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Suche nach „[Q.] [Huynh-Thu]“ hat 4 Publikationen gefunden
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    DigitalAngewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    M. Pinson, C. Schmidmer, L. Janowski, R. Pepion, Q. Huynh-Thu, P. Corriveau, A. Younkin, P. Le Callet, Marcus Barkowsky, W. Ingram

    Subjective and objective evaluation of an audiovisual subjective dataset for research and development

    2013 Fifth International Workshop on Quality of Multimedia Experience (QoMEX)

    2013

    Abstract anzeigen

    In 2011, the Video Quality Experts Group (VQEG) ran subjects through the same audiovisual subjective test at six different international laboratories. That small dataset is now publically available for research and development purposes.

    DigitalAngewandte Informatik

    Zeitschriftenartikel

    M. Pinson, L. Janowski, R. Pepion, Q. Huynh-Thu, C. Schmidmer, P. Corriveau, A. Younkin, P. Le Callet, Marcus Barkowsky, W. Ingram

    The Influence of Subjects and Environment on Audiovisual Subjective Tests: An International Study

    IEEE Journal of Selected Topics in Signal Processing, vol. 6, no. 6, pp. 640-651

    2012

    DOI: 10.1109/JSTSP.2012.2215306

    Abstract anzeigen

    Traditionally, audio quality and video quality are evaluated separately in subjective tests. Best practices within the quality assessment community were developed before many modern mobile audiovisual devices and services came into use, such as internet video, smart phones, tablets and connected televisions. These devices and services raise unique questions that require jointly evaluating both the audio and the video within a subjective test. However, audiovisual subjective testing is a relatively under-explored field. In this paper, we address the question of determining the most suitable way to conduct audiovisual subjective testing on a wide range of audiovisual quality. Six laboratories from four countries conducted a systematic study of audiovisual subjective testing. The stimuli and scale were held constant across experiments and labs; only the environment of the subjective test was varied. Some subjective tests were conducted in controlled environments and some in public environments (a cafeteria, patio or hallway). The audiovisual stimuli spanned a wide range of quality. Results show that these audiovisual subjective tests were highly repeatable from one laboratory and environment to the next. The number of subjects was the most important factor. Based on this experiment, 24 or more subjects are recommended for Absolute Category Rating (ACR) tests. In public environments, 35 subjects were required to obtain the same Student\textquoterights t-test sensitivity. The second most important variable was individual differences between subjects. Other environmental factors had minimal impact, such as language, country, lighting, background noise, wall color, and monitor calibration. Analyses indicate that Mean Opinion Scores (MOS) are relative rather than absolute. Our analyses show that the results of experiments done in pristine, laboratory environments are highly representative of those devices in actual use, in a typical user environment.

    DigitalAngewandte Informatik

    Zeitschriftenartikel

    Q. Huynh-Thu, Marcus Barkowsky, P. Le Callet

    The Importance of Visual Attention in Improving the 3D-TV Viewing Experience: Overview and New Perspectives

    IEEE Transactions on Broadcasting, vol. 57, no. 2, pp. 421-431

    2011

    Abstract anzeigen

    Three-dimensional video content has attracted much attention in both the cinema and television industries, because 3D is considered to be the next key feature that can significantly enhance the visual experience of viewers. However, one of the major challenges is the difficulty in providing high quality images that are comfortable to view and that also meet signal transmission requirements over a limited bandwidth for display on television screens. The different processing steps that are necessary in a 3D-TV delivery chain can all introduce artifacts that may create problems in terms of human visual perception. In this paper, we highlight the importance of considering 3D visual attention when addressing 3D human factors issues. We provide a review of the field of 3D visual attention, discuss the challenges in both the understanding and modeling of 3D visual attention, and provide guidance to researchers in this field. Finally, we identify perceptual issues generated during the various steps in a typical 3D-TV broadcasting delivery chain, review them and explain how consideration of 3D visual attention modeling can help improve the overall 3D viewing experience.

    DigitalAngewandte Informatik

    Beitrag (Sammelband oder Tagungsband)

    Q. Huynh-Thu, Marcus Barkowsky, P. Le Callet

    Video Quality Assessment: From 2D to 3D ‐ Challenges and Future Trends

    2010 IEEE International Conference on Image Processing

    2010

    Abstract anzeigen

    Three-dimensional (3D) video is gaining a strong momentum both in the cinema and broadcasting industries as it is seen as a technology that will extensively enhance the user's visual experience. One of the major concerns for the wide adoption of such technology is the ability to provide sufficient visual quality, especially if 3D video is to be transmitted over a limited bandwidth for home viewing (i.e. 3DTV). Means to measure perceptual video quality in an accurate and practical way is therefore of highest importance for content providers, service providers, and display manufacturers. This paper discusses recent advances in video quality assessment and the challenges foreseen for 3D video. Both subjective and objective aspects are examined. An outline of ongoing efforts in standards-related bodies is also provided.