Computational Approaches to Visual Photometry

Abstract

In this paper, we delve into contemporary techniques employed in the computation of visual perceptions of luminous intensity. We explore the standard methodologies adopted by the International Commission on Illumination (ISO), which encompass both achromatic and chromatic radiances. The ISO methods involve the determination of light efficiency functions tailored to various levels of photopic, scotopic, and mesopic adaptation for the observer. The light efficiency functions of standardized ISO observers with a 2-degree field and a 10-degree field are compared to the light efficiency functions derived from the basic sensitivity characteristics of the photoreceptors in the retina. The calculation of the eye’s utilization of blackbody radiation reveals that the difference in coefficients between the 2-degree and 10-degree observers can reach up to 13 %. This example demonstrates that, for a 10-degree observer, there is a close correspondence between the standard MCO light efficiency function and the one calculated based on the fundamental sensitivity parameters, with an error falling within the acceptable range for engineering calculations (3--5 %). These findings provide guidance on the suitability of various techniques for addressing practical challenges in visual and objective photometry, particularly considering the light efficiency characteristics of 2- and 10-degree observers for both achromatic and chromatic radiation

Please cite this article in English as:

Pyasetsky V.B., Khorokhorov A.M., Shirankov A.F. Computational approaches to visual photometry. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2024, no. 6 (117), pp. 15--35 (in Russ.). EDN: FGEIWX

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