Light and Skin Interactions

3.3. Techniques for Model Evaluation

In order to assess the predictive capabilities of a local light transport model, one should compare its outputs with actual measured data. Although some models provide the reflectance and transmittance as the output of a given specimen, others provide its BDF. There are also a few comprehensive models that provide both sets of radiometric data. Actual measurements of reflectance and transmittance are performed using spectrophotometers, and actual measurements of BRDF and bidirectional transmittance distribution function (BTDF) are performed using goniophotometers [119, 135]. These devices are important basic tools for fundamental research in a myriad of fields, from remote sensing to biomedical optics. In ...