            raise TypeError(f'Affine must be a NumPy array, not {type(affine)}')
        if affine.shape != (4, 4):
            raise ValueError(f'Affine shape must be (4, 4), not {affine.shape}')
        return affine

    def load(self) -> Tuple[torch.Tensor, np.ndarray]:
        r"""Load the image from disk.

        The file is expected to be monomodal/grayscale and 2D or 3D.
        A channels dimension is added to the tensor.

        Returns:
            Tuple containing a 4D data tensor of size
            :math:`(1, D_{in}, H_{in}, W_{in})`
            and a 2D 4x4 affine matrix
        """
        if self._loaded:
            return
        if self.path is None:
            return
        tensor, affine = read_image(self.path)
        tensor = self.parse_tensor_shape(tensor)

        if self.check_nans and torch.isnan(tensor).any():
            warnings.warn(f'NaNs found in file "{self.path}"')
        self[DATA] = tensor
        self[AFFINE] = affine
        self._loaded = True

    def save(self, path):
        """Save image to disk.

        Args:
            path: String or instance of :py:class:`pathlib.Path`.
        """
        tensor = self[DATA].squeeze()  # assume 2D if (1, 1, H, W)
        affine = self[AFFINE]
        write_image(tensor, affine, path)

    def is_2d(self) -> bool:
        return self.shape[-3] == 1

    def numpy(self) -> np.ndarray:
        """Get a NumPy array containing the image data."""
        return self[DATA].numpy()

    def as_sitk(self) -> sitk.Image:
        """Get the image as an instance of :py:class:`sitk.Image`."""
        return nib_to_sitk(self[DATA][0], self[AFFINE])

    def get_center(self, lps: bool = False) -> TypeTripletFloat:
        """Get image center in RAS+ or LPS+ coordinates.

        Args:
            lps: If ``True``, the coordinates will be in LPS+ orientation, i.e.
                the first dimension grows towards the left, etc. Otherwise, the
                coordinates will be in RAS+ orientation.
        """
        image = self.as_sitk()
        size = np.array(image.GetSize())
        center_index = (size - 1) / 2
        l, p, s = image.TransformContinuousIndexToPhysicalPoint(center_index)
        if lps:
            return (l, p, s)
        else:
            return (-l, -p, s)

    def set_check_nans(self, check_nans):
        self.check_nans = check_nans

    def crop(self, index_ini, index_fin):
        new_origin = nib.affines.apply_affine(self.affine, index_ini)
        new_affine = self.affine.copy()
        new_affine[:3, 3] = new_origin
        i0, j0, k0 = index_ini
        i1, j1, k1 = index_fin
        patch = self.data[0, i0:i1, j0:j1, k0:k1].clone()
        kwargs = dict(tensor=patch, affine=new_affine, type=self.type, path=self.path)
        for key, value in self.items():
            if key in self.PROTECTED_KEYS: continue
            kwargs[key] = value  # should I copy? deepcopy?
        return self.__class__(**kwargs)


class ScalarImage(Image):
    """Alias for :py:class:`~torchio.Image` of type :py:attr:`torchio.INTENSITY`.

    See :py:class:`~torchio.Image` for more information.

    Raises:
        ValueError: A :py:attr:`type` is used for instantiation.
    """
    def __init__(self, *args, **kwargs):
        if 'type' in kwargs and kwargs['type'] != INTENSITY:
            raise ValueError('Type of ScalarImage is always torchio.INTENSITY')
        kwargs.update({'type': INTENSITY})
        super().__init__(*args, **kwargs)


class LabelMap(Image):
    """Alias for :py:class:`~torchio.Image` of type :py:attr:`torchio.LABEL`.

    See :py:class:`~torchio.Image` for more information.

    Raises:
        ValueError: A :py:attr:`type` is used for instantiation.
    """
    def __init__(self, *args, **kwargs):
        if 'type' in kwargs and kwargs['type'] != LABEL:
            raise ValueError('Type of LabelMap is always torchio.LABEL')
        kwargs.update({'type': LABEL})
        super().__init__(*args, **kwargs)


