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Article type: Cover
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Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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Article type: Index
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Published: March 02, 2010
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Nobutaka Natsui, Kazuo Isikawa, Toyohiko Hatada
Article type: Article
Session ID: 3DIT2010-27/HI2010-7
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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When we observe it using stereoscopic display such as HMD, we feel an unnatural three-dimensional impression and may say a different three-dimensional impression every observer. Therefore we had what kind of relation to the distance perception of the target by a camera interval and a interpupillary distance or evaluated it when we changed a camera interval and changed a three-dimensional impression. As for the quantity of depth, it was with the tendency that became large so that a camera interval left it, and the result that was near to a theoretical value in the case of distance same as a background a target was provided. In the case of the front and rear, the tendency that quantity of depth was not stable was seen than a target a background.
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Hideaki KOBAYASHI, Kikuo ASAI
Article type: Article
Session ID: 3DIT2010-28/HI2010-7
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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The purpose of this paper is to compute depth presentation position of stereoscopic images which subjects feel comfortable. We used two types of stereoscopic devises to experiment. We examine the subject's favorite point by method of adjustment. As a result, we compute depth presentation position of stereoscopic images which subjects feel comfortable on the same contents. Although there are differences among individuals, it is proved that there are two preferences in depth presentation position, which are in front of the display screen and set into the screen.
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Hirokazu HASHIKAWA
Article type: Article
Session ID: 3DIT2010-29/HI2010-7
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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We made the optical device was composed of a pair aggregates of the rectangular micro mirrors. The projected real image was focused by this transmissive-retro-reflectors. Then we researched on this device. The maximum resolution was 2 point/mm. The maximum projection range was about 600mm. The effective view angles are +/-19 degrees in vertically, +/-15 degrees in horizontally..
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Hirokazu HASHIKAWA
Article type: Article
Session ID: 3DIT2010-30/HI2010-7
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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We made the 3D real image with the depth information as same as that of the object by using a pair of the transmissive-retro-reflectors. This image was focused in front of the optical devices. And we were able to alter the magnifying power of the real image by using the combination of the transmissive-retro-reflectors and the traditional optical device. In these examinations, we knew that we were able to select a real image or a virtual image as an output image by modifying the distance between the optical device and the object.
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Kenji KINOSHITA
Article type: Article
Session ID: 3DIT2010-31/HI2010-7
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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Calculation methods of simplifying interference fringe computation were proposed for Fresnel CGHs used two-dimensional image data. The interference fringes of the CGH are the superposition of many Fresnel zone plates. As these interference fringes form parallel patterns, there is much redundancy in the CGH. If we consider this property, we need not to calculate all points of the CGH. We may calculate the interference fringes of the CGH only at regular intervals. Although a dark ghost image is generated from this CGH in numerical image reconstruction, this ghost image does not affect to check the quality of a reconstructed virtual image. Therefore, the proposed methods are useful to decrease computation time of the interference fringes in computer simulation.
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Kentaro KOZAKO, Yasuhiro TAKAKI
Article type: Article
Session ID: 3DIT2010-33/HI2010-8
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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When a frame rate decreases or a image movement velocity increases, a jerky movement called "jerkiness" is perceived. A number of researches have been done to characterize the jerkiness of 2D images. However, the jerkiness of 3D images has not been much studied. The aim of this research is to characterize the jerkiness of a high-density directional display that has been developed as a natural 3D display. We previously reported the results of the subjective evaluations under the static viewing condition as a preliminary. In this paper, we conducted subjective evaluations under the dynamic viewing condition. When the direction of the apparent movement of 3D images on the display screen caused by the head movement and that of the movement of 3D images were equal, the detection threshold and the tolerance threshold for the image velocity increased. When they were opposite, the detection threshold and the tolerance threshold decreased.
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Masashi Tsuboi, Tsutomu Horikoshi
Article type: Article
Session ID: 3DIT2010-34/HI2010-8
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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We propose a method to analyze a shape of lobes of multi-view type 3D display based on the luminance distribution from the display surface. Proposed method can be adopted for the quantitative characterization of the viewing space of integral-type 3D display, which is designed to show several view images to the observer. In this paper, we introduce the details of proposed method, and the experimental results of proposed method are shown.
