Lightness perception based on perception of shadow and perceived brightness

KAKEN

About This Project

Japan Grant Number
JP25730166 (JGN)
Funding Program
Grants-in-Aid for Scientific Research
Funding Organization
Japan Society for the Promotion of Science

Kakenhi Information

Project/Area Number
25730166
Research Category
Grant-in-Aid for Young Scientists (B)
Allocation Type
  • Multi-year Fund
Review Section / Research Field
  • Integrated Disciplines > Informatics > Human informatics > Kansei informatics
Research Institution
  • Ritsumeikan University
Project Period (FY)
2013-04-01 〜 2016-03-31
Project Status
Completed
Budget Amount*help
4,160,000 Yen (Direct Cost: 3,200,000 Yen Indirect Cost: 960,000 Yen)

Research Abstract

We see shadows everywhere. Shadows are the visual response to an absence of light, in other words, all shadows are intangible. We usually don’t pay attention to shadows, but we sometime can aware that a space is brightly illuminated by seeing dark shadows. It is not revealed how shadow affects our brightness perception of a space. In this research, we tested whether the perception of shadow affects the perception of brightness of a space. Using multidimensional scaling we analyzed the dissimilarity structure produced by different intensity of illuminances and shadows. Experimental results showed that the apparent brightness of the space was proportional to the intensity of illuminance and to the shades of shadow. It indicates that our visual system uses information of shades of shadow to estimate the apparent brightness of the space.

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