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Natural image profiles are most likely to be step edges

Griffin, LD; Lillholm, M; Nielsen, M; (2004) Natural image profiles are most likely to be step edges. Vision Research , 44 (4) 407 - 421. 10.1016/j.visres.2003.09.025.

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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.

Type: Article
Title: Natural image profiles are most likely to be step edges
DOI: 10.1016/j.visres.2003.09.025
Publisher version: http://dx.doi.org/10.1016/j.visres.2003.09.025
Language: English
URI: http://discovery.ucl.ac.uk/id/eprint/74195
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