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Orientational Selectivity is Retained in Zero-Crossings Obtained Via Stochastic Resonance

  • Ajanta Kundu
  • Sandip Sarkar
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 202)

Abstract

Computational theory of visual information processing suggest that the initial stages information processing consists of in part representation of zero crossing in the visual scene filtered through a suitable second order differential operator (centre-surround receptive field). These zero crossings often correspond to sharp intensity changes in the visual scene and are rich in information. We report here our investigation, through simulation study, on the role of zero crossings in orientational selectivity measurement. We show that the perceptive contrast sensitivity of zero-crossing of sub-threshold noise contaminated grating image exhibit stochastic resonance. We also show that the contrast sensitivity of test grating, in the presence of a masking grating, decreases with the increase of masking contrast. The qualitative nature of the contrast sensitivity variations are in agreement with the results of various phychophysical experiments.

Keywords

Zero-crossing Contrast sensitivity Stochastic resonance Receptive field LoG 

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Copyright information

© Springer India 2013

Authors and Affiliations

  1. 1.Applied Nuclear Physics DivisionSaha Institute of Nuclear PhysicsKolkataIndia

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