適用於可見光環境之高速眼動儀系統設計

Abstract

多數的眼球追蹤系統依靠較強的紅外光(IR)增強亮度，以達到不錯的準確度，但對使用者來說會略感不適。在本篇論文中，我們提出一可運行於一般光源的高速眼動儀系統，能夠克服光源不足以及當取樣率提升，所導致的光源閃爍問題。 本論文提出的系統包含四大部分，如何在影像中決定適當的搜尋範圍，如何透過特徵辨識找出受試者可能注視的方向，如何在搜尋範圍內找出合適的特徵並決定凝視點，最後計算如何由影像中的凝視點映射到螢幕上的凝視點，以及本文所提出的系統準確度計算。在240 fps的取樣率下，能夠達到水平方向0.76度與垂直方向1.43度的準確度。Most gaze tacking system relies on strong IR light to enhance illumination and fulfill high accurate rate, thus this results in poor user experience. In this thesis, we present a high speed gaze tracking system which is operated in a normal lighting condition and overcome the insufficient of lightness and flicker coursed by high speed capture rate. The proposed system contains four parts: how to decide the search space in image, how to roughly get the gaze direction by pattern recognition technique, how to extract useful features under known search space, how to calculate the mapping function from image coordinate to screen coordinate and finally, how to get the accurate rate of this system. Under 240 frames/s sample rate, this system can achieve the accuracy of 0.76 degree and 1.43 degree for the horizontal and vertical coordinates of the detected gaze center, respectively.