Design and testing of a perimeter of increment threshold by projection
M.C. García-Domene, M.J. Luque, D. De Fez
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Base Information
Volume
V50 - N1 / 2017 Ordinario
Reference
13-23
DOI
http://doi.org/10.7149/OPA.50.1.49504
Language
Spanish
Keywords
Perimeter, projector, chromatic visual field, visual mechanisms
Abstract
In the present study, we have designed and tested a perimeter for the detection of damage in the chromatic mechanisms using a video projector. To this purpose, we have characterized pixel to pixel a video projector, to account for the inhomogeneities in the projection. We have measured the tristimulus values of the projector primaries as a function of digital level, at 49 locations of the projection screen and, from them, we have arrived to a characterization model which reduces the color differences between predicted and reproduced color, in comparison with the traditional method, which generalizes the characterization of the screen center to all the screen. With the perimeter, we measured the detection thresholds of stimuli favouring the response of the red-green and blue-yellow chromatic mechanisms of the human visual system. Stimulus size could either be constant or change with eccentricity with the size of the receptive fields of the neurons in the visual cortex. The psychophysical method of measurement used is the MOBS (Modified Binary Search). We have studied the factors that can distort the measurements, as well as the repeatability, the specificity and the sensitivity of the device, with good results. A database has been created for the configuration of constant size stimulus. The trends shown by the data are consistent with the literature. When comparing both size configurations, the peripheral sensitivity is increased and repeatability is better with the stimulus size adapted to the eccentricity.
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M.C. García-Domene "Diseño de un campímetro de umbral incremental de proyección" Universidad de Alicante, España (2013)Tesis
Registro de la propiedad A-238-14 Diseño de un campímetro de umbral incremental de proyección (Programa de ordenador)
Registro de la propiedad A-239-14 Diseño de un campímetro de umbral incremental de proyección (Base de datos)