2D vs. 3D Deformable Face Models: Representational Power,Construction, and Real-Time Fitting |
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Authors: | Iain Matthews Jing Xiao Simon Baker |
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Affiliation: | (1) The Robotics Institute, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA, 15213, USA;(2) Epson Palo Alto Laboratory, Epson Research & Development, 2580 Orchard Parkway, Suite 225, San Jose, CA 95131, USA;(3) Microsoft Research, Microsoft Corporation, One Microsoft Way, Redmond, WA 98052-6339, USA |
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Abstract: | Model-based face analysis is a general paradigm with applications that include face recognition, expression recognition, lip-reading, head pose estimation, and gaze estimation. A face model is first constructed from a collection of training data, either 2D images or 3D range scans. The face model is then fit to the input image(s) and the model parameters used in whatever the application is. Most existing face models can be classified as either 2D (e.g. Active Appearance Models) or 3D (e.g. Morphable Models). In this paper we compare 2D and 3D face models along three axes: (1) representational power, (2) construction, and (3) real-time fitting. For each axis in turn, we outline the differences that result from using a 2D or a 3D face model. |
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Keywords: | Model-based face analysis 2D Active Appearance Models 3D Morphable Models representational power model construction non-rigid structure-from-motion factorization real-time fitting the inverse compositional algorithm constrained fitting |
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