Exploring modality-shared appearance features and modality-invariant relation features for cross-modality person Re-IDentification

Most existing cross-modality person Re-IDentification works rely on discriminative modality-shared fea-tures for reducing cross-modality variations and intra-modality variations. Despite their preliminary suc-cess, such modality-shared appearance features cannot capture enough modality-invariant discriminative information due to a massive discrepancy between RGB and IR images. To address this issue, on top of appearance features, we further capture the modality-invariant relations among different person parts (referred to as modality-invariant relation features), which help to identify persons with similar appear-ances but different body shapes. To this end, a Multi-level Two-streamed Modality-shared Feature Extrac-tion (MTMFE) sub-network is designed, where the modality-shared appearance features and modality -invariant relation features are first extracted in a shared 2D feature space and a shared 3D feature space, respectively. The two features are then fused into the final modality-shared features such that both cross -modality variations and intra-modality variations can be reduced. Besides, a novel cross-modality center alignment loss is proposed to further reduce the cross-modality variations. Experimental results on sev-eral benchmark datasets demonstrate that our proposed method exceeds state-of-the-art algorithms by a wide margin.(c) 2022 Elsevier Ltd. All rights reserved.