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Proceedings Paper

An Adaptive Classification Procedure For Transform Coding Of Image Sequences
Author(s): Herbert Holzlwimmer; Bernard Hammer
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Paper Abstract

A classification method for adaptive scalar quantization and efficient encoding of the DCT coefficients of video phone signals is described. In a corresponding coder concept using hybrid vector and scalar quantization the vector quantization (VQ) stage is not only used as an efficient prequantization method but also as a classifier for zonal coding by the following adaptive scalar quantization and encoding stage. To optimize the coder per-formance, the VQ classification result is combined with the output of an energy-based classifier. Our simulation results indicate that in 61 kbit/s encoding applications this concept improves the signal-to-noise-ratio by up to 0.8 dB with regard to a pure energy-based classification method.

Paper Details

Date Published: 14 October 1987
PDF: 8 pages
Proc. SPIE 0804, Advances in Image Processing, (14 October 1987);
Show Author Affiliations
Herbert Holzlwimmer, Siemens AG (West Germany)
Bernard Hammer, Siemens AG (West Germany)

Published in SPIE Proceedings Vol. 0804:
Advances in Image Processing
Andre J. Oosterlinck; Andrew G. Tescher, Editor(s)

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