Cross-modal contrastive learning with multi-hierarchical tracklet clustering for multi object tracking

The tracklet-based offline multi-object tracking (MOT) paradigm addresses the challenge of long-term association in online mode by utilizing global optimization for tracklet clustering in videos. The key to accurate offline MOT lies in establishing robust similarity between tracklets by leveraging both their temporal motion and appearance cues. To this end, we propose a multi-hierarchical tracklet clustering method based on cross- modal contrastive learning, called MHCM2DMOT. This method incorporates three key techniques: (I) A tracklet generation strategy based on motion association uniqueness, which ensures efficient object association across consecutive frames while preserving identity uniqueness; (II) Encoding tracklet motion and appearance cues through both language and visual models, enhancing interaction between different modal features via cross- modal contrastive learning to produce more distinct multi-modal fusion similarities; (III) A multi-hierarchical tracklet clustering method using graph attention network, which balances tracking performance with inference speed. Our tracker achieves state-of-the-art results on popular MOT datasets, ensuring accurate tracking performance.