“…However, environmental lighting conditions and camera settings, as well as human factors (e.g., skills of the photographer), can affect the accuracy of the measurement [7,11]. Recently, several studies have been carried out based on polarized light photography, which involved combinations of polarized light, spectral modelling, digital photography and image analysis [3,7,[12][13][14]. Polarized light has the advantage of blocking the reflectance from the skin surface, such that the characteristics of the epidermal and superficial dermal layers can be observed more clearly [12].…”