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. 2014 Jul 24;9(7):e98424. doi: 10.1371/journal.pone.0098424

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© 2014 Azzopardi et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(First row) Images of objects in natural scenes taken from the RuG data set. (Second row) The corresponding contour maps hand drawn by a person. Best contour maps obtained by (third row) the proposed push-pull CORF model, (fourth row) the basic CORF model without inhibition, (fifth row) the Gabor filter model with isotropic surround inhibition, (sixth row) the Gabor energy model with isotropic surround inhibition and by (seventh row) the classical Canny edge detector.