ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
23.3
Showing 1-15 articles out of 15 articles from the selected issue
  • Type: Cover
    Pages Cover1-
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Type: Index
    Pages Toc1-
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Yasuyuki KIYOSUE, Shohei SUGAWARA, Shigeki MASAKI, Susumu ICHINOSE
    Type: Article
    Session ID: MIP99-1/AIT99-1/NIM9
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    InterSpace^<TM> is an advanced networked virtual reality system that presents shared three-dimensional computer graphics (CG) worlds via the Internet where multiple users can enjoy synchronous communication with voice, video and text. Users can control their avatars as a surrogate interface. In InterSpace users can walk around and interact with other people and interact with contents. In this paper, we describe the function-distributed architecture used in InterSpace. The architecture enables flexible configuration of server functions and load distribution. It also allows users to select media and client PCs to switch servers dynamically.
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  • Tomohisa Hoshi, Takashi Komatsu, Takahiro Saito
    Type: Article
    Session ID: MIP99-2/AIT99-2/NIM9
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We present a practical method for removing blotches and restoring their missing data. To detect blotches, we employ a robust approach of local analysis of spatiotemporal anisotropic brightness continuity. Our approach uses first-order spatiotemporal directional derivatives to select the smoothest direction for each examined pixel, and puts out the incorruption probability that the examined pixel may not be corrupted by blotches. As the restoration filter, we employ a spatiotemporal fuzzy filter whose response is adaptively controlled according to a fuzzy rule defined by the incorruption probability. The fuzzy filter is composed of the two different filters of the identity filter and the spatiotemporal directional-weighted-mean filter, and will put out an intermediate value between the original input brightness and the directional-weighted-mean brightness. We design the fuzzy rule in advance by a standard supervised learning method. The computer simulations are presented.
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  • Junji Kawasaki, Hiroshi Hayashi, Akira Hayashi, Makoto Sato, Taizo IIj ...
    Type: Article
    Session ID: MIP99-3/AIT99-3/NIM9
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    When we see a binary black and white image, it appears, to our visual sense, to become clearer because of a pseudo halftone. This is because when we don't notice of all the details of the image, instead we see from a more global standpoint. We presented a theory and experimental results for layered model which extended external world, retina and brain of the two dimensional visual model. This paper propose the objective evaluation to coincide with the subjective evaluation of the human in ordered to evaluate the relative merits of the various modulation method. We obtain experimentally the restored images and the measure of approximation of the density four division and ordered dither method. The measure of approximation presents the objective evaluation scale to coincide with the subjective evaluation of the two modulation images.
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  • Kiyoshi Hoshino
    Type: Article
    Session ID: MIP99-4/AIT99-4/NIM9
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    To clarify the motion characteristics of free-style Okinawan dance "Kachaasi", first, the subjective impression was quantitatively evaluated with semantic differential technique to cluster its types. Then, the contingency of joint rotation in shoulder, elbow and wrist joints was examined with multivariate autoregressive model. The time-series data of positions and angles of three joints were calculated according to the deforming conditions and shielding directions of the ring lights. As the results, in an excellent dancer, the motions of shoulder and elbow were highly synchronized and smoothly controlled. The low-frequency output of the shoulder and elbow were mutually interacted. Meanwhile, the wrist behaved independently of other joints'rotation.
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  • Kousuke Imamura, Yuuji Tanaka, Hideo Kuroda
    Type: Article
    Session ID: MIP99-5/AIT99-5/NIM9
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Fractal coding is image compression techniques using one of image characteristics self-transformability. In fractal image coding, the encoding process is to select the domain block similar to a range block. The reconstructed image quality of fractal image coding depends on similitude between a range block and the selected domain block. Domain block estimating function is used for selecting the domain block similar to a range blocks. In fact, the error of the reconstructed image adds up the generated error in encoding process and the generated error in decoding process. But current domain block estimating function considered only the encoding error. We propose a domain block estimating function to consider not only the encoding error but also the decoding error. By computer simulation, it was verified to obtain the high quality reconstructed image.
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  • Naoki Kobayashi, Satoshi Ishibashi, Susumu Ichinose
    Type: Article
    Session ID: MIP99-6/AIT99-6/NIM9
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    MPEG-2 transcoding scheme is proposed as scalable transmission system for a video-on-demand system is described. In this system video contents encoded by MPEG-2 are transmitted to receiver terminals via communication lines that have different bit rate. A transcoding technique that directly converts a bit stream encoded by MPEG-2 into a lower coding rate stream without decoding is proposed. The transcoder called Trampeg includes size reduction and frame drop approach. The experimental results show that an MPEG-2 stream of 6 Mbps is able to be transcoded into a stream of 1.5 Mbps-300 Kbps.
