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Katsuyuki Egawa
2005 Volume 59 Issue 4 Pages
495-500
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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Yoshiki Shibuya, Takashi Andou, Masaru Kanazawa, Kimio Hamasaki, Tadas ...
2005 Volume 59 Issue 4 Pages
501-507
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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Akio Yamakawa
2005 Volume 59 Issue 4 Pages
508-512
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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The First Experiential Video Space in the World
Tetsuya Okamura
2005 Volume 59 Issue 4 Pages
513-517
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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“What if the Moon Didn't Exist?”
Yutaka Okuda, Terukazu Suzuki, Mitsugu Omori, Masahiro Katsuta
2005 Volume 59 Issue 4 Pages
518-521
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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Shigeo Morishima
2005 Volume 59 Issue 4 Pages
522-524
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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Akihiro Hori, Yoshiharu Dewa
2005 Volume 59 Issue 4 Pages
525-531
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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Shiho Moriai
2005 Volume 59 Issue 4 Pages
532-537
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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Kunimaro Tanaka
2005 Volume 59 Issue 4 Pages
538-541
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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Hiroshi Matsuda, Yoshiaki Shindo
2005 Volume 59 Issue 4 Pages
559-565
Published: April 01, 2005
Released on J-STAGE: August 17, 2011
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To improve and augment elementary school level computer-based education classes, we developed a new educational support tool named Cyber Theater and the script language named Cyber Theater Scenario Language (CTSL). Cyber Theater enables to produce the 3DCG animation easily, which includes virtual actors who can speak by using speech synthesizer, virtual stages, stage parts, sound effects, and the background music. The scenario of animation story can be written by using CTSL. CTSL is a Tag-based hypertext language like the HTML language. At first, we developed several 3DCG animations stories for children. As a result of this work, we integrated the 3DCG contents (Actors, Stages, and Stage parts) to the database named Cyber Theater gallery. By using Cyber Theater, CTSL, and Cyber Theater gallery, we designed the Creative Lesson, where upper-aged pupils (including junior high school and high school) studied how to make a 3DCG animation and produced their original animation stories as their short presentation. Moreover, as a teaching material of Creative Lesson, we have developed the CTSL Learning Kit (CLKit), which includes several sample scenarios written by using the CTSL. It is designed for learning how to make a 3DCG animation step by step. In this paper, we report the design details of Cyber Theater, CTSL, the results of Creative Lesson's experiment, and the CLKit.
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Chihiko Yamada, Haruo Isono
2005 Volume 59 Issue 4 Pages
566-568
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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Depth reproducibility is an important consideration in evaluating 3D display systems. A binocular parallax 3D display does not require viewers to wear special glasses to see 3D images, but there have been very few quantitative analyses of its depth reproducibility. In this study we quantitatively analyzed the depth reproducibility in a parallax panoramagram. The results showed that with a parallax panoramagram, depth-reproduced images look less compressed or stretched out. These findings indicate that a binocular parallax 3D display is more suited to a parallax panoramagram 3D display system.
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Masaru Kojima, Takeshi Naemura
2005 Volume 59 Issue 4 Pages
569-580
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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Image-based rendering (IBR) is a technique for synthesizing arbitrary views of real scenes from a set of pre-acquired images. We have proposed a real-time IBR system using a lens array, which can capture thousands of multiple viewpoint images of a 3D scene. The quality of synthesized images depends on the configuration of the optical system, but detailed analysis based on optics has not been proposed. In this paper, we formulate the upper limit of the spatial frequency captured by the optical system by analyzing the blurring effect and the sampling effect on the image sensor. Based on this result, the trade-off relationship between several system features is clarified, which is applicable to the configuration of the capturing system. We examine our theory by experiment using the actual system.
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Hirotake Yamazoe, Akira Utsumi, Kenichi Hosaka, Masahiko Yachida
2005 Volume 59 Issue 4 Pages
581-587
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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We propose an automatic camera calibration method to determine the position and orientation parameters of a newly installed camera in our hand gesture tracking system. In a multiple camera-based system, automatic camera calibration algorithms are required due to the increasing cost of camera calibration. In our method, both 3D position tracking results and 2D positions and sizes on camera image planes are used for the calibration. By using 2D width information for camera calibration, the calibration results stabilize even if the input data includes large observation errors. Observations by the newly installed camera are taken into account while tracking to increase the reliability of the calibration result. Using this method, the cost of installing new cameras in a hand tracking system can be effectively reduced and we can easily add new camera (s) to the hand gesture tracking system. Moreover, the hand tracking accuracy can be improved and the tracking area can be widened by camera addition. Experimental results show the effectiveness of the proposed method.
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Yuji Sakamoto
2005 Volume 59 Issue 4 Pages
588-591
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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We propose a conjugate image elimination method for computer generated holograms by spatial frequency filtering. The method, a hologram-data calculation algorithm, does riot require special optical equipment. Moreover, any object modeling or object light calculation method can be used.
