CrossWeave: 疎な2D-3D対応によるクロスモーダルなシーン・インスタンス検索
CrossWeave: Cross-Modal Scene and Instance Retrieval from Sparse 2D-3D Alignment
シーン全体や物体単位の対比学習ではなく、疎な2D-3Dパッチ・点対応の教師信号だけで学習するクロスモーダル検索フレームワークを提案し、単一モデルでシーン検索とインスタンス検索の両方でSOTAを達成した。
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?
※ AIが要旨から生成した要約です。正確性は原文をご確認ください。
著者: Aadith Warrier, Gnana Prakash Punnavajhala, Siddharth Tourani, Muhammad Haris Khan, Avinash Sharma, Madhava Krishna
分類: cs.CV
原文アブストラクト
Cross-modal scene and instance retrieval aims to retrieve a corresponding 3D environment or object given query 2D images, serving as a foundational mechanism for spatial reasoning in robotics and AR/VR. Existing methods achieve this by learning alignment only at the level of whole scenes or objects, which provides no supervision for the fine-grained local structure within them. In this work, we show that supervision on a set of sparse 2D-3D correspondences, without scene- or instance-level contrastive objectives, is sufficient to train a single model for both scene- and instance-level retrieval. Specifically, we propose $\textbf{CrossWeave}$, a novel framework for cross-modal retrieval that learns sparse patch-point alignment, which alone outperforms existing methods. An optimal transport-based aggregator over the aligned features gives further gains by clustering structurally redundant regions, freeing descriptor capacity for semantically distinct local features. CrossWeave achieves state-of-the-art performance on both scene- and instance-level retrieval on ScanNet and 3RScan with a $\textit{single model}$, whereas existing methods require separate models for each task. Our results suggest that whole-scene encoding is unnecessary for cross-modal retrieval and that sparse local correspondence supervision is a more effective and flexible alternative.