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92 lines
3.6 KiB
92 lines
3.6 KiB
# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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import copy |
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import os.path as osp |
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from .operators import * |
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from .batch_operators import BatchRandomResize, BatchRandomResizeByShort, _BatchPad |
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from paddlers import transforms as T |
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def decode_image(im_path, |
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to_rgb=True, |
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to_uint8=True, |
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decode_bgr=True, |
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decode_sar=True, |
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read_geo_info=False, |
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use_stretch=False, |
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read_raw=False): |
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""" |
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Decode an image. |
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Args: |
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im_path (str): Path of the image to decode. |
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to_rgb (bool, optional): (Deprecated) If True, convert input image(s) from |
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BGR format to RGB format. Defaults to True. |
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to_uint8 (bool, optional): If True, quantize and convert decoded image(s) to |
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uint8 type. Defaults to True. |
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decode_bgr (bool, optional): If True, automatically interpret a non-geo |
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image (e.g. jpeg images) as a BGR image. Defaults to True. |
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decode_sar (bool, optional): If True, automatically interpret a single-channel |
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geo image (e.g. geotiff images) as a SAR image, set this argument to |
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True. Defaults to True. |
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read_geo_info (bool, optional): If True, read geographical information from |
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the image. Deafults to False. |
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use_stretch (bool, optional): Whether to apply 2% linear stretch. Valid only if |
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`to_uint8` is True. Defaults to False. |
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read_raw (bool, optional): If True, equivalent to setting `to_rgb` to `True` and |
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`to_uint8` to False. Setting `read_raw` takes precedence over setting `to_rgb` |
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and `to_uint8`. Defaults to False. |
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Returns: |
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np.ndarray|tuple: If `read_geo_info` is False, return the decoded image. |
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Otherwise, return a tuple that contains the decoded image and a dictionary |
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of geographical information (e.g. geographical transform and geographical |
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projection). |
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""" |
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# Do a presence check. osp.exists() assumes `im_path` is a path-like object. |
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if not osp.exists(im_path): |
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raise ValueError(f"{im_path} does not exist!") |
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if read_raw: |
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to_rgb = True |
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to_uint8 = False |
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decoder = T.DecodeImg( |
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to_rgb=to_rgb, |
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to_uint8=to_uint8, |
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decode_bgr=decode_bgr, |
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decode_sar=decode_sar, |
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read_geo_info=read_geo_info, |
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use_stretch=use_stretch) |
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# Deepcopy to avoid inplace modification |
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sample = {'image': copy.deepcopy(im_path)} |
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sample = decoder(sample) |
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if read_geo_info: |
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return sample['image'], sample['geo_info_dict'] |
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else: |
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return sample['image'] |
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def build_transforms(transforms_info): |
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transforms = list() |
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for op_info in transforms_info: |
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op_name = list(op_info.keys())[0] |
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op_attr = op_info[op_name] |
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if not hasattr(T, op_name): |
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raise ValueError( |
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"There is no transform operator named '{}'.".format(op_name)) |
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transforms.append(getattr(T, op_name)(**op_attr)) |
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eval_transforms = T.Compose(transforms) |
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return eval_transforms
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