Fig. 3.

The image acquisition and extraction of blood and melanin absorption information content from hyperspectral reconstruction with the RGB image from a smartphone camera with illumination from built-in flashlight. (a) Photography during image acquisition with the smartphone camera and built-in flashlight. (b) Initial RGB-mode image of the facial skin captured by the smartphone camera. (c) Blood absorption information map. (d) Melanin absorption information map. Red arrow: skin redness; Black arrow: moles. Blood and melanin absorption maps are coded according to the color bar shown in the right.