ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
24.1
Showing 1-20 articles out of 20 articles from the selected issue
  • Type: Cover
    Pages Cover1-
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Type: Index
    Pages Toc1-
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Yao-Xun Chang, Zen-Chung Shih
    Type: Article
    Session ID: MIP2000-1/AIT2000-1/
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Today's photorealistic rendering techniques can produce very impressive images. But the rendered objects are often too clean and too shining. In this paper, we propose a physically-based model to simulate the appearance of layered patinas on ancient Chinese bronzes. Been buried in soil for thousands of years, there are a lot of patinas on the surfaces of ancient bronzes due to the aging processes and physical and chemical conditions of soil environment. In this model, based on the environmental factors and object geometry, we modulate the development of patinas by L-systems according to these tendencies. We also demonstrate our procedual approach on the ancient Chinese bronzes founded at San-hsing-tui.
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  • Hussein Karam, Masayuki NAKAJIMA
    Type: Article
    Session ID: MIP2000-2/AIT2000-2/
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The art of ornamental patterns design of any culture has proven to be an elegant method for the study of symmetry. These patterns offer a rich source for exploitation by artists and are also of interest to mathematicians, crystallographers, architects, archaeologists and others. This paper describes some of the principles of ornamental patterns design, and explores ways in which these designs can be created algorithmically based on a proposed group theory folding technique. Our ornamental patterns are created in two steps: first, the geometry of the pattern is generated; second, this geometry is rendered in any number of styles. In addition, we discuss, the use of both isometrics and fold-type symmetry concept, to create and color such ornamental patterns. Experimental results demonstrate our approach with a variety of ornamental patterns design synthesis.
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  • Chih-Chung Yin, Wen-Kai Dai
    Type: Article
    Session ID: MIP2000-3/AIT2000-3/
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Considering global illumination in a dynamical environment, the hierarchical radiosity method is essential. In this paper, we propose a new scene partitioning scheme, light source beam, it enhances the hierarchical radiosity for dynamic environments. A significant integration of relationship in geometry between the light source and object surfaces simplifies the visibility calculation efficiently. Also, energy links we have to recalculation when a change in geometric occurs can be identified effectively. And, We create the visibility link to enhance the recalculation of energy links.
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  • Xiaohui ZHANG, Masayuki NAKAJIMA
    Type: Article
    Session ID: MIP2000-4/AIT2000-4/
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this paper, we present a new approach to simulate the daylight from sunrise to sunset based on a small set of photographs or CG generated images. The coherence character among image sequence at different times of day is employed, and each image under different illumination is thought to be expressed by two kinds of informations: common information and individual information. The color correction technique used in colorimetric is borrowed in this paper to relate color appearance from source image to color appearance under new illumination. A small set of photographs or CG synthesized images at different times of day are used as refernce images. From the reference images, a light-independent image, a shadow database and a color correction matrix database are constructed. Then new image at arbitrary time of day can be re-rendered quickly by executing shadow synthesis and color correction operation. Our result shows the daylight from sunrise to sunset can be simulated quickly without sacrificing the realism.
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  • Chen-Chin Feng, Cheng-Tai Shen, Shi-Nine Yang
    Type: Article
    Session ID: MIP2000-5/AIT2000-5/
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The radiosity method is mostly used as a global illumination model for diffuse environments. However its computation cost is too great for many applications. Specifically in dynamic environmants, where scenes are subject to modifications, existing static algorithms are not fast enough to provide a new global solution for interactive applications. This paper presents two hierarchical data structures to speedup the radiosity recomputation for a modified scene. The first data structure is the Hierarchical Link Structure that allows for easy determination of links which are potentially to be changed by scene updating. The second data structure is the Hierarchical Visibility Buffer that provides efficient visibility estimations in computing energy exchanges. Several experimental results are reported, which shows that the proposed approach is fast and effective. CR Categories: I.3.7[Computer Graphics]: Three-Dimensional Graphics and Realism-Radiosity; I.3.6[Computer Graphics]: Methodology and Techniques-Graphics data structures and data types, Interaction techniques
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  • Hyeok Beom Lee, Jisang Yoo
    Type: Article
    Session ID: MIP2000-6/AIT2000-6/
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    A normal face detection algorithm as an application of the still image processing techniques is presented in this paper. We define "normal face" as a face without sunglasses or a mask, and "abnormal face" as that wearing both, or either one of them. The proposed algorithm is composed of two stages: the eye detection stage and the mouth detection stage. We tried to apply it to the user identification procedure of ATMs (automatic teller machines), in order to distinguish non-acceptable users from the acceptable. Experimental results show that the proposed algorithm can distinguish abnormal faces from normal faces accurately from restrictive sample images.
