StereoPatch: ロボットマニピュレーションの空間知覚のためのパッチ整合RGB-深度融合
StereoPatch: Patch-Aligned RGB-Depth Fusion for Spatial Perception in Robot Manipulation
RGBパッチと深度情報をパッチ単位で非対称クロスアテンションにより融合し、幾何学的な曖昧さを解消する視覚運動ポリシー向け表現を提案。実機6タスクで外観のみ・幾何のみ・生RGB-D・後段融合のベースラインを上回る成功率を達成。
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著者: Yanan Zhou, Zhaoyan Qian, James Zhao, Weiming Zhi
分類: cs.RO
原文アブストラクト
Recent advances in robot imitation learning have produced visuomotor policies that predict actions directly from visual observations. Yet visually similar scenes can require different actions as target position, object height, or contact geometry changes. Pretrained RGB features may map these geometrically distinct states to similar policy inputs, while simply adding depth requires the policy to learn RGB-depth correspondence from the same limited demonstrations used to learn control. We introduce StereoPatch, a patch-aligned RGB-depth representation that binds registered metric geometry directly to the RGB patches used for action prediction. On a shared 2-D patch grid, asymmetric cross-attention incorporates depth information into the corresponding RGB features before action decoding. The resulting StereoPatch Tokens provide a geometry-aware visual representation that can condition general visuomotor policies without changing their underlying learning objectives. Across six real-robot tasks, StereoPatch achieves higher closed-loop success than appearance-only, geometry-only, raw RGB-D, and late-fusion baselines. Additional experiments across three simulation suites evaluate compatibility across visuomotor policy architectures, spatial generalization, and operating limits. Results suggest that resolving control-relevant geometric ambiguity benefits from aligning depth directly with the visual features used for action prediction, rather than supplying it as an independent modality. Project page: https://aus.bot/research/stereopatch/.