Accession Number:

ADA316971

Title:

Image Update Rate Can Affect the Perceived Speed of Simulated Self-Motion.

Descriptive Note:

Final rept. Jun 92-May 95,

Corporate Author:

HUGHES TRAINING INC MESA AZ TRAINING OPERATIONS DIV

Report Date:

1996-06-01

Pagination or Media Count:

49.0

Abstract:

The update rate of an image generator affects the spatiotemporal representation of a time-varying scene and thus, potentially, an observers percept during observation of the display image. In the first part of this report, we discuss image generation technology and sampling theory, and we present an analysis of the temporal frequencies in a space-time image representing constant-velocity, constant-altitude flight over a flat, textured terrain. In the second part, we report the results of two experiments in which a two-alternative, forced-choice method of constant stimuli was used to investigate the effects of image update rate 30 Hz vs 60 Hz on the perceived speed of self motion. We found that perceived speed was higher with the lower update rate when the original image, internal to the computer, contained very high temporal frequencies, and the display image, therefore, contained a large number of spatiotemporal frequencies, within the bandpass of the human visual system, which had the wrong drift direction.

Subject Categories:

  • Cybernetics
  • Human Factors Engineering and Man Machine Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE