Method get_data

monai/data/image_reader.py:279–310

Extract data array and metadata from loaded image and return them. This function returns two objects, first is numpy array of image data, second is dict of metadata. It constructs `affine`, `original_affine`, and `spatial_shape` and stores them in meta dict. When loa

(self, img)

        return img_ if len(filenames) > 1 else img_[0]

    def get_data(self, img) -> tuple[np.ndarray, dict]:
        """
        Extract data array and metadata from loaded image and return them.
        This function returns two objects, first is numpy array of image data, second is dict of metadata.
        It constructs `affine`, `original_affine`, and `spatial_shape` and stores them in meta dict.
        When loading a list of files, they are stacked together at a new dimension as the first dimension,
        and the metadata of the first image is used to represent the output metadata.

        Args:
            img: an ITK image object loaded from an image file or a list of ITK image objects.

        """
        img_array: list[np.ndarray] = []
        compatible_meta: dict = {}

        for i in ensure_tuple(img):
            data = self._get_array_data(i)
            img_array.append(data)
            header = self._get_meta_dict(i)
            header[MetaKeys.ORIGINAL_AFFINE] = self._get_affine(i, self.affine_lps_to_ras)
            header[MetaKeys.SPACE] = SpaceKeys.RAS if self.affine_lps_to_ras else SpaceKeys.LPS
            header[MetaKeys.AFFINE] = header[MetaKeys.ORIGINAL_AFFINE].copy()
            header[MetaKeys.SPATIAL_SHAPE] = self._get_spatial_shape(i)
            if self.channel_dim is None:  # default to "no_channel" or -1
                header[MetaKeys.ORIGINAL_CHANNEL_DIM] = (
                    float("nan") if len(data.shape) == len(header[MetaKeys.SPATIAL_SHAPE]) else -1
                )
            else:
                header[MetaKeys.ORIGINAL_CHANNEL_DIM] = self.channel_dim
            _copy_compatible_dict(header, compatible_meta)

        return _stack_images(img_array, compatible_meta), compatible_meta

    def _get_meta_dict(self, img) -> dict:
        """