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2005 Fiscal Year Final Research Report Summary

Acquisition and Coding of Light-Ray Data for 3D Spatial Communication

Research Project

Project/Area Number 14205059
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 情報通信工学
Research InstitutionThe University of Tokyo

Principal Investigator

HARASHIMA Hiroshi  The University of Tokyo, Interfaculty Initiative for Information Studies, Professor, 大学院・情報学環, 教授 (60011201)

Co-Investigator(Kenkyū-buntansha) AIZAWA Kiyoharu  The University of Tokyo, Graduate School of Frontier Sciences, Dept. of Frontier Informatics, Professor, 大学院・新領域創成科学研究科, 教授 (20192453)
NAEMURA Takeshi  The University of Tokyo, Interfaculty Initiative for Information Studies, Associate Professor, 大学院・情報学環, 助教授 (90292896)
IIDA Makoto  The University of Tokyo, Graduate School of Engineering, Dept, of Electronic Engineering, Research Assistant, 大学院・工学系研究科, 助手 (40345103)
Project Period (FY) 2002 – 2005
KeywordsLight-Ray Data / 3-D Spatial Communication / 3-D Display / Image-Based Rendering / Data Compression / Multi-View Camera
Research Abstract

Under this project, we investigated some methods for acquisition and coding of light-ray data as a set of fundamental elements for 3-D spatial communication.
1.Description method of light-ray data towards 3D spatial communication
Visual data of a 3-D space can be represented as a 4-D function called a light field or a ray space, in which the light-rays filling the 3-D space are regarded as a fundamental element. We introduced the frequency domain analysis to the ray space in order to describe the processes of acquisition of multi-view images, analysis on the light-ray data, and synthesis of free-viewpoint images. Especially, we proposed the "focus measurement method" to identify clear parts on synthesized images, which is an important contribution that relates a signal processing theory with computer vision technologies.
2.Acquisition method of light-ray data for efficient capturing of 3D spatial data
Capturing light-ray data is equivalent to sampling the ray space. In this project, we cla … More rified the relation between the sampling condition and the quality of the images synthesized from the sampled data. To pursue the ideal sampling condition, we investigated a multi-view acquisition method using an array of thousands of lenslets in cooperation with NHK Science and Technical Research Laboratories.
3.Data compression method for light-ray data for efficient transmission of 3D spatial data
For compressing the light-ray data, we should consider the adaptability to several applications as well as the exploitation of the redundancy in the data. In this project, we focused on the "locality of reference" for synthesizing free-viewpoint images, and conducted a basic study on an efficient coding scheme using this locality.
4.Prototype of 3D spatial communication based on light-ray data
Real-time processing and low-latency are the important requirements for 3D spatial communication. We proposed and implemented a real-time algorithm for synthesizing free-viewpoint images without any off-line processing, and succeeded in real time processing of dynamic scenes. Less

  • Research Products

    (16 results)

All 2006 2005 2003 Other

All Journal Article (15 results) Book (1 results)

  • [Journal Article] Focus Measurement and All in-Focus Image Synthesis for Light Field Rendering2006

    • Author(s)
      Keita Takahashi, Akira Kubota, Takeshi Naemura
    • Journal Title

      Systems and Comupters in Japan 37・1

      Pages: 1-12

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 自由視点画像合成に基づく光線空間符号化2006

    • Author(s)
      田口裕一, 苗村健
    • Journal Title

      映像情報メディア学会誌 60・4

      Pages: 569-575

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Layered Light-Field Rendering with Focus Measurement2006

    • Author(s)
      Keita Takahashi, Takeshi Naemura
    • Journal Title

      Eurasip Signal rocessing : Image Communication (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Focus Measurement and All in-Focus Image Synthesis for Light Field Rendering2006

    • Author(s)
      Keita Takahashi, Akira Kubota, Takeshi Naemura
    • Journal Title

      Systems and Computers in Japan 37-1

      Pages: 1-12

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Ray-Space Coding Based on Free-Viewpoint Image Synthesis2006

    • Author(s)
      Yuichi Taguchi, Takeshi Naemura
    • Journal Title

      The Journal of the Institute of Image Information and Television Engineers 60-4

      Pages: 569-575

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Light Field Renderingにおける合焦判定と全焦点画像合成2005

    • Author(s)
      高橋桂太, 久保田彰, 苗村健
    • Journal Title

      電子情報通信学会論文誌 J88-D-II・3

      Pages: 573-584

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Light Field Renderingのための合焦判定法の空間領域における定義と非格子カメラ群入力への適用2005

    • Author(s)
      高橋桂太, 苗村健
    • Journal Title

      映像情報メディア学会誌 59・10

      Pages: 1478-1482

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] レンズアレイを用いた実時間全焦点自由視点画像合成システム2005

    • Author(s)
      河宗玄, 小島將, 高橋桂太, 苗村健
    • Journal Title

      映像情報メディア学会誌 59・10

      Pages: 1483-1487

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Focus Measurement and All in-Focus Image Synthesis for Light Field Rendering2005

    • Author(s)
      Keita Takahashi, Akira Kubota, Takeshi Naemura
    • Journal Title

      The IEICE Trans. On Information and Systems J88-D-II-3

      Pages: 573-584

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Spatial Domain Definition of Focus Measurement Method for Light Field Rendering and Its Application for Images Captured with Unstructured Array of Cameras2005

    • Author(s)
      Keita Takahashi, Takeshi Naemura
    • Journal Title

      The Journal of the Institute of Image Information and Television Engineers 59-10

      Pages: 1478-1482

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Real-time All in-Focus Free-Viewpoint Image Synthesis System Using a Lens Array2005

    • Author(s)
      Jonghyun Ha, Masaru Kojima, Keita Takahashi, Takeshi Naemura
    • Journal Title

      The Journal of the Institute of Image Information and Television Engineers 59-10

      Pages: 1483-1487

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Human Communication Media2005

    • Author(s)
      Takeshi Naemura
    • Journal Title

      Telecommunication, Teleimmersion and Telexistence II

      Pages: 153-164

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 自由視点画像合成における光線情報のサンプリングと被写界深度に関する理論2003

    • Author(s)
      高橋桂太, 苗村健, 原島博
    • Journal Title

      映像情報メディア学会誌 57・10

      Pages: 1292-1299

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Theory on Sampling of Light-Ray Data and Depth of Field for Free-Viewpoint Image Synthesis2003

    • Author(s)
      Keita Takahashi, Takeshi Naemura, Hiroshi Harashima
    • Journal Title

      The Journal of the Institute of Image Information and Television Engineers 57-10

      Pages: 1292-1299

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Layered Light-Field Rendering with Focus Measurement

    • Author(s)
      Keita Takahashi, Takeshi Naemura
    • Journal Title

      Eurasip Signal Processing : Image Communication (accepted)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] Human Communication Media2005

    • Author(s)
      Takeshi Naemura
    • Total Pages
      7
    • Publisher
      Telecommunication, Teleimmersion and Telexistence II
    • Description
      「研究成果報告書概要(和文)」より

URL: 

Published: 2007-12-13  

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