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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Stephen A. Burns
  • Vol. 25, Iss. 9 — Sep. 1, 2008
  • pp: 2309–2319

Discrimination of isotrigon textures using the Rényi entropy of Allan variances

Salvador Gabarda and Gabriel Cristóbal  »View Author Affiliations


JOSA A, Vol. 25, Issue 9, pp. 2309-2319 (2008)
http://dx.doi.org/10.1364/JOSAA.25.002309


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Abstract

We present a computational algorithm for isotrigon texture discrimination. The aim of this method consists in discriminating isotrigon textures against a binary random background. The extension of the method to the problem of multitexture discrimination is considered as well. The method relies on the fact that the information content of time or space–frequency representations of signals, including images, can be readily analyzed by means of generalized entropy measures. In such a scenario, the Rényi entropy appears as an effective tool, given that Rényi measures can be used to provide information about a local neighborhood within an image. Localization is essential for comparing images on a pixel-by-pixel basis. Discrimination is performed through a local Rényi entropy measurement applied on a spatially oriented 1-D pseudo-Wigner distribution (PWD) of the test image. The PWD is normalized so that it may be interpreted as a probability distribution. Prior to the calculation of the texture’s PWD, a preprocessing filtering step replaces the original texture with its localized spatially oriented Allan variances. The anisotropic structure of the textures, as revealed by the Allan variances, turns out to be crucial later to attain a high discrimination by the extraction of Rényi entropy measures. The method has been empirically evaluated with a family of isotrigon textures embedded in a binary random background. The extension to the case of multiple isotrigon mosaics has also been considered. Discrimination results are compared with other existing methods.

© 2008 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(150.1135) Machine vision : Algorithms
(100.4992) Image processing : Pattern, nonlinear correlators

ToC Category:
Machine Vision

History
Original Manuscript: January 22, 2008
Revised Manuscript: April 25, 2008
Manuscript Accepted: May 27, 2008
Published: August 20, 2008

Citation
Salvador Gabarda and Gabriel Cristóbal, "Discrimination of isotrigon textures using the Rényi entropy of Allan variances," J. Opt. Soc. Am. A 25, 2309-2319 (2008)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-25-9-2309

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