Long Time No See: Benchmarking VLMs for Out-of-Sight Spatiotemporal Reasoning in Egocentric Videos

arXiv:2609.34630 · cs.CV · Submitted 2026-09-28 · Read on arXiv

cs.CV

Submitted: 2026-09-28

Updated: 2026-09-28

Terminology

• Benchmark — 30× in this paper · explained in 2 episodes
• Grounding — 26× in this paper · explained in 3 episodes
• Accuracy — 23× in this paper · explained in 1 episode
• Visual Grounding — 8× in this paper · explained in 2 episodes
• Benchmarking — 5× in this paper · explained in 3 episodes
• Computer Vision and Pattern Recognition — 5× in this paper
• Digital Twin — 4× in this paper · explained in 5 episodes
• In European Conference on Computer Vision — 4× in this paper
• Trace — 3× in this paper · explained in 2 episodes
• Failure Modes — 2× in this paper · explained in 3 episodes
• Reasoning Traces — 2× in this paper · explained in 3 episodes
• Ablation — 1× in this paper · explained in 1 episode
• Ablation study — 1× in this paper · explained in 1 episode
• Annotator Agreement — 1× in this paper · explained in 1 episode
• Consistency — 1× in this paper · explained in 3 episodes
• Fine-Tuning — 1× in this paper · explained in 5 episodes
• Foundation Model — 1× in this paper · explained in 3 episodes
• Foundation Models — 1× in this paper · explained in 7 episodes
• In International Conference on Machine Learning — 1× in this paper
• Latent Representation — 1× in this paper · explained in 2 episodes
• Latent Representations — 1× in this paper · explained in 3 episodes
• Point Clouds — 1× in this paper · explained in 2 episodes
• Prompt Engineering — 1× in this paper · explained in 4 episodes
• Temporal Reasoning — 1× in this paper · explained in 2 episodes
• Vision-Language Models (VLMs) — 1× in this paper · explained in 6 episodes
• Visual Question Answering — 1× in this paper

Sources

• Qwen3-VL Technical Report
• Qwen2.5-VL Technical Report
• Project Aria: A New Tool for Egocentric Multi-Modal AI Research
• SpaMEM: Benchmarking Dynamic Spatial Reasoning via Perception-Memory Integration in Embodied Environments
• InternVL3.5: Advancing Open-Source Multimodal Models in Versatility, Reasoning, and Efficiency
• EgoMemReason: A Memory-Driven Reasoning Benchmark for Long-Horizon Egocentric Video Understanding
• Set-of-Mark Prompting Unleashes Extraordinary Visual Grounding in GPT-4V

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