摘要 : Computer augmented reality (CAR) is a rapidly emerging field whichenables users to mix real and virtual worlds. Our goal is to provideinteractive tools to perform common illumination, i.e., lightinteractions between real and virtu... 展开 Computer augmented reality (CAR) is a rapidly emerging field whichenables users to mix real and virtual worlds. Our goal is to provideinteractive tools to perform common illumination, i.e., lightinteractions between real and virtual objects, including shadows andrelighting (real and virtual light source modification). In particular,we concentrate on virtually modifying real light source intensities andinserting virtual lights and objects into a real scene; such changes canbe very useful for virtual lighting design and prototyping. To achievethis, we present a three-step method. We first reconstruct a simplifiedrepresentation of real scene geometry using semiautomatic vision-basedtechniques. With the simplified geometry, and by adapting recenthierarchical radiosity algorithms, we construct an approximation of realscene light exchanges. We next perform a preprocessing step, based onthe radiosity system, to create unoccluded illumination textures. Thesereplace the original scene textures which contained real light effectssuch as shadows from real lights. This texture is then modulated by aratio of the radiosity (which can be changed) over a display factorwhich corresponds to the radiosity for which occlusion has been ignored.Since our goal is to achieve a convincing relighting effect, rather thanan accurate solution, we present a heuristic correction process whichresults in visually plausible renderings. Finally, we perform aninteractive process to compute new illumination with modified real andvirtual light intensities 收起