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Towards a spatio-temporal appearance model for human skin

Published: 29 October 2010 Publication History

Abstract

In this talk, I will present latest results in modelling the unique reflectance properties of human skin and techniques to acquire appearance parameters for such reflectance models. The main focus will be on recent developments that focus on spatial and temporal variations in skin appearance.
At the core lies a novel multi-layered, heterogeneous spectral reflectance model for human skin. The model captures the inter-scattering of light among layers, each of which may have an independent set of spatially-varying absorption and scattering parameters. For greater physical accuracy and control, we introduce an infinitesimally thin absorbing layer between scattering layers. To obtain parameters for our model, we use a novel acquisition method that begins with multi-spectral photographs. By using an inverse rendering technique, along with known chromophore spectra, we optimise for the best set of parameters for each pixel of a patch. Our model can be applied to faithfully reproduce complex skin appearance due to variations in skin pigmentation. This is in contrast to most previous work, which assumes that skin is homogeneous or composed of homogeneous layers. I will demonstrate the accuracy and flexibility of our model by creating complex skin visual effects such as veins, tattoos, rashes, and freckles, which would be difficult to author using only colour textures at the skin's outer surface.
By varying the parameters of our model, we can simulate effects from external forces, such as visible changes in blood flow within the skin due to external pressure. To analyse the importance of such changes in blood perfusion for the appearance of human faces, we analysed spatio-temporal variations of blood concentrations across different facial expressions. From these measurements we derive parameters for a novel dynamic appearance model that provides realistic, intuitive, and automatic control for skin colour, a skin appearance rig. Our method is easily be coupled with a traditional (geometric) facial animation rig. This can be used, for example, to augment digital facial performance with realistic appearance changes. I will demonstrate an efficient implementation of our method, and show that it adds negligible overhead to existing animation and rendering pipelines.

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Published In

cover image ACM Conferences
SMVC '10: Proceedings of the 2010 ACM workshop on Surreal media and virtual cloning
October 2010
76 pages
ISBN:9781450301756
DOI:10.1145/1878083

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Association for Computing Machinery

New York, NY, United States

Publication History

Published: 29 October 2010

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Author Tags

  1. 3d representation
  2. processing and coding

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  • Keynote

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MM '10
Sponsor:
MM '10: ACM Multimedia Conference
October 29, 2010
Firenze, Italy

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