Journal article  Closed Access

RELIGHT: a compact and accurate RTI representation for the web

Ponchio F., Corsini M., Scopigno R.

Modeling and Simulation  Compression  Relightable images  RTI  Geometry and Topology  PTM  Compact representation  Graphics for the Web  Software  Computer Graphics and Computer-Aided Design 

Relightable images have been widely used as a valuable tool in Cultural Heritage (CH) artifacts, including coins, bas-reliefs, paintings, and epigraphs. Reflection Transformation Imaging (RTI), a commonly used type of relightable images, consists of a per-pixel function which encodes the reflection behavior, estimated from a set of digital photographs acquired from a fixed view. Web visualisation tools for RTI images currently require to transmit substantial quantities of data in order to achieve high fidelity renderings. We propose a web-friendly compact representation for RTI images based on a joint interpolation-compression scheme that combines a PCA-based data reduction with a Gaussian Radial Basis Function (RBF) interpolation exhibiting superior performance in terms of quality/size ratio. This approach can be adapted also to other data interpolation schemes, and it is not limited to Gaussian RBF. The rendering part is simple to implement and computationally efficient allowing real-time rendering on low-end devices.

Source: Graphical models (Print) 105 (2019). doi:10.1016/j.gmod.2019.101040

Publisher: Academic Press,, San Diego, CA , Stati Uniti d'America


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BibTeX entry
	title