Evaluation of Pigmentation by Multispectral Image Analysis(Second Report). Reconstruction of Pigmented Images Based Only on the Melanin Component in the Skin.:Reconstruction of Pigmented Images Based Only on the Melanin Component in the Skin

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Conventional digitized images of pigmented skin include both coloring caused by melanin and coloring contributed by other skin factors. To accurately quantify the darkness of pigmented skin, only melanin should be considered. Coefficients for weighting M1 and M2 for the reflected light constituent factors V1 and V2 derived from the spectral reflectance data of the skin indicate the amount of melanin in the stratum basale and that above the stratum basale, respectively. The authors have devised a method for separating coloring caused by melanin at different depths from the skin surface and for displaying the degree of coloration at each depth as a separate image. The average brightness of a pigmented region was calculated based only on the melanin component and defined as the average pigmentation density. To represent the brightness-related frequency distribution of pixels in a digitized image, a new method employing two parameters was developed. Using this method to display the melanin profile in skin, it is possible to represent the pigmentation condition in images having equal average pigmentation densities but different frequency distributions of brightness.
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