1. Introduction  
2. Intelligent Vehicle Perception  
3. Domain Distribution Discrepancy  
3.1. Sensor Difference  
3.2. Data Difference  
3.3. Model Difference  
4. Deep Transfer Learning Methodology  
4.1. Supervised TL  
4.2. Unsupervised TL  
4.4. Domain Generalization  
4.5. Uniqueness of Methodology  
5. Challenges and Future Research  
6. Conclusion