시선추적은 직관적인 사용자 인터페이스일 뿐 만 아니라 사용자의 관심 대상을 파악할 수 있는 매우 중요한 수단이다. 사용자의 시선을 추적하는 방법은 크게 착용형 디바이스를 사용하는 방법과 비착용형 디바이스를 사용하는 방법으로 나눌 수 있는데, 본 논문에서는 근적외선 참조조명을 사용하는 비착용형 시선추적 방법에 대해서 기술하고, 시선을 추적하기 위해 필요한 동공 중심 검출 방법을 제안한다. 제안한 방법은 속눈썹 및 각막반사광의 영향을 적게받도록 원호 모양의 필터를 사용하여 동공 중심을 검출한다. 또한 본 논문에서는 제안한 방법을 포함한 전체적인 시선추적 시스템을 설계 및 구현하여 시선추적 정확도를 측정하고 HCI로서의 활용 가능성을 확인한다.
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