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- # Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
- #
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- # This code is based on https://github.com/kkanshul/Hide-and-Seek
- import numpy as np
- import random
- class HideAndSeek(object):
- def __init__(self):
- # possible grid size, 0 means no hiding
- self.grid_sizes = [0, 16, 32, 44, 56]
- # hiding probability
- self.hide_prob = 0.5
- def __call__(self, img):
- # randomly choose one grid size
- grid_size = np.random.choice(self.grid_sizes)
- _, h, w = img.shape
- # hide the patches
- if grid_size == 0:
- return img
- for x in range(0, w, grid_size):
- for y in range(0, h, grid_size):
- x_end = min(w, x + grid_size)
- y_end = min(h, y + grid_size)
- if (random.random() <= self.hide_prob):
- img[:, x:x_end, y:y_end] = 0
- return img
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