# ARGOS: Who, Where, and When in Agentic Multi-Camera Person Search

Source: [ARGOS: Who, Where, and When in Agentic Multi-Camera Person Search](<https://www.sota2.com/research/paper/69df1bbf7d0172140ec7bb1b>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2026-04-16T05:00:11.996Z

Authors: Myungchul Kim, Kwanyong Park, Junmo Kim, In So Kweon

Published: 2026-04-14T14:06:19.000Z

## Abstract

We introduce ARGOS, the first benchmark and framework that reformulates multi-camera person search as an interactive reasoning problem requiring an agent to plan, question, and eliminate candidates under information asymmetry. An ARGOS agent receives a vague witness statement and must decide what to ask, when to invoke spatial or temporal tools, and how to interpret ambiguous responses, all within a limited turn budget. Reasoning is grounded in a Spatio-Temporal Topology Graph (STTG) encoding camera connectivity and empirically validated transition times. The benchmark comprises 2,691 tasks across 14 real-world scenarios in three progressive tracks: semantic perception (Who), spatial reasoning (Where), and temporal reasoning (When). Experiments with four LLM backbones show the benchmark is far from solved (best TWS: 0.383 on Track 2, 0.590 on Track 3), and ablations confirm that removing domain-specific tools drops accuracy by up to 49.6 percentage points.

## Recorded benchmark results

A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage.

- [Agentic Person Search (Spatial Reasoning) on Track 2 Spatial](<https://www.sota2.com/research/sota/agentic-person-search-spatial-reasoning-on-track-2-spatial.md>): Agentic Person Search (Spatial Reasoning); Track 2 Spatial; TWS: 38.3.

- [Agentic Person Search (Temporal Reasoning) on Track 3 Temporal](<https://www.sota2.com/research/sota/agentic-person-search-temporal-reasoning-on-track-3-temporal.md>): Agentic Person Search (Temporal Reasoning); Track 3 Temporal; TWS: 59.

- [Agentic Person Search on Track 1 (Who)](<https://www.sota2.com/research/sota/agentic-person-search-on-track-1-who.md>): Agentic Person Search; Track 1 (Who); SR@1: 81.1.

## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2604.12762>)

[PDF](<https://arxiv.org/pdf/2604.12762.pdf>)