Dynamic psychovisual bit allocation for improved quality bit rate in MPEG-2 transmission over ATM links

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Dynamic psychovisual bit allocation for improved quality bit rate in MPEG-2 transmission over ATM links

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In ATM networks, to prevent congestion, the bandwidth allocated to a video sources can be changed to optimise the overall quality of service (QOS). In this scenario it is very important to obtain the best match between video quality and available bandwidth. The authors present a new feedback/feedforward controller, for MPEG-2 coding, that dynamically tunes the quantisation parameters by analysing the image sequence from a psychovisual point of view. The system generates images with higher quality with respect to the standard Test Model 5.

Inspec keywords: quantisation (signal); video coding; multimedia communication; data compression; image sequences; asynchronous transfer mode

Other keywords: bit rate; feedback/feedforward controller; quality of service; video quality; ATM links; available bandwidth; MPEG-2 transmission; quantisation parameters; image sequence; dynamic psychovisual bit allocation

Subjects: Optical information, image and video signal processing; Communication switching; Multimedia communications; Codes

References

    1. 1)
      • ISO/IEC JTC1/SC29/WG11/93-400, Test Model Editing Committee,MPEG-2 Test Model 5, April 1993.
    2. 2)
      • A.N. Netravali , B.G. Haskell . (1988) Digital picture representation and compression.
    3. 3)
      • J.J. Bae , T. Suda . Survey of traffic control schemes and protocols in ATM networks. Proc. IEEE , 170 - 189
    4. 4)
      • D. Le Gall . MPEG: Video compression standard for multimedia application. Commun. ACM , 4 , 305 - 313
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