Models for spectral luminous efficiency in peripheral vision at mesopic and low photopic luminance levels

 |  Login

Show simple item record

dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Orreveteläinen, Pasi
dc.date.accessioned 2012-02-17T07:15:33Z
dc.date.available 2012-02-17T07:15:33Z
dc.date.issued 2005-10-28
dc.identifier.isbn 951-22-7857-X
dc.identifier.issn 1795-9039
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2615
dc.description.abstract The aim of this work was to find out how the spectral sensitivity of the human eye varies in peripheral vision at mesopic and low photopic luminance levels. Two different measurement methods were employed for this purpose. Reaction time and contrast threshold measurements were conducted at various mesopic and low photopic luminance levels in foveal and peripheral vision. Luminance levels between 0.1 cd/m2 and 20 cd/m2 and visual target eccentricities of 0°, 10°, 30° and 60° were investigated in the measurements. Both measurement methods revealed the same observations: at low photopic luminance levels, the currently used V(λ) function is not the best descriptive spectral luminous efficiency function for peripheral vision. The short wavelengths were underestimated by the V(λ) function. A new spectral luminous efficiency function Vper(λ) was developed for peripheral vision at photopic light levels. This function is a linear combination of V(λ) and V10(λ) functions and takes into account the higher spectral sensitivity to short wavelengths as compared to the V(λ) function. Both measurement methods show that this function describes the spectral sensitivity of the eye better than V(λ), VM(λ) or V10(λ) functions at low photopic luminance levels (≤ 20 cd/m2). At mesopic luminance levels (≥ 0.1 cd/m2), it was investigated how a linear combination of photopic and scotopic spectral luminous efficiency functions describes the spectral sensitivity of the eye in peripheral vision. A model for the mesopic spectral luminous efficiency function Vmes(λ) was developed for peripheral vision. The results showed that this function describes the peripheral spectral sensitivity with best accuracy at mesopic luminance levels. The new function was compared with the proposed unified system of photometry by Rea, Bullough, Freyssinier-Nova and Bierman (2004). The function developed in this work described the measurement results with much higher accuracy. A sigmoid function was developed to describe the mesopic spectral luminous efficiency function as a combination of photopic and scotopic spectral luminous efficiency functions. This function can be used to calculate the weighting coefficient from 0.1 cd/m2 upwards. en
dc.format.extent 80
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Report / Helsinki University of Technology, Lighting Laboratory en
dc.relation.ispartofseries Teknillinen korkeakoulu, valaistuslaboratorio fi
dc.relation.ispartofseries 37 en
dc.subject.other Electrical engineering en
dc.title Models for spectral luminous efficiency in peripheral vision at mesopic and low photopic luminance levels en
dc.type G4 Monografiaväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Electrical and Communications Engineering en
dc.contributor.department Sähkö- ja tietoliikennetekniikan osasto fi
dc.subject.keyword peripheral vision en
dc.subject.keyword mesopic vision en
dc.subject.keyword reaction time en
dc.subject.keyword contrast threshold en
dc.subject.keyword spectral luminous efficiency function en
dc.identifier.urn urn:nbn:fi:tkk-005750
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (monografia) fi
dc.type.ontasot Doctoral dissertation (monograph) en
dc.contributor.lab Lighting Laboratory en
dc.contributor.lab Valaistuslaboratorio fi


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search archive


Advanced Search

article-iconSubmit a publication

Browse

My Account