We evaluated an observer’s fatigue and a sense of presence, in observing the no-disparity realistic image (NDR image)
[1-3]. NDR image is consisted of two images (right and left image). Right image is created by shifting all pixels in left
image same amount. Consequently, there are no disparities in all area of NDR image. NDR image which is reconfigured
the contents that contain image with large disparity might have a possibility that it suppress an observer’s fatigue and let
him feel high presence. Subjects observed three condition's videos (stereoscopic, NDR and 2D). Subjects observed two
videos in each condition. Each video was 30 minutes. There were scenes with large disparity (more than 5 degrees) in
videos. Subjects responded SSQ (Simulator Sickness Questionnaire), VAS (Visual Analogue Scale) for fatigue and
questionnaire on realism and were measured CFF (Critical Frequency Fusion), accommodation tremor, stereoscopic
vision test, ocular position measurement and eye sight test. Results showed that NDR image let observer feel high
presence and an observer's fatigue was low. NDR image is effective, even if contents which contain large disparity are
converted into NDR image.
Absolute measurement of spherical surface by use of point diffraction interferometer (PDI) has been studied both theoretically and experimentally. By the estimation of optical error, 10-3 (lambda) rms can be expected as absolute accuracy. Experimental results with high accuracy have been obtained.
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