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  • 1.
    Andersson, Kenneth
    et al.
    Linköping University, Department of Biomedical Engineering, Medical Informatics. Linköping University, The Institute of Technology.
    Johansson, Peter
    Linköping University, Department of Electrical Engineering, Image Coding. Linköping University, The Institute of Technology.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering, Image Coding. Linköping University, The Institute of Technology.
    Knutsson, Hans
    Linköping University, Department of Biomedical Engineering, Medical Informatics. Linköping University, The Institute of Technology. Linköping University, Center for Medical Image Science and Visualization (CMIV).
    Backward-forward motion compensated prediction2002In: Proceedings of ACIVS 2002 (Advanced Concepts for Intelligent Vision Systems), Ghent, Belgium, September 9-11, 2002, 2002, p. 260-267Conference paper (Refereed)
    Abstract [en]

    This paper presents new methods for use of dense motion fields for motion compensation of interlaced video. The motion is estimated using previously decoded field-images. An initial motion compensated prediction is produced using the assumption that the motion is predictable in time. The motion estimation algorithm is phase-based and uses two or three field-images to achieve motion estimates with sub-pixel accuracy. To handle non-constant motion and the specific characteristics of the field-image to be coded, the initially predicted image is refined using forward motion compensation, based on block-matching. Tests show that this approach achieves higher PSNR than forward block-based motion estimation, when coding the residual with the same coder. The subjective performance is also better.

  • 2.
    Johansson, Peter
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Electrical Engineering, Image Coding.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering.
    Source Coding Rate Control for Gilbert-Elliott Channel2005In: RVK 05,2005, Linköping: FOI , 2005, p. 543-Conference paper (Refereed)
    Abstract [en]

    We consider the problem of choosing the rate for a source coder when transmitting lossy-compressed data in real-time over a channel with time-varying rate. The goal for the rate selection is to obtain a low average distortion while obeying a real-time constraint. We formulate the real-time constraint in terms of a limited buffer size. A few strategies for rate-control are suggested and evaluated for a Gilbert-Elliott type channel model. The results are also compared to a theoretical upper bound on performance for a rate-control algorithm working with constraints on buffer size.

  • 3.
    Löfvenberg, Jacob
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Electrical Engineering, Information Theory.
    Johansson, Peter
    Linköping University, The Institute of Technology. Linköping University, Department of Electrical Engineering, Image Coding.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering.
    A Model for Mobility-Based Communication in Ad Hoc Networks2005In: The Third Swedish National Computer Networking Workshop,2005, 2005Conference paper (Other academic)
    Abstract [en]

    We introduce the concept of mobility-based communication in ad hoc networks, meaning that the packet transport is performed mainly by the nodes' movement. We outline a model for such networks, utilizing a stochastic model for the geographical location of the nodes. A test case is defined in which three strategies for packet forwarding are presented and evaluated.

  • 4.
    Muhammad, Ajmal
    et al.
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.
    Johansson, Peter
    Linköping University, Department of Electrical Engineering, Computer Vision. Linköping University, The Institute of Technology.
    Forchheimer, Robert
    Linköping University, Department of Electrical Engineering. Linköping University, The Institute of Technology.
    Effect of Buffer Placement on Performance When Communicating Over a Rate-Variable Channel2009In: / [ed] Eugen Borcoci, Michel Diaz, Cosmin Dini, Reijo Savola, IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA , 2009, p. 125-130Conference paper (Refereed)
    Abstract [en]

    We compare the performance of two real-time multimedia communication systems for quality versus end-to-end delay. We develop an analytical framework for comparison when the systems use a deterministic time-varying channel. Moreover, we assess their performance for the Gilbert-Elliott channel model which alternates between a good and a bad state with time durations that are exponentially distributed. The goal of the paper is to select the best system with low average distortion while obeying a real-time constraint.

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