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首页> 外文期刊>Journal of dermatological science >Relationship between microstructure of the skin surface and surface reflection based on geometric optics
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Relationship between microstructure of the skin surface and surface reflection based on geometric optics

机译：基于几何光学的皮肤表面微观结构与表面反射之间的关系

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Background: The behavior of reflected light in skin affects skin appearance and provides clues as to the internal condition of the skin. Surface topography is one of the central physical factors contributing to surface reflection. Objective: We tried to clarify the relationship between microstructure of the skin surface and surface reflection based on geometric optics. Methods: Microstructures and surface reflections in the left cheeks of adult females were evaluated. Skin topography was acquired measuring replicas using confocal laser microscopy. Surface topography was used to calculate arithmetical mean deviation of the surface (S a), and geometric index from gradient of the surface (S grad), which is expected to correlate with the directionality of surface reflection (DoSR) based on geometric optics. A surface reflection image was acquired from differently polarized pictures of a face, and the index of surface reflection (I obs) was calculated as the average pixel value of the area of shine. Correlations between indices were then evaluated. Results: S grad and S a showed significant correlation (p0.01) with I obs. However, S grad showed a higher correlation with the simulated surface reflection from the reflection model than S a. In addition, S grad can explain differences in DoSR for some panelists even in the case of an identical S a. Conclusions: The topographic element involved in DoSR was extracted from height mapping. S grad reflects the ratio of flat area, offering a more effective indicator than S a for distinguishing topographic characteristics with respect to surface reflection.
机译：背景：皮肤中反射光的行为会影响皮肤外观，并提供有关皮肤内部状况的线索。表面形貌是造成表面反射的主要物理因素之一。目的：我们试图基于几何光学来阐明皮肤表面微观结构与表面反射之间的关系。方法：评估成年女性左颊的微观结构和表面反射。使用共聚焦激光显微镜术测量复制品，获取皮肤形貌。使用表面形貌来计算表面的算术平均偏差（S a），以及来自表面坡度的几何指数（S grad），这预计与基于几何光学的表面反射的方向性（DoSR）相关。从脸部的不同偏振图像获取表面反射图像，并将表面反射指数（I obs）计算为发光区域的平均像素值。然后评估指标之间的相关性。结果：S grad和S a与I obs呈显着相关性（p <0.01）。但是，S grad与来自反射模型的模拟表面反射的相关性高于S a。此外，即使在相同的S a的情况下，S grad仍可以为某些小组成员解释DoSR的差异。结论：DoSR中涉及的地形要素是从高度图中提取的。 S grad反映了平面面积的比率，它提供了比S a更有效的指标，可以区分表面反射的地形特征。

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