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  • 1. Carr-Motyckova, Lenka
    et al.
    Thakur, Aruna
    Luleå tekniska universitet.
    Encoding of video in layers based on perceptual quality of video2001In: Proceedings MIV'01, 2001, p. 162-167Conference paper (Refereed)
    Abstract [en]

    Layering techniques for video transmission are a promising way to satisfy receivers in heterogeneous environments. A number of receiver-initiated, sender-initiated, and hybrid protocols have been developed to transmit video in layers. These are supported in different ways by many CODECs. However, there is still a need to do a comparative study of various layering techniques to determine the best way. The study should include the effect of number of layers, bit rate and frame rate of each layer, available bandwidth and rate of packet drop on the perceptual quality of video. This paper examines some of these factors and describes our preliminary results.

  • 2. Carr-Motyckova, Lenka
    et al.
    Thakur, Aruna
    Luleå tekniska universitet.
    Björk, Per-Erik
    Luleå tekniska universitet.
    Feed-forward controller for layered video coding2002In: Proceedings of the IADIS International Conference WWW/Internet: ICWI 2002 / [ed] Pedro Isaias, Lisbon: IADIS Press, 2002, p. 628-631Conference paper (Refereed)
    Abstract [en]

    Layering techniques for video transmission are being actively considered as a way of satisfying receivers in a heterogeneous environment. A layering scheme based on a combination of network requirements and the perceptual quality of video is an attractive proposition. In this paper a feed-forward post-codec controller has been described that sends video sequence in an optimally layered way. For optimization the controller considers the perceptual quality of video, load on sender and load on network. For the controller the correlations have been developed experimentally and deductively.

  • 3.
    Thakur, Aruna
    et al.
    Luleå tekniska universitet.
    Carr-Motyckova, Lenka
    A dynamic controller for optimal layering of video2002In: ACM Multimedia 2002: 10th International Conference on Multimedia, Juan-les-Pins, December 1 - 6, 2002 ; proceedings, New York: ACM Digital Library, 2002, p. 641-643Conference paper (Refereed)
    Abstract [en]

    Layering techniques for video transmission are being actively considered as a way of satisfying receivers in a heterogeneous environment. A layering scheme based on a combination of network constrains and the perceptual quality of video is an attractive proposition. In this paper a feed-forward post-codec controller has been described for sending a video sequence in an optimally layered way. For optimization the controller considers the perceptual quality of video, load on sender and load on network. The correlations used for the controller have been developed experimentally and deductively. The controller so developed has been shown to enhance the perceptual quality of video at the receiver end in a heterogeneous environment.

  • 4.
    Thakur, Aruna
    et al.
    Luleå tekniska universitet.
    Carr-Motyckova, Lenka
    Performance of a dynamic controller for layered streaming of video in internet2003In: 10th International Conference on Telecommunications: ICT 2003 ; February 23 - March 1, 2003, Sofitel Coralia Maeva Beach Hotel, Tahiti, Papeete, French Polynesia ; [conference proceedings], Piscataway, NJ: IEEE Communications Society, 2003, Vol. 2, p. 1349-1355Conference paper (Refereed)
    Abstract [en]

    The layered video approach has been considered as one of the many approaches for solving the problems related to heterogeneity in the current Internet for real time applications. A number of schemes have been propounded taking into consideration only the network requirements. Another aspect is to a develop layering scheme based on a combination of network requirements and the perceptual quality of video. In this study, a post-codec controller has been described that sends the video sequence in an optimal way, taking into consideration the effect of the type of video sequence, the number of layers and distribution of frames among different layers of the perceptual quality of video, and the load on sender and bandwidth requirement. The controller has been tested in real network for two different configurations: (a) one sender and one receiver; and (b) one sender and many receivers connected in parallel. It has been observed that the quality of transmission improves by the use of the controller.

  • 5.
    Thakur, Aruna
    et al.
    Luleå tekniska universitet.
    Gao, Chaunsi
    Luleå tekniska universitet.
    Larsson, Andreas
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    The effects of frame-rate and image quality on perceived video quality in videoconferencing2001Report (Other academic)
    Abstract [en]

    This report discusses the effect of frame-rate and image quality on the perceived video quality in a specific videoconferencing application (MarratechPro). Subjects with various videoconferencing experiences took part in four experiments wherein they gave their opinions on the quality of video upon the variations in frame-rate and image quality. The results of the experiments showed that the subjects preferred high frame rate over high image quality, under the condition of limited bandwidth.

  • 6.
    Thakur, Aruna
    et al.
    Luleå tekniska universitet.
    Parnes, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Multi-layered video transmission over Internet2001In: CSEE '2001: Conference Proceedings, Luleå tekniska universitet, 2001Conference paper (Other academic)
1 - 6 of 6
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