An Evaluation of Perceptual Experience of Skiers Using Quantitative Image Processing

    Volume 5, Issue 4 (April 2008)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 8 April 2008

    Page Count: 6


    Krauss, David A.
    Exponent Failure Analysis Associates, Los Angeles, CA

    Lieberman, Daniel H.
    Exponent Failure Analysis Associates, Los Angeles, CA

    Grossman, Helene
    Exponent Failure Analysis Associates, Los Angeles, CA

    Ray, Rose
    Exponent Failure Analysis Associates, Los Angeles, CA

    Scher, Irving
    Exponent Failure Analysis Associates, Los Angeles, CA

    Department of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA

    (Received 16 August 2007; accepted 15 March 2008)

    Abstract

    We applied the principles of visual perception, light, and optics to quantify the influence of ambient sunlight on the ability of skiers and snowboarders to perceive ground contours on a ski slope. To this end, we systematically measured the visibility of the terrain on ski runs under a variety of lighting conditions at Mammoth Mountain in California. Recreational skiers, snowboarders, and ski patrol members were surveyed to determine their subjective ratings of visibility. These subjective visibility ratings for various weather/lighting conditions were compared to quantified on-slope visibility measurements that were obtained using quantitative contrast and luminance measurements. The preliminary results support the objective measure as a tool to objectively quantify on-slope visibility and suggest additional cues skiers/snowboarders may be using to assess visibility. The methodology presented in this paper provides a first step in using software-based image analysis as a tool to predict conditions under which the likelihood of injuries may increase. Ultimately, resorts could use these data to develop methods of enhancing visibility on poorly lit runs before injuries occur.


    Paper ID: JAI101405

    DOI: 10.1520/JAI101405

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    Author
    Title An Evaluation of Perceptual Experience of Skiers Using Quantitative Image Processing
    Symposium , 0000-00-00
    Committee F27