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Pupil Segmentation Using Active Contour with Shape Prior

Lookup NU author(s): Charles Ukpai, Professor Satnam Dlay, Dr Wai Lok Woo


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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.

Publication metadata

Author(s): Ukpai CO, Dlay SS, Woo WL

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Sixth International Conference on Graphic and Image Processing (ICGIP 2014)

Year of Conference: 2015

Pages: 94432J

Print publication date: 01/01/2015

Publisher: SPIE: Society of Photo-Optical Instrumentation Engineers


DOI: 10.1117/12.2180065

Library holdings: Search Newcastle University Library for this item

ISBN: 9781628415582