STP1510: An Evaluation of Perceptual Experience of Skiers Using Quantitative Image Processing

    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

    University of Southern California, Los Angeles, CA

    Pages: 6    Published: Jan 2009


    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.

    Keywords:

    snow sports, visibility, contrast, safety, skiing, snowboarding, perception


    Paper ID: STP47478S

    Committee/Subcommittee: F27.85

    DOI: 10.1520/STP47478S


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