Table 1.

Facial Analysis Algorithms.

Category	Algorithm
Appearance-based	Principal Component Analysis (PCA) Eigenface-Based Methods PCA Algorithm Kernel Principal Component Analysis (Kernel PCA) 2D-Image Principal Component Analysis (2D Image IPCA) Linear Discriminant Analysis (LDA) Discriminant Common Vectors (DCV) Independent Component Analysis (ICA) IPCA-ICA Super Vector Machine (SVM)
Feature-based	Geometric Features Local Binary Patterns (LBP) Elastic Bunch Graph Matching (EBGM) Histogram of Oriented Gradients (HoG) Elastic Bunch Graph (EBG) Hidden Markov Model (HMM)
Deep learning	Probabilistic-Decision-Based Neural Networks (PDBNN) Radial Basis Function (RBF) Convolutional Neural Network (CNN)