UniLGL: FOV制限/パノラマLiDARのための均一な場所認識に基づくグローバル位置推定
UniLGL: Learning Uniform Place Recognition for FOV-limited/Panoramic LiDAR Global Localization
LiDAR点群を空間・強度のBEV画像に変換し、異種センサにも対応する均一な特徴抽出と視点不変性で、登録不要の高精度なグローバル位置推定を実現した。
詳しい要約
1. どんなもの?
2. 先行研究と比べてどこがすごい?
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著者: Hongming Shen, Xun Chen, Yulin Hui, Zhenyu Wu, Wei Wang, Qiyang Lyu, Tianchen Deng, Danwei Wang
分類: cs.RO
原文アブストラクト
Existing LGL methods typically consider only partial information (e.g., geometric features) from LiDAR observations or are designed for homogeneous LiDAR sensors, overlooking the uniformity in LGL. In this work, a uniform LGL method is proposed, termed UniLGL, which simultaneously achieves spatial and material uniformity, as well as sensor-type uniformity. The key idea of the proposed method is to encode the complete point cloud, which contains both geometric and material information, into a pair of BEV images (i.e., a spatial BEV image and an intensity BEV image). An end-to-end multi-BEV fusion network is designed to extract uniform features, equipping UniLGL with spatial and material uniformity. To ensure robust LGL across heterogeneous LiDAR sensors, a viewpoint invariance hypothesis is introduced, which replaces the conventional translation equivariance assumption commonly used in existing LPR networks and supervises UniLGL to achieve sensor-type uniformity in both global descriptors and local feature representations. Finally, based on the mapping between local features on the 2D BEV image and the point cloud, a robust global pose estimator is derived that determines the global minimum of the global pose on SE(3) without requiring additional registration. To validate the effectiveness of the proposed uniform LGL, extensive benchmarks are conducted in real-world environments, and the results show that the proposed UniLGL is demonstratively competitive compared to other State-of-the-Art LGL methods. Furthermore, UniLGL has been deployed on diverse platforms, including full-size trucks and agile Micro Aerial Vehicles (MAVs), to enable high-precision localization and mapping as well as multi-MAV collaborative exploration in port and forest environments, demonstrating the applicability of UniLGL in industrial and field scenarios.
