PEFNet: Position Enhancement Faster Network for Object Detection in Roadside Perception System.

Roadside perception is a challenging research area that presents even greater difficulties than vehicle perception. Due to the different locations and angles of cameras, roadside objects exhibit violent multi-scale variations, while the vast sensing field introduces more small-scale targets and complex backgrounds, making target recognition more challenging. To address these problems, we focus on position information encoding to achieve accurate roadside object detection by proposing the position enhancement faster network (PEFNet). Based on YOLOv6, the FasterNet Block is introduced into Backbone and Neck networks to provide efficient feature extraction while achieving model lightweight transformation. To improve small target detection performance, a position-aware feature pyramid network (PA-PAN) is proposed to enhance position information encoding, and the SPD-Conv is applied in the PA-PAN to further enhance effective feature extraction. Finally, the TSCODE is integrated into the detection head to achieve accurate target recognition and suppress background noise interference. Experiments on the Rope3D and UA-DETRAC datasets show that our model outperforms advanced YOLOv6, YOLOX, and FCOS in roadside object detection. Compared with YOLOv6, our method improves the mAP0.50 on the Rope3D dataset from 78.18% to 82.39%, with the AP of small objects such as pedestrians increasing by 7.01%. Furthermore, PEFNet reduces the weight of the network by 43.1% while maintaining detection speed at 75fps and achieving higher accuracy than previous algorithms for the same number of frames.