Expression-Invariant Representations of Faces

Authors:
A. M. Bronstein;M. M. Bronstein;R. Kimmel
Affiliations:
Dept. of Comput. Sci., Technion- Israel Inst. of Technol., Haifa;-;-
Venue:
IEEE Transactions on Image Processing
Year:
2007

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Abstract

Addressed here is the problem of constructing and analyzing expression-invariant representations of human faces. We demonstrate and justify experimentally a simple geometric model that allows to describe facial expressions as isometric deformations of the facial surface. The main step in the construction of expression-invariant representation of a face involves embedding of the facial intrinsic geometric structure into some low-dimensional space. We study the influence of the embedding space geometry and dimensionality choice on the representation accuracy and argue that compared to its Euclidean counterpart, spherical embedding leads to notably smaller metric distortions. We experimentally support our claim showing that a smaller embedding error leads to better recognition