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Context affects lightness at the level of surfaces.

Marianne Maertens1, Felix A Wichmann2, Robert Shapley2

  • 1Modelling of Cognitive Processes Group, Department of Software Engineering and Theoretical Computer Science, Technische Universität Berlin, Berlin, Germany.

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|January 16, 2015
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Summary

The visual system

Keywords:
assimilationcontextmid-level visionsurface lightness

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Area of Science:

  • Visual perception
  • Cognitive neuroscience
  • Image processing

Background:

  • Perceiving surface lightness is vital for environmental interaction.
  • The influence of visual context on lightness perception is known, but the underlying mechanisms (low-, mid-, or high-level) remain unclear.

Purpose of the Study:

  • To investigate how perceptual attributes of target image regions influence their perceived lightness within varying contexts.
  • To determine if mid-level visual mechanisms play a role in modulating lightness perception based on image context.

Main Methods:

  • Manipulated edge sharpness of target regions while maintaining constant total flux.
  • Presented targets with sharp and blurred edges in different contexts to observers.
  • Measured perceived lightness changes in response to contextual variations.

Main Results:

  • Targets with sharp edges, interpreted as surfaces, showed significant contextual effects on perceived lightness (brightening or darkening).
  • Targets with blurred edges, perceived as spotlights, exhibited minimal contextual influence on lightness.
  • Image manipulations altering perceptual attributes significantly affect contextual modulation of lightness.

Conclusions:

  • Lightness perception is not solely context-dependent but is modulated by the perceived object properties.
  • Mid-level scene interpretation, influenced by image features like edge sharpness, significantly impacts how visual context affects lightness perception.