Abstract
Under the different light irradiation, the reflective and scattering intensity of skin image can be applied to evaluate many human health indices, such as oxygen saturation in blood, skin tissue aging or skin lesions (leukoplakia, turmoil cell, and so on). Due to the different absorption and scattering rate of skin illustrated by a variety of LED light source, we can perform the processing and analysis of skin surface images. Since the surface roughness is more sensitive to the shorter wavelength light source (430 nm and 470 nm LED), so the difference of reflective light image can be used to detect the skin roughness. In addition, the oxygenated hemoglobin (HbO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) in blood has a relatively high absorption rate at green (570 nm) and near-infrared (940 nm) light, so it can be used to compute the oxygen saturation. In this study, based on the different light absorption of HbO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> in blood, there are six light sources (deep blue, blue, green, deep red, NIR, white light) would be applied to the inspection of skin characteristics. The processed images provide better reference for the follow-up studies on the oxygen saturation of peripheral blood and skin aging.
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