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| # Copyright (c) OpenMMLab. All rights reserved. | |
| import torch | |
| from mmdet.core import bbox2result, bbox_mapping_back | |
| from ..builder import DETECTORS | |
| from .single_stage import SingleStageDetector | |
| class CornerNet(SingleStageDetector): | |
| """CornerNet. | |
| This detector is the implementation of the paper `CornerNet: Detecting | |
| Objects as Paired Keypoints <https://arxiv.org/abs/1808.01244>`_ . | |
| """ | |
| def __init__(self, | |
| backbone, | |
| neck, | |
| bbox_head, | |
| train_cfg=None, | |
| test_cfg=None, | |
| pretrained=None, | |
| init_cfg=None): | |
| super(CornerNet, self).__init__(backbone, neck, bbox_head, train_cfg, | |
| test_cfg, pretrained, init_cfg) | |
| def merge_aug_results(self, aug_results, img_metas): | |
| """Merge augmented detection bboxes and score. | |
| Args: | |
| aug_results (list[list[Tensor]]): Det_bboxes and det_labels of each | |
| image. | |
| img_metas (list[list[dict]]): Meta information of each image, e.g., | |
| image size, scaling factor, etc. | |
| Returns: | |
| tuple: (bboxes, labels) | |
| """ | |
| recovered_bboxes, aug_labels = [], [] | |
| for bboxes_labels, img_info in zip(aug_results, img_metas): | |
| img_shape = img_info[0]['img_shape'] # using shape before padding | |
| scale_factor = img_info[0]['scale_factor'] | |
| flip = img_info[0]['flip'] | |
| bboxes, labels = bboxes_labels | |
| bboxes, scores = bboxes[:, :4], bboxes[:, -1:] | |
| bboxes = bbox_mapping_back(bboxes, img_shape, scale_factor, flip) | |
| recovered_bboxes.append(torch.cat([bboxes, scores], dim=-1)) | |
| aug_labels.append(labels) | |
| bboxes = torch.cat(recovered_bboxes, dim=0) | |
| labels = torch.cat(aug_labels) | |
| if bboxes.shape[0] > 0: | |
| out_bboxes, out_labels = self.bbox_head._bboxes_nms( | |
| bboxes, labels, self.bbox_head.test_cfg) | |
| else: | |
| out_bboxes, out_labels = bboxes, labels | |
| return out_bboxes, out_labels | |
| def aug_test(self, imgs, img_metas, rescale=False): | |
| """Augment testing of CornerNet. | |
| Args: | |
| imgs (list[Tensor]): Augmented images. | |
| img_metas (list[list[dict]]): Meta information of each image, e.g., | |
| image size, scaling factor, etc. | |
| rescale (bool): If True, return boxes in original image space. | |
| Default: False. | |
| Note: | |
| ``imgs`` must including flipped image pairs. | |
| Returns: | |
| list[list[np.ndarray]]: BBox results of each image and classes. | |
| The outer list corresponds to each image. The inner list | |
| corresponds to each class. | |
| """ | |
| img_inds = list(range(len(imgs))) | |
| assert img_metas[0][0]['flip'] + img_metas[1][0]['flip'], ( | |
| 'aug test must have flipped image pair') | |
| aug_results = [] | |
| for ind, flip_ind in zip(img_inds[0::2], img_inds[1::2]): | |
| img_pair = torch.cat([imgs[ind], imgs[flip_ind]]) | |
| x = self.extract_feat(img_pair) | |
| outs = self.bbox_head(x) | |
| bbox_list = self.bbox_head.get_bboxes( | |
| *outs, [img_metas[ind], img_metas[flip_ind]], False, False) | |
| aug_results.append(bbox_list[0]) | |
| aug_results.append(bbox_list[1]) | |
| bboxes, labels = self.merge_aug_results(aug_results, img_metas) | |
| bbox_results = bbox2result(bboxes, labels, self.bbox_head.num_classes) | |
| return [bbox_results] | |