Abstract— The ideal frame rate for the highest motion‐image quality with respect to blur and jerkiness is presented. In order to determine the requirements for avoiding these impairments, motion images from a high‐speed camera and computer graphics were combined with a high‐speed display to perform a psychophysical evaluation. The camera, operating at 1000 fps, and image processing were used to simulate various frame rates and shutter speeds, and a 480‐Hz CRT display was used to present motion images simulating various frame rates and time characteristics of the display. Subjects were asked to evaluate the difference in quality between motion images at various frame rates. A frame rate of 480 fps was chosen to be an appropriate reference frame rate that, as a first estimation, enables coverage up to the human‐dynamic‐resolution (HDR) limit based on another experiment using real moving charts. The results show that a frame rate of 120 fps provides good improvement compared to that of 60 fps, and that the maximum improvement beyond which evaluation is saturated is found at about 240 fps for representative standard‐resolution natural images.
The required frame rate for the best motion image quality against blur and jerkiness is presented. To avoid those impairments, psychophysical evaluation had been applied. The result shows that 120fps performs good improvement comparing to 60fps while the best improvement where evaluation is saturated is found at around 240fps.
The relationship between high frame rate and depth perception was investigated. Psychophysical experiments using moving random dot stereograms to study depth discrimination under several conditions showed that three‐dimensional motion images produced and displayed with a frame rate of 240 fps enable finer discrimination of depth for the viewer compared with frame rates of 120 or 60 fps. In addition, overall evaluations of natural three‐dimensional motion images by viewers confirmed that more natural motion and depth impressions were presented at 240 fps than at lower frame rates. Further, the results are discussed with reference to a recent theoretical model of the dynamic spatial frequency response of the camera/display system.
The human electroencephalographic (EEG) power spectra when viewing visual stimuli of a real motion image and of motion images with 60 frames/s (fps) and 240 fps were investigated. The EEG spectra in response to the 240 fps motion image stimuli were more similar to those of the real motion image stimuli than those of the 60 fps stimuli. This high frame rate (240 fps) motion image is considered to have a possibility of providing perceptions of motion image quality that are close to the impression upon looking at real world scenes.
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