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Mesopic visual efficiency I: detection threshold measurements

Laboratory of Lighting Technology, Darmstadt University of Technology, Germany, office{at}lichttechnik.tu-darmstadt.de

M. Eloholma, DSc

Lighting Laboratory, Helsinki University of Technology, Finland

J. Ketomäki, DSc

Lighting Laboratory, Helsinki University of Technology, Finland

L. Halonen, DSc

Lighting Laboratory, Helsinki University of Technology, Finland

H. Walkey, PhD

Applied Vision Research Centre, Henry Wellcome Laboratories for Vision Sciences, City University, UK

T. Goodman, BSc

National Physical Laboratory, UK

J. Alferdinck, BSc

TNO Human Factors, The Netherlands

G. Várady, MSc

Virtual Environment and Imaging Technologies Laboratory, Pannon University, Hungary

P. Bodrogi, PhD

Virtual Environment and Imaging Technologies Laboratory, Pannon University, Hungary

Achromatic thresholds are measured at three sites to investigate the effects of light spectrum on achromatic detection thresholds in the mesopic region. The results of measurements using quasi-monochromatic targets reveal spectral sensitivity functions with two or three peaks, a so-called `chromatic effect' which is assumed to be due to the influence of the colour-opponent channels. This chromatic contribution seem to be less significant at lower luminances but it is accentuated for peripheral observation. Results obtained with broadband stimuli show that the contrast threshold, defined in terms of V(), is markedly higher for red targets than for other colours, particularly at lower light levels. For these broadband targets, contrast threshold values calculated using the new spectral sensitivity curves instead of V() are in better agreement with the experimental results, particularly for the peripheral detection task.

Lighting Research and Technology, Vol. 39, No. 4, 319-334 (2007)
DOI: 10.1177/1477153507080917


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