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  • 1.
    Brunnström, Kjell
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems. Mid Sweden University, Sweden.
    Dima, Elijs
    Mid Sweden University, Sweden.
    Qureshi, Tahir
    HIAB AB, Sweden.
    Johanson, Mathias
    Alkit Communications AB, Sweden.
    Andersson, Mattias
    Mid Sweden University, Sweden.
    Sjöström, Mårten
    Mid Sweden University, Sweden.
    Latency impact on Quality of Experience in a virtual reality simulator for remote control of machines2020In: Signal processing. Image communication, ISSN 0923-5965, E-ISSN 1879-2677, Vol. 89, article id 116005Article in journal (Refereed)
    Abstract [en]

    In this article, we have investigated a VR simulator of a forestry crane used for loading logs onto a truck. We have mainly studied the Quality of Experience (QoE) aspects that may be relevant for task completion, and whether there are any discomfort related symptoms experienced during the task execution. QoE experiments were designed to capture the general subjective experience of using the simulator, and to study task performance. The focus was to study the effects of latency on the subjective experience, with regards to delays in the crane control interface. Subjective studies were performed with controlled delays added to the display update and hand controller (joystick) signals. The added delays ranged from 0 to 30 ms for the display update, and from 0 to 800 ms for the hand controller. We found a strong effect on latency in the display update and a significant negative effect for 800 ms added delay on latency in the hand controller (in total approx. 880 ms latency including the system delay). The Simulator Sickness Questionnaire (SSQ) gave significantly higher scores after the experiment compared to before the experiment, but a majority of the participants reported experiencing only minor symptoms. Some test subjects ceased the test before finishing due to their symptoms, particularly due to the added latency in the display update.

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  • 2.
    Tavakoli, Samira
    et al.
    Technical University of Madrid, Spain.
    Brunnström, Kjell
    RISE, Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Gutierrez, Jesús
    Technical University of Madrid, Spain.
    Garcia, Narciso
    Technical University of Madrid, Spain.
    Quality of Experience of Adaptive Video Streaming: Investigation in Service Parameters and Subjective Quality Assessment Methodology2015In: Signal processing. Image communication, ISSN 0923-5965, E-ISSN 1879-2677, Vol. 39, no B, p. 432-443Article in journal (Refereed)
    Abstract [en]

    The usage of HTTP adaptive streaming (HAS) has become widely spread in multimedia services. Because it allows the service providers to improve the network resource utilization user's Quality of Experience (QoE). Using this technology, the video playback interruption is reduced since the network server status in addition to capability of user device, all are taken into account by HAS client to adapt the quality to the current condition. Adaptation can be done using different strategies. In order to provide optimal QoE, the perceptual impact of adaptation strategies from point of view of the user should be studied. However, the time-varying video quality due to the adaptation which usually takes place in a long interval introduces a new type of impairment making the subjective evaluation of adaptive streaming system challenging. The contribution of this paper is two-fold: first, it investigates the testing methodology to evaluate HAS QoE by comparing the subjective experimental outcomes obtained from ACR standardized method a semi-continuous method developed to evaluate the long sequences. In addition, influence of using audiovisual stimuli to evaluate the video-related impairment is inquired. Second, impact of some of the adaptation technical factors including the quality switching amplitude chunk size in combination with high range of commercial content type is investigated. The results of this study provide a good insight toward achieving appropriate testing method to evaluate HAS QoE, in addition to designing switching strategies with optimal visual quality.

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    fulltext
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