Determination of the time dependence of colored afterimages

H.-D. Reidenbach

doi:10.1117/12.762852

11 February 2008 Determination of the time dependence of colored afterimages

H.-D. Reidenbach

Proceedings Volume 6844, Ophthalmic Technologies XVIII; 68441N (2008) https://doi.org/10.1117/12.762852
Event: SPIE BiOS, 2008, San Jose, California, United States

Abstract

Investigations have been done with high-brightness LEDs in order to determine the flight of colors for these high-intensity light sources. By simply glancing into such a device for time durations of less than 10 seconds a long-lasting afterimage that slowly changes colors was observed. A computer assisted measuring system was developed in order to determine the dependency on various parameters like color, optical power, exposure duration of the stimulating LED. For that a specially designed color wheel diagram has been designed and used which contains the necessary information on hue, saturation, and brightness. The time-dependent process and changes of the afterimage colors were determined for 4 different dominant wavelengths, i.e. 455 nm, 530 nm, 590 nm and 625 nm, in the optical power range between 0.05 mW and 0.5 mW for exposure durations between 0.5 s and 5 s. The results obtained with 5 test persons will be reported and especially the time course of the color fractions is given in an 8-bit color space with the respective RGB values. The progression of the afterimage colors as a function of the applied optical energy will be shown in the CIE chromaticity diagram together with the respective total afterimage duration.

Citation Download Citation

H.-D. Reidenbach "Determination of the time dependence of colored afterimages", Proc. SPIE 6844, Ophthalmic Technologies XVIII, 68441N (11 February 2008); https://doi.org/10.1117/12.762852

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