Wide Gamut Spectral Upsampling with Fluorescence

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dc.contributor.authorJung, Alisaen_US
dc.contributor.authorWilkie, Alexanderen_US
dc.contributor.authorHanika, Johannesen_US
dc.contributor.authorJakob, Wenzelen_US
dc.contributor.authorDachsbacher, Carstenen_US
dc.contributor.editorBoubekeur, Tamy and Sen, Pradeepen_US
dc.date.accessioned2019-07-14T19:24:21Z
dc.date.available2019-07-14T19:24:21Z
dc.date.issued2019
dc.description.abstractPhysically based spectral rendering has become increasingly important in recent years. However, asset textures in such systems are usually still drawn or acquired as RGB tristimulus values. While a number of RGB to spectrum upsampling techniques are available, none of them support upsampling of all colours in the full spectral locus, as it is intrinsically bigger than the gamut of physically valid reflectance spectra. But with display technology moving to increasingly wider gamuts, the ability to achieve highly saturated colours becomes an increasingly important feature. Real materials usually exhibit smooth reflectance spectra, while computationally generated spectra become more blocky as they represent increasingly bright and saturated colours. In print media, plastic or textile design, fluorescent dyes are added to extend the boundaries of the gamut of reflectance spectra. We follow the same approach for rendering: we provide a method which, given an input RGB tristimulus value, automatically provides a mixture of a regular, smooth reflectance spectrum plus a fluorescent part. For highly saturated input colours, the combination yields an improved reconstruction compared to what would be possible relying on a reflectance spectrum alone. At the core of our technique is a simple parametric spectral model for reflectance, excitation, and emission that allows for compact storage and is compatible with texture mapping. The model can then be used as a fluorescent diffuse component in an existing more complex BRDF model. We also provide importance sampling routines for practical application in a path tracer.en_US
dc.description.number4
dc.description.sectionheadersSpectral Effects
dc.description.seriesinformationComputer Graphics Forum
dc.description.volume38
dc.identifier.doi10.1111/cgf.13773
dc.identifier.issn1467-8659
dc.identifier.pages87-96
dc.identifier.urihttps://doi.org/10.1111/cgf.13773
dc.identifier.urihttps://diglib.eg.org:443/handle/10.1111/cgf13773
dc.publisherThe Eurographics Association and John Wiley & Sons Ltd.en_US
dc.titleWide Gamut Spectral Upsampling with Fluorescenceen_US
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