Interactions of visual attention and quality perception

J.A. Redi, H. Liu, R. Zunino, I.E.J. Heynderickx

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    Several attempts to integrate visual saliency information in quality metrics are described in literature, albeit with contradictory results. The way saliency is integrated in quality metrics should reflect the mechanisms underlying the interaction between image quality assessment and visual attention. This interaction is actually two-fold: (1) image distortions can attract attention away from the Natural Scene Saliency (NSS), and (2) the quality assessment task in itself can affect the way people look at an image. A subjective study was performed to analyze the deviation in attention from NSS as a consequence of being asked to assess the quality of distorted images, and, in particular, whether, and if so how, this deviation depended on the distortion kind and/or amount. Saliency maps were derived from eye-tracking data obtained during scoring distorted images, and they were compared to the corresponding NSS, derived from eye-tracking data obtained during freely looking at high quality images. The study revealed some structural differences between the NSS maps and the ones obtained during quality assessment of the distorted images. These differences were related to the quality level of the images; the lower the quality, the higher the deviation from the NSS was. The main change was identified as a shrinking of the region of interest, being most evident at low quality. No evident role for the kind of distortion in the change in saliency was found. Especially at low quality, the quality assessment task seemed to prevail on the natural attention, forcing it to deviate in order to better evaluate the impact of artifacts. © 2011 Copyright SPIE - The International Society for Optical Engineering.
    Original languageEnglish
    Title of host publicationHuman Vision and Electronic Imaging XVI, 24-27 January 2011, San Francisco
    EditorsB.E. Rogowitz, T.N. Pappas
    Place of PublicationSan Francisco, CA
    ISBN (Print)9780819484024
    Publication statusPublished - 2011
    Eventconference; Human Vision and Electronic Imaging XVI; 2011-01-24; 2011-01-27 -
    Duration: 24 Jan 201127 Jan 2011

    Publication series

    NameProceedings of SPIE
    ISSN (Print)0277-786X


    Conferenceconference; Human Vision and Electronic Imaging XVI; 2011-01-24; 2011-01-27
    OtherHuman Vision and Electronic Imaging XVI


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