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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 5, Iss. 8 — Jun. 8, 2010

Application of Riesz transforms to the isotropic AM–PM decomposition of geometrical-optical illusion images

Vicente Sierra-Vázquez and Ignacio Serrano-Pedraza  »View Author Affiliations


JOSA A, Vol. 27, Issue 4, pp. 781-796 (2010)
http://dx.doi.org/10.1364/JOSAA.27.000781


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Abstract

The existence of a special second-order mechanism in the human visual system, able to demodulate the envelope of visual stimuli, suggests that spatial information contained in the image envelope may be perceptually relevant. The Riesz transform, a natural isotropic extension of the Hilbert transform to multidimensional signals, was used here to demodulate band-pass filtered images of well-known visual illusions of length, size, direction, and shape. We show that the local amplitude of the monogenic signal or envelope of each illusion image conveys second-order information related to image holistic spatial structure, whereas the local phase component conveys information about the spatial features. Further low-pass filtering of the illusion image envelopes creates physical distortions that correspond to the subjective distortions perceived in the illusory images. Therefore the envelope seems to be the image component that physically carries the spatial information about these illusions. This result contradicts the popular belief that the relevant spatial information to perceive geometrical-optical illusions is conveyed only by the lower spatial frequencies present in their Fourier spectrum.

© 2010 Optical Society of America

OCIS Codes
(100.2960) Image processing : Image analysis
(330.5020) Vision, color, and visual optics : Perception psychology
(330.6110) Vision, color, and visual optics : Spatial filtering

ToC Category:
Vision, Color, and Visual Optics

History
Original Manuscript: June 11, 2009
Revised Manuscript: December 11, 2009
Manuscript Accepted: January 15, 2010
Published: March 22, 2010

Virtual Issues
Vol. 5, Iss. 8 Virtual Journal for Biomedical Optics

Citation
Vicente Sierra-Vázquez and Ignacio Serrano-Pedraza, "Application of Riesz transforms to the isotropic AM-PM decomposition of geometrical-optical illusion images," J. Opt. Soc. Am. A 27, 781-796 (2010)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josaa-27-4-781

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