Faculty of Technology, Electrical and Energy Engineering, University of Vaasa, P.O. Box 700, 65101 Vaasa, Finland.
J Biophotonics. 2011 Aug;4(7-8):559-64. doi: 10.1002/jbio.201000113. Epub 2010 Dec 22.
The reflectance of the skin reveals the chemical and physical changes of the skin as well as many metabolic changes. The reflectance measurement is an important method for medical diagnosis, follow-up and screening. This article concentrates on designing and validating an imaging system, based on a digital camera. The proposed system can measure the reflectance of the skin with high spatial and currently four channel spectral resolution, in the range of 450 nm to 980 nm. The accuracy of the system is determined by imaging a colour checker board and comparing the obtained values with both given values and spectrometer measurements. The diffuse interreflections of both, the integrating sphere and the lighting dome of the imaging system, is compensated with a correction factor. The accuracy of the proposed system is only slightly weaker than the spectrometer. The imaging system characteristics are independent of the camera characteristics.
皮肤的反射率揭示了皮肤的化学和物理变化以及许多代谢变化。反射率测量是医学诊断、随访和筛查的重要方法。本文专注于设计和验证一种基于数码相机的成像系统。该系统可以测量皮肤的反射率，具有高空间和当前四个通道的光谱分辨率，范围在 450nm 到 980nm 之间。系统的精度通过对彩色棋盘格成像并将获得的值与给定值和光谱仪测量值进行比较来确定。通过校正因子补偿成像系统的积分球和照明穹顶的漫反射内反射。该系统的精度仅略低于光谱仪。成像系统的特性与相机的特性无关。
