Kuntal Ghosh

Indian Statistical Institute, Baranagar, Bengal, India

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Publications (2)1.31 Total impact

  • Ashish Bakshi, Kuntal Ghosh
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    ABSTRACT: Mach bands are the pronounced light and dark bands visible where a luminance plateau meets a ramp as in a penumbra. A great deal of effort has been devoted to study these in order to understand the underlying neural circuitry. A number of theoretical models, linear and non-linear, have consequently been proposed starting from the seminal studies of Ernst Mach himself. In this work we demonstrate why no linear model of visual perception can explain the Mach band illusion although many such attempts have been made starting from that of Mach to some recent ones. From the same approach, we also systematically demonstrate why the Mach bands are weak or inexistent at step changes of intensity. A new aspect, viz. the scaling properties of the widths of Mach band has been studied to provide a unified approach to solve both these problems in vision.
    Perception and Machine Intelligence - First Indo-Japan Conference, PerMIn 2012, Kolkata, India, January 12-13, 2012. Proceedings; 01/2012
  • Ashish Bakshi, Kuntal Ghosh
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    ABSTRACT: In this paper we present some demonstrations concerning the width of Mach bands and henceforth hypothesize certain relations. We show that it is the variation in width of Mach bands in relation to luminance gradients which is responsible for Mach bands being strong for luminance ramps and weak or vanishing for luminance steps. We present the results of the experiments carried out by us using some of these demonstrations to provide support for our claims.
    Perception 01/2012; 41(11):1403-8. · 1.31 Impact Factor

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1.31 Total Impact Points

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Institutions

  • 2012
    • Indian Statistical Institute
      • Machine Intelligence Unit (MIU)
      Baranagar, Bengal, India