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Image based rendering has displayed advantage in speed over traditional geometry based rendering algorithms. With the four dimensionl light field descriptions, static scene can be generated with interactive rate on ordinary computer. The limitation of the scheme is that it can only handle static scene and fixed illumination. This paper raises the idea to decompose the light field into sub-light-fields that do not change as scene changes. It expands the advantage of light field rendering to dynamic scenes where the position and orientation of objects, lights and viewpoint can be modified arbitrarily. The sub-light-fields include: ambient light field and spot light field. The latter is actually an eight-diamensional space. Because diffuse reflection is idenpendent on view direction, this paper presents a four-diamensional representation of spot light field. Considering the linearity of diffuse reflection to different spot light, the spot light fields of an object can be represented by the reflection light field to a pure-color light with unit intensity, to decrease storage and preprocessing. Owing to the coherency in thier data structures, data of the corresponding point in the ambient light field, diffuse light field and depth field are combined into a 5-dimensional vector which can be compressed efficiently with vector quantization. The algorithm given in this paper accurately computers typical characteristics of dynamic scene such as changes in surface color and shadow.
Czasopismo
Rocznik
Tom
Strony
551--563
Opis fizyczny
Bibliogr. 5 poz.
Bibliografia
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWA1-0001-0090
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