29 February 2000 Pulse-width modulation, smooth-pursuit eye movements, and moving-object perception
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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
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Julie Mapes Lindholm, Julie Mapes Lindholm, Angelique A. Scharine, Angelique A. Scharine, } "Pulse-width modulation, smooth-pursuit eye movements, and moving-object perception", Proc. SPIE 3968, High-Speed Imaging and Sequence Analysis II, (29 February 2000); doi: 10.1117/12.378871; https://doi.org/10.1117/12.378871
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