Table 1.

Set of features/predictors extracted from the periodic movement of the RV. A total of 7 features/predictors are calculated for both x and y coordinates. A citation for each feature is shown in the table (each link was accessed on 1 August 2021).

Feature/Predictor	MATLAB® Function
Band power [pixel]: it returns the ‘average power’ or average l2 norm (average Euclidean norm) of the input signal [pixel]	bandpower https://it.mathworks.com/help/signal/ref/bandpower.html
Power bandwidth [Hz]: it returns the 3 dB (half-power) bandwidth of the input signal	powerbw https://it.mathworks.com/help/signal/ref/powerbw.html
Occupied bandwidth [Hz]: it returns the 99% occupied bandwidth of the input signal	obw https://it.mathworks.com/help/signal/ref/obw.html
Spurious free dynamic range [dB]: it returns the SFDR of the real sinusoidal-like input signal	sfdr https://it.mathworks.com/help/signal/ref/sfdr.html
Signal to noise and distortion ratio [dB]: it returns the SINAD of the real sinusoidal-like input signal	sinad https://it.mathworks.com/help/signal/ref/sinad.html
Signal to noise ratio [dB]: it returns the SNR of the input signal	SNR https://it.mathworks.com/help/signal/ref/snr.html
Spectral entropy (information content) of the input signal	pentropy https://it.mathworks.com/help/signal/ref/pentropy.html