Channel-Wise Spatiotemporal Aggregation Technology for Face Video Forensics

Algorithm 1

The CWSA algorithm.

Require: Training face video clips ; Corresponding label .

1: for each do

2:  Decompose into the sequence of frames ;

3:  Detect and crop faces frames from , then denote them as ;

4: end for

5: Feed into the backbone, producing a set of feature maps ;

6: Decompose into ;

7: Combine by going through and stacking that has the equal , producing ;

8: Feed into weights-sharing classifier, producing ;

9: Calculating binary classification error between and ;

10: Update the parameters of the model by back propagation;

Ensure: Optimal model for fake face detection