Load an image from file. Required keys are "img_prefix" and "img_info" (a dict that must contain the key "filename"). Added or updated keys are "filename", "img", "img_shape", "ori_shape" (same as `img_shape`), "pad_shape" (same as `img_shape`), "scale_factor" (1.0) and "img_norm_cf
| 8 | |
| 9 | @PIPELINES.register_module() |
| 10 | class LoadImageFromFile(object): |
| 11 | """Load an image from file. |
| 12 | |
| 13 | Required keys are "img_prefix" and "img_info" (a dict that must contain the |
| 14 | key "filename"). Added or updated keys are "filename", "img", "img_shape", |
| 15 | "ori_shape" (same as `img_shape`), "pad_shape" (same as `img_shape`), |
| 16 | "scale_factor" (1.0) and "img_norm_cfg" (means=0 and stds=1). |
| 17 | |
| 18 | Args: |
| 19 | to_float32 (bool): Whether to convert the loaded image to a float32 |
| 20 | numpy array. If set to False, the loaded image is an uint8 array. |
| 21 | Defaults to False. |
| 22 | color_type (str): The flag argument for :func:`mmcv.imfrombytes`. |
| 23 | Defaults to 'color'. |
| 24 | file_client_args (dict): Arguments to instantiate a FileClient. |
| 25 | See :class:`mmcv.fileio.FileClient` for details. |
| 26 | Defaults to ``dict(backend='disk')``. |
| 27 | imdecode_backend (str): Backend for :func:`mmcv.imdecode`. Default: |
| 28 | 'cv2' |
| 29 | """ |
| 30 | |
| 31 | def __init__(self, |
| 32 | to_float32=False, |
| 33 | color_type='color', |
| 34 | file_client_args=dict(backend='disk'), |
| 35 | imdecode_backend='cv2'): |
| 36 | self.to_float32 = to_float32 |
| 37 | self.color_type = color_type |
| 38 | self.file_client_args = file_client_args.copy() |
| 39 | self.file_client = None |
| 40 | self.imdecode_backend = imdecode_backend |
| 41 | |
| 42 | def __call__(self, results): |
| 43 | """Call functions to load image and get image meta information. |
| 44 | |
| 45 | Args: |
| 46 | results (dict): Result dict from :obj:`mmseg.CustomDataset`. |
| 47 | |
| 48 | Returns: |
| 49 | dict: The dict contains loaded image and meta information. |
| 50 | """ |
| 51 | |
| 52 | if self.file_client is None: |
| 53 | self.file_client = mmcv.FileClient(**self.file_client_args) |
| 54 | |
| 55 | if results.get('img_prefix') is not None: |
| 56 | filename = osp.join(results['img_prefix'], |
| 57 | results['img_info']['filename']) |
| 58 | else: |
| 59 | filename = results['img_info']['filename'] |
| 60 | img_bytes = self.file_client.get(filename) |
| 61 | img = mmcv.imfrombytes( |
| 62 | img_bytes, flag=self.color_type, backend=self.imdecode_backend) |
| 63 | if self.to_float32: |
| 64 | img = img.astype(np.float32) |
| 65 | |
| 66 | results['filename'] = filename |
| 67 | results['ori_filename'] = results['img_info']['filename'] |
no outgoing calls