A practical appearance model for dynamic facial color

Jorge Jimenez, Tim Weyrich, Timothy Scully, Nuno Barbosa, Craig Donner, Xenxo Alvarez, Teresa Vieira, Paul Matts, Verónica Orvalho, Diego Gutierrez
2010 ACM Transactions on Graphics  
Figure 1 : Example results of our automatic changes in skin appearance predicted by our method. Changes are due both to mechanical deformations and to involuntary dilation or constriction of blood vessels caused by emotions; all affect the skin's hemoglobin distribution. Our real-time model allows simulation of both, based on in vivo measurements of real subjects, and runs in real-time (this scene with five heads runs at 53 frames per second). Our method is easily adopted into existing
more » ... pipelines. From left to right, we show a sad smile, anger, the neutral pose, fear and disgust. The different hemoglobin maps produced by our model are shown in Figure 2 . Abstract Facial appearance depends on both the physical and physiological state of the skin. As people move, talk, undergo stress, and change expression, skin appearance is in constant flux. One of the key indicators of these changes is the color of skin. Skin color is determined by scattering and absorption of light within the skin layers, caused mostly by concentrations of two chromophores, melanin and hemoglobin. In this paper we present a real-time dynamic appearance model of skin built from in vivo measurements of melanin and hemoglobin concentrations. We demonstrate an efficient implementation of our method, and show that it adds negligible overhead to existing animation and rendering pipelines. Additionally, we develop a realistic, intuitive, and automatic control for skin color, which we term a skin appearance rig. This rig can easily be coupled with a traditional geometric facial animation rig. We demonstrate our method by augmenting digital facial performance with realistic appearance changes.
doi:10.1145/1882261.1866167 fatcat:2khd5edlhzc7jitehjrza6xgfe