Multilinear Modelling of Faces and Expressions

Stella Grasshof, Hanno Ackermann, Sami Sebastian Brandt, Jörn Ostermann

Publikation: Artikel i tidsskrift og konference artikel i tidsskriftTidsskriftartikelForskningpeer review

Abstrakt

In this work, we present a new versatile 3D multilinear statistical face model, based on a tensor factorisation of 3D face scans, that decomposes the shapes into person and expression subspaces. Investigation of the expression subspace reveals an inherent low-dimensional substructure, and further, a star-shaped structure. This is due to two novel findings: (1) increasing the strength of one emotion approximately forms a linear trajectory in the subspace. (2) All these trajectories intersect at a single point not at the neutral expression as assumed by almost all prior works but at an apathetic expression. We utilise these structural findings by reparameterising the expression subspace by the fourth-order moment tensor centred at the point of apathy. We propose a 3D face reconstruction method from single or multiple 2D projections by assuming an uncalibrated projective camera model. The non-linearity caused by the perspective projection can be neatly included into the model. The proposed algorithm separates person and expression subspaces convincingly, and enables flexible, natural modelling of expressions for a wide variety of human faces. Applying the method on independent faces showed that morphing between different persons and expressions can be performed without strong deformations.
OriginalsprogEngelsk
TidsskriftI E E E Transactions on Pattern Analysis and Machine Intelligence
Vol/bind43
Udgave nummer10
Sider (fra-til)3540-3554
Antal sider14
ISSN0162-8828
DOI
StatusUdgivet - 1 okt. 2021

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