Mr. Satoshi Shioiri Profile

Satoshi Shioiri

at Chiba Univ.

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Proceedings Article | 6 June 2002 Paper

Relationship between color discrimination threshold and suprathreshold color-difference perception

Haisong Hu, Hirohisa Yaguchi, Satoshi Shioiri

Proceedings Volume 4421, (2002) https://doi.org/10.1117/12.464663

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Based on the psychophysical method of constant stimuli, an experiment was carried out, using CRT-generated stimuli and in CIELAB color space, to test the visual color differences in relation to colorimetric scales. The CIE Gray and Blue color centers, the most basic color and, perceptually, the most different color, respectively, were chosen, and the maximum average size of test color difference was 12 CIELAB ΔE units. The resultant visual data, procesed via probit analysis, were used to analyze the relationship between color discrimination threshold and suprathreshold color-difference preception. The equal color-difference contours, corresponding to all the visual scales, 4.0, 8.0, and 12.0 CIELAB ΔE units, were well fitted into ellipses while maintaining the orientation of the threshold one, but the shapes were not completely the same, especially at Blue center. The comparisons between visual color differences and their colorimetric counterparts, in teh CIELAB ΔE units or threshold units, show linear relations at both color centers, but the slopes were, in general, not equal to 45° and differed for all directions. Thus the suprathreshold color differences can be derived by enlarging the thresholds linearly but not uniformly, i.e. with different ratios for individual directions.

Proceedings Article | 28 February 2001 Paper

Binocular depth perception for moving images

Satoshi Shioiri, Akihiro Morinaga, Ayako Nakajima, Daisuke Kakehi, Hirohisa Yaguchi

Proceedings Volume 10298, 102980A (2001) https://doi.org/10.1117/12.419795

KEYWORDS: 3D displays, Signal processing, 3D image processing, Motion analysis, Visual system

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It is important to know how motion affects on the perception of depth when we present moving images on a three dimensional display. Effect of motion on binocular depth perception has at least three aspects. First, difference in image motion provides the difference of temporal frequency contents of stimulation that perhaps influences the depth perception. Second, the mechanism of motion analysis may interact with that for the binocular depth perception. Third, temporal changes of monocular and binocular depth cues provide the information of motion in depth. Psychophysical studies related to these aspects have revealed the importance of consideration of motion signals for depth processing in the visual system. Reviewing these studies, we discuss possible interactions between motion and depth perception, in addition to the general effect of temporal characteristics of moving stimulus. We also discuss the possible contribution of variety of depth cues to motion in depth perception.

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