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Article type: Cover
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Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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Article type: Index
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Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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Yuki Hayashi, Yasuhiro Takaki
Article type: Article
Session ID: 3DIT2008-65/IDY2008-
Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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We have already proposed the wide viewing angle holography using the resolution redistribution optical system. The horizontal resolution was increased to approximately 16,000 and horizontal viewing angle was increased to approximately 15.4°. The resultant three-dimensional images could be observed by both eyes. Because holography using coherent light can produce a sharp three-dimensional image in the three-dimensional space, it is expected that the accommodation-vergence conflict does not occur. In the present study, we measured the accommodation responses to holographic images produced by the resolution redistribution optical system.
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Yumi TANEMOTO, Yasuhiro TAKAKI
Article type: Article
Session ID: 3DIT2008-66/IDY2008-
Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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For electronic holography using the single-sideband method, the hologram calculation method using the Fourier transform enables to eliminate a conjugate image completely and to reconstruct an object wave with an arbitrary complex-amplitude distribution. We found a variety of band-limited zoneplates other than the half-zoneplate can be used. We also found that the use of a zoneplate interpolated from a zoneplate sampled with the sampling pitch twice as much as the pixel pitch of a SLM can generate a reconstructed image with little deterioration.
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Takeshi NAEMURA
Article type: Article
Session ID: 3DIT2008-67/IDY2008-
Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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3D imaging technologies have developed from progress of various related researches. This paper presents the TransCAIP system which can display live video sequences as well as precomposed contents on an auto-stereoscopic 60 view display. This is achieved by high speed computation from 64 live video inputs, which is recently called as the research field of computational photography.
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Masami Yamasaki, Hideyuki Sakai, Kei Utsugi, Takafumi Koike
Article type: Article
Session ID: 3DIT2008-68/IDY2008-
Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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We propose a method to increase image resolution of an autostereoscopic display without increasing the density of micro lenses. Multiple projectors are used for multiple real images to be laid on a surface in the air behind a light deflecting device. The overlaid multiple projection images yield light spots inside the region of a micro lens. This property provides scalable high resolution image by increasing the number of projectors. We describe some characteristic aspects of the calibration method that plays central role in such a projector based display system.
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Miwa KATAYAMA, Yuichi IWADATE
Article type: Article
Session ID: 3DIT2008-69/IDY2008-
Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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We are investigating how to convert 3D models into stereoscopic images of integral photography (IP) using the OpenGL API. This system consists of a high-resolution liquid-crystal panel and a lens array. In this paper, we discuss the method for converting 3D models into IP images and report experimental results.
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Tomonari SAWADA, Kana Ito, Masakatsu NAKAYAMA, Shoji KAWAHITO
Article type: Article
Session ID: 3DIT2008-70/IDY2008-
Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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In Time-of-Flight (TOF) range image sensors using periodical pulsed light, there is a trade-off between the maximum range and range resolution. This paper proposes a range-shift technique for improving range resolution of the TOF range image sensor without sacrificing the measurement range. The range-shift operation uses a TOF range imaging pixel with periodical charge draining structure and several time-shifted short pulses. The use of the short pulse can improve the range resolution. The range image using the range-shift technique is synthesized with several sub-frames, each acquires one of the shifted range images. The use of the small duty-ratio pulse leads to reducing the effect of ambient light and improving the range resolution. The range-shift technique is tested with an implemented TOF range image sensor and it is found that the range resolution is improved to 2cm using a 10ns light pulse and 7 overlapped shifted ranges for the measurement range of 0.5m to 4.0m.
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Ryoichi HORISAKI, Yoshizumi NAKAO, Takashi TOYODA, Keiichiro KAGAWA, Y ...
Article type: Article
Session ID: 3DIT2008-71/IDY2008-
Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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A compound-eye imaging system which consists of a lens array and a single imager has a thinner and more compact hardware than those with multiple imagers or mainlens in front of the lens array. However, the issues of the system are reconstruction of high-resolution images and accurate range finding to overcome its short baseline. In this paper, we show an irregular lens-array arrangement to alleviate sampling points degeneration for far object and a method for accurate range finding incorporated with super-resolution processing. The experimental results show that the power spectrum at 0.25/pixel is improved by 6.7 dB and the average error at a distance of 3.2m is 0.2m. The error is lower than that of a conventional stereo camera with a same baseline of our system.
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Shiro SUYAMA
Article type: Article
Session ID: 3DIT2008-72/IDY2008-
Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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To realize a practical 3-D display system, we consider that it is necessary to combine a construction of 3-D image on a space and method utilizing 3-D visual illusion. In this paper, as examples of individual technologies, we present 3-D display using a varifocal lens and DFD (Depth-fused 3-D) display. In DFD display, we mention a basic phenomenon of visual illusion, a protruding 3-D display, a large area display and depth perception when both eyes have a visual acuity difference. In 3-D display using varifocal lens, we explain basic structure, driving method of liquid-crystal lens (key device), simple 3-D images and a new driving method of key device.
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Hiroyuki NAGATANI, Takashi Fujikado
Article type: Article
Session ID: 3DIT2008-73/IDY2008-
Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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We developed an autostereoscopic display based on the integral imaging (II) method to give horizontal parallax. There is some anxiety about visual fatigue from stereoscopic images. We have also evaluated the safety of the stereoscopic vision. This paper reports, application of autostereoscopic display based on II method to the training equipment for the medical treatment. It is an attempt of the recovery of the binocular vision performance for a strabismus or amblyopia (lazy eye) patient.
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Jun ARAI, Masahiro KAWAKITA, Fumio OKANO
Article type: Article
Session ID: 3DIT2008-74/IDY2008-
Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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In integral imaging, we use a lens array both for capturing an object and for reconstructing an image. In principle, the 3D image is reconstructed where the object was. We present a method for controlling the depth of 3D images using captured image data processing. Firstly, the light rays from the objects are reconstructed by numerical processing from the captured images and the first virtual lens array. Next, the 3D information in accordance with the desired depth is generated from the reconstructed light rays. These calculations are performed based on a geometrical optics. Experimental results show that the depth of the 3D image was arbitrarily controlled by the proposed method.
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Article type: Appendix
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Published: October 21, 2008
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Article type: Appendix
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Published: October 21, 2008
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Article type: Appendix
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Published: October 21, 2008
Released on J-STAGE: September 20, 2017
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