1			import warnings
2			from pathlib import Path
3			from typing import Any, Dict, Tuple, Optional
4
5			import torch
6			import humanize
7			import numpy as np
8			import nibabel as nib
9			import SimpleITK as sitk
10
11			from ..utils import nib_to_sitk, get_rotation_and_spacing_from_affine, get_stem
12			from ..torchio import (
13			TypeData,
14			TypePath,
15			TypeTripletInt,
16			TypeTripletFloat,
17			DATA,
18			TYPE,
19			AFFINE,
20			PATH,
21			STEM,
22			INTENSITY,
23			LABEL,
24			REPO_URL,
25			)
26			from .io import read_image, write_image
27
28
29			class Image(dict):
30
31			PROTECTED_KEYS = DATA, AFFINE, TYPE, PATH, STEM
32
33			r"""TorchIO image.
34
35			TorchIO images are `lazy loaders`_, i.e. the data is only loaded from disk
36			when needed.
37
38			Example:
39			>>> import torchio
40			>>> image = torchio.Image('t1.nii.gz', type=torchio.INTENSITY)
41			>>> image # not loaded yet
42			Image(path: t1.nii.gz; type: intensity)
43			>>> times_two = 2 * image.data # data is loaded and cached here
44			>>> image
45			Image(shape: (1, 256, 256, 176); spacing: (1.00, 1.00, 1.00); orientation: PIR+; memory: 44.0 MiB; type: intensity)
46			>>> image.save('doubled_image.nii.gz')
47
48			For information about medical image orientation, check out `NiBabel docs`_,
49			the `3D Slicer wiki`_, `Graham Wideman's website`_ or `FSL docs`_.
50
51			Args:
52			path: Path to a file that can be read by
53			:mod:`SimpleITK` or :mod:`nibabel` or to a directory containing
54			DICOM files. If :py:attr:`tensor` is given, the data in
55			:py:attr:`path` will not be read.
56			type: Type of image, such as :attr:`torchio.INTENSITY` or
57			:attr:`torchio.LABEL`. This will be used by the transforms to
58			decide whether to apply an operation, or which interpolation to use
59			when resampling. For example, `preprocessing`_ and `augmentation`_
60			intensity transforms will only be applied to images with type
61			:attr:`torchio.INTENSITY`. Spatial transforms will be applied to
62			all types, and nearest neighbor interpolation is always used to
63			resample images with type :attr:`torchio.LABEL`.
64			The type :attr:`torchio.SAMPLING_MAP` may be used with instances of
65			:py:class:`~torchio.data.sampler.weighted.WeightedSampler`.
66			tensor: If :py:attr:`path` is not given, :attr:`tensor` must be a 3D
67			:py:class:`torch.Tensor` or NumPy array with dimensions
68			:math:`(D, H, W)`.
69			affine: If :attr:`path` is not given, :attr:`affine` must be a
70			:math:`4 \times 4` NumPy array. If ``None``, :attr:`affine` is an
71			identity matrix.
72			check_nans: If ``True``, issues a warning if NaNs are found
73			in the image.
74			**kwargs: Items that will be added to image dictionary within the
75			subject sample.
76
77			Example:
78			>>> import torch
79			>>> import torchio
80			>>> # Loading from a file
81			>>> t1_image = torchio.Image('t1.nii.gz', type=torchio.INTENSITY)
82			>>> # Also:
83			>>> image = torchio.ScalarImage('t1.nii.gz')
84			>>> label_image = torchio.Image('t1_seg.nii.gz', type=torchio.LABEL)
85			>>> # Also:
86			>>> label_image = torchio.LabelMap('t1_seg.nii.gz')
87			>>> image = torchio.Image(tensor=torch.rand(3, 4, 5))
88			>>> image = torchio.Image('safe_image.nrrd', check_nans=False)
89			>>> data, affine = image.data, image.affine
90			>>> affine.shape
91			(4, 4)
92			>>> image.data is image[torchio.DATA]
93			True
94			>>> image.data is image.tensor
95			True
96			>>> type(image.data)
97			torch.Tensor
98
99			.. _lazy loaders: https://en.wikipedia.org/wiki/Lazy_loading
100			.. _preprocessing: https://torchio.readthedocs.io/transforms/preprocessing.html#intensity
101			.. _augmentation: https://torchio.readthedocs.io/transforms/augmentation.html#intensity
102			.. _NiBabel docs: https://nipy.org/nibabel/image_orientation.html
103			.. _3D Slicer wiki: https://www.slicer.org/wiki/Coordinate_systems
104			.. _FSL docs: https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/Orientation%20Explained
105			.. _Graham Wideman's website: http://www.grahamwideman.com/gw/brain/orientation/orientterms.htm
106
107			"""
108			def __init__(
109			self,
110			path: Optional[TypePath] = None,
111			type: str = INTENSITY,
112			tensor: Optional[TypeData] = None,
113			affine: Optional[TypeData] = None,
114			check_nans: bool = True,
