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Proceedings Paper

Pulse-width modulation, smooth-pursuit eye movements, and moving-object perception
Author(s): Julie Mapes Lindholm; Angelique A. Scharine
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Paper Abstract

If a display system uses pulse-width modulation (PWM) to create grayscale, presentation of the RGB value of a pixel may occupy a substantial portion of the refresh period and thus attenuate high temporal frequencies in the display image. When the image depicts object or selfmotion, some ofthe attenuated spatiotemporal frequency components are likely to be part of the spectrum of the original image. Prior research suggests that, during tracking of a moving target, modification of the original-image spectrum will result in nonveridical perception of the chromoluminance pattern that defines that target. We developed a procedure for predicting an observer's spatial percept while tracking the target in a pulse-width modulated display of a constant-velocity motion sequence. The results of a target identification task indicate that displayable versions of such patterns were well matched to observers' percepts and provide strong support for the view that observers perceive the spatial pattern that moves in accord with the sampled velocity rather than the spatial pattern of the target. The perceived pattern is equivalent to that which would be repetitively painted on the retina if the velocity of smooth pursuit were exactly matched to the sampled velocity

Paper Details

Date Published: 29 February 2000
PDF: 9 pages
Proc. SPIE 3968, High-Speed Imaging and Sequence Analysis II, (29 February 2000); doi: 10.1117/12.378871
Show Author Affiliations
Julie Mapes Lindholm, Lockheed Martin Technology Services Group (United States)
Angelique A. Scharine, Arizona State Univ. (United States)

Published in SPIE Proceedings Vol. 3968:
High-Speed Imaging and Sequence Analysis II
Alan M. Frank; James S. Walton; James S. Walton, Editor(s)

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