視覚入力の復元によるVision-Language-Actionモデルのロバスト性向上
Improving Robustness of Vision-Language-Action Models by Restoring Corrupted Visual Inputs
VLAモデルは画像ノイズやレンズ汚れなどのセンサー劣化に弱いため、劣化画像からクリーンな観測を復元するプラグアンドプレイ型Transformer（CRT）を提案し、性能低下を防いだ。
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著者: Daniel Yezid Guarnizo Orjuela, Leonardo Scappatura, Veronica Di Gennaro, Riccardo Andrea Izzo, Gianluca Bardaro, Matteo Matteucci
分類: cs.CV, cs.RO
原文アブストラクト
Vision-Language-Action (VLA) models have emerged as a dominant paradigm for generalist robotic manipulation, unifying perception and control within a single end-to-end architecture. However, despite their success in controlled environments, reliable real-world deployment is severely hindered by their fragility to visual disturbances. While existing literature extensively addresses physical occlusions caused by scene geometry, a critical mode remains largely unexplored: image corruptions. These sensor-level artifacts, ranging from electronic noise and dead pixels to lens contaminants, directly compromise the integrity of the visual signal prior to interpretation. In this work, we quantify this vulnerability, demonstrating that state-of-the-art VLAs such as $\pi_{0.5}$ and SmolVLA, suffer catastrophic performance degradation, dropping from 90\% success rates to as low as 2\%, under common signal artifacts. To mitigate this, we introduce the Corruption Restoration Transformer (CRT), a plug-and-play and model-agnostic vision transformer designed to immunize VLA models against sensor disturbances. Leveraging an adversarial training objective, CRT restores clean observations from corrupted inputs without requiring computationally expensive fine-tuning of the underlying model. Extensive experiments across the LIBERO and Meta-World benchmarks demonstrate that CRT effectively recovers lost performance, enabling VLAs to maintain near-baseline success rates, even under severe visual corruption.
