用混合模型提升激光雷达步态识别准确率,解决注意力机制缺陷。
HorGait: A Hybrid Model for Accurate Gait Recognition in LiDAR Point Cloud Planar Projections
- 结合Transformer与大卷积核CNN,改进点云投影的特征提取。
- 在SUSTech1K数据集上达到当前最优,识别准确率显著提升。
- 适合关注3D生物特征识别与激光雷达应用的研究者。
步态识别是一种远程生物特征技术,利用人体运动的动态特性在极端光照条件下识别个体。由于二维步态表示存在空间感知局限,激光雷达可直接捕获三维步态特征并以点云形式呈现,减少环境与光照干扰,显著提升隐私保护。针对复杂的三维表示,浅层网络难以实现精准识别,视觉Transformer成为主流方法。然而,注意力机制中的“哑补丁”问题限制了Transformer在步态识别中的广泛应用。本文提出HorGait方法,采用基于激光雷达点云平面投影的混合模型架构,引入LHM模块实现输入适配、长程与高阶空间交互。同时,使用大卷积核CNN替代注意力窗口,分割输入表征以缓解哑补丁问题。大量实验表明,HorGait在SUSTech1K数据集上超越现有Transformer方法,达到当前最佳性能,验证了混合模型可完整执行Transformer流程,且在点云平面投影任务中表现更优。该方法为Transformer在步态识别中的未来应用提供新思路。
原文摘要 · Abstract (English)
Gait recognition is a remote biometric technology that utilizes the dynamic characteristics of human movement to identify individuals even under various extreme lighting conditions. Due to the limitation in spatial perception capability inherent in 2D gait representations, LiDAR can directly capture 3D gait features and represent them as point clouds, reducing environmental and lighting interference in recognition while significantly advancing privacy protection. For complex 3D representations, shallow networks fail to achieve accurate recognition, making vision Transformers the foremost prevalent method. However, the prevalence of dumb patches has limited the widespread use of Transformer architecture in gait recognition. This paper proposes a method named HorGait, which utilizes a hybrid model with a Transformer architecture for gait recognition on the planar projection of 3D point clouds from LiDAR. Specifically, it employs a hybrid model structure called LHM Block to achieve input adaptation, long-range, and high-order spatial interaction of the Transformer architecture. Additionally, it uses large convolutional kernel CNNs to segment the input representation, replacing attention windows to reduce dumb patches. We conducted extensive experiments, and the results show that HorGait achieves state-of-the-art performance among Transformer architecture methods on the SUSTech1K dataset, verifying that the hybrid model can complete the full Transformer process and perform better in point cloud planar projection. The outstanding performance of HorGait offers new insights for the future application of the Transformer architecture in gait recognition.
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