Multimodal person re-identification (Re-ID) aims to match pedestrian images across different modalities. However, most existing methods focus on limited cross-modal settings and fail to support arbitrary query-retrieval combinations, hindering practical deployment. We propose FlexiReID, a flexible framework that supports seven retrieval modes across four modalities: rgb, infrared, sketches, and text. FlexiReID introduces an adaptive mixture-of-experts (MoE) mechanism to dynamically integrate diverse modality features and a cross-modal query fusion module to enhance multimodal feature extraction. To facilitate comprehensive evaluation, we construct CIRS-PEDES, a unified dataset extending four popular Re-ID datasets to include all four modalities. Extensive experiments demonstrate that FlexiReID achieves state-of-the-art performance and offers strong generalization in complex scenarios.
@article{arxiv.2510.15595,
title = {FlexiReID: Adaptive Mixture of Expert for Multi-Modal Person Re-Identification},
author = {Zhen Sun and Lei Tan and Yunhang Shen and Chengmao Cai and Xing Sun and Pingyang Dai and Liujuan Cao and Rongrong Ji},
journal= {arXiv preprint arXiv:2510.15595},
year = {2025}
}