Fig. 9.

(a) The relative mean spectrum of a selection of tiles as measured from each distance (cm) plotted against the spectrometer measurement of that tile, where each plot represents a new tile (labeled above it) as corresponding to the labels in Fig. 1(b), and (b) their respective residuals compared to the spectrometer ground truths. All distances of checkerboard data are white balanced with either the correct measured white reference or the spectral sensitivities generated from a single image of the sterile ruler.