Classifying faces

Details Classifying faces Classifying faces

1994-10-24

1996-10-01

Boudreau, Leo

Image analysis

Applications

Personnel identification

382203, 382224, 382276, G06K 900

Patent

active

055617182

ABSTRACT:
A face classification system which receives video data representative of a scene and extracts therefrom data representative of a face which is present in the scene. The facial video data is applied to a homomorphic filter to eliminate the effects of lighting changes in the scene. The positions of the eyes and mouth are located to form two sub-divisions, one in relation to a first line joining the eyes and the other in relation to a second line perpendicular to the first line and passing through the nose. A feature vector which is representative of the face and is rotation, scaling, translation and grey level intensity invariant is then produced by applying a recursive second order sub-division of moments to the filtered data. Such sub-division of moments is constrained to act first on the sub-divisions formed by the aforesaid lines, thereby reducing the effect of noise. The feature vector may be applied to a classifier which employs multi-layer perception to compare it with stored feature vectors of faces in one or more previous scenes to determine if the faces match. The system may be used, for example, for allowing access to secure areas or to secure computer work stations.

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"A Transformation Invariant Recursive Subdivision Method for Shape Analysis" Zhu et al, IEEE Proceedings of the 9th International Conference on Pattern Recognition, vol. 2, Nov. 17, 1988 pp. 833-835.
"A New Filter Structure for the Implementation of Certain Classes of Image Processing Operations" Pitas et al, IEEE Transactions on Circuits and Systems vol. 35, no. 6, Jun. 1988, pp. 636-647.
"Finding Face Features" Craw et al, Proceedings of the Second European Conference on Computer Vision, ECCV'92 May 23, 1992, pp. 92-96.
L. Sirovich and M. Kirby, "Low-dimensional procedure for the characterization of human faces", Optical Society of America, vol. 4, pp. 519-524, Mar. 1987.

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