Blar i NTNU Open på forfatter "Janowski, Lucjan"
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Behavior as a Function of Video Quality in an Ecologically Valid Experiment
Wanat, Dominika; Janowski, Lucjan; de Moor, Katrien Rachel W (Chapter, 2023)Most user studies in the QoE multimedia domain are done by asking users about quality. This approach has advantages: it obtains many answers and reduces variance by repeated measurements. However, the results obtained in ... -
Long-Term Video QoE Assessment Studies: A Systematic Review
Cieplínska, Natalia; Janowski, Lucjan; De Moor, Katrien; Wierzchoń, Michał (Peer reviewed; Journal article, 2023)Although longitudinal studies are common in other disciplines, such as psychology, medicine, or User Experience, they are rarely used in Quality of Experience (QoE). However, observing users over time can provide useful ... -
Quality Assessment of Video Services in the Long Term
Cieplínska, Natalia; Janowski, Lucjan; de Moor, Katrien Rachel W (Chapter, 2023)In traditional subjective video quality experiments, the presented sequences are short and quality ratings are based on a single interaction with a service (i.e., one session). However, in real-life scenarios, users interact ... -
The Role of Theoretical Models in Ecologically Valid Studies: the example of a video Quality of Experience model
Koniuch, Kamil; Janowski, Lucjan; de Moor, Katrien Rachel W; Wierzchon, Michal; Subramanian, Sruti (Peer reviewed; Journal article, 2023)This paper discusses the problem of ecological va-lidity of Quality of Experience experiments in a broader context of internal and external validity. We argue that the issue of trade-off between control in the experiment ... -
Top-down and bottom-up approaches to video quality of experience studies; overview and proposal of a new model
Koniuch, Kamil; barakovic, Sabina; Baraković Husić, Jasmina; Subramanian, Sruti; De Moor, Katrien Rachel W; Janowski, Lucjan; Wierzchoń, Michał (Journal article; Peer reviewed, 2024)Modern video streaming services require quality assurance of the presented audiovisual material. Quality assurance mechanisms allow streaming platforms to provide quality levels that are considered sufficient to yield user ... -
Towards enhancing ecological validity in user studies: a systematic review of guidelines and implications for QoE research
Subramanian, Sruti; de Moor, Katrien Rachel W; Fiedler, Markus; Koniuch, Kamil; Janowski, Lucjan (Peer reviewed; Journal article, 2023)The concept of conducting ecologically valid user studies is gaining traction in the field of Quality of Experience (QoE). However, despite previous research exploring this concept, the increasing volume of studies has ...