3D single object tracking (SOT) in point clouds is still a challenging problem due to appearance variation, distractors, and high sparsity of point clouds. Notably, in autonomous driving scenarios, the target object typically maintains spatial adjacency across consecutive frames, predominantly moving horizontally. This spatial continuity offers valuable prior knowledge for target localization. However, existing trackers, which often employ point-wise representations, struggle to efficiently utilize this knowledge owing to the irregular format of such representations. Consequently, they require elaborate designs and solving multiple subtasks to establish spatial correspondence. In this paper, we introduce BEVTrack, a simple yet strong baseline framework for 3D SOT. After converting consecutive point clouds into the common Bird's-Eye-View representation, BEVTrack inherently encodes spatial proximity and adeptly captures motion cues for tracking via a simple element-wise operation and convolutional layers. Additionally, to better deal with objects having diverse sizes and moving patterns, BEVTrack directly learns the underlying motion distribution rather than making a fixed Laplacian or Gaussian assumption as in previous works. Without bells and whistles, BEVTrack achieves state-of-the-art performance on KITTI and NuScenes datasets while maintaining a high inference speed of 122 FPS. The code will be released at https://github.com/xmm-prio/BEVTrack.

在本文中，我们介绍了BEVTrack，一个简单但强大的三维单目标跟踪基线框架。通过将连续的点云转换成常见的鸟瞰图表示，BEVTrack通过简单的逐元素操作和卷积层，天然地编码了空间邻近性并熟练地捕捉运动线索，同时直接学习目标的运动分布，而无需假定固定的拉普拉斯或高斯。BEVTrack在KITTI和NuScenes数据集上取得了最先进的性能，并且推理速度高达122帧/秒。

BEVTrack：鸟瞰视角中点云跟踪的简单基准