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• W2162094431 abstract "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." @default.
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• W2162094431 date "1989-09-01" @default.
• W2162094431 modified "2023-09-28" @default.
• W2162094431 title "64 kbit/s video coding equipment using adaptive tree-search vector quantization" @default.
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• W2162094431 doi "https://doi.org/10.1002/ecja.4410720904" @default.
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