Practical modeling and acquisition of layered facial...

A - Human Necessities – 61 – B

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A61B 5/103 (2006.01) G06F 17/10 (2006.01) G06T 17/00 (2006.01)

Patent

CA 2714562

Techniques are described for modeling layered facial reflectance consisting of specular reflectance, single scattering, and shallow and deep subsurface scattering. Parameters of appropriate reflectance models can be estimated for each of these layers, e.g., from just 20 photographs recorded in a few seconds from a single view-point. Spatially-varying specular reflectance and single-scattering parameters can be extracted from polarization-difference images under spherical and point source illumination. Direct-indirect separation can be employed to decompose the remaining multiple scattering observed under cross-polarization into shallow and deep scattering components to model the light transport through multiple layers of skin. Appropriate diffusion models can be matched to the extracted shallow and deep scattering components for different regions on the face. The techniques were validated by comparing renderings of subjects to reference photographs recorded from novel viewpoints and under novel illumination conditions. Related geometry acquisition systems and software products are also described.

L'invention porte sur des techniques de modélisation de la réflectance faciale en couches utilisant la réflectance spéculaire, la diffusion simple et la diffusion subsurfacielle superficielle et profonde. On peut estimer les paramètres de modèles de réflectance appropriés pour chacune de ces couches, par exemple à partir de seulement 20 photos prises en quelques secondes depuis un seul point de vue. On peut extraire d'images de polarisation différente prises sous des sources d'éclairage sphériques ou ponctuelles, des paramètres de réflectance spéculaire et de diffusion simple variant dans l'espace. On peut utiliser une séparation directe-indirecte pour décomposer, dans des conditions de polarisation croisée, les multiples diffusions restantes observées, en composantes de diffusion superficielle et profonde pour modéliser le transport de lumière à travers les différentes couches de la peau. Les modèles de diffusion appropriés peuvent être adaptés aux composantes de diffusion superficielle et profonde de différentes zones de la face. Ces techniques ont été validées en comparant les rendus de sujets à des photographies de référence prises d'un nouveau point de vue et dans de nouvelles conditions d'éclairage. L'invention porte également sur les systèmes et logiciels associés d'acquisition de géométrie.

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