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  • Seong Won Ryu, Ho Wook Jang, Young Ho Suh, Sang Gyu Park, Ee-Taek Lee
    Type: Article
    Session ID: MIP2000-7/AIT2000-7/
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We describe a new non-linear MPEG-2 editing system, for personal use and small business environments. The developed NLE system is based on Microsoft DirectShow components. The NLE system's various functionality are implemented based on common object model as known as COM. The editing shell system SOLGER is named after legendary Korean Painter. Primary purpose of the SOLGER system is manipulating various editing actions. In addition, it acts as DirectShow's filter graph generator and manager. The editing action is composed of simple drag and drop interface and menu driven graphic interface. Numerous special effects and transition effects are implemented as DirectShow filter component. These effects include 55 visual effects, 9 audio special effects, and 6 video transition effects. The visual special effects and the audio special effects could act as stand-alone DirectShow filter, and they could be incorporated to another system. Also, adding new special effect filter to the SOLGER MPEG-2 NLE is straightforward. The editing is done first with preview mode. In preview mode, the NLE system connects MPEG-2 bitstream to DirectShow's filter graph and special effects are rendered to video window and audio soundcards via the filter graph constructed as given GUI. The resulting filter graph can be saved and retrieved from the storage. In make-movie mode, rendered images and sounds are connected to MPEG-2 video encoder and MPEG-1 audio encoder. The bitstreams are stored in the disk storage and concatenated as user desires. The system is implemented in pure software on general-purpose multimedia personal computers. The MPEG-2 bitstream is selected as input and output format, for the future digital broadcasting system shall use MPEG-2 as standard format. As it uses components software as its building block, the system is cost effective, flexible, extensible and reusable. This NLE system provides economic solution to home entertainment family video editing and small business video editing.
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  • Kun-Cheng Tsai, Jen-Duo Liu, Chyou-Hwa Chen
    Type: Article
    Session ID: MIP2000-8/AIT2000-8/
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    For a video on demand (VOD) system we propose a scheme that adjusts begin of service time of user's requests and dynamically balances the load of the bandwidths on disks to achieving higher video throughput.Using round-based policy, the disks fill the buffer memory with data for each user per round. We consider the retrival of variable bit rate (VBR) video data from the disks in the server subject to the constrains that the disk bandwidth and buffer memory between server's disk and network subsystem. We find that our load balancing policies let a significant additional amount of throughput over both Constant Time Length (CTL) and Constant Data Length (CDL) round-based policies[1].
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  • Kun-Cheng Tsai, Jen-Duo Liu, Chyou-Hwa Chen
    Type: Article
    Session ID: MIP2000-9/AIT2000-9/
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    For a video-on-demand (VOD) system we propose a fast algorithm to solving the video assignment problem. The goal is to minimize the total cost, which consists of transmission cost and storage cost, while servers are limited capacity of storage and supply. In contrast to this attempt, our approach considers both the server storage cost and the network transmission cost. Our method incoeporates a simple and efficient modification to the basic subgradient search step. Preliminary analysis shows that for smaller-scale problems, the average percentage deviation from the best solution is 0.01% for our approach with only 100 iteration. Even though we cast our algorithm in a VOD setting problem, our method is appropriate to the other combinational optimization problems as well.
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  • Naoko Tosa, Ryohei Nakatsu
    Type: Article
    Session ID: MIP2000-10/AIT2000-1
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Now a days many Interactive Theater research is appeared[1][2][3][4]. We have developed an emotion-based interactive theater system. The characteristic is the use of Interactive Computer Grapfics technology and the generation of three-dimensional imagery to create autonomous actors and a cyberspace in which all participants obtain a feeling of immersion. We have developed a system that includes multi person participation, emotion recognition and gesture recognition through. In this system, participants can feel they are actually contributing to the development of the story in cyberspace. This is done a system that shows avatars on the screen as the alter egos of the participants. We have also produced an interactive story based on this system. We selected "Romeo and Juliet" by Shakespeare as the base story. The main plot of the story is as follws. After their tragic suicide, the souls of Romeo and Juliet are sent to Hades, where they have no recollection of the past. Then, Romeo and Juliet each start on a journey to rediscover themselves and what relationship they shared with their characters, who are emotion-based autonomous actors.
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  • Heedong Ko, Laehyun Kim, Moonho Park, Heyran Byun
    Type: Article
    Session ID: MIP2000-11/AIT2000-1
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this paper, we introduce a novel virtual studio environment in which an anchor in the virtual set interacts with televiewers as if they were sharing the same environment. A televiewers participates in the virtual studio environment by experiencing the input to and controlling the gaze direction of a dummy head equipped with camera, speaker and microphones. The dummy head as a surrogate televiewer, providing the viewpoint experienced by the televiewers via a video camera and the sound experienced by the televiewer via microphone in its head. The anchor can not only interact with the virtual set elements but also share the physical studio with the surrogate televiewers. With a head tracking, the televiewer may look around the virtual world and gaze at other avatars and anchors via its surrogate, the dummy head's gaze direction. The new interactive virtual studio with the immersive televiewer environment may be applied to immersive tele-conferencing, tele-education, and interactive TV program productions of the future.
