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Proceedings Paper

Nonstationary parametric models of a VBR coder for packet video on ATM networks
Author(s): Alessandro Andreadis; Giuliano Benelli; Andrea Garzelli
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Paper Abstract

In this paper a class of parametric models is proposed to describe the output bit-rate from a motion-compensated two- layer video coder. No frame buffering is considered and the amounts of bits generated are regarded slice by slice (1 slice equals 16 consecutive frame lines), thus resulting in a repetitive behavior of the bit rate time series. After removing the nonstationary mean components of each frame, traditionally modeled as Auto Regressive (AR), the resulting cyclo-stationary process is spectrally analyzed and the periodical mean is estimated and subtracted. A simplified seasonal AR model is tailored to the residuals, still affected by little periodicity. Correlation between the low resolution channel and the detail channel, together making up the full resolution channel, is accounted by the overall model, whose fitness is assessed from true bit rate data from a two-layer subband+discrete cosine transform (SB+DCT) video coder. Simple procedures to derive likely values of the parameters ruling the model are proposed as well. Synthetic realizations of bit rate time series are produced and discussed.

Paper Details

Date Published: 10 October 1997
PDF: 12 pages
Proc. SPIE 3231, Performance and Control of Network Systems, (10 October 1997); doi: 10.1117/12.290440
Show Author Affiliations
Alessandro Andreadis, Univ. di Siena (Italy)
Giuliano Benelli, Univ. di Siena (Italy)
Andrea Garzelli, Univ. di Siena (Italy)


Published in SPIE Proceedings Vol. 3231:
Performance and Control of Network Systems
Wai Sum Lai; Hisashi Kobayashi, Editor(s)

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