Fig. 10
From: From RGB camera to hyperspectral imaging: a breakthrough in Neolithic rock painting analysis
Separation between a complex shelter wall and pigments, and discrimination between two overlapping paintings (panel #2). a Context RGB image. b Synthetic RGB image of the HSI data (R = 600, G = 550, B = 450 nm). Right: ICA transformation of the HSI image: the 4 most significant of the 8 components containing information, the top two (e, f: ICA components #1 and 5) separates two different pigments. g Depicts an unidentified component (#2): paint or wall? h ICA component (#4) that extracts part of the complex texture of the underlying rock wall. d Synthetic RGB image using 3 ICA components (R = #5, G = #1, B = #7) displaying the different pigments (in red and green) much more clearly than the corresponding DStretch® (YWE) image (c). Scale provided by the white reference 10 cm square
