LVMem: 画像拡張メモリによる長期的質問応答
LVMem: Image-Augmented Memory for Long-Horizon Question Answering
視覚ベースのメモリに画像パスを紐付け、光フローによるフレーム選択と物体中心の記述を導入することで、長期的な時空間質問応答を効率化したフレームワーク。
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著者: Victoria Khoruzhaya, Maksim Kalmykov, Tuong Do Minh, Tatiana Zemskova, Yixin Zhu, Dmitry Yudin
分類: cs.CV
原文アブストラクト
Reliable language-guided perception is essential for embodied agents, where questions about objects, events, and their locations must be answered from long observation histories. Unlike conventional visual question answering, realistic robotic settings require reasoning over extended temporal horizons and persistent scene memory. We build upon the view-based memory paradigm and propose an efficient framework for long-horizon spatio-temporal question answering. While existing view-based systems typically store either text captions or visual embeddings, we extend the ReMEmbR-style memory with image paths that link each stored description to its original visual content. To make the stored annotations more informative, we replace uniform sampling during memory construction with an optical-flow-based frame selection strategy (PSFR) and store an object-centric descriptive scene representation instead of plain captions. We further equip a VLM-based agent with an adaptive retrieval tool that returns the image associated with the most relevant caption, allowing the agent to decide when visual inspection is needed. On the OC-NaVQA benchmark, LVMem outperforms ReMEmbR on binary and positional metrics with both backbones and matches or exceeds a 4D scene graph DAAAM baseline on binary accuracy, while operating on a lightweight view-based memory that requires no explicit graph construction.