可用於眼鏡配戴者的視線追蹤系統

視線追蹤已經是一個受歡迎且應用十分廣泛的人機介面系統，但是目前大部分的視線追蹤系統並沒有考慮眼鏡折射的問題，本論文將現有的GFB方法加入眼鏡折射，提出了新的 GFB方法 (稱為 NGFB)。在NGFB中是使用Ray Tracing 的方法解決光線折射的問題，所以可以適用於球面與非球面透鏡。經由追蹤光線的折射，便可以精準的計算出角膜曲率中心以及視線經眼鏡折射後的方向。本論文進行幾項實驗，一、藉由模擬系統模擬球面近視眼鏡與球面遠視眼鏡在屈光度-5、-3、-1、1、3、5的情況下加入雜訊後對視線追蹤方法的影響。二、藉由模擬系統對　NGFB　方法之虛擬平面平移對視線估測結果之影響。三、藉由模擬系統對300度球面近視眼鏡旋轉與平移對於視線追蹤方法的影響。實驗結果顯示，本論文提出的NGFB方法能夠適用於眼鏡使用者之視線追蹤系統。

關鍵字

視線追蹤；幾何光學；非接觸式視線追蹤；眼鏡；鏡片反射

並列摘要

Gaze tracking has become a popular human-computer interface which is widely adopted in various applications. However, most gaze tracking methods do not consider the influences of spectacle lens refraction and, therefore, can not be applied to users wearing eyeglasses. In this thesis, a new glint-feature-based (GFB) method (NGFB hereafter) is proposed which solves the spectacle lens refraction problem in gaze tracking. In the NGFB method, the ray tracking technique is employed to tackle the spectacle lens refraction. Thus, the NGFB method is compatible with either spherical for aspheric spectacle lenses. With the aid of ray tracing, the curvature center of the cornea and the refracted line of sight can be evaluated accurately. In this thesis, four experiments are conducted to test the proposed method via computer simulations. First, robustness of the NGFB method against the image noises is tested with spectacle lenes of diopters -5, -3, -1, 1, 3, and 5, respectively. Second, the influences of the position of virtual reflection plane used in the NGFB method to gaze tracking accuracy are examined. Third, the influences of the pose error of the spectacle lens to gaze tracking accuracy are evaluated. Experimental results show that the proposed NGFB method is robust against image noises and is insensitive to the spectacle lens pose estimation error.