64 Kbit/s video coding equipment using adaptive tree-search vector quantization

Hiroshi Watanabe, Ryohei Hoshino, Hideo Kuroda, Hideo Hashimoto

Research output: Contribution to journalArticle


This paper proposes a high-efficiency coding algorithm realization of a 64 kbit/s video coding equipment. An adaptive tree-search vector quantization is described 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.

Original languageEnglish
Pages (from-to)35-44
Number of pages10
JournalElectronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)
Issue number9
Publication statusPublished - 1989 Sep
Externally publishedYes


ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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