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Ophthalmic Physiol Opt. 2006 May;26(3):240-5.

Toward a CIE supplementary system of photometry: brightness at any level including mesopic vision.

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National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8566, Japan.


Photometry for brightness at any level including mesopic vision is described on the basis of the work conducted towards the development of a Commission Internationale de l'Eclairage (CIE) supplementary system of photometry in CIE technical committees. Several critical items in developing such a system are discussed: (1) how to scale brightness using the concept of equivalent luminance; (2) the basic vision model of brightness perception; (3) a description of the chromatic contribution to brightness at the photopic as well as at the mesopic level; (4) formulation of an adaptation coefficient for rod-cone interaction. A possible photometric model for brightness is described based on these considerations, together with a quantitative evaluation of the model using experimental data.

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