Logovit: Local-Global Vision Transformer for Object Re-Identification

Object re-identification (ReID) is prone to errors under variations in scale, illumination, complex background, and object occlusion scenarios. To overcome these challenges, attention mechanisms are employed to focus on the object's characteristics, thereby extracting better discriminative features. This paper introduces a local-global vision transformer (LoGoViT) for object re-identification by learning a hierarchical-level representation from fine-grained (local) to general (global) context features. It comprises two components: (i) shift and shuffle operations to generate robust local features and (ii) local-global module to aggregate the multi-level hierarchy features of an object. Extensive experiments show that our method achieves state-of-the-art on the ReID benchmarks. We further investigate effective augmentation operations and discuss how the patch modifications improve the proposed model's generalization under occlusion scenarios. The source code is available at https://github.com/nguyenphan99/LoGoViT.