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| # Copyright (c) OpenMMLab. All rights reserved. | |
| from typing import Dict, Optional, Tuple | |
| import cv2 | |
| import numpy as np | |
| from mmcv.transforms import BaseTransform | |
| from mmengine import is_seq_of | |
| from mmpose.registry import TRANSFORMS | |
| from mmpose.structures.bbox import get_udp_warp_matrix, get_warp_matrix | |
| class TopdownAffine(BaseTransform): | |
| """Get the bbox image as the model input by affine transform. | |
| Required Keys: | |
| - img | |
| - bbox_center | |
| - bbox_scale | |
| - bbox_rotation (optional) | |
| - keypoints (optional) | |
| Modified Keys: | |
| - img | |
| - bbox_scale | |
| Added Keys: | |
| - input_size | |
| - transformed_keypoints | |
| Args: | |
| input_size (Tuple[int, int]): The input image size of the model in | |
| [w, h]. The bbox region will be cropped and resize to `input_size` | |
| use_udp (bool): Whether use unbiased data processing. See | |
| `UDP (CVPR 2020)`_ for details. Defaults to ``False`` | |
| .. _`UDP (CVPR 2020)`: https://arxiv.org/abs/1911.07524 | |
| """ | |
| def __init__(self, | |
| input_size: Tuple[int, int], | |
| use_udp: bool = False) -> None: | |
| super().__init__() | |
| assert is_seq_of(input_size, int) and len(input_size) == 2, ( | |
| f'Invalid input_size {input_size}') | |
| self.input_size = input_size | |
| self.use_udp = use_udp | |
| def _fix_aspect_ratio(bbox_scale: np.ndarray, aspect_ratio: float): | |
| """Reshape the bbox to a fixed aspect ratio. | |
| Args: | |
| bbox_scale (np.ndarray): The bbox scales (w, h) in shape (n, 2) | |
| aspect_ratio (float): The ratio of ``w/h`` | |
| Returns: | |
| np.darray: The reshaped bbox scales in (n, 2) | |
| """ | |
| w, h = np.hsplit(bbox_scale, [1]) | |
| bbox_scale = np.where(w > h * aspect_ratio, | |
| np.hstack([w, w / aspect_ratio]), | |
| np.hstack([h * aspect_ratio, h])) | |
| return bbox_scale | |
| def transform(self, results: Dict) -> Optional[dict]: | |
| """The transform function of :class:`TopdownAffine`. | |
| See ``transform()`` method of :class:`BaseTransform` for details. | |
| Args: | |
| results (dict): The result dict | |
| Returns: | |
| dict: The result dict. | |
| """ | |
| w, h = self.input_size | |
| warp_size = (int(w), int(h)) | |
| # reshape bbox to fixed aspect ratio | |
| results['bbox_scale'] = self._fix_aspect_ratio( | |
| results['bbox_scale'], aspect_ratio=w / h) | |
| # TODO: support multi-instance | |
| assert results['bbox_center'].shape[0] == 1, ( | |
| 'Top-down heatmap only supports single instance. Got invalid ' | |
| f'shape of bbox_center {results["bbox_center"].shape}.') | |
| center = results['bbox_center'][0] | |
| scale = results['bbox_scale'][0] | |
| if 'bbox_rotation' in results: | |
| rot = results['bbox_rotation'][0] | |
| else: | |
| rot = 0. | |
| if self.use_udp: | |
| warp_mat = get_udp_warp_matrix( | |
| center, scale, rot, output_size=(w, h)) | |
| else: | |
| warp_mat = get_warp_matrix(center, scale, rot, output_size=(w, h)) | |
| if isinstance(results['img'], list): | |
| results['img'] = [ | |
| cv2.warpAffine( | |
| img, warp_mat, warp_size, flags=cv2.INTER_LINEAR) | |
| for img in results['img'] | |
| ] | |
| else: | |
| results['img'] = cv2.warpAffine( | |
| results['img'], warp_mat, warp_size, flags=cv2.INTER_LINEAR) | |
| if results.get('keypoints', None) is not None: | |
| transformed_keypoints = results['keypoints'].copy() | |
| # Only transform (x, y) coordinates | |
| transformed_keypoints[..., :2] = cv2.transform( | |
| results['keypoints'][..., :2], warp_mat) | |
| results['transformed_keypoints'] = transformed_keypoints | |
| results['input_size'] = (w, h) | |
| return results | |
| def __repr__(self) -> str: | |
| """print the basic information of the transform. | |
| Returns: | |
| str: Formatted string. | |
| """ | |
| repr_str = self.__class__.__name__ | |
| repr_str += f'(input_size={self.input_size}, ' | |
| repr_str += f'use_udp={self.use_udp})' | |
| return repr_str | |