UHD 영상은 기존 HD 영상 신호보다 훨씬 다양한 색을 표현할 수 있다는 장점이 있다. 넓은 색역을 효율적으로 사용할 수 있게 하기 위해서는 UHD 영상 시스템을 위한 고실감 색표현 기술 개발이 필요하다. 본 고에서는 우선 사람이 보는 색을 표현하는 표준인 CIE 색표계 (CIE Colorimetry)에 대해 소개하고, CIE 색표계를 이용하여 기존 방송 표준 신호 색표현 방법의 문제를 분석한 후, 이를 바탕으로 UHD 신호를 위한 고실감 색표현 기술 개발 방향을 제안하고자 한다.
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