End-to-End Object Detection With Fully Convolutional Network

Mainstream object detectors based on the fully convolutional network has achieved impressive performance. While most of them still need a hand-designed non-maximum suppression (NMS) post-processing, which impedes fully endto-end training. In this paper, we give the analysis of discarding NMS, where the results reveal that a proper label assignment plays a crucial role. To this end, for fully convolutional detectors, we introduce a Prediction-aware One-To-One (POTO) label assignment for classification to enable end-to-end detection, which obtains comparable performance with NMS. Besides, a simple 3D Max Filtering (3DMF) is proposed to utilize the multi-scale features and improve the discriminability of convolutions in the local region. With these techniques, our end-to-end framework achieves competitive performance against many state-ofthe-art detectors with NMS on COCO and CrowdHuman datasets. The code is available at https://github . com/Megvii-BaseDetection/DeFCN . * Equal contribution. † This work was done at Megvii Technology. * We remove its centerness branch to achieve a head-to-head comparison.