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Annales Des Télécommunications

, Volume 50, Issue 7–8, pp 603–616 | Cite as

Rate constraints for video transmission over atm networks based on joint source/network criteria

  • Antonio Ortega
  • Mark W. Garrett
  • Martin Vetterli
Article
  • 11 Downloads

Abstract

In this paper, we study the rate constraints required for variable rate video transmission over atm networks. Our objective is to achieve both good source quality and efficient network utilization. We show that these objectives may not be achieved simultaneously unless both network and source coding considerations are taken into account. In particular, we show that, given a rate constraint, a greedy source coding strategy will reduce the potential for statistical multiplexing gain in the network. We propose two alternative methods to achieve our goals. The first method requires non-greedy source coding techniques, implementable through rate control, such that video encoders will only use the bit rate needed to achieve a certain, nearly constant quality level. As a consequence, low activity scenes will use a fraction of the maximum allowable bit rate. The second method calls for increasing the number of rate constraints imposed on each connection so that the amount of bandwidth used in the worst case (it by greedy coders) is limited. Experimental results for a medium length (5 min) video sequence are given.

Key words

atm Videocommunication service Traffic control Variable bit rate Quality of service Statistical multiplexing Picture coding 

Contraintes sur le Débit Prenant en Compte à la Fois des Critères de Source et de Réseau Pour une Transmission Vidéo sur Réseau ATM

Résumé

Dans cet article les contraintes devant être imposées sur le débit de transmissions vidéo sur réseaux atm sont étudiées. Ľ objectif est ďobtenir une bonne qualité pour la source, ainsi qu’une utilisation efficace du réseau. Ces deux objectifs ne peuvent pas être atteints si les critères de source et de réseau ne sont pas pris en compte simultanément. En particulier, un codage de source glouton réduit le potentiel pour le gain de multiplexage statistique. Deux methodes pour atteindre ce but sont proposées. Une première methodefait appel à un codage de source non glouton, tel que ľ objectif du codeur vidéo est de maintenir une qualite constante. Dans ce cas, les scènes contenant peu ďactivité utiliseront un nombre de bits réduit. La deuxième méthode consiste à augmenter le nombre de contraintes imposées sur le débit vidéo de façon à limiter le nombre de bits utilisés dans le pire cas (c’ est-à-dire dans le cas du codeur glouton). Des résultats expérimentaux pour une séquence vidéo de durée moyenne (5 min) sont présentés.

Mots clés

Multiplexage temporel asynchrone Service vidéocommunication Maîtrise trafic Débit transmission variable Qualité service Multiplexage statistique Codage image 

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • Antonio Ortega
    • 1
  • Mark W. Garrett
    • 1
  • Martin Vetterli
    • 1
  1. 1.Dept. of Electrical Engineering Signal and Image Processing InstituteUniversity of Southern California 3740 McClintock AvenueUSA.

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