Visual Performance Under Mesopic Conditions: Towards Determination of Adaptation Luminance

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Puolakka, Marjukka, Dr., Aalto University, Department of Electrical Engineering and Automation, Finland
dc.contributor.author Cengiz, Can
dc.date.accessioned 2015-11-02T10:02:00Z
dc.date.available 2015-11-02T10:02:00Z
dc.date.issued 2015
dc.identifier.isbn 978-952-60-6440-6 (electronic)
dc.identifier.isbn 978-952-60-6439-0 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/18243
dc.description.abstract The Commission Internationale de l'Eclairage (CIE) published a system for visual performance-based mesopic photometry in 2010. It is valid between the luminances 0.005 cd/m2 and 5 cd/m2. In night-time driving conditions, the luminances in the visual scene are in the mesopic range; thus, mesopic photometry should be adopted when assessing lighting in outdoor areas and other night-time traffic environments. In order to implement the CIE mesopic photometry, the background photopic luminance, i.e. adaptation luminance, is required as an input value. The aim of the study is to develop methods for estimating the field of view of which the luminance is to be used as the adaptation luminance in implementing the CIE 191 system for mesopic photometry. This is realised by applying methods such as combining eye-tracking data with corresponding luminance data and analysing peripheral target detection under uniform and non-uniform luminous backgrounds. In the study of combining eye-tracking measurements with luminance data, the visual scene areas with the highest density of gaze distributions were determined. The measured luminances for these visual scenes were used to form an estimate of the adaptation luminance under different driving conditions in the lit and the unlit sections of a rural road. The mean luminances of the estimated fields were higher in the unlit section than in the lit section of the route for all drivers. This was due to high-beam head-lights that illuminated the road surface, whereas the gaze points were concentrated in the unlit section. Experiments in laboratory conditions were conducted in order to obtain the effect of background and target location and its luminance on visual performance. Reaction time and contrast threshold measurements were made to analyse peripheral target detection in uniform and non-uniform backgrounds. Under non-uniform background luminances, peripheral target detection depends on the local luminance of the target and the luminance uniformity of the surrounding area of the target. The results verify that each part of the retina adjusts its sensitivity independently, which refers to local adaptation. However, the complexity of the visual field also has an effect on visual sensitivity in peripheral vision. Further studies, where road type, driving speed and discomforting glare are taken into account, are needed to define the visual adaptation field and corresponding adaptation luminance in various driving conditions. en
dc.format.extent 56 + app. 92
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 163/2015
dc.relation.haspart [Publication 1]: I.Puolakka, Marjukka; Cengiz, Can; Luo, Wei; Halonen Liisa. ‘Implementation of CIE 191 Mesopic Photometry – Ongoing and Future Actions’. Proceedings of CIE Lighting Quality & Energy Efficiency, 2012, Hangzhou, September 24–26, p. 64–70.
dc.relation.haspart [Publication 2]: II. Cengiz, Can; Kotkanen, Henri; Puolakka, Marjukka; Lappi, Otto; Lehtonen, Esko; Halonen, Liisa; Summala, Heikki. ‘Combined eye-tracking and luminance measurements when driving on a rural road: towards determining mesopic adaptation luminance when driving’. SAGE Journals. Lighting Research and Technology, 2014, volume 46, issue 4, pp. 676–694. DOI: 10.1177/1477153513503361.
dc.relation.haspart [Publication 3]: III. Cengiz, Can; Puolakka, Marjukka; Halonen, Liisa. ‘Reaction time measurements under mesopic light levels’. Proceedings of CIE Lighting Quality & Energy Efficiency, Kuala Lumpur, April 24–26, 2014, pp. 532–537.
dc.relation.haspart [Publication 4]: IV. Cengiz, Can; Puolakka, Marjukka; Halonen, Liisa. ‘Reaction time measurements under mesopic light levels: Towards estimation of the visual adaptation field’. Accepted for publication in the journal Lighting Research and Technology in the year 2014. Published online before print October 20, 2014. DOI: 10.1177/1477153514554494
dc.relation.haspart [Publication 5]: V. Cengiz, Can; Maksimainen, Mikko; Puolakka, Marjukka: Halonen, Liisa. ‘Contrast threshold measurements of peripheral targets in nighttime driving images’. Accepted for publication in the journal Lighting Research and Technology in the year 2015. Published online before print March 26, 2015. DOI: 10.1177/1477153515578308
dc.relation.haspart [Publication 6]: VI. Cengiz, Can; Maksimainen, Mikko; Puolakka, Marjukka: Halonen, Liisa. ‘Effects of high luminance objects on peripheral target detection in night-time driving images’. Submitted to the journal Light and Engineering on 18 December 2014.
dc.subject.other Electrical engineering en
dc.subject.other Transport engineering en
dc.title Visual Performance Under Mesopic Conditions: Towards Determination of Adaptation Luminance en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.contributor.school School of Electrical Engineering en
dc.contributor.department Sähkötekniikan ja automaation laitos fi
dc.contributor.department Department of Electrical Engineering and Automation en
dc.subject.keyword mesopic vision en
dc.subject.keyword visual adaptation en
dc.subject.keyword eye-tracking en
dc.subject.keyword reaction time en
dc.subject.keyword contrast threshold en
dc.identifier.urn URN:ISBN:978-952-60-6440-6
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Halonen, Liisa, Prof., Aalto University, Department of Electrical Engineering and Automation, Finland
dc.opn Topalis, Frangiskos, Prof., National Technical University of Athens, Greece
dc.contributor.lab Lighting Unit en
dc.rev Völker, Stephan, Prof.,Technische Universität Berlin, Germany
dc.rev Ayama, Miyoshi, Prof., Utsunomiya University, Japan
dc.date.defence 2015-11-13


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