A new Hybrid Coding Technique for Videoconference Applications at 2 Mbit/s

Herbert Holzlwimmer; Walter Tengler; Achim V. Brandt

doi:10.1117/12.952220

1 May 1986 A new Hybrid Coding Technique for Videoconference Applications at 2 Mbit/s

Herbert Holzlwimmer, Walter Tengler, Achim V. Brandt

Proceedings Volume 0594, Image Coding; (1986) https://doi.org/10.1117/12.952220
Event: 1985 International Technical Symposium/Europe, 1985, Cannes, France

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.

Citation Download Citation

Herbert Holzlwimmer, Walter Tengler, and Achim V. Brandt "A new Hybrid Coding Technique for Videoconference Applications at 2 Mbit/s", Proc. SPIE 0594, Image Coding, (1 May 1986); https://doi.org/10.1117/12.952220

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