46 lines
1.5 KiB
Python
46 lines
1.5 KiB
Python
# Copyright (c) 2021 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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# This code is based on https://github.com/kkanshul/Hide-and-Seek
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# reference: http://krsingh.cs.ucdavis.edu/krishna_files/papers/hide_and_seek/my_files/iccv2017.pdf
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import numpy as np
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import random
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class HideAndSeek(object):
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def __init__(self):
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# possible grid size, 0 means no hiding
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self.grid_sizes = [0, 16, 32, 44, 56]
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# hiding probability
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self.hide_prob = 0.5
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def __call__(self, img):
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# randomly choose one grid size
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grid_size = np.random.choice(self.grid_sizes)
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_, h, w = img.shape
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# hide the patches
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if grid_size == 0:
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return img
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for x in range(0, w, grid_size):
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for y in range(0, h, grid_size):
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x_end = min(w, x + grid_size)
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y_end = min(h, y + grid_size)
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if (random.random() <= self.hide_prob):
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img[:, x:x_end, y:y_end] = 0
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return img
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