AHBR	Active-Hough-Based Retrieval
BoVW	Bag of Visual Words
CEDD	Color and Edge Directivity Descriptor
CNN	Convolutional Neural Network
DF	Distortion Free
DNN	Deep Neural Network
FAST	Features from Accelerated Segment Test
FPS	Frames per Second
GN	Gaussian Noise
GPU	Graphics Processing Unit
HBR	Hough-Based Retrieval
HSV	Hue Saturation Value
IMU	Inertial Measurement Unit
MB	Motion Blur
MI	Mutual Information
MPEG	Moving Picture Experts Group
UAV	Unmanned Aerial Vehicle
UB	Uniform Background
RGB-D	Red Green Blue—Depth
RMSE	Root Mean Square Error
SIFT	Scale Invariant Feature Transform
SLAM	Simultaneous Localization and Mapping
SURF	Speeded Up Robust Features
TB	Textured Background