Successive heterochromatic brightness matches for a LED display

Year: 1986

Authors: Ronchi L.

Autors Affiliation: Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: An experiment is described in which red and green pointlike sources are flashed in succession on nearby locations on the retina of the eye. While keeping the intensity of the green light fixed, the red’s intensity is varied until a heterochromatic brightness match is attained. As the retinal image is more and more defocussed by the use of a blurring lens, less and less red light is needed to match the green reference light, both in the central retina and at moderate eccentricities, while the far periphery shows an insensitivity to blur. The result is tentatively explained by extending to peripheral vision some speculations concerning the brightness-luminance discrepancy in central vision. As a practical implication, it is noted that the photometric assessment of small sources, holding for the plane in which the eye is at focus, may exhibit deviations even as large as 0.5 log units when passing to defocussed locations.

Journal/Review: COLOR RESEARCH AND APPLICATION

Volume: 11 (2)      Pages from: 164  to: 168

KeyWords: LED display; vision;
DOI: 10.1002/col.5080110214

Citations: 1
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