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arXiv · 2606.01825

ROGLE: Robust Global-Local Alignment with Automated Region Supervision for Text-Based Person Search

Chaodong Jia·Zequn Xie·Xibei Jia·Sihang Cai·Shulei Wang·Tao Jin
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Abstract

Text-Based Person Search (TBPS) aims to retrieve pedestrian images using natural language queries. However, existing TBPS models, especially those based on CLIP, struggle with fine-grained understanding due to global representational bias and semantic sparsity inherited from training on short captions. This results in weak fine-grained alignment, exacerbated by the scarcity of region-level annotations. To address this, we propose ROGLE (Robust Global-Local Embedding), a unified framework that overcomes reliance on costly manual annotations through an automated Region-to-Sentence Matching (RSM) strategy. RSM automatically mines pseudo region-sentence pairs for scalable fine-grained supervision. Furthermore, ROGLE employs a multi-granular learning strategy that fuses global contrastive learning with region-level local alignment. We also introduce the P-VLG Benchmark, a large-scale dataset constructed by curating and enriching images from established public benchmarks. It features over 100,000 annotated regions and rich long-form captions, making it the first TBPS benchmark to support both global and local assessment protocols. Extensive experiments show that ROGLE significantly outperforms existing approaches, particularly on challenging long-form queries. Code and the P-VLG benchmark will be made publicly available.

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Chaodong Jia, Zequn Xie, Xibei Jia, Sihang Cai, Shulei Wang, Tao Jin. 2026-06-01. ROGLE: Robust Global-Local Alignment with Automated Region Supervision for Text-Based Person Search. https://arxiv.org/abs/2606.01825

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