arXiv:2506.20636cs.RO2025-06

兼顾精度与计算成本,实现相机与激光雷达的高效校准。

A Computationally Aware Multi Objective Framework for Camera LiDAR Calibration

  • 多目标优化同时降低点云投影误差与运行开销。
  • 在KITTI数据集上达到高精度校准,且资源消耗更低。
  • 适合嵌入式系统部署,支持OTA更新的自动驾驶车辆。

准确的相机与激光雷达外参标定对自动驾驶系统的可靠感知至关重要。本文提出一种新型多目标优化框架,联合最小化几何对齐误差与计算成本。优化目标包括:(1) 投影点与图像边缘的真实误差;(2) 反映运行时间和资源使用情况的复合计算成本指标。采用NSGA-II进化算法,在6-自由度变换参数与点采样率构成的参数空间中搜索,生成清晰的帕累托前沿,揭示校准精度与资源效率间的权衡关系。在KITTI数据集上使用真实外参验证,结果通过多目标及约束单目标基线对比。相比现有基于梯度和学习的校准方法,本方法具有可解释性、可调节性,并具备更低的部署开销。对帕累托最优解进行敏感性分析,发现关键创新点。基于偏好决策策略从帕累托膝点区域选取适配嵌入式系统的解。在不同边缘强度权重下测试校准鲁棒性,识别最优平衡点。虽实时嵌入平台部署暂未实现,但该框架为真实失准与资源受限场景下的校准提供可扩展、透明的解决方案,对长期自主运行尤其适用于获得OTA更新的SAE L3+级车辆。

原文摘要 · Abstract (English)

Accurate extrinsic calibration between LiDAR and camera sensors is important for reliable perception in autonomous systems. In this paper, we present a novel multi-objective optimization framework that jointly minimizes the geometric alignment error and computational cost associated with camera-LiDAR calibration. We optimize two objectives: (1) error between projected LiDAR points and ground-truth image edges, and (2) a composite metric for computational cost reflecting runtime and resource usage. Using the NSGA-II \cite{deb2002nsga2} evolutionary algorithm, we explore the parameter space defined by 6-DoF transformations and point sampling rates, yielding a well-characterized Pareto frontier that exposes trade-offs between calibration fidelity and resource efficiency. Evaluations are conducted on the KITTI dataset using its ground-truth extrinsic parameters for validation, with results verified through both multi-objective and constrained single-objective baselines. Compared to existing gradient-based and learned calibration methods, our approach demonstrates interpretable, tunable performance with lower deployment overhead. Pareto-optimal configurations are further analyzed for parameter sensitivity and innovation insights. A preference-based decision-making strategy selects solutions from the Pareto knee region to suit the constraints of the embedded system. The robustness of calibration is tested across variable edge-intensity weighting schemes, highlighting optimal balance points. Although real-time deployment on embedded platforms is deferred to future work, this framework establishes a scalable and transparent method for calibration under realistic misalignment and resource-limited conditions, critical for long-term autonomy, particularly in SAE L3+ vehicles receiving OTA updates.

传感器融合多目标优化自动驾驶嵌入式系统

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