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. 2014 Nov 6;11(100):20140698. doi: 10.1098/rsif.2014.0698

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© 2014 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 3. — Contact area contour estimation. (a) Raw image of the fingerpad in contact with the glass. (b) Estimated contour in blue. (c) Fitted ellipse in red. (d) Error measurement between raw contour and ellipse fit (filled in grey).