1 Introduction

2 What is Video Super-Resolution

3 Evaluation Metrics  
3.1 Full-Reference IQA (FR-IQA) Metrics  
3.2  

4 Optical Flow Based VSR  
4.1 Motion Compensation  

5 Temporal Dependency Capturing for VSR with OF  
5.1 Reconstruction based VSR Method  
5.2 Learning based VSR Method  
5.3 Deep Learning based VSR Method  

6 Challenge and Future Direction  
6.2  

7 Conclusion