증강현실에서의 반사구를 활용한 사실적조명 생성
Regeneration of Plausible Lighting using a Specular Sphere in Augmented Reality
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초록
본 논문에서는 마커리스 증강현실 가시화에서 반사구(mirror-sphere)를 이용하여 실제 환경의 광원위치를 추정한 결과를증강되는가상객체에적용하는방법을제안한다.고정된환경조명의안정적인추정을위해,카메라를반사구주위를돌며촬영하여반사구에대한다중영상을획득한후,각광원벡터클러스터의주광원방향을추정한다.본논문에서는환경조명의 광원방향 추정과 함께 움직이는 광원에 대한 광원방향도 추정함으로써, 실제 조명환경을 증강되는 가상객체에 반영하여 사실적인음영효과와 그림자를 생성한다. 본 논문에서 제안하는 조명 추정 방법은 조명 환경에 대한어떠한 사전정보 없이도 즉각적으로 증강현실 가시화에 적용할 수 있다.
Abstract
This paper presents a practical method to estimate the directions of light sources in real environment, using a mirror sphere placed on a set of known natural features in augmented reality. For the stable result of static lighting, we take the multiple images around the sphere and estimate the principal light directions of the vector clusters for each light source in realtime. We also estimate the moving illuminant for changes of the scene illumination, and augment the virtual objects onto the real image with the proper highlighting and shadows. The proposed method of this paper can be applied to augmented reality visualization without any previous information respecting the environmental illuminations.
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