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. 2013 Apr 23;118:218–259. doi: 10.6028/jres.118.011

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 20 — Pupil boundary detection with the ellipse fitting method; Left image: note that (a) actual detected ellipse (b) detected pupil boundary after using longer radius. Right image: original image with the superimposed pupil boundary.