Cross-Modality Attention and Multimodal Fusion Transformer for Pedestrian Detection.

Pedestrian detection is an important challenge in computer vision due to its various applications. To achieve more accurate results, thermal images have been widely exploited as complementary information to assist conventional RGB-based detection. Although existing methods have developed numerous fusion strategies to utilize the complementary features, research that focuses on exploring features exclusive to each modality is limited. On this account, the features specific to one modality cannot be fully utilized and the fusion results could be easily dominated by the other modality, which limits the upper bound of discrimination ability. Hence, we propose the Cross-modality Attention Transformer (CAT) to explore the potential of modality-specific features. Further, we introduce the Multimodal Fusion Transformer (MFT) to identify the correlations between the modality data and perform feature fusion. In addition, a content-aware objective function is proposed to learn better feature representations. The experiments show that our method can achieve state-of-the-art detection performance on public datasets. The ablation studies also show the effectiveness of the proposed components.