115			spatial_dimensions: Optional[int] = None,
116			**kwargs: Dict[str, Any],
117			):
118			if path is None and tensor is None:
119			raise ValueError('A value for path or tensor must be given')
120			self._loaded = False
121			self.spatial_dimensions = spatial_dimensions
122			tensor = self.parse_tensor(tensor)
123			affine = self.parse_affine(affine)
124			if tensor is not None:
125			if affine is None:
126			affine = np.eye(4)
127			self[DATA] = tensor
128			self[AFFINE] = affine
129			self._loaded = True
130			for key in self.PROTECTED_KEYS:
131			if key in kwargs:
132			message = f'Key "{key}" is reserved. Use a different one'
133			raise ValueError(message)
134
135			super().__init__(**kwargs)
136			self.path = self._parse_path(path)
137			self[PATH] = '' if self.path is None else str(self.path)
138			self[STEM] = '' if self.path is None else get_stem(self.path)
139			self[TYPE] = type
140			self.check_nans = check_nans
141
142			def __repr__(self):
143			properties = []
144			if self._loaded:
145			properties.extend([
146			f'shape: {self.shape}',
147			f'spacing: {self.get_spacing_string()}',
148			f'orientation: {"".join(self.orientation)}+',
149			f'memory: {humanize.naturalsize(self.memory, binary=True)}',
150			])
151			else:
152			properties.append(f'path: "{self.path}"')
153			properties.append(f'type: {self.type}')
154			properties = '; '.join(properties)
155			string = f'{self.__class__.__name__}({properties})'
156			return string
157
158			def __getitem__(self, item):
159			if item in (DATA, AFFINE):
160			if item not in self:
161			self.load()
162			return super().__getitem__(item)
163
164			@property
165			def data(self):
166			return self[DATA]
167
168			@property
169			def tensor(self):
170			return self.data
171
172			@property
173			def affine(self):
174			return self[AFFINE]
175
176			@property
177			def type(self):
178			return self[TYPE]
179
180			@property
181			def shape(self) -> Tuple[int, int, int, int]:
182			return tuple(self.data.shape)
183
184			@property
185			def spatial_shape(self) -> TypeTripletInt:
186			return self.shape[1:]
187
188			@property
189			def orientation(self):
190			return nib.aff2axcodes(self.affine)
191
192			@property
193			def spacing(self):
194			_, spacing = get_rotation_and_spacing_from_affine(self.affine)
195			return tuple(spacing)
196
197			@property
198			def memory(self):
199			return np.prod(self.shape) * 4 # float32, i.e. 4 bytes per voxel
200
201			def get_spacing_string(self):
202			strings = [f'{n:.2f}' for n in self.spacing]
203			string = f'({", ".join(strings)})'
204			return string
205
206			@staticmethod
207			def _parse_path(path: TypePath) -> Path:
208			if path is None:
209			return None
210			try:
211			path = Path(path).expanduser()
212			except TypeError:
213			message = f'Conversion to path not possible for variable: {path}'
214			raise TypeError(message)
215			if not (path.is_file() or path.is_dir()): # might be a dir with DICOM
216			raise FileNotFoundError(f'File not found: {path}')
217			return path
218
219			def parse_tensor(self, tensor: TypeData) -> torch.Tensor:
220			if tensor is None:
221			return None
222			if isinstance(tensor, np.ndarray):
223			tensor = torch.from_numpy(tensor)
224			tensor = self.parse_tensor_shape(tensor)
225			return tensor
226
227			def parse_tensor_shape(self, tensor: torch.Tensor) -> torch.Tensor:
228			num_dimensions = tensor.ndim
229			if num_dimensions == 4: # assume 3D multichannel (C, D, H, W)
230			pass
231			elif num_dimensions == 2: # assume 2D monochannel (1, 1, H, W)
232			tensor = tensor[None, None]
233			elif num_dimensions == 3: # 2D multichannel or 3D monochannel?
234			if self.spatial_dimensions == 2:
235			# Assume (H, W, C)
236			tensor = tensor.permute(2, 0, 1)[None] # (C, 1, H, W)
237			elif self.spatial_dimensions == 3:
238			tensor = tensor[None] # (1, D, H, W)
239			else: # try to guess
240			shape = tensor.shape
241			maybe_rgb = 3 in shape
242			if maybe_rgb:
243			if shape[-1] == 3: # (H, W, 3)
244			tensor = tensor.permute(2, 0, 1)[None] # (3, 1, H, W)
245			elif shape[0] == 3: # (3, H, W)
246			tensor = tensor.unsqueeze(1) # (3, 1, H, W)
247			else: # (D, H, W)
248			tensor = tensor[None] # (1, D, H, W)
249			else:
250			message = (
251			f'{num_dimensions}D images not supported yet. Please create an'
