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This article is part of the supplement: Seventeenth Annual Computational Neuroscience Meeting: CNS*2008

Open Access Poster presentation

A new synthetic face generation method for gender discrimination

Ali Borji

Author Affiliations

School of Cognitive Sciences, Institute for Studies in Theoretical Physics and Mathematics, Tehran, Iran

BMC Neuroscience 2008, 9(Suppl 1):P73  doi:10.1186/1471-2202-9-S1-P73

The electronic version of this article is the complete one and can be found online at: http://www.biomedcentral.com/1471-2202/9/S1/P73


Published:11 July 2008

© 2008 Borji; licensee BioMed Central Ltd.

Poster presentation

A new parametric method for generating synthetic faces is proposed in this study which could be used for psychophysics studies on face perception [1]. Two separate programs, one in Delphi 2005 programming environment and another in MATLAB® is developed to sample real faces and generating synthetic faces respectively. The user can choose to utilize default configurations or to customize specific configurations to generate a set of synthetic faces. Head-shape and inner-hairline is sampled in a polar coordinate frame, located at the center of a line connecting two eyes at 16 and 9 eqi-angular positions. Three separate frames are placed at the left eye center, nose tip and lips to sample them with 20, 30 and 44 angular points respectively. Eyebrows are sampled with 8 points in eye coordinate systems. Augmenting vectors representing these features and their distance from the origin generates a vector of size 95. For a synthesized face, intermediate points are generated using spline curves and the whole image is then band pass filtered [2]. Two experiments are designed to show that the set of generated synthetic faces matches very well with their equivalent real faces.

thumbnailFigure 1. Generating synthetic faces. Left, shows an interpolated synthetic face from sampled points. At right a number of final generated faces are shown after band pass filtering (Males are shown at top and females at bottom). It is also possible to interpolate two faces to each other and generate faces in between.

thumbnailFigure 2. Performance in a discrimination task. We designed a gender discrimination task to see whether our faces carry information needed for gender categorization. In each trail, subjects were asked to determine the face gender by pressing a button indicating male or female gender. As shown in Fig. 2, mean subjects performance in this task was 0.92 and differences between female and male targets was not significant. The subjects had no significant difference as well (P > 0.05).

Acknowledgements

We thank H.R Wilson for his helpful comments and presenting us parts of his code.

References

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    Vision Research 2002, 42:2909-2923. PubMed Abstract | Publisher Full Text OpenURL

  2. Gold J, Bennett PJ, Sekuler AB: Identification of bandpass filtered letters and faces by human and ideal observers.

    Vision Research 1999, 39:3537-3560. PubMed Abstract | Publisher Full Text OpenURL