MUT3R: 動きを考慮した更新トランスフォーマーによる動的3D再構成
MUT3R: Motion-aware Updating Transformer for Dynamic 3D Reconstruction
事前学習済みトランスフォーマーの自己注意マップから動きの手がかりを抽出し、再学習なしで動的領域の影響を抑制してストリーミング3D再構成を安定化させる手法を提案。
詳しい要約
1. どんなもの？
2. 先行研究と比べてどこがすごい？
3. 技術・手法の肝は？
4. どうやって有効だと検証した？
5. 議論はある？
6. 次に読むべき論文は？
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著者: Guole Shen, Tianchen Deng, Xingrui Qin, Nailin Wang, Jianyu Wang, Yanbo Wang, Yongtao Chen, Hesheng Wang, Jingchuan Wang
分類: cs.CV, cs.RO
原文アブストラクト
Recent stateful recurrent neural networks have achieved remarkable progress on static 3D reconstruction but remain vulnerable to motion-induced artifacts, where non-rigid regions corrupt attention propagation between the spatial memory and image feature. By analyzing the internal behaviors of the state and image token updating mechanism, we find that aggregating self-attention maps across layers reveals a consistent pattern: dynamic regions are naturally down-weighted, exposing an implicit motion cue that the pretrained transformer already encodes but never explicitly uses. Motivated by this observation, we introduce MUT3R, a training-free framework that applies the attention-derived motion cue to suppress dynamic content in the early layers of the transformer during inference. Our attention-level gating module suppresses the influence of dynamic regions before their artifacts propagate through the feature hierarchy. Notably, we do not retrain or fine-tune the model; we let the pretrained transformer diagnose its own motion cues and correct itself. This early regulation stabilizes geometric reasoning in streaming scenarios and leads to improvements in temporal consistency and camera pose robustness across multiple dynamic benchmarks, offering a simple and training-free pathway toward motion-aware streaming reconstruction.
