3Dミラージュ:単眼深度推定における幻覚の探求と抑制
The 3D Mirage: Probing and Taming 3D Hallucinations
単眼深度基盤モデルが平面や曖昧な入力から誤った3D構造を幻覚する現象「3D Mirage」を定義し、その評価ベンチマークと指標、および幻覚領域を選択的に修正するGrounded Self-Distillationを提案した。
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著者: Hoang Nguyen, Xiaohao Xu, Xiaonan Huang
分類: cs.CV, cs.RO
原文アブストラクト
Monocular depth foundation models achieve remarkable generalization by learning large-scale semantic priors, but this creates a critical vulnerability: they hallucinate illusory 3D structures from planar/low-curvature but perceptually ambiguous inputs. We term this failure the 3D Mirage. This paper introduces a novel end-to-end framework to probe, score, and tame this under-quantified safety risk in monocular depth under context variation. To probe, we present 3D-Mirage, the first benchmark to combine context variation and precise annotation for real-world illusions with real object exclusions, multi-surface support; purpose-built to stress-test monocular depth on real-world illusions. To score, we propose a second-order magnitude-based evaluation with two metrics: the Deviation Composite Score (DCS) for high second-order 3D structure and the Confusion Composite Score (CCS) for contextual instability. To tame this failure, we introduce Grounded Self-Distillation, a parameter-efficient strategy on Depth-Anything-V2 baseline that surgically targets and resolves hallucination on illusion ROIs while preserving background knowledge, avoiding catastrophic forgetting. Our work provides an innovative pipeline for diagnosing and addressing this phenomenon, urging a necessary shift in the evaluation of MDE from pixel-wise accuracy to structural and contextual robustness.
