Acronym	Expansion
CHI	Chi-square feature selection
CNN	Convolutional neural networks
CoOC	Deep co-occurrence of deep representation
Conv	Convolutional layer
DCT	Discrete cosine transform
FC	Fully connected layer
GEP	Global entropy pooling
GMTP	Global mean thresholding pooling
LBPCHI	LBP combined with chi-square feature selection is labeled LB
LBP	Local binary patterns
PCA	Principal component analysis
SIFT	Scale invariant feature transform
SFFS	Sequential forward floating selection
SVM	Support vector machine
TEM	Transmission electron microscopy