Pupil segmentation using active contour with shape prior

Charles O. Ukpai; Satnam S. Dlay; Wai L. Woo

doi:10.1117/12.2180065

4 March 2015 Pupil segmentation using active contour with shape prior

Charles O. Ukpai, Satnam S. Dlay, Wai L. Woo

Proceedings Volume 9443, Sixth International Conference on Graphic and Image Processing (ICGIP 2014); 94432J (2015) https://doi.org/10.1117/12.2180065
Event: Sixth International Conference on Graphic and Image Processing (ICGIP 2014), 2014, Beijing, China

Abstract

Iris segmentation is the process of defining the valid part of the eye image used for further processing (feature extraction, matching and decision making). Segmentation of the iris mostly starts with pupil boundary segmentation. Most pupil segmentation techniques are based on the assumption that the pupil is circular shape. In this paper, we propose a new pupil segmentation technique which combines shape, location and spatial information for accurate and efficient segmentation of the pupil. Initially, the pupil’s position and radius is estimated using a statistical approach and circular Hough transform. In order to segment the irregular boundary of the pupil, an active contour model is initialized close to the estimated boundary using information from the first step and segmentation is achieved using energy minimization based active contour. Pre-processing and post-processing were carried out to remove noise and occlusions respectively. Experimental results on CASIA V1.0 and 4.0 shows that the proposed method is highly effective at segmenting irregular boundaries of the pupil.

Citation Download Citation

Charles O. Ukpai, Satnam S. Dlay, and Wai L. Woo "Pupil segmentation using active contour with shape prior", Proc. SPIE 9443, Sixth International Conference on Graphic and Image Processing (ICGIP 2014), 94432J (4 March 2015); https://doi.org/10.1117/12.2180065

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