Investigating a two stage facial expression rating and classification technique

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Abstract

In this paper, a two stage facial expression rating and classification technique for facial is proposed, as the intensity of an emotion evolves from neutral to high expression. The face is modeled as a combination of sectors and their boundaries. An expression change in a face is characterised and quantified through a combination of non-rigid deformations. After elastic interpolation, this yields a geometry-based high-dimensional 2D shape transformation, which is used to register regions defined on query-faces. This shape transformation produces a vector-valued deformation field and is used to define a scalar valued Sector Volumetric Difference (SVD) function, which characterises and quantifies the facial expression. A two-stage expression classification is used with first stage detecting low, medim and high levels of expressions, and the second stage involving a HMM-classifier for recognizing six different facial emotions-anger, disgust, fear, happiness, sadness and surprise. Further, the proposed shape transformation approach is compared with marker based extraction method for extracting facial expression features. The performance evaluation done on a Italian audiovisual emotion database DaFex[l,2], comprising facial expression data from several actors eliciting five different emotions - anger, disgust, fear, happiness, sadness and surprise at different intensities (low, medium and high), shows a significant improvement in expression classification for the proposed shape-transfonnation approach.

Original languageEnglish
Title of host publicationProceedings of the 2008 2nd International Conference on Signal Processing and Communication Systems (ICSPCS 2008)
PublisherIEEE
ISBN (Print)9781424442423
DOIs
Publication statusPublished - 15 Dec 2008
Externally publishedYes
Event2nd International Conference on Signal Processing and Communication Systems, ICSPCS 2008 - Gold Coast, QLD, Australia
Duration: 15 Dec 200817 Dec 2008

Conference

Conference2nd International Conference on Signal Processing and Communication Systems, ICSPCS 2008
CountryAustralia
CityGold Coast, QLD
Period15/12/0817/12/08

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Chetty, G. (2008). Investigating a two stage facial expression rating and classification technique. In Proceedings of the 2008 2nd International Conference on Signal Processing and Communication Systems (ICSPCS 2008) [4813754] IEEE. https://doi.org/10.1109/ICSPCS.2008.4813754