The Verriest Lecture: Visual properties of metameric blacks beyond cone vision

Abstract

The generic framework of metamerism implies that the number of sensors is smaller than the dimension of the stimulus. The metameric black paradigm was introduced by Wyszecki [Farbe2, 39 (1953)] and developed by Cohen and Kappauf [Am. J. Psychol.95, 537 (1982)]. Within a multireceptor and multiprimary scheme, we investigate how far the choice of illumination can isolate a photoreceptor response. The spectral profiles of the fundamental metamers that correspond to a collection of (x,y) values over the chromaticity diagram are shown. When the luminance is set at a fixed value, the relative excitation of the melanopsin cells and of the rods elicited by the fundamental metamers varies over the chromaticity diagram. The range of excitation of the melanopsin cells and of the rods that could be achieved at a given chromaticity, by manipulating the metameric black content, is examined. When only the melanopsin excitation is manipulated, the range of melanopsin excitation that can be achieved is rather limited. On the chromaticity diagram, the largest range of variation of the rods and the melanopsin cells excitation is obtained for (x,y) chromaticity coordinates near (1/3,1/3). Extension of Cohen's procedure to rod and cone metamers is proposed. The higher the number of spectral bands, the wider the choice of metameric lights.

A five-primary photostimulator suitable for studying intrinsically photosensitive retinal ganglion cell functions in humans

“…Viénot and associates (Viénot & Brettel, 2014;Viénot, Brettel, Dang, & Le Rohellec, 2012) developed a seven-primary system to study the rod and melanopsin inputs to pupil responses using a metameric black framework (Cohen & Kappauf, 1982;Wyszecki, 1958). They maintained cone excitations constant while searching for ''black metamers'' that activated both rods and melanopsin.…”

Color Converting of Endoscopic Images Using Decomposition Theory and Principal Component Analysis

“…Premultiplying any 3×1 dimensional vectors of S by the p×3 matrix, L (L' L) -1 produce a p×1 dimensional vector of SFCS [18].…”

Study on metamerism degree evaluation based on wavelength sensitive cone weighting algorithm

“…The larger the absolute value of PLCC, the stronger the correlation; the closer the correlation coefficient is to 0, the weaker the correlation. 4. The root mean square error (RMSE) was calculated as the size of difference between a predictive nonlinear fit of the evaluation results of each MI and corresponding color difference evaluation results ΔE * ab .…”

“…Obviously, facing metamerism, it is difficult for us to truly solve and eliminate this phenomenon . Therefore, making use of metamerism can bring great benefits to the relevant fields of light source quality control …”

“…2,3 Obviously, facing metamerism, it is difficult for us to truly solve and eliminate this phenomenon. 4 Therefore, making use of metamerism can bring great benefits to the relevant fields of light source quality control. 5 In this day and age with the development of the illuminant market, there are various kinds of illuminants available.…”