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Proceedings Paper

Bit-rate prediction for look-ahead coding with AVC
Author(s): Markus Beermann
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Paper Abstract

Compression of digitized video highly depends on, and varies with, the signal to be compressed. The relation of quantizer, distortion and rate needs to be modeled when control in a system involving video compression is asked for. An experimental analysis of the optimized video codec AVC of ITU-T and MPEG shows that its rate behavior can be modeled accurately enough to predict bit-rate on macroblock-level. Given information of allocated rates from a pre-encoding analysis step, the bit-rate profile at any different quantizer setting for the video can be predicted. Experiments, comparing predicted rate against actual encoding rate show good performance of the model.These reflect the performance of the model in rate-control schemes. A simple example pre-analysis rate-control based on the model will determine beforehand a possible rate-profile that the actual encoding should be able to follow with small quality variations. For a signal of varying complexity, a varying number of bits will be used to obtain constant quality. Such variations are limited by peak bit-rates and buffer-sizes that are defined by hypothetical reference decoders in AVC.

Paper Details

Date Published: 18 January 2004
PDF: 10 pages
Proc. SPIE 5308, Visual Communications and Image Processing 2004, (18 January 2004); doi: 10.1117/12.527129
Show Author Affiliations
Markus Beermann, RWTH-Aachen (Germany)

Published in SPIE Proceedings Vol. 5308:
Visual Communications and Image Processing 2004
Sethuraman Panchanathan; Bhaskaran Vasudev, Editor(s)

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