ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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41.08 Three-Dimensional Image Technology(3DIT)/Human Information(HI)
Displaying 1-11 of 11 articles from this issue
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  • Three-Dimensional Image Technology(3DIT)/Human Information(HI)
    Pages Cover1-
    Published: 2021
    Released on J-STAGE: May 26, 2021
    DOIhttps://doi.org/10.11485/itetr.41.08.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Contents
    Pages Cover2-
    Published: 2021
    Released on J-STAGE: May 26, 2021
    DOIhttps://doi.org/10.11485/itetr.41.08.0_Cover2
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Study of stereo camera unit for rigid endoscope enabling low-cost three-dimensional image acquisition
    Yasunori MORISHITA, Tomoya FUKUI, Yasuhiro TAKAKI
    Session ID: 3DIT2017-1,HI2017-45
    Published: 2021
    Released on J-STAGE: May 26, 2021
    DOIhttps://doi.org/10.11485/itetr.41.08.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A stereo camera unit which enables the three-dimensional (3D) image acquisition using conventional two-dimensional (2D) rigid endoscopes is proposed. It consists of an afocal optical system, a beam splitter, and two cameras. The exit pupil of the endoscope, which exists in the proximity of the eyepiece, is optically transferred to a different position. The beam splitter divides the transferred exit pupil into two identical exit pupils, where the entrance pupils of the two cameras are located. The proposed technique provides a low-cost solution for the construction of 3D endoscopes, because conventional 2D endoscopes can be used and the stereo camera unit can be constructed using off the shelf devices. The preliminary experiments were conducted to verify the proposed technique. The evaluation of the resolution, the subjective evaluation, and task efficiency of 3D images are shown.
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  • Evaluation of viewing zone and parallax of reconstructed image projected to fog display by integral photography
    Keisuke UCHIGATA, Takashi KAKUE, Yutaka ENDO, Tomoyoshi SHIMOBABA, Yas ...
    Session ID: 3DIT2017-2,HI2017-46
    Published: 2021
    Released on J-STAGE: May 26, 2021
    DOIhttps://doi.org/10.11485/itetr.41.08.0_5
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Volumetric display is a display that forms an object in three-dimensional (3D) space. Fog display is one of the volumetric display. We proposed system of aerial projection of three dimensional image to fog display by integral photography by only one projector. But viewing zone and parallax of reconstructed three-dimensional image wasn’t evaluated in previous research. Then, we evaluated viewing zone and parallax of reconstructed three-dimensional image in this research.
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  • Improvement of image quality of computer-generated holographic stereogram by using depth images
    Kengo TAIRA, Yasuhiro TAKAKI
    Session ID: 3DIT2017-3,HI2017-47
    Published: 2021
    Released on J-STAGE: May 26, 2021
    DOIhttps://doi.org/10.11485/itetr.41.08.0_9
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In holographic stereograms, speckles are generated in the reconstructed images, because random phase distributions are added to the parallax images to remove areas where images cannot be seen in the viewing area. Moreover, the reconstructed images are out of focus, because the reconstructed images that observed in the viewpoints are not 3D images but parallax images of 3D objects. In this study, we propose techniques that resolve these problems. For the speckle problem, virtual viewpoints are inserted between the original viewpoints and the phase of the parallax images displayed to the all viewpoints are modulated properly. As a result, speckles are regularized and miniaturized. For the blur problem, we calculate the diffraction calculation using the depth images adding the parallax images. As a result, the blur in the reconstructed images is suppressed.
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  • Design of two-channel viewing-zone scanning super multi-view display
    Ken ISHII, Yasuhiro TAKAKI
    Session ID: 3DIT2017-4,HI2017-48
    Published: 2021
    Released on J-STAGE: May 26, 2021
    DOIhttps://doi.org/10.11485/itetr.41.08.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We proposed the configuration of two-channel viewing-zone scanning super multi-view (SMV) display to explore the SMV display conditions that there is not the vergence-accommodation conflict at last research meeting. This time, we explain about design of the system based on the configuration. The system can alter the interval of viewpoints from 1.0 mm to 10.0 mm, generate 200 viewpoints at horizontal and vertical direction for an eye, and alter the binocular distance from 40.0 mm to 75.0 mm.
