Estimation of illumination distribution using a specular sphere

Takayuki Okatani, Koichiro Deguchi

研究成果: Article査読

5 被引用数 (Scopus)


A method has been proposed for acquiring an omnidirectional image of a scene using a specular sphere (namely a mirror ball). The method takes the reflected image on the specular sphere located at a desired position in a scene by an ordinary camera. This paper discusses the relation between the reflected image of the scene and the radiance of the scene. Because of the reflection on the sphere, the final image on the camera has geometric distortion. There are imaging systems covering wide angle by a lens system itself, e.g., a fish-eye lens. The image obtained by such lens systems has similar geometrical distortion. The effect of the distortion on the image brightness is different however. We point out that the image distortion due to the lens system affects the image brightness, while that due to the reflection on the specular sphere does not. Most of the discussion can be applied to the methods using a curved mirror to obtain a wide angle image.

ジャーナルProceedings - International Conference on Pattern Recognition
出版ステータスPublished - 2000 12月 1

ASJC Scopus subject areas

  • コンピュータ ビジョンおよびパターン認識


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