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Grammatical facial expression recognition in sign language discourse: a study at the syntax level

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Abstract

Facial Expression Recognition is an already well-developed research area, mainly due to its applicability in the construction of different system types. Facial expressions are especially important in the area which relates to the construction of discourses through sign language. Sign languages are visual-spatial languages that are not assisted by voice intonation. Therefore, they use facial expressions to support the manifestation of prosody aspects and some grammatical constructions. Such expressions are called Grammatical Facial Expressions (GFEs) and they are present at sign language morphological and syntactic levels. GFEs stand out in automated recognition processes for sign languages, as they help removing ambiguity among signals, and they also contribute to compose the semantic meaning of discourse. This paper aims to present a study which applies inductive reasoning to recognize patterns, as a way to study the problem involving the automated recognition of GFEs at the discourse syntactic level in the Libras Sign Language (Brazilian Sign Language). In this study, sensor Microsoft Kinect was used to capture three-dimensional points in the faces of subjects who were fluent in sign language, generating a corpus of Libras phrases, which comprised different syntactic constructions. This corpus was analyzed through classifiers that were implemented through neural network Multilayer Perceptron, and then a series of experiments was conducted. The experiments allowed investigating: the recognition complexity that is inherent to each of the GFEs that are present in the corpus; the use suitability of different vector representations, considering descriptive characteristics that are based on coordinates of points in three dimensions, distances and angles therefrom; the need for using time data regarding the execution of expressions during speech; and particularities that are connected to data labeling and the evaluation of classifying models in the context of a sign language.

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Notes

  1. Available at https://archive.ics.uci.edu/ml/datasets/Grammatical+Facial+Expressions https://archive.ics.uci.edu/ml/datasets/Grammatical+Facial+Expressions – UCI Machine Learning Repository (Lichman 2013).

  2. NMMs are characterized by head positions and movements, body position and movements, looks, and FEs.

  3. Notation indicating that the interrogative facial expression (WH-question) was used in the whole phrase. Symbols <> mark the period in which that expression is executed.

  4. It was not applied in this study.

  5. http://www.bu.edu/asllrp/cslgr/.

  6. A device that is capable of capturing RGB images which hold depth information, and also of capturing acoustic information (http://msdn.microsoft.com/en-us/library/hh855347.aspx).

  7. http://msdn.microsoft.com/en-us/library/jj130970.aspx.

  8. This parameter assumes different values in each experiment, always considering the shortest time for the execution of an expression in the phrases. Therefore, it prevents a “window” from being large enough to contain frames which represent: non-expression – expression – non-expression.

  9. There are no elements in this study to allow for evaluating whether this GFE is more difficult to be labeled by human labelers, or if it is difficult for a classifier to interpret the transition phase between non-expression – expression – non-expression.

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Authors and Affiliations

  1. School of Arts, Sciences and Humanities, University of Sao Paulo, Sao Paulo, Brazil

    Fernando A. Freitas, Sarajane M. Peres & Clodoaldo A. M. Lima

  2. Faculty of Philosophy, Languages and Literature, and Human Sciences, University of Sao Paulo, Sao Paulo, Brazil

    Felipe V. Barbosa

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  1. Fernando A. Freitas
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  2. Sarajane M. Peres
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Correspondence to Sarajane M. Peres.

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Freitas, F.A., Peres, S.M., Lima, C.A.M. et al. Grammatical facial expression recognition in sign language discourse: a study at the syntax level. Inf Syst Front 19, 1243–1259 (2017). https://doi.org/10.1007/s10796-017-9765-z

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