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Proceedings Paper

A new Hybrid Coding Technique for Videoconference Applications at 2 Mbit/s
Author(s): Herbert Holzlwimmer; Walter Tengler; Achim V. Brandt
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Paper Abstract

A new hybrid coding technique is introduced which is based on the Discrete Cosine Transform, interframe DPCM, conditional replenishment, detection of significant subareas in the transform domain, adaptive quantization, adaptive Huffman coding and postbuffer control. This coder concept is the result of a comparison of several coding methods including uniform/nonuniform quantization, constant/variable word length coding and prebuffer/post-buffer control schemes. An important feature of the presented coder is the selection of transform coefficients within each block which are grouped in subareas for adaptive entropy coding. The components of the coder are described and its excellent performance is demonstrated by means of SNR-measurements and a typical videoconference sequence.

Paper Details

Date Published: 1 May 1986
PDF: 10 pages
Proc. SPIE 0594, Image Coding, (1 May 1986); doi: 10.1117/12.952220
Show Author Affiliations
Herbert Holzlwimmer, Siemens AG (Federal Republic of Germany)
Walter Tengler, Siemens AG (Federal Republic of Germany)
Achim V. Brandt, Siemens AG (Federal Republic of Germany)

Published in SPIE Proceedings Vol. 0594:
Image Coding
Thomas S. Huang; Murat Kunt, Editor(s)

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