動く前に探索方針を決める:拡散モデル生成の探索参照を用いた半静的環境でのゼロショット物体ナビゲーション
Decide Before You Move: Diffusion-Generated Search Reference for Zero-Shot Open-Vocabulary Object Navigation in Semi-Static Environments
半静的環境で、LLMによる物体共起事前分布と拡散モデルで移動前に探索経路の参照を生成し、VLMを毎ステップ呼ばずにゼロショットで目的物体を探すObjectNav手法を提案。
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著者: Yuxuan Feng, Fujing Xie, Sören Schwertfeger, Hermann Blum
分類: cs.RO
原文アブストラクト
Open-world navigation requires a robot to locate a user-specified target in an indoor scene under open-vocabulary queries. Realistic indoor environments are semi-static: walls and furniture largely persist while smaller objects move, relocate, or vanish between visits. Prior-map systems answer queries from object poses recorded at reconstruction time, which expire as soon as objects move, whereas online methods re-derive where to look from current observations every few steps, often through expensive calls to a vision--language model. Assuming that walls and large furniture do not move, we keep their map to plan paths, but use a target--furniture co-occurrence prior to decide where to search. We present PreNav, an ObjectNav framework on semi-static environments. Rather than invoking a vision-language model at each step, PreNav generates a single global search reference before the robot moves: an LLM converts target--furniture co-occurrence into a spatial prior, a conditional diffusion model turns that prior and the persistent structure into an ordered centerline with a band around it, and the robot approaches the target once it is detected online. Experiments on a Gibson ObjectNav benchmark show that PreNav outperforms a strong online baseline under matched structural priors, using a generator trained only on room-level ScanNet++ scenes and applied to floor-level Gibson without fine-tuning. Real-world experiments under object relocation and open-vocabulary queries further validate the approach.
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