RGB-D	Red Green Blue-Depth
3DWF	3D Wide Faces
Multi-PIE	Multi Pose Illumination Expression
3DU	3DUniversum
3DMM	3D Morphable Model
MRF	Markov Random Field
CNN	Convolutional Neural Network
USB	Universal Serial Bus
LED	Light-Emitting Diode
STD	Standard Deviation
MAD	Median Absolute Deviation
AFLW	Annotated Facial Landmarks in theWild Dataset
RCN	Recombinator Networks
ReLU	Rectifier Linear Unit
RANSAC	Random Sample Consensus
ICP	Iterative Closest Point
ROI	Region Of Interest
CIELAB	color space defined by the International Commission on Illumination (CIE)
CIEDE2000	color difference defined by the International Commission on Illumination (CIE)
SVD	Single Value Decomposition
LDA	Linear Discriminant Analysis
GNB	Gaussian Naive Bayes