赤外線CCDカメラを用いた眼球運動の定量的解析 : その解析アルゴリズム A New Algorithm for Quantitative Analysis of Eye Movements Recorded with an Infrared CCD Camera

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We report a new algorithm that allows quantitative analysis of eye movements recorded with an infrared CCD camera, now widely used to examine nystagmus. With this camera, it is possible to observe minute eye movements and the recorded eye movements can also be replicated.<BR>We first divide a segment of a film of eye movements into frames and then subdivided the area of each frame into multiple blocks. A pattern-matching method is used to determine the direction and distance (i.e., vector) of the movement of the pixels in each block. The axis and angle of rotation of the eyeball are then calculated based on the derived vectors.<BR>Our algorithm has several advantages. It does not assume that the eyeball rotates around the center of the pupil, but calculates the axis of rotation. Accordingly, complicated eye movements can be analyzed, e.g., those in which the axis of cyclorotation does not cross the center of the pupil. It also minimizes the effects of noise caused by the eyelids, because multiple vectors are used to determine the eye movements. Therefore, it facilitates analysis of eye movements in patients with narrow palpebral fissures. It also eliminates the effects of infrared ray reflex on the bulbar conjunctiva.

収録刊行物

  • Equilibrium research

    Equilibrium research 57(5), 510-514, 1998-10-01

    Japan Society for Equilibrium Research

参考文献:  7件中 1-7件 を表示

被引用文献:  6件中 1-6件 を表示

各種コード

  • NII論文ID(NAID)
    10008711533
  • NII書誌ID(NCID)
    AN00001485
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03855716
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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