Peilin Xiao | ViLab

Enhancing Visual Tracking by Leveraging High-frequency Information within Event Signals

Wed, 01 Jan 2025 00:00:00 +0000

Traditional object trackers struggle in degraded scenarios, lacking sufficient appearance details of moving targets for precise tracking. Recent trackers have integrated highfrequency event signals to assist tracking. However, they neglect the high-temporalresolution motion information inherent in events, limiting their performance especially in occlusion and background clutter. To address these challenges, we propose HFTrack, a novel tracker designed to fully leverage the spatio-temporal high-frequency information within event signals, thereby enhancing the tracking performance. Specifically, we introduce a frequency-based feature enhancement module, which enriches the frame feature with high-frequency components from events in frequency space, capturing detailed appearance information of moving targets. Additionally, we propose a spatio-temporal information decoder with an auto-regressive temporal query, integrating both historical motion cues from events and enhanced spatial features for robust target localization. Experimental results demonstrate that our HFTrack significantly outperforms existing trackers, showcasing its strong ability to track the target under challenging conditions.

A micro-expression recognition system with event cameras

Mon, 15 Jul 2024 00:00:00 +0000

本文提出了一种基于事件相机的微表情识别系统。针对微表情持续时间短、幅度微弱、难以用传统相机捕捉的问题，系统利用事件相机的高时间分辨率特性，设计了事件增强运动提取器（EEME）以放大细微运动，并引入事件引导注意力（EGA）聚焦关键面部区域，从而提升微表情识别的准确性与鲁棒性。该系统为情感计算领域提供了有效工具。

Estme: Event-driven spatio-temporal motion enhancement for micro-expression recognition

Mon, 15 Jul 2024 00:00:00 +0000

本文针对微表情识别中动作幅度小、持续时间短、难以捕捉的问题，提出了一种事件驱动的时空运动增强网络。该方法引入事件相机捕获的高时间分辨率事件信号，设计事件增强运动提取模块以增强细微运动细节，并利用事件引导注意力模块聚焦特定区域的微小变化，从而获取更精确的空间特征。在合成和真实数据集上的实验结果表明，该方法在微表情识别任务上具有优越性能。

Better and faster: Adaptive event conversion for event-based object detection

Mon, 26 Jun 2023 00:00:00 +0000

本文针对事件相机目标检测任务，提出高效事件表示Hyper Histogram，充分保留事件极性与时间信息；设计自适应事件转换模块AEC，基于事件密度通过自适应队列将事件流转换为超直方图，并适配现有帧基检测器；还提出事件增强方法Shadow Mosaic，提升样本多样性与泛化能力。在YOLOv5、Deformable-DETR和RetinaNet上验证，在1Mpx、Gen1和MVSEC-NIGHTL21数据集上取得显著优势，且推理速度快。