CIs	color indices
ExG	Excess Green Index
GD	growth days
GI	Green Index
GIGR	green immature grains rate
GMC	grain moisture content
HLS	hue, luminance, saturation
HMC	harvest moisture content
HSV	hue, saturation, value
MAE	mean absolute error
MAPE	mean absolute percentage error
MLR	multivariate linear regression
MLP	multilayer perceptron
NDI	Normalized Difference Index
OHD	optimal harvest date
PCA	principal component analysis
QR	quick-response
RBF	radial basis function
RF	random forest
RGB	red, green, and blue
RGRI	Red–green Ratio Index
RMSE	root mean square error
RMSProp	root mean square propagation
ROI	region of interest
SSCB	simple spectral–geometric correction board
SVM	support vector machine
SVR	support vector regression
TNG67	Tainung no. 67
TNG71	Tainung no. 71
w.b.	wet basis
YOLOv4	You Only Look Once v4