Fig. 13
From: From RGB camera to hyperspectral imaging: a breakthrough in Neolithic rock painting analysis
Highlighting invisible figures on complex rock wall (panel #3). a Original context RGB image. Right d, e, f: ICA transformation of the HSI image: the 3 most significant of the 7 components with information (ICA components #7, 2 and 5) clearly separating three different pigments. c Synthetic RGB image of the HSI data using the 3 ICA components (R = #7, G = #5, B = #2) displaying the different pigments. The large anthropomorphs are mostly invisible in the corresponding DStretch® (YUV) image (b), only the ‘elongated head’ of the main anthropomorph can be barely recognized a posteriori. Scale provided by the white reference 10 cm square. The rectangle in the image b locates the high-resolution image of Fig. 14
