64 kbit/s video coding equipment using adaptive tree‐search vector quantization

Hiroshi Watanabe*, Ryohei Hoshino, Hideo Kuroda, Hideo Hashimoto


研究成果: Article査読


This paper proposes a high‐efficiency coding algorithm realization of a 64 kbit/s video coding equipment. A prototype equipment constructed shows a high quality performance for video conferencing and videophones. For high efficiency coding for video conferencing a coding algorithm combined with motion‐compensated interframe prediction and the orthogonal transform coding or vector quantization is usually employed. It is known theoretically that the latter has an excellent characteristic which approaches the rate‐distortion bound. However, another coding system is desired which not only has a high coding efficiency, but a small‐scale hardware and easy control of information generation. This paper proposes an adaptive tree‐search vector quantization in which the size of a code book can be varied according to the local property of an image. The improvement of the coding efficiency due to this idea is demonstrated by a computer simulation compared with a conventional system with a fixed size code book. A 64 kbit/s video‐coding system having the resolution of 384 (horizontal) × 240 (vertical) pixels per frame was constructed. Using the coding system with the proposed algorithm, a temporal resolution of 5 to 7.5 frames/s was obtained, confirming the satisfactory results for practical applications such as video conferencing and videophones.

ジャーナルElectronics and Communications in Japan (Part I: Communications)
出版ステータスPublished - 1989 9月

ASJC Scopus subject areas

  • コンピュータ ネットワークおよび通信
  • 電子工学および電気工学


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