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  • Ichiro Matsuda, Susumu Itoh
    Type: Article
    Session ID: MIP99-7/AIT99-7/NIM9
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper proposes a new region-oriented coding scheme of still images. The scheme first segments an image into homogeneous regions by making use of Voronoi diagrams. Then luminance components in each Voronoi region are encoded using a transform coding technique which employs the Schmidt's orthogonalization method to produce orthonormal basisfunctions for arbitrarily shaped regions. In this technique, coding efficiency depends on the properties of initial vectors to be orthogonalized. Therefore we adaptively select a set of initial vectors as well as the order in which these vectors are orthogonalized. Simulation results indicate that the proposed coding scheme achieves higher coding performance with much less computation than the KLT-based scheme which we reported formerly.
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  • Wentao Zheng, Yoshiaki Shishikui, Yasuaki Kanatsugu, Yutaka Tanaka
    Type: Article
    Session ID: MIP99-8/AIT99-8/NIM9
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Information about camera operating such as zoom, focus, pan, tilt and tracking is useful not only for efficient video coding, but also for content-based video representation. A camera operating parameter measurement system designed specifically for these applications is therefore developed. This system, implemented in real time and synchronized with the video signal, measures the precise camera operating parameters. We calibrated the camera lens using a camera model that accounts for radial lens distortion. The system is then applied to infer image motion from pan and tilt operating parameters. The experimental results show that the inferred motion coincides with the actual motion very well, with an error of less than 0.5 pixel even for large motion up to 80 pixels.
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  • Kengo Shibata, Takashi Azakami
    Type: Article
    Session ID: MIP99-9/AIT99-9/NIM9
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The authors have considered the 1/f fluctuation of vital rhythm with 1/f^β spectrum of α wave in relation to the invigoration for the learning memory by paid their attension to the hippocampus protocol in this paper. At the first clinical experiment, the data of the remembrance test at short period is able to make as the foundation of the repeat memory. It can replace this memory with long period memory through the hippocampus by the superposition of the same memory-nerve circuits.
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  • Masayuki HASHIMOTO, Atsushi KOIKE, Shuichi MATSUMOTO
    Type: Article
    Session ID: MIP99-10/AIT99-10/NI
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper proposes an efficient coding scheme for remote medical communication systems, or "telemedicine systems". These systems require a technique which is able to transfer a large volume of data such as X-ray images effectively. We have already developed a hierarchical image coding and transmission scheme (HITS), which achieves an efficient transmission of medical images simply[1]. In this paper, a new coding scheme for HITS is proposed, which used hierarchical context modeling for the purpose of improving the coding efficiency. The hierarchical context modeling divides wavelet coefficients into several sets by the value of a correspondent coefficient in their higher class, or "a parent", optimizes a Golomb-Rice (GR) code parameter in each set, and then encodes the coefficients with the parameter. Computer simulation shows that the proposed scheme is effective with simple implementation. This is due to the fact that a wavelet coefficient has dependence on its parent. As a result, high speed data transmission is achieved even if the telemedicine system consists of simple personal computers.
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  • Shigeo MORISHIMA
    Type: Article
    Session ID: MIP99-11/AIT99-11/NI
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Recently computer can make cyberspace to walk through by an interactive virtual reality technique. An avatar in cyberspace can bring us a virtual face-to-face communication environment. In this paper, an avatar is realized which has a real face in cyberspace and a multi-user communication system is constructed by voice transmission through network. Voice from microphone is transmitted and analyzed, then mouth shape and facial expression of avatar are synchronously estimated and synthesized on real time. And also an entertainment application of a real-time voice driven synthetic face is introduced and this is an example of interactive movie. Finally, face motion capture system using physics based face model is introduced.
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  • Peisuei Lee, Masayuki Nakajima
    Type: Article
    Session ID: MIP99-12/AIT99-12/NI
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper proposes an evolutionary model for automatically generating artificial creatures of various shapes and colors according to insect ecology. This model offers a novel way to naturally evolve the shapes and colors of artificial creatures. The evolutionary model used in our research is based on Genetic Algorithms(GA). In this paper, artificial Computer Graphics(CG) creatures develop into various shapes and colors according to the evolutionary model. Later, they can be used as CG animated characters. This model also solves the problem of reducing the time and labor cost for mass production of various characters. It could be used in such areas as the cavalry battle scene in Disney's animation, "Mulan." Our approach has two steps. At first, artificial creatures move according to information gathered from the five senses. This information is also used for generating the shapes of the five sense organs[1]. Then, based on the GA, evolutionary model[2], we prepare prototype creatures, which evolve into various shapes and different colors in alternating generations. Finally, our evolutionary model successfully generates various character shapes and colors automatically.
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  • Type: Appendix
    Pages App1-
    Published: January 21, 1999
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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