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Shakil A. Hannan, Daisuke Endou, Masanobu Yamamoto
2005 Volume 59 Issue 4 Pages
592-603
Published: April 01, 2005
Released on J-STAGE: August 17, 2011
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Traditional storyboards are considered the blueprints of live action movie shooting for narrative storytelling, but they have limitations. In addition, the conversion of storyboards to motion picture cinematography consumes time and money. We propose a more advanced tool than storyboards : the Shot Evaluation and Development System, which not only reduces the time and cost of live action shooting, but also helps a director to increase his or her artistry and creativity through the exploration of placements and movements of actors and cameras that best suit the storytelling. Because the system includes the motion of virtual cinematography, it is better than storyboards at communicating with cinematography departments in live action shooting. The pace of a moving shot along with the movements of actors, generated by motion data, influences the way a director orders shots to develop an appropriate rhythm in a sequence, and that helps a director make a proper judgment in developing a scene at the pre-production stage of filmmaking.
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Weixing Xia, Junji Numazawa, Hajime Aoi, Hiroaki Muraoka, Yoshihisa Na ...
2005 Volume 59 Issue 4 Pages
604-609
Published: April 01, 2005
Released on J-STAGE: August 17, 2011
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Basing on the commercial software JMAG-Studio, we have developed a program in which the magnetization of magnetic particles is introduced into calculations of magnetization distributions in media. This allows us to three-dimensionally analyze perpendicular magnetic recording mechanisms. Even though the media magnetization is introduced into the FEM calculation, the obtained solutions are convergent. In the calculation, the head and media interactions and the demagnetization during the recording process can be accurately considered. Using our program, factors that influence recorded track widths in perpendicular magnetic recording were investigated. Decreasing the magnetic spacing and using a side-shielded head structure are effective ways to reduce the track width in a single-pole head and double layer perpendicular media recording system.
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Naoki Ono, Kiichi Urahama
2005 Volume 59 Issue 4 Pages
610-613
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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In conventional fuzzy Hough transforms, lines are detected using a sequential iteration method that deletes data points on the detected lines. Detecting another line intersecting the detected lines is difficullt because some data points have been deleted in the previous process. We propose a fuzzy Hough transform method that preserves all the data in the iterative detection process. In addition, parameters of lines are refined so that the lines fit the data point pattern better than by using the conventional sequential iteration method.
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Tsunehito Higashi, Yasuhiro Shimada, Kiyotaka Okabe
2005 Volume 59 Issue 4 Pages
614-619
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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The shape of a linear drawing consisting of equal line segments is determined by the distribution of angles between adjacent line segments. Linear drawings of arbitrary shapes were generated using a genetic algorithm that designed the distributions of angles. Linear drawings that resembled the shapes of targeted linear drawings were obtained by comparing components of a Walsh conversion of the angle distribution of each linear drawing.
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Mingxie Zheng, Toshiyuki Gotoh, Noriko Shimomura
2005 Volume 59 Issue 4 Pages
621-628
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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An algorithm of vehicle type recognition integrating on-board sensor information is proposed. This method, compensates for apparent size differences due to the objective distances of on-board sensors, the distance and intensity detected by a scanning laser radar, and the images input from an on-board CCD camera. A frame recognition which consists of a multiplex structured neural network using the three kinds of adjusted data is performed, then the results are integrated to improve the accuracy of the recognition of each object. Experiments using road images captured while driving and the sensing data show that this method is effective : average recognition rates were above 96.1% for various road environments.
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Service Concept and Possibility of User Acceptance
Amy Tzu Ya Huang, Sakae Okubo, Wataru Kameyama
2005 Volume 59 Issue 4 Pages
629-637
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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Rapidly emerging IP-based broadband technologies allow multimedia communications between viewers and TV broadcasting stations as well as among viewers. Talk-back and Talk-together TV systems provide new forms of interactive broadcasting services and enhance the current experiences of TV viewing. We first defined Talk-back and Talk-together TV systems and then analyzed their possible service scenarios for extracting required system functionalities. Furthermore, we carried out a Talk-together TV system experimental study that examined user reactions to the Talk-together TV sessions on quiz and soccer programs by connecting the subject viewers with different communication media; none, text-only, audio, audiovisual, physically together. The results indicate that there are future possibilities of user acceptance for the new TV services that utilize bidirectional multimedia links among viewers.
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Takaaki Suzuki, Hideo Fujikake, Takeshi Murashige, Hiroto Sato, Hirosh ...
2005 Volume 59 Issue 4 Pages
638-642
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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We fabricated reflective display devices using twisted-alignment guest-host liquid crystal with low refractive index anisotropy and evaluated their electro-optic properties. The dark state reflectance of the devices was reduced to 1/3 by using the liquid crystal (containing dichroic dye) with low refractive index anisotropy. The bright state reflectance could keep more than 50% by using liquid crystal with a high alignment order parameter. These results indicated that high-contrast reflective display devices can be made using a liquid crystal material with low refractive index anisotropy and a high order parameter.
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Toshikazu Korekado, Toshio Nakao
2005 Volume 59 Issue 4 Pages
643-646
Published: April 01, 2005
Released on J-STAGE: March 14, 2011
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To study the relationship between electromagnetic waves and fire plasma, we heated a small space between the core wires of a square coaxial line and the temperature, ionization electron density, and frequency each had an effect on the transmission characteristics.
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