Ezerskaia Anna, Ras Arno, Bloemen Pascal, Pereira Silvania F, Urbach H Paul, Varghese Babu
Department of Personal Care and Wellness, Philips Research, 5656AE, Eindhoven, the Netherlands.
Optics Research Group, ImPhys Department, TNW Faculty, Delft University of Technology, Lorentzweg 1, Delft 2628 CJ, the Netherlands.
Biomed Opt Express. 2017 Aug 7;8(9):3981-3992. doi: 10.1364/BOE.8.003981. eCollection 2017 Sep 1.
We demonstrate a low-cost optical method for measuring the gloss properties with improved sensitivity in the low gloss regime, relevant for skin gloss properties. The gloss estimation method is based on, on the one hand, the slope of the intensity gradient in the transition regime between specular and diffuse reflection and on the other on the sum over the intensities of pixels above threshold, derived from a camera image obtained using unpolarized white light illumination. We demonstrate the improved sensitivity of the two proposed methods using Monte Carlo simulations and experiments performed on ISO gloss calibration standards with an optical prototype. The performance and linearity of the method was compared with different professional gloss measurement devices based on the ratio of specular to diffuse intensity. We demonstrate the feasibility for in-vivo skin gloss measurements by quantifying the temporal evolution of skin gloss after application of standard paraffin cream bases on skin. The presented method opens new possibilities in the fields of cosmetology and dermatopharmacology for measuring the skin gloss and resorption kinetics and the pharmacodynamics of various external agents.
我们展示了一种低成本的光学方法，用于在低光泽度范围内测量光泽特性，且具有更高的灵敏度，这与皮肤光泽特性相关。该光泽度估计方法一方面基于镜面反射和漫反射之间过渡区域的强度梯度斜率，另一方面基于从使用非偏振白光照明获得的相机图像中得出的阈值以上像素强度之和。我们通过蒙特卡罗模拟以及在带有光学原型的ISO光泽度校准标准上进行的实验，证明了所提出的两种方法具有更高的灵敏度。基于镜面与漫反射强度之比，将该方法的性能和线性与不同的专业光泽度测量设备进行了比较。通过量化在皮肤上涂抹标准石蜡乳膏后皮肤光泽度的时间演变，我们证明了体内皮肤光泽度测量的可行性。所提出的方法在美容学和皮肤药理学领域为测量皮肤光泽度、吸收动力学以及各种外用剂的药效学开辟了新的可能性。
