The following abbreviations are used in this manuscript:
AIM-FAS	Adaptive Inner-update Meta Face Anti-spoofing
AUC	Area Under Curve
BASN	Bipartite Auxiliary Supervision Network
BS	Background Subtraction
CDC	Central Difference Convolution
CDCN	Central Difference Convolutional Network
CM	CASIA MSU
CNN	Convolutional Neural Networks
CR	CASIA Replay
DET	Detection Error Tradeoff
DMD	Dynamic Mode Decomposition
DTN	Deep Tree Network
EER	Equal Error Rate
FAS	Face Anti-Spoofing
FC	Fully Connected
GT	Ground Through
HTER	Half Total Error Rate
IDA	Image Distortion Analysis
IQA	Image Quality Assessment
LBP	Local Binary Patterns
LBP-TOP	Local Binary Pattern on Three Orthogonal Planes
MC	MSU CASIA
MEGC	Multiple Explainable and Generalizable
MFRM	Multi-level Feature Refinement Module
MR	MSU Replay
MV	Majority Vote
RC	Replay CASIA
RM	Replay MSU
STASN	Spatiotemporal Anti-Spoof Network
SVM	Support Vector Machines
USDAN	Unsupervised and Semi-supervised Domain Adaptation Network