Reseacher

Name FUJII Tetsuro
Official Title Professor
Affiliation Faculty of Informatics, Department of Information Systems
E-mail fujii@tcu.ac.jp
Profile In 1984, I joined Nippon Telegraph and Telephone Public Corporation (now NTT), Japan. I have been engaged in research on Super High Definition image processing and its application to 4K digital cinema. In 2000, we developed 4K digital cinema transmission system, which is based on JPEG 2000 coding technology and transmits high quality 4K digital cinema over high-speed IP networks. All digital cinema data are continuously transmitted at up to 500 Mbps. This system opens the door to the next generation of cinema-class digital content distribution over optical networks.
In 2008, I left NTT, and joined Tokyo City University. My interest move to the subjective assessment of video communications. To improve the assessment, we introduce more precise measuring methods into QoE evaluation of bi-directional video communications. We developed a new real-time measuring system for subjective assessment. Precise measurement of user QoE is the main key point for developing next generation networks.
Almost all digital media is now transmitted over all IP based network and the demand for wireless is rapidly increasing. For this purpose, we evaluate the packet loss characteristics of video streaming with UDP using MMT format over wireless LAN. As a result, we clarify that RS (Reed-Solomon) error correction code provides good transmission characteristics compared to conventional Pro-MPEG. With this method, we explore the possibility of high quality video streaming, such as 4K video, over wireless LAN.
Research Field(Keyword & Summary)
  1. (1) Subjective assessment of video communications:

    To improve the assessment, we propose more precise measuring methods into QoE evaluation of bi-directional video communication. We developed a new real-time measuring system for subjective assessment. With this system, we measure the precise elapsed time to recognize the occurrence of packet loss and the QoE under specific situation of communication with transmission delay. Precise measurement of user QoE is the main key point for developing next generation networks.

  2. (2) Transport algorithm of high quality video over WiFi:

    We clarify that RS (Reed-Solomon) error correction code provides good transmission characteristics compared to conventional Pro-MPEG over wireless LAN. Using longer block size provided by GF(2^9), we can get bit error rate of 10^-4 even at 2% packet loss environment with H.264/AVC video streaming. Using this method, we explore the possibility of high quality video streaming, such as 4K video, over wireless LAN.

Representative Papers
  1. (1) Development of 4K Digital Cinema and New Media Transport Technologies, IEICE Trans. Commun., vol.J100-B, no.9, pp.638-649, September 2017
  2. (2) A Study on the Packet Loss Characteristics for Video Transmission over Wireless LAN, 2018 International Symposium on Multimedia and Communication Technology (ISMAC 2018), August 2018
  3. (3) Distributed Video Coding Using JPEG2000 Coding Scheme, IEICE Trans. Fundamentals, VOL.E90-A, NO.3, pp.581-589, March 2007
  4. (4) A Study on Non- octave Scalable Image Coding and Its Performance Evaluation for Digital Cinema Test Material, IEICE Trans. Fundamentals, VOL.E89-A, NO.9, pp.2405-2414, Sept. 2006
  5. (5) International real-time streaming of 4K digital cinema, Future Generation Computer Systems, Volume 22, Issue 8, pp.929-939, May 2006
Patent
  1. P3927443 Image Transmission system and its transmission method
Award Achievement Award of IEICE
Recruitment of research assistant(s) No
Affiliated academic society (Membership type) IEEE, IEICE(Fellow)
Education Field (Undergraduate level) Information Theory, Communications, Digital Signal Processing
Education Field (Graduate level) Information Networks

Affiliation