A new algorithm for reducing the requantization loss in video transcoding

Conference contribution
(Conference Contribution)


Publication Details

Author(s): Bialkowski J, Barkowsky M, Kaup A
Publication year: 2006
ISSN: 22195491
Language: English


Abstract


Video transcoders are devices that convert one video bitstream into another type of bitstream, either with or without standard format conversion. One step to be applied in video transcoders is the requantization of the transform coefficients, if an adaptation to a lower data rate is necessary. During this step, the quality is in most cases degraded compared to a single quantization. This is a consequence of non-overlapping quantization characteristics of the input and the output quantizer. In this work we propose a new choice of the reconstruction level for the requantization step depending on the effective quantization curve of both quantization parameters involved. The reconstruction level is calculated such that it is centered in each effective quantization interval after requantization. Compared to the standard midpoint requantization this leads to quality gains of 3 dB PSNR for most pairs of input and output quantization parameters (QP). The algorithm is useful for intra-and inter-frame coding.


FAU Authors / FAU Editors

Kaup, André Prof. Dr.-Ing.
Lehrstuhl für Multimediakommunikation und Signalverarbeitung


How to cite

APA:
Bialkowski, J., Barkowsky, M., & Kaup, A. (2006). A new algorithm for reducing the requantization loss in video transcoding. In Proceedings of the 14th European Signal Processing Conference, EUSIPCO 2006. Florence, IT.

MLA:
Bialkowski, Jens, Marcus Barkowsky, and André Kaup. "A new algorithm for reducing the requantization loss in video transcoding." Proceedings of the 14th European Signal Processing Conference, EUSIPCO 2006, Florence 2006.

BibTeX: 

Last updated on 2019-29-05 at 18:23