CM-DASN: Visible-Infrared Cross-Modality Person Re-Identification via Dynamic Attention Selection Network

Cross-modality person re-identification between RGB and IR images presents significant challenges due to substantial modality discrepancies. While existing approaches often focus on learning either modality-specific or modality-shared features, overemphasis on the former may hinder cross-modality matching, whereas the latter are more beneficial for this task. To address this challenge, we propose CM-DASN (Cross-Modality Dynamic Attention Selection Network), a novel approach based on dynamic attention optimization. The core of our method is the Dynamic Attention Selection Module (DASM), which adaptively selects the most effective combination of attention heads in the later stages of training, thereby balancing the learning of modality-shared and modality-specific features. We employ a softmax score-based feature selection mechanism to extract and enhance the most discriminative cross-modality feature representations. By alternating supervised learning of high-scoring modality-shared and modality-specific features in the later training stages, the model focuses on learning highly discriminative modality-shared features while retaining beneficial modality-specific information. Furthermore, we design a multi-stage, multi-scale cross-modality feature alignment strategy to more effectively learn cross-modality representations by aligning features of different scales in a phased, progressive manner. This approach considers both global structure and local details, thereby improving cross-modality person re-identification performance. Our method achieves higher cross-modality matching accuracy with minimal increases in model parameters and computational time. Extensive experiments on the SYSU-MM01 and RegDB datasets validate the effectiveness of our proposed framework, demonstrating that it outperforms most existing state-of-the-art approaches in terms of performance. The source code is available at https://github.com/hulu88/CM_DASN.