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Mesopic visual efficiency III: Discrimination threshold measurements.

Goodman, T M; Várady, G*; Freiding, A*; Eloholma, M*; Halonen, L*; Walkey, H*; Alferdinck, J* (2007) Mesopic visual efficiency III: Discrimination threshold measurements. Lighting Res. Technol., 39 (4). pp. 355-364.

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The authors represent a research consortium which has adopted a task performance based approach for night-time driving to obtain mesopic spectral sensitivity functions. This paper describes investigations based on discrimination threshold techniques and compares the results with those obtained from detection threshold measurements. It forms a continuation of `Mesopic models - from brightness matching to visual performance in night-time driving: a review¿.
The achromatic increment contrast threshold for discrimination of a quasi-static target represents the ability to correctly identify a target which has low contrast with the background and is therefore a highly relevant visual task in the context of night-time driving. The psychophysical experiments reported here were carried out in the laboratory and in dynamic night-time driving tests.
The spectral sensitivity functions resulting from the discrimination threshold contrast investigations show a significant contribution from the colour-opponent (or chromatic) channels of the visual system. Similar features have been observed in results from investigations using detection threshold techniques.

Item Type: Article
Keywords: mesopic vision, discrimination threshold, contrast threshold, mesopic photometry, spectral sensitivity, spectral luminous efficiency, night-time driving, mesopic visual performance
Subjects: Optical Radiation and Photonics
Optical Radiation and Photonics > Materials and Appearance
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4062

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