CV	Computer vision
CMS	Crowd Monitoring System
CCTV	Closed-circuit television
CNNs	Convolutional neural networks
DCNNs	Deep convolutional neural networks
GLCM	gray level co-occurrence matrices
HoG	Histogram of oriented gradients
IoT	Internet of Things
KLT	Kanade Lucas Tomasi
LBP	Local binary pattern
SVM	Support vector machine
MAE	Mean absolute error
MSE	Mean square error
RF	Random forest
SIFT	Scale Invariant Feature Transform
SOA	State of the art
TMLMs	Traditional machine learning methods
UAVs	Unmanned Aerial Vehicles