Table 2.

MedAPE (3sf) in the spectral sensitivities and in the pixel-by-pixel percentage errors (3sf) between the synthetic reference generated from a video of the sterile ruler and the reflectivity corrected Spectralon reference for each distance, alongside the mean NRMSE (3sf) when balancing with each synthetic reference for the quantitative and relative datasets for the mean measured spectrum of each tile compared to its spectrometer measurement, alongside the median pixel-by-pixel $\mathrm{\Delta }E$ value (3sf) between the composite checkerboard CIELAB reconstruction and the literature values.

Distance (cm)	MedAPE (%)		NRMSE		$\mathrm{\Delta }E$
	$S_n$	Pixel-by-pixel	Quantitative (%)	Relative (a.u.)
20	0.166	2.37	0.148	0.0516	7.60
23	0.219	2.37	0.164	0.0557	7.77
25	0.167	3.20	0.137	0.0478	8.29
28	0.141	2.61	0.163	0.0538	7.32
30	0.165	2.36	0.125	0.0395	8.69
33	0.151	2.39	0.125	0.0393	8.84
35	0.494	6.38	0.117	0.0368	8.69