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  • Perception of curved surface depending on viewing distance
    Hatsuho Aoshima, Shunji Satoh
    Session ID: 3DIT2017-5,HI2017-49
    Published: 2021
    Released on J-STAGE: May 26, 2021
    DOIhttps://doi.org/10.11485/itetr.41.08.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We investigated the perceptual difference of cylindrically curved surfaces of random-dot-stereograms (RDS) and real objects. The ‘real’ objects used in this study are transparent sheet filled with with random-dots, and the objects are illuminated by the back light emitted from a LED monitor. In experiments of this study, human subjects observed cylinders of five kinds of radii with three different viewing distances. Experimental results indicate that the perceptual difference of depth between RDSs and real objects depends on the viewing distance and the visual angle of objects. Moreover, we find a mathematically simple description of perceived surface, viewing distance and visual angle of objects. As an application of virtual reality, we propose a method computing horizontal difference of RDSs which could be perceived as the same surfaces of real objects.
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  • The effect of relative binocular disparity on motion in depth
    Jumpei Konno, Takaaki Kondo, Shigehito Tanahashi
    Session ID: 3DIT2017-6,HI2017-50
    Published: 2021
    Released on J-STAGE: May 26, 2021
    DOIhttps://doi.org/10.11485/itetr.41.08.0_21
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The present study investigated the effect of relative binocular disparity on motion in depth, when the absolute disparity of either of the stimuli, thus relative disparity of the two visual stimuli, are modulated. The six observers perceived motion in depth of the tracking stimulus, s/he moved the knob with unseen hand to match the perceived motion in depth of the stimulus during seven back-and-fourth simulated movements by disparity modulated. As the results, the relative binocular disparity and fixated stimulus did not affect the perceived motion in depth.
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  • Haptic Feedback on See-Through Autostereoscopic 3D Images by Electromagnetic Array
    Takuma OHASHI, Takafumi KOIKE
    Session ID: 3DIT2017-7,HI2017-51
    Published: 2021
    Released on J-STAGE: May 26, 2021
    DOIhttps://doi.org/10.11485/itetr.41.08.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We have proposed an autostereoscopic 3D imaging system which presents tactile feedback when operating with a fingertip by using magnetic force and experimented to confirm our method. In the system, it is possible to present the pulled feeling which was difficult to express by the conventional method. The system displays an aerial 3D image using a half mirror by a virtual image of the autostereoscopic 3D image displayed using a liquid crystal panel and a lenticular. An electromagnet array is installed under the half mirror and each electromagnet is controlled. This makes it possible to realize tactile feedback to the user who attached a magnetic object to a fingertip, assist the manipulation of the aerial image with more accurate touch operation. In this paper, we describe the outline of the system and the principle experiment for implementation and its result.
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  • Analysis of subjective evaluation of visual fatigue by stereoscopic images －Using the questionnaire developed by Ohno and Ukai (2000)－
    Hiroyasu UJIKE, Hiroshi WATANABE
    Session ID: 3DIT2017-8,HI2017-52
    Published: 2021
    Released on J-STAGE: May 26, 2021
    DOIhttps://doi.org/10.11485/itetr.41.08.0_29
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Visual fatigue caused by stereoscopic images is known to induce various symptoms, and then, for the subjective evaluation, Ohno and Ukai had developed a questionnaire consisting of 28 items of symptoms to be subjectively evaluated. In this study, based on some results of the Ohno and Ukai’s questionnaire during watching stereoscopic images, we try to extract feature values by factor analysis as Kuze and Ukai (2008) had tried to do, and also consider to narrow down the items.
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  • Three-Dimensional Image Technology(3DIT)/Human Information(HI)
    Pages 31-
    Published: 2021
    Released on J-STAGE: May 26, 2021
    DOIhttps://doi.org/10.11485/itetr.41.08.0_31
    CONFERENCE PROCEEDINGS FREE ACCESS
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