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dc.contributor.authorMueller, Geroen_US
dc.contributor.authorSarlette, Ralfen_US
dc.contributor.authorKlein, Reinharden_US
dc.date.accessioned2015-02-21T14:31:13Z
dc.date.available2015-02-21T14:31:13Z
dc.date.issued2006en_US
dc.identifier.issn1467-8659en_US
dc.identifier.urihttp://dx.doi.org/10.1111/j.1467-8659.2006.00956.xen_US
dc.description.abstractImage-based representations of an object profit from known geometry. The more accurate this geometry is known, the better corresponding pixels in the different images can be aligned, which leads to less artifacts and better compression performance. For opaque objects the per-pixel data can then be interpreted as a sampling of the BRDF at the respective surface point. In order to parameterize this sampled data a coordinate frame has to be defined. In previous work this coordinate frame was either the global frame or a local frame derived from the base geometry. Both approaches lead to misalignments between sample vectors: Features of basically very similar BRDFs will be shifted to different regions in the sample vector leading to poor compression performance. In order to improve alignment between the sampled BRDFs in image-based rendering, we propose an optimization algorithm which determines consistent coordinate frames for every sample point on the object surface. This way we efficiently align the features even of anisotropic reflection functions and reconstruct approximate local coordinate frames without performing an explicit 3D-reconstruction. The optimization is calculated efficiently by exploiting the Fourier-shift theorem for spherical harmonics. In order to deal with different materials in a scene, the technique is combined with a clustering algorithm. We demonstrate the utility of our method by applying it to BTFs and 6D surface reflectance fields.Categories and Subject Descriptors (according to ACM CCS): I.3.3 [Picture/Image Generation]: Digitizing and scanning I.3.7 [Three-Dimensional Graphics and Realism]: Color, shading, shadowing, and textureen_US
dc.publisherThe Eurographics Association and Blackwell Publishing, Incen_US
dc.titleData-driven Local Coordinate Systems for Image-Based Renderingen_US
dc.description.seriesinformationComputer Graphics Forumen_US
dc.description.volume25en_US
dc.description.number3en_US
dc.identifier.doi10.1111/j.1467-8659.2006.00956.xen_US
dc.identifier.pages369-378en_US


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