CF2-SLAM: Conformal-Calibrated Foundation-Factor Graph SLAM across Modalities and Domains
Xiangqin Chen*
College of Engineering, Pennsylvania State University, University Park, PA, USA
* Corresponding Author: Xiangqin Chen. Email: 
Computers, Materials & Continua https://doi.org/10.32604/cmc.2026.079663
Received 26 January 2026; Accepted 10 April 2026; Published online 07 May 2026
Abstract
Simultaneous localization and mapping (SLAM) must remain reliable when sensing suites and operating conditions vary across platforms and deployments. Beyond correspondence degradation, a dominant deployment failure mode is
misweighted constraints: under distribution shift, uncertainty estimates can become miscalibrated, allowing a small set of overconfident factors to dominate iterative optimization and destabilize inference. This article presents conformal-calibrated foundation-factor graph SLAM (
CF2-SLAM), a sensor-agnostic framework that combines frozen foundation representations with lightweight probabilistic factor heads that emit explicit residuals and covariances, and a classical factor-graph back-end for principled multi-modal fusion. To mitigate systematic misweighting under shift, an online conformal calibration layer is introduced to rescale factor covariances by aligning empirical residual quantiles with target quantiles on a per-factor-family basis. Loop closure is further integrated through foundation-descriptor retrieval for candidate proposal and conservative geometric verification for graph insertion, controlling false loop constraints without relying on dataset-specific place-recognition supervision. Across heterogeneous benchmarks spanning monocular, stereo, red-green-blue-depth (RGB-D), and visual-inertial settings,
CF2-SLAM operates without retraining and shows improved robustness trends under zero-shot transfer, consistent with stabilized factor weighting.
Keywords
Simultaneous localization and mapping (SLAM); factor graph optimization; foundation models; uncertainty estimation; online calibration; conformal calibration
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