An Illumination-Based Model Of Stochastic Textures

Michael T. DiBrino; Ian R. Greenshields

doi:10.1117/12.949036

7 March 1989 An Illumination-Based Model Of Stochastic Textures

Michael T. DiBrino, Ian R. Greenshields

Proceedings Volume 1005, Optics, Illumination, and Image Sensing for Machine Vision III; (1989) https://doi.org/10.1117/12.949036
Event: 1988 Cambridge Symposium on Advances in Intelligent Robotics Systems, 1988, Boston, MA, United States

Abstract

It is now widely accepted that a certain class of naturally occurring textures are best modeled using the stochastic fractal methodologies proposed by Mandelbrot. Currently, most scene modeling techniques which appeal to the fractal paradigm construct their models by the successive application of perturbations to a primitive polygonally-based representation of the scene. While we concede the efficacy of this technique in rendering the model, we argue that the technique is inherently non-scale invariant, in that it requires that the perturbed model be recomputed whenever the viewpoint of the scene is altered. Rather than adopt this approach, we argue that a knowledge of the basic fractal statistics of the scene should be sufficient to construct a rendered model of the texture without requiring the intermediate computation of a perturbed polygonal structure. Our approach involves the application of fractal geometry to the illumination physics of the object; by this, we mean that a. basic (possibly polygonal) model of the object, along with its fractal statistics, will suffice to construct a rendered version of the object with a. fractal texture independent of scene viewpoint position. To accomplish this, we rely on local perturbations of illumination nornials at the time that the normal is evaluated from the basic model of the object. The extent and nature of this local perturbation is guided by both the fractal statistics of the object and the position of the scene viewpoint. Thus, we argue that the development of the stochastic texture be done in situ at the time that the illumination is developed, rather than performed as a preliminary step in the modeling of the scene. In this way, we substantially reduce the net computational complexity of the modeling process and its subsequent rendering, since the size of the ray-tree is determined by the complexity of the base object model and not the size of the perturbed and subdivided model.

Citation Download Citation

Michael T. DiBrino and Ian R. Greenshields "An Illumination-Based Model Of Stochastic Textures", Proc. SPIE 1005, Optics, Illumination, and Image Sensing for Machine Vision III, (7 March 1989); https://doi.org/10.1117/12.949036

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