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  • Hyun-seung Yang, Hyun Jin Park, Yong-jin Cho
    Type: Article
    Session ID: MIP2000-12/AIT2000-1
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    A cyber-character is a kind of artificial life inhabiting a virtual world. To be a life form in the virtual world, cyber characters need sensors and control systems. The sensor system enable the cyber character to recognaize not only the virtual world but also the real world in such a manner that it can respond to user's commands. The control system provides the cyber character with life-like behavior by generating goals and plans, selecting appropriate actions, and finally by animating the character. Users may feel the cyber character to be alive because of its close interaction and smart performance. In this paper, a cyber-character system designed to prove users with a realistic feeling of an artificial life is discussed.
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  • Peisuei Lee, Zenchin Chen, Lingwhen Lee
    Type: Article
    Session ID: MIP2000-13/AIT2000-1
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In the field of Computer Graphics(CG), it's necessary to plastic various character fellow a lots process by shapes, colors, pattern etc. This paper proposes an evolutionary model for automatically generating artificial creatures of various strip pattens. This model offers a novel way to naturally evolve the strip patten of artificial creatures. The evolutionary model use in this research is based on Genetic Algorithms (GA). In this paper, artificial creatures develop into various strip patterns 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 "The bug's Life". In this paper, our approach has two steps. At first, artificial creatures move according to information gathered from the five sense [1]. Then, second based on the GA, evolutionary model[2], we choose two protprype creatures, which evolve into various strip patterns in alternating generations. Finally, this evolutionary model successfully generates various characters with strip patterns automatically.
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  • Yi-Bae Choi, Ee-Taek Lee, Seung-Woo Kim
    Type: Article
    Session ID: MIP2000-14/AIT2000-1
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    A two-frequency phase-shifting projection moire method particularly intended for high-speed three-dimensional shape reconstruction of diffuse objects is presented. Emphasis is on realization of phase-shifting fringe analysis in projection moire topography using a set of line grating pairs designed to provide different phase shifts in sequence. Adopting phase-shifting technique in moire topography provides many advantages in measuring complex surface profiles with varying reflectance. However, still the so called 2π-ambiguity problem remains, which limits the maximum measurable step height difference between two neighboring sample points to be less than half the equivalent wavelength of moire fringes. To cope with the problem in this investigation, a two-wavelength scheme of projection moire topography is proposed along with necessary hardware design considerations. Further a time-integral fringe capturing scheme is devised to remove undesirable high frequency original grating patterns in realtime without time-consuming software image processing. Finally the performances of the proposed method are discussed with measurement results.
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  • Ken-ichi TANAKA
    Type: Article
    Session ID: MIP2000-15/AIT2000-1
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The computer-generated hologram (CGH) is made for three dimensional image reconstruction of a virtual object. The error diffusion method is used to improve the reconstructed image. The selection of diffusion coefficient exerts an influence to the picture quality of the reconstructed image. In this article, optimal diffusion coefficient is searched by genetic algorithm (GA).Diffusion coefficient searched by GA is able to decrease the mean square error of the reconstructed image by 5% compared with it searched by the stochastic method.
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  • Kazuyoshi Ebina, Susumu Takahashi, Fujio Iwata
    Type: Article
    Session ID: MIP2000-16/AIT2000-1
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    A description of Toppan's Rear Projection Screen(RPJ-Screen) used on image projection systems is presented. This screen is a transmission type screen, used for rear projection type TV, data screen panel, etc. The screen size we can mass produce is from 40 to greater than 60 inches. The fundamental structure of RPJ-Screen and the design optimization for a single lens type projection system are described. A consequnce of this concept is a rear projection screen with enhanced S/N, higher gain, among other properties.
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  • Ho-In Jeon, Sanghun Shin, Nak-Hee Jung, Jin-San Choi, Yoo-Seek Kang, S ...
    Type: Article
    Session ID: MIP2000-17/AIT2000-1
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this paper, we propose a new Super Multi-View 3-dimensional display system which can implement Focused Light Array (FLA) concept that has been implemented by Kajiki at TAO (Telecommunications Advancement Organization) in Japan. The FLA system of TAO utilized a polygon mirror for the horizontal scanning of 45 views, and a galvanometer for the vertical scanning. The problem of this system is that mechanical scanning method has been used, which consequently makes the whole system fragile to external impacts. In addition to that, it require as large imaging optics as the screen size. The proposed system alleviates these problems by utilizing the 2-dimensional vibrating scanner arrays whose curvatures are computed in such a way that the reflected beams are scanned over the screen at a constant speed, for the purpose of obtaining the uniform intensity of the image all over the screen. The 2-dimensionally vibrating scanner array avoided the use of the large imaging optics, because the multiview images are scanned and imaged directly on the screen at the uniform intensity. Morever the scanning can be done electronically using vibrating actuators. Some aspects of Flexibility for implementing the SMV 3-D display system are also presented.
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  • Type: Appendix
    Pages App1-
    Published: January 13, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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