使用網路攝影機即時人眼偵測與注視點分析

Abstract

數年來，眼睛偵測與注視點分析一直為學術或應用上的熱門研究主題，其原因為眼睛是人臉上最重要且顯著的部位。學術上常利用眼睛作為人臉偵測特徵，應用上則常用於影像追蹤，例如以眼睛代替滑鼠操作的眼控滑鼠、駕駛疲勞偵測或是近年熱門的裸視3D技術。 過往的方法多數利用侵入性的紅外線照射眼睛，亦或是利用昂貴的眼動儀輔助實驗，雖然可提高眼睛偵測或注視點分析辨識率，卻忽略了對人體的潛在傷害或是一般人無法輕易取得的缺點。 本論文提出一個使用低解析度的網路攝影機即時偵測眼睛與注視點分析方法，實現以低成本實驗器材達到正確偵測眼睛與注視點分析的目的，主要方法分成兩大部分，首先利用人臉偵測獲得人臉影像，利用光線濾波器過濾光線，並且結合鼻子位置實作角度權重機制，保留正確的眼睛區域，其次透過注視點校正程序，記錄使用者不同注視點位置的眼睛資訊，建構使用者當下環境的注視點模型，藉由比對模型以達到判斷注視點區塊。

Eye detection and gaze estimation play an important role in many applications, e.g., the eye-controlled mouse in the assisting system for disabled or elderly persons, eye fixation and saccade in psychological analysis, and iris recognition in the security system. However, traditional methodologies often employed intrusive infrared-based techniques or expensive eye tracker to achieve eye detection or gaze estimation, which is impractical for general applications. In this paper, we propose a real-time eye-gaze estimation system by using a general low-resolution webcam, which estimate the eye-gaze accurately without expensive and specific equipments. A hybrid model combining the position criterion and an angle-based eye detection strategy is derived to locate the eyes more accurately than conventional methods. The appearance-based features which describe the eye and the iris compactly by the Fourier Descriptor are employed in eye-gaze estimation, which is carried out by the Support Vector Machine. The proposed algorithms have low computational complexity but high performances for eye-gaze estimation. The experiment results also showthe feasibility of the proposed methodology.