An Introduction to Light Interaction with Human Skin

Despite the notable progress in physically-based rendering, there is still a long way to go before one can automatically generate predictable images of organic materials such as human skin. In this tutorial, the main physical and biological aspects involved in the processes of propagation and absorption of light by skin tissues are examined. These processes affect not only skin appearance, but also its health. For this reason, they have also been the object of study in biomedical research. The models of light interaction with human skin developed by the biomedical community are mainly aimed at the simulation of skin spectral properties which are used to determine the concentration and distribution of various substances. In computer graphics, the focus has been on the simulation of light scattering properties that affect skin appearance. Computer models used to simulate these spectral and scattering properties are described in this tutorial, and their strengths and limitations discussed. Keywords: natural phenomena, biologically and physically-based rendering

On the predictive modeling of visible light interaction with fresh and environmentally stressed monocotyledonous leaves.

ABSTRACT The author has recently proposed a model to simulate light interactions with monocotyledonous (unifacial) leaves in the infrared domain. In this paper, we evaluate the applicability of this model to simulations performed in the visible (photosynthetic) domain, and aimed at the investigation of biophysical responses triggered by nutrient and water stress. The model's fidelity and predictability in this spectral domain are assessed through quantitative and qualitative comparisons of modeled results with measured data obtained for maize specimens. Its predictive capabilities are further demonstrated through the simulation of reflectance profiles resulting from experiments involving maize leaves under different water reduction procedures

Modeling the interaction of infrared radiation (750–2500nm) with bifacial and unifacial plant leaves. Remote Sensing of Environment 100

Abstract Plants are arguably among the most investigated remote sensing targets. Due to their economical and environmental importance, several models to simulate radiation transport and absorption by foliar tissues have been proposed in remote sensing and related fields. The main goal of this research is to present alternative modeling strategies for the investigation of these phenomena. These solutions consist in algorithmic models specifically designed to simulate the interaction of radiation with bifacial and unifacial plant leaves. Their flexible formulations based on standard Monte Carlo techniques make their implementation straightforward and allow their use in investigations involving different regions of the electromagnetic spectrum of radiation. In this paper, they are examined in the context of infrared applications. This choice is motivated by the simulation challenges posed by the processes that relate biophysical characteristics to optical properties of plant leaves in this domain. The accuracy and predictability of the proposed models have been evaluated through comparisons between modeled results and measured data. The results of these evaluations illustrate the applicability of the proposed models to investigations involving the predictive simulation of foliar spectral signatures.

Light & Skin Interactions: Simulations for Computer Graphics Applications

Light and Skin Interactions immerses you in one of the most fascinating application areas of computer graphics: appearance simulation. The book first illuminates the fundamental biophysical processes that affect skin appearance, and reviews seminal related works aimed at applications in life and health sciences. It then examines four exemplary modeling approaches as well as definitive algorithms that can be used to generate realistic images depicting skin appearance. An accompanying companion site also includes complete code and data sources for the BioSpec model, which is considered to be th

– Scattering model – Natural phenomena –

Efficiently simulating scattering of light by leave