Task Validation Display Temporal-Resolution Measurements

摘要

We have recently described a perceptual technique for assessing the temporal resolution of display systems used in Air Force flight-simulators. That technique was based on the assessment of the perceived blur of a simple stimulus consisting of a pair of moving vertical lines. In the present study, we have attempted to validate our previous technique by correlating it directly with performance on simplified tasks that may be performed during training in a high-fidelity Air Force flight simulator. Data were obtained by asking observers to; (1) detect whether or not a moving F-16 target-aircraft banked as it moved laterally across the observers' field-of-view, and (2) judge whether changes in aircraft pitch resulted in blurring of the associated moving terrain. The level of moving-image blur was determined by the length of time that the image was presented during each video frame (i.e., the projector hold- time) on a digital (DLP) projector. The results were compared to those obtained using a standard CRT projector, whose effective hold-time was about one-quarter of that of the lowest DLP hold-time tested. For both the roll detection task and the aircraft pitch task, results with the DLP projector did not differ significantly from that obtained with the CRT when the DLP hold-time was reduced to 5.8 msec. These results are in qualitative agreement with those obtained using the simpler moving-line test, and suggest that the latter is a valid measure of display temporal resolution in the context of flight-simulator applications.