A R T I C L E I N F O  
A B S T R A C T  
1. Introduction  
1.1. Motivation and Related Surveys  
1.2. Contribution  
1.3. Organisation of the Survey  
2. Overview of Person Re-Identification  
3. Unsupervised Person Re-Identification  
3.1. Pseudo-Label Estimation  
3.2. Deep Feature Representation Learning  
3.3. Camera-Aware Invariance Learning  
3.4. Unsupervised Domain Adaptation  
4. Datasets and Evaluation  
4.1. Datasets  
4.2. Evaluation Metrics  
4.3. Performance Analysis  
5. Discussion and Future Directions  
6. Conclusion