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""" |
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@Author : Peike Li |
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@Contact : peike.li@yahoo.com |
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@File : dataset.py |
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@Time : 8/30/19 9:12 PM |
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@Desc : Dataset Definition |
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@License : This source code is licensed under the license found in the |
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LICENSE file in the root directory of this source tree. |
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""" |
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import os |
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import cv2 |
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import numpy as np |
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from torch.utils import data |
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from utils.transforms import get_affine_transform |
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class SimpleFolderDataset(data.Dataset): |
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def __init__(self, root, input_size=[512, 512], transform=None): |
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self.root = root |
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self.input_size = input_size |
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self.transform = transform |
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self.aspect_ratio = input_size[1] * 1.0 / input_size[0] |
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self.input_size = np.asarray(input_size) |
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self.file_list = os.listdir(self.root) |
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def __len__(self): |
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return len(self.file_list) |
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def _box2cs(self, box): |
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x, y, w, h = box[:4] |
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return self._xywh2cs(x, y, w, h) |
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def _xywh2cs(self, x, y, w, h): |
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center = np.zeros((2), dtype=np.float32) |
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center[0] = x + w * 0.5 |
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center[1] = y + h * 0.5 |
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if w > self.aspect_ratio * h: |
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h = w * 1.0 / self.aspect_ratio |
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elif w < self.aspect_ratio * h: |
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w = h * self.aspect_ratio |
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scale = np.array([w, h], dtype=np.float32) |
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return center, scale |
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def __getitem__(self, index): |
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img_name = self.file_list[index] |
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img_path = os.path.join(self.root, img_name) |
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img = cv2.imread(img_path, cv2.IMREAD_COLOR) |
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h, w, _ = img.shape |
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person_center, s = self._box2cs([0, 0, w - 1, h - 1]) |
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r = 0 |
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trans = get_affine_transform(person_center, s, r, self.input_size) |
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input = cv2.warpAffine( |
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img, |
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trans, |
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(int(self.input_size[1]), int(self.input_size[0])), |
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flags=cv2.INTER_LINEAR, |
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borderMode=cv2.BORDER_CONSTANT, |
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borderValue=(0, 0, 0)) |
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input = self.transform(input) |
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meta = { |
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'name': img_name, |
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'center': person_center, |
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'height': h, |
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'width': w, |
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'scale': s, |
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'rotation': r |
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} |
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return input, meta |
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