1 INTRODUCTION

2 RELATED TASKS  
2.1 Single Object Tracking  
2.2 Video Object Detection  
2.3 Re-Identification  

3 A TAXONOMY OF MOT EMBEDDING METHODS  
3.1 Patch-Level Box Image Embedding  
3.2 Single-Frame Detection Embedding  
3.3 Cross-Frame Joint Embedding  
3.4 Correlation-Based Embedding  
3.5 Sequential Embedding  
3.6 Tracklet Embedding  
3.7 Cross-Track Relational Embedding  

4 BENCHMARKS AND ANALYSIS  
4.1 Evaluation Metrics  
4.2 In-Depth Analysis on State-of-the-Art Methods  

5 FUTURE DIRECTIONS OF MOT EMBEDDING  
5.1 Under-Investigated Areas  
5.2 Towards Future Embedding Learning in MOT  

6 CONCLUSION