Spektrální syntéza s omezujícími podmínkami
| Název práce v češtině: | Spektrální syntéza s omezujícími podmínkami |
|---|---|
| Název v anglickém jazyce: | Constrained Spectral Uplifting |
| Klíčová slova: | spectral rendering|spectral uplifting |
| Klíčová slova anglicky: | spectral rendering|spectral uplifting |
| Akademický rok vypsání: | 2019/2020 |
| Typ práce: | diplomová práce |
| Jazyk práce: | čeština |
| Ústav: | Katedra softwaru a výuky informatiky (32-KSVI) |
| Vedoucí / školitel: | prof. Dr. techn. Alexander Wilkie |
| Řešitel: | skrytý - zadáno a potvrzeno stud. odd. |
| Datum přihlášení: | 27.03.2020 |
| Datum zadání: | 27.03.2020 |
| Datum potvrzení stud. oddělením: | 29.04.2020 |
| Datum a čas obhajoby: | 29.06.2021 09:00 |
| Datum odevzdání elektronické podoby: | 20.05.2021 |
| Datum odevzdání tištěné podoby: | 21.05.2021 |
| Datum proběhlé obhajoby: | 29.06.2021 |
| Oponenti: | Mgr. Tomáš Iser, Ph.D. |
| Zásady pro vypracování |
| Spectral rendering is a technique in which light transport is simulated across a continuous range of wavelengths, as opposed to traditional (RGB) rendering, which uses tristimulus color values. Its goal is to realistically visualise natural phenomena which are impossible to simulate with a traditional renderer, such as fluorescence, interference, dispersion or metamerism.
Textures and materials of objects in a spectral renderer must be described as spectra values, usually for the visible range of 380nm - 780nm. However, many existing graphics assets are described by RGB values, which are not directly usable in spectral rendering. In addition to this, it is not conceivable that asset creation will ever move from colorspace workflows anyway: artists prefer to paint using RGB, and will not directly work with spectral measurements. Over the last few years, a process called spectral uplifting has been introduced for the purposes of RGB tristimulus to spectral domain conversion. Although reliable algorithms for spectral uplifting already exist, they do not provide the user with the ability to constrain the process so that it matches certain RGB values to measured spectra of real objects. The goal of this thesis is to extend an existing uplift technique to provide such capabilities. The process will then, upon for a given sRGB value, compute a spectrum with respect to the given constraints which ensure that all those RGB input values for which measured spectra exist yield exactly these in return - and that all other RGB input values return plausible synthetic data which smoothly interpolates the measured spectra. The resulting system provides the key benefit to users that textures for real-world assets can be painted in an RGB editor, while the spectral reflectance still corresponds to the measured behaviour for those colours that correspond to real measurements. |
| Seznam odborné literatury |
| Wenzel Jakob and Johannes Hanika
A Low-Dimensional Function Space for Efficient Spectral Upsampling Computer Graphics Forum (Proceedings of Eurographics), volume 38, number 2, year 2019 |