Temporal and Spatial Factors Affecting the Perception of Computer-Generated Imagery
Abstract
When computer-generated imagery is presented on a raster display device, the spatiotemporal representation of a given dynamic scene varies with the update of the image generator and the refresh pattern of the display device. The effects of these variables on form perception were examined in 3 experiments. In Experiment 1, observers were instructed to maintain a steady fixation during 267-ms motion sequences. Target shape, target velocity image update rate and raster pattern were varied orthogonally. Identification responses indicated that the temporal interval between successive fields of an interlaced display tended to be perceived as a spatial interval. The probability and extent of this temporal-to-spatial conversion (TSC) declined as target velocity increased. In Experiment 2, observers were instructed to track the target in 30 Hz, interlaced displays of 3 durations (133, 267, and 533 ms). Under these conditions, complete TSC was the predominant percept for all velocities (4.7 to 18.8 deg/s) at the longest sequence duration. In Experiment 3, observers were instructed to track the target in noninterlaced displays. Sequence duration (267, 533, 800, and 1,067 ms), image update rate (15, 30, and 60 Hz), target velocity (4.7, 9.4, and 14.1 deg/s) and direction of target- surround contrast (dark on light, as in Experiments 1 and 2, and light on dark) were varied.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1992
- Accession Number
- ADA249242
Entities
People
- Julie M. Lindholm
Organizations
- University of Dayton