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The Scientific World Journal
Volume 2014, Article ID 131605, 11 pages
http://dx.doi.org/10.1155/2014/131605
Research Article

Robust Ear Recognition via Nonnegative Sparse Representation of Gabor Orientation Information

School of Automation and Electrical Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received 21 December 2013; Accepted 18 January 2014; Published 24 February 2014

Academic Editors: S. Kobashi and A. Materka

Copyright © 2014 Baoqing Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Orientation information is critical to the accuracy of ear recognition systems. In this paper, a new feature extraction approach is investigated for ear recognition by using orientation information of Gabor wavelets. The proposed Gabor orientation feature can not only avoid too much redundancy in conventional Gabor feature but also tend to extract more precise orientation information of the ear shape contours. Then, Gabor orientation feature based nonnegative sparse representation classification (Gabor orientation + NSRC) is proposed for ear recognition. Compared with SRC in which the sparse coding coefficients can be negative, the nonnegativity of NSRC conforms to the intuitive notion of combining parts to form a whole and therefore is more consistent with the biological modeling of visual data. Additionally, the use of Gabor orientation features increases the discriminative power of NSRC. Extensive experimental results show that the proposed Gabor orientation feature based nonnegative sparse representation classification paradigm achieves much better recognition performance and is found to be more robust to challenging problems such as pose changes, illumination variations, and ear partial occlusion in real-world applications.