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69 lines
2.1 KiB
Python
69 lines
2.1 KiB
Python
# -*- coding: utf-8 -*-
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# @Time : 2019/12/4 18:06
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# @Author : zhoujun
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import numpy as np
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import imgaug
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import imgaug.augmenters as iaa
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class AugmenterBuilder(object):
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def __init__(self):
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pass
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def build(self, args, root=True):
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if args is None or len(args) == 0:
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return None
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elif isinstance(args, list):
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if root:
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sequence = [self.build(value, root=False) for value in args]
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return iaa.Sequential(sequence)
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else:
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return getattr(iaa, args[0])(
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*[self.to_tuple_if_list(a) for a in args[1:]]
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)
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elif isinstance(args, dict):
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cls = getattr(iaa, args["type"])
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return cls(**{k: self.to_tuple_if_list(v) for k, v in args["args"].items()})
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else:
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raise RuntimeError("unknown augmenter arg: " + str(args))
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def to_tuple_if_list(self, obj):
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if isinstance(obj, list):
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return tuple(obj)
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return obj
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class IaaAugment:
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def __init__(self, augmenter_args):
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self.augmenter_args = augmenter_args
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self.augmenter = AugmenterBuilder().build(self.augmenter_args)
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def __call__(self, data):
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image = data["Crop_img"]
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shape = image.shape
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if self.augmenter:
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aug = self.augmenter.to_deterministic()
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data["Crop_img"] = aug.augment_image(image)
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data = self.may_augment_annotation(aug, data, shape)
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return data
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def may_augment_annotation(self, aug, data, shape):
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if aug is None:
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return data
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line_polys = []
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for poly in data["text_polys"]:
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new_poly = self.may_augment_poly(aug, shape, poly)
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line_polys.append(new_poly)
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data["text_polys"] = np.array(line_polys)
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return data
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def may_augment_poly(self, aug, img_shape, poly):
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keypoints = [imgaug.Keypoint(p[0], p[1]) for p in poly]
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keypoints = aug.augment_keypoints(
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[imgaug.KeypointsOnImage(keypoints, shape=img_shape)]
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)[0].keypoints
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poly = [(p.x, p.y) for p in keypoints]
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return poly
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