Human interpretation of light diffuseness

Ling Xia, Tingting Zhang, Xiaofeng Liu, Sylvia Pont

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

The light diffuseness (Xia, Pont et al. 2016, Xia, Pont et al. 2016) can strongly influence the appearance of scenes and objects inside it. There are numerous studies investigating how to measure the light diffuseness or modelling index. However, there are few studies about how light diffuseness is interpreted by human observers. We use an appearancematching experiment to investigate observers' visual interpretation of light diffuseness from object appearance and its potential interactions with viewing angles, light probe type, etcetera. The results indicate that, generally, the observers are able to distinguish different diffuseness levels for both the smooth and rough white spherical probes. The 'diffuseness-direction ambiguity' (Pont and Koenderink 2007) is obvious especially for the smooth probe and it can be largely corrected for by the 'effective vector to scalar ratio' (Cuttle 1971). Moreover, the results showed that the use of a probe with mesorelief can at least partly resolve the 'diffuseness-direction ambiguity'.

Original languageEnglish
Title of host publication2017 14th China International Forum on Solid State Lighting
Subtitle of host publicationInternational Forum on Wide Bandgap Semiconductors China, SSLChina: IFWS 2017
PublisherIEEE
Pages113-116
Number of pages4
ISBN (Electronic)978-1-5386-4851-3
ISBN (Print)978-1-5386-4852-0
DOIs
Publication statusPublished - 2018
Event14th China International Forum on Solid State Lighting: International Forum on Wide Bandgap Semiconductors China, SSLChina: IFWS 2017 - Beijing, China
Duration: 1 Nov 20173 Nov 2017

Conference

Conference14th China International Forum on Solid State Lighting: International Forum on Wide Bandgap Semiconductors China, SSLChina: IFWS 2017
CountryChina
CityBeijing
Period1/11/173/11/17

Keywords

  • Probes
  • Lighting
  • Observers
  • Sports equipment
  • Mathematical model
  • Visualization

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