252			f' issue in {REPO_URL} if you would like support for them'
253			)
254			raise ValueError(message)
255			assert tensor.ndim == 4
256			return tensor
257
258			@staticmethod
259			def parse_affine(affine: np.ndarray) -> np.ndarray:
260			if affine is None:
261			return np.eye(4)
262			if not isinstance(affine, np.ndarray):
263			raise TypeError(f'Affine must be a NumPy array, not {type(affine)}')
264			if affine.shape != (4, 4):
265			raise ValueError(f'Affine shape must be (4, 4), not {affine.shape}')
266			return affine
267
268			def load(self) -> Tuple[torch.Tensor, np.ndarray]:
269			r"""Load the image from disk.
270
271			The file is expected to be monomodal/grayscale and 2D or 3D.
272			A channels dimension is added to the tensor.
273
274			Returns:
275			Tuple containing a 4D data tensor of size
276			:math:`(1, D_{in}, H_{in}, W_{in})`
277			and a 2D 4x4 affine matrix
278			"""
279			if self._loaded:
280			return
281			if self.path is None:
282			return
283			tensor, affine = read_image(self.path)
284			tensor = self.parse_tensor_shape(tensor)
285
286			if self.check_nans and torch.isnan(tensor).any():
287			warnings.warn(f'NaNs found in file "{self.path}"')
288			self[DATA] = tensor
289			self[AFFINE] = affine
290			self._loaded = True
291
292			def save(self, path):
293			"""Save image to disk.
294
295			Args:
296			path: String or instance of :py:class:`pathlib.Path`.
297			"""
298			tensor = self[DATA].squeeze() # assume 2D if (1, 1, H, W)
299			affine = self[AFFINE]
300			write_image(tensor, affine, path)
301
302			def is_2d(self) -> bool:
303			return self.shape[-3] == 1
304
305			def numpy(self) -> np.ndarray:
306			"""Get a NumPy array containing the image data."""
307			return self[DATA].numpy()
308
309			def as_sitk(self) -> sitk.Image:
310			"""Get the image as an instance of :py:class:`sitk.Image`."""
311			return nib_to_sitk(self[DATA][0], self[AFFINE])
312
313			def get_center(self, lps: bool = False) -> TypeTripletFloat:
314			"""Get image center in RAS+ or LPS+ coordinates.
315
316			Args:
317			lps: If ``True``, the coordinates will be in LPS+ orientation, i.e.
318			the first dimension grows towards the left, etc. Otherwise, the
319			coordinates will be in RAS+ orientation.
320			"""
321			image = self.as_sitk()
322			size = np.array(image.GetSize())
323			center_index = (size - 1) / 2
324			l, p, s = image.TransformContinuousIndexToPhysicalPoint(center_index)
325			if lps:
326			return (l, p, s)
327			else:
328			return (-l, -p, s)
329
330			def set_check_nans(self, check_nans):
331			self.check_nans = check_nans
332
333			def crop(self, index_ini, index_fin):
334			new_origin = nib.affines.apply_affine(self.affine, index_ini)
335			new_affine = self.affine.copy()
336			new_affine[:3, 3] = new_origin
337			i0, j0, k0 = index_ini
338			i1, j1, k1 = index_fin
339			patch = self.data[0, i0:i1, j0:j1, k0:k1].clone()
340			kwargs = dict(tensor=patch, affine=new_affine, type=self.type, path=self.path)
341			for key, value in self.items():
342			if key in self.PROTECTED_KEYS: continue
343			kwargs[key] = value # should I copy? deepcopy?
344			return self.__class__(**kwargs)
345
346
347			class ScalarImage(Image):
348			"""Alias for :py:class:`~torchio.Image` of type :py:attr:`torchio.INTENSITY`.
349
350			See :py:class:`~torchio.Image` for more information.
351
352			Raises:
353			ValueError: A :py:attr:`type` is used for instantiation.
354			"""
355			def __init__(self, args, *kwargs):
356			if 'type' in kwargs and kwargs['type'] != INTENSITY:
357			raise ValueError('Type of ScalarImage is always torchio.INTENSITY')
358			kwargs.update({'type': INTENSITY})
359			super().__init__(args, *kwargs)
360
361
362			class LabelMap(Image):
363			"""Alias for :py:class:`~torchio.Image` of type :py:attr:`torchio.LABEL`.
364
365			See :py:class:`~torchio.Image` for more information.
366
367			Raises:
368			ValueError: A :py:attr:`type` is used for instantiation.
369			"""
370			def __init__(self, args, *kwargs):
371			if 'type' in kwargs and kwargs['type'] != LABEL:
372			raise ValueError('Type of LabelMap is always torchio.LABEL')
373			kwargs.update({'type': LABEL})
374			super().__init__(args, *kwargs)
375

fepegar / torchio

Pull Request — master (#246)

torchio.data.image.Image.__init__() C

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torchio.data.image.Image.init() C