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Mesopic visual efficiency I: detection threshold measurementsLaboratory of Lighting Technology, Darmstadt University of Technology, Germany, office{at}lichttechnik.tu-darmstadt.de
Lighting Laboratory, Helsinki University of Technology, Finland
Lighting Laboratory, Helsinki University of Technology, Finland
Lighting Laboratory, Helsinki University of Technology, Finland
Applied Vision Research Centre, Henry Wellcome Laboratories for Vision Sciences, City University, UK
National Physical Laboratory, UK
TNO Human Factors, The Netherlands
Virtual Environment and Imaging Technologies Laboratory, Pannon University, Hungary
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(
Lighting Research and Technology, Vol. 39, No. 4,
319-334 (2007) This article has been cited by other articles:
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), 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(
