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ReDet

ReDet: A Rotation-equivariant Detector for Aerial Object Detection

Abstract

Recently, object detection in aerial images has gained much attention in computer vision. Different from objects in natural images, aerial objects are often distributed with arbitrary orientation. Therefore, the detector requires more parameters to encode the orientation information, which are often highly redundant and inefficient. Moreover, as ordinary CNNs do not explicitly model the orientation variation, large amounts of rotation augmented data is needed to train an accurate object detector. In this paper, we propose a Rotation-equivariant Detector (ReDet) to address these issues, which explicitly encodes rotation equivariance and rotation invariance. More precisely, we incorporate rotation-equivariant networks into the detector to extract rotation-equivariant features, which can accurately predict the orientation and lead to a huge reduction of model size. Based on the rotation-equivariant features, we also present Rotation-invariant RoI Align (RiRoI Align), which adaptively extracts rotation-invariant features from equivariant features according to the orientation of RoI. Extensive experiments on several challenging aerial image datasets DOTA-v1.0, DOTA-v1.5 and HRSC2016, show that our method can achieve state-of-the-art performance on the task of aerial object detection. Compared with previous best results, our ReDet gains 1.2, 3.5 and 2.6 mAP on DOTA-v1.0, DOTA-v1.5 and HRSC2016 respectively while reducing the number of parameters by 60% (313 Mb vs. 121 Mb).

Results and models

DOTA1.0

Backbone mAP Angle lr schd Mem (GB) Inf Time (fps) Aug Batch Size Configs Download
ResNet50 (1024,1024,200) 73.40 le90 1x 8.46 16.5 - 2 rotated_faster_rcnn_r50_fpn_1x_dota_le90 model | log
ReResNet50 (1024,1024,200) 75.99 le90 1x 7.71 13.3 - 2 redet_re50_refpn_fp16_1x_dota_le90 model | log
ReResNet50 (1024,1024,200) 76.68 le90 1x 9.32 10.9 - 2 redet_re50_refpn_1x_dota_le90 model | log
ReResNet50 (1024,1024,500) 79.87 le90 1x 10.9 MS+RR 2 redet_re50_refpn_1x_dota_ms_rr_le90 model | log

HRSC

Backbone mAP AP50 AP75 Angle lr schd Mem (GB) Inf Time (fps) Aug Batch Size Configs Download
ReResNet50 (800,512) 72.31 90.40 89.50 le90 3x 2.30 17.5 - 2 redet_re50_refpn_3x_hrsc_le90 model | log

Notes:

  • MS means multiple scale image split.
  • RR means random rotation.
  • Please download pretrained weight of ReResNet from ReDet, and put it on work_dirs/pretrain. BTW, it is normal for missing keys in source state_dict: xxx.filter to appear in the log. Don't worry!

Citation

@inproceedings{han2021redet,
  title={Redet: A rotation-equivariant detector for aerial object detection},
  author={Han, Jiaming and Ding, Jian and Xue, Nan and Xia, Gui-Song},
  booktitle={Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition},
  pages={2786--2795},
  year={2021}
}