【作者】 王雨朝； 罗明； 刘晓瑜； 刘海燕；

【Author】 Yuzhao Wang;Ming Ronnier Luo;XiaoYu Liu;HaiYan Liu;State Key Laboratory of Modern Optical Instrumentation,Zhejiang University;School of Design,University of Leeds;College of Science,Harbin Engineering University;Thousand Lights Lighting(Changzhou) Limited;

【机构】 中国浙江大学现代光学仪器国家重点实验室； 英国利兹大学设计学院； 中国哈尔滨工程大学理学院； 中国常州千明照明有限公司；

【摘要】 这是一项关于肤色基本特性的研究,本文主要讨论不同人种的肤色差异。本次实验共四十七名来自世界各地的自愿者参加实验,根据肤色即人种可以将他们分成四个小组:中国组,南亚组(巴基斯坦),高加索组以及深肤色组。所有的肤色都使用d:8o几何观察条件的分光光度计进行测量,得到光谱反射率形式的数据。每个被试都测量了额头,右脸颊,左脸颊,手背,拳背,手背内部以及手背外部共八个部位。通过分析这些数据,我们得到了一些人类肤色特有的性质。在L*-Cab*图像上,人类肤色的数据可以拟合成一条有特殊规律的曲线,而这条曲线和NCS所定义的黑度和白度以及Berns所定义的"深度"和"生动度"非常类似。分析结果表明中国组和高加索组有着相似的特征,日晒越多的部位明度值越低,彩度值越高,或者说更低的白度值。但与此相反,深肤色组的数据表明,明度值低的地方彩度值也低,而且数据分布在"黑度线"附近。在"白度线"与"黑度线"交点附近则是亚裔组肤色分布的地方,这些肤色有着最高的彩度值。不同人种肤色差异还表现在光谱反射率形状上。深肤色不仅意味着较低的幅值,也意味着更平缓的曲线;在浅肤色的不那么平缓的反射率曲线中有着非常明显的"W"形状。这种"W"形状是由血红素和黑色素的吸收与反射引起的。未来的工作将会试图解释这种特性产生的原因,并研究其在各个领域的应用。更多还原

【Abstract】 This study investigates the basic characteristic of human skin.47 subjects from 4groups（Chinese,Sub-Asian,Caucasian and the Dark） were recruited.All the skin colours were measured in terms of spectral reflectance using a d:8° spectrophotometer.And they included eight parts of body locations in total:forehead,right cheek,left cheek,hand back,fist back,palm,inner forearm and outer forearm.The data revealed certain pattern for human skin colour.All the data of the four skin colour groups fit a particular curve in the L^*-C_ab^* plane,and that is very similar to the definition of ’Whiteness’ and ’Blackness’ as defined by NCS,and ’Depth’ and ’Vividness’ as defined by Berns.The result also showed that,Chinese group and Caucasian group had very similar pattern:the sunburnt part of the skin had lower Lightness value and highert Chroma value,or lower whiteness.However for the Dark skin group the data shows reversed pattern:sunburn area will have higher Lightness value and higher Chroma value,and all the colours were located on the ’Blackness’ scale.The area where the ’Whiteness’ and ’Blackness’ scales cross each other,is the region for Sub-Asian,where they have the highest Chroma values.The difference for different skin colour groups also appears in the shape of spectral reflectance.Dark skin colour not only means lower amplitude,but also has a flatter curve,while for light skin colour,the spectral reflectance has a very clear ’W’ shape.’W’ shape is the feature of human skin spectral reflectance,and that is the result of the absorption and reflection of hemoglobin and melanin.Future work includes the study for the reason of the particular pattern shown in L^*-C_ab^* plane and its application in various areas.更多还原