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Hiroshi WATANABE
Article type: Article
Session ID: 3DIT2010-35/HI2010-8
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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In this paper, studies of spatial perception using with the immersive type of virtual reality system was introduced. We argued that the empirical data concerning the distortion of spatial perception due to vection, the issues of motion sickness and its reduction method, and, finally, the activity of ISO "Image Safety".
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Haruki MIZUSHINA, Ippei NEGISHI, Hiroshi Ando, Takanori KOCHIYAMA, Shi ...
Article type: Article
Session ID: 3DIT2010-36/HI2010-8
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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The conflict between accommodation and vergence is one of the possible causes of visual fatigue while viewing stereoscopic display. To know how much conflict is acceptable for safe and comfortable viewing, we need to compare accommodation and vergence responses while viewing stereoscopic images to those while viewing objects at real distances. In this study we measured accommodation and vergence responses while viewing a visual target located at real distances and simulated distances presented on a stereoscopic display. We also showed that the display frame had no effect on accommodation and vergence responses while viewing stereoscopic display.
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Naoki Asaba, Yasuhiro Takaki
Article type: Article
Session ID: 3DIT2010-37/HI2010-8
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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A super multi-view (SMV) 3D display technique was proposed as a natural 3D display technique to solve the visual fatigue problem caused by the accommodation-vergence conflict. Previously, most measurements of accommodation response to SMV display were carried out on the condition that observer was close to viewpoints. In this study, we measured the accommodation response to SMV display with observer and viewpoints separated using the 128-viewpoints multiple projection SMV display which we had achieved. Especially, we did the experiments for several screen-viewpoints distance conditions because the screen-viewpoints distance can be modified easily on this SMV display. The measured results showed that the accommodation function worked properly in the enhanced range of the depth of field of eyes that was determined by the extent of rays at the observation distance.
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Shin-ichi UEHARA
Article type: Article
Session ID: 3DIT2010-38/HI2010-8
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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Members of Japanese mirror committee for ISO/TC 159 are engaged in international standardization activities for 3D displays. We consider that for a sound development of 3D displays' market, the standards should be based on not only mechanism of 3D displays, but also human factors for stereopsis. However, we also think that there is a lack of common understanding on what the 3D display should be and that the situation makes developing the standards difficult. In this paper, we focus on ergonomics of 3D displays and their standardization issues in terms of performance characteristics, measurement methods, evaluation methods and requirements.
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Tomoyoshi SHIMOBABA, Tomoyoshi ITO, Nobuyuki MASUDA, Yasuyuki ICHIHASH ...
Article type: Article
Session ID: 3DIT2010-39/HI2010-8
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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In this paper, we report fast calculation of a computer-generated-hologram using a new architecture of the HD5000 series GPU (RV870) made by AMD and its new software development environment,. Using a RV870 GPU and OpenCL, we can calculate 1,920×1,024 resolution of a CGH from a 3D object consisting of 1,024 points in 30 milli-seconds. The calculation speed realizes a speed approximately two times faster than that of a GPU made by NVIDIA.
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Kensuke IKEYA, Kensuke HISATOMI, Miwa KATAYAMA, Yuichi IWADATE
Article type: Article
Session ID: 3DIT2010-40/HI2010-8
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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In this paper, we propose a disparity estimation method using hierarchical belief propagation (BP) and Zero-mean Normalized Cross-Correlation (ZNCC). Experimental results show that the proposed method is robust against luminance level difference among stereo camera images. This method is utilizable for generation of 3D models and their display on 3DTV using Integral Photography (IP).
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Kazuaki YAMAMOTO, Takafumi KOIKE, Kunihiro NAGATA, Mizue EBISAWA, Taka ...
Article type: Article
Session ID: 3DIT2010-41/HI2010-8
Published: March 02, 2010
Released on J-STAGE: September 21, 2017
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PLZT attracts many researchers as a promising material for optical devices because of its useful characteristics: it changes its own refractive index depending on applied voltage by the Kerr effect. First, we examined the characteristics of simple PLZT. Then, we made a high-speed varifocal lens with PLZT which was significantly improved from what we reported before. We employ the novel lens-structure so that we can avoid undesirable deforming of the lens due to piezoelectric effects. We evaluated the characteristics of the lens quantitatively.
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Article type: Appendix
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Published: March 02, 2010
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Article type: Appendix
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Published: March 02, 2010
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Article type: Appendix
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Published: March 02, 2010
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