現場を読む:部分的に建設された環境におけるスケール曖昧なVSLAMマップの階層プランへの意味的レジストレーション
Reading the Room: Scale-ambiguous Semantic Registration of Sparse VSLAM Maps to Floor Plans in Partially Built Environments
建設現場でVSLAMのスパースな意味マップを2D階層プランに位置合わせするため、クラスバランスの取れた微分可能な意味幾何エネルギー関数を定義し、グローバル初期化と局所最適化を統合した手法を提案。33シーケンスで軌道誤差を4.5倍改善。
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著者: Bjorn Stragier, Emilia Szymańska, J. Micah Prendergast, Lukas Rosenberger Schmid
分類: cs.RO, cs.CV
原文アブストラクト
Many robotic construction applications, such as progress tracking, require registering a sensor trajectory to a prior 2D floor plan. Visual capture is attractive for its low cost and availability, but aligning a visual simultaneous localization and mapping (VSLAM) map to a floor plan is difficult; VSLAM recovers geometry only up to an unknown similarity transform, the sparse point cloud is cross-modal to the symbolic floor plan, sites are only partially built during capture, and construction sites are visually repetitive, degrading map quality while removing distinctive features. Existing methods address at most two of these challenges. We thus introduce Reading the Room(RR), a global-local approach to register scale-ambiguous, sparse, semantic VSLAM maps to partially built floor plans. Our key idea is to define a single robust, differentiable, class-balanced semantic-geometric energy function that governs all stages of the pipeline. We develop two global initialization schemes, leveraging a single inaccurate user-provided correspondence if provided, or estimating the initialization globally using a cross-modal matching network. Both schemes are designed to find initial candidates with respect to the energy function, which is then directly optimized for local refinement. We evaluate RR on 33 sequences across three active construction sites against classical and learning-based baselines, achieving a 4.5x improvement in mean absolute trajectory error over the strongest baseline in the general unconstrained setting, which increases to 7.6x when an anchor is provided.