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Natural image profiles are most likely to be step edges

Research output: Contribution to journalArticlepeer-review

L D Griffin, M Lillholm, M Nielsen

Original languageEnglish
Pages (from-to)407 - 421
Number of pages15
JournalVision Research
Issue number4
PublishedFeb 2004

King's Authors


We introduce Geometric Texton Theory (GTT), a theory of categorical visual feature classification that arises through consideration of the metamerism that affects families of co-localised linear receptive-field operators. A refinement of GTT that uses maximum likelihood (ML) to resolve this metamerism is presented. We describe a method for discovering the ML element of a metamery class by analysing a database of natural images. We apply the method to the simplest case-the ML element of a canonical metamery class defined by co-registering the location and orientation of profiles from images, and affinely scaling their intensities so that they have identical responses to 1-D, zeroth- and first-order, derivative of Gaussian operators. We find that a step edge is the ML profile. This result is consistent with our proposed theory of feature classification. (C) 2003 Elsevier Ltd. All rights reserved.

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