Gradient detection in discrete log-polar images

In a continuous sense, images and gradient operators can be mapped conformally between Cartesian and log-polar (LP) space and the process of gradient detection can be shown to be equivalent. However, gains in the efficiency of processing LP and other retino-cortical image mappings rely on variable s...

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Bibliographic Details
Published inPattern recognition letters Vol. 24; no. 14; pp. 2463 - 2470
Main Authors Wallace, A.M., McLaren, D.J.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.10.2003
Subjects
Gradient detection
Log-polar images
Log-polar images
Gradient detection
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Summary:In a continuous sense, images and gradient operators can be mapped conformally between Cartesian and log-polar (LP) space and the process of gradient detection can be shown to be equivalent. However, gains in the efficiency of processing LP and other retino-cortical image mappings rely on variable sampling with a high resolution fovea and much lower resolution towards the periphery. In this paper, we consider the implementation and evaluation of three strategies for gradient detection in a space-variant, sampled LP geometry.
ISSN:0167-8655
1872-7344
DOI:10.1016/S0167-8655(03)00091-6