Evaluating visibility of age spot and freckle based on simulated spectral reflectance distribution and facial color image

Misa Hirose Saori Toyota, Norimichi Tsumura

Optical Review 2017 (accepted)

Abstract
In this research, we evaluate the visibility of age spot and freckle with changing the blood volume based on simulated spectral reflectance distribution and the actual facial color images and compare these results. First, we generate three type of spatial distribution of age spot and freckle in patch like images based on the simulated spectral reflectance. The spectral reflectance is simulated by using Monte Carlo simulation of light transport in multi-layered tissue. Next, we reconstruct the facial color image with changing the blood volume. We acquire the concentration distribution of melanin, hemoglobin and shading components by applying the independent component analysis on a facial color image. We reproduce images by using the obtained melanin and shading concentration and the changed hemoglobin concentration. Finally, we evaluate the visibility of pigmentations using simulated spectral reflectance distribution and facial color images. In the result of simulated spectral reflectance distribution, we found that the visibility became lower as the blood volume increases. However, we can see that a specific blood volume reduce the visibility of the actual pigmentations from the result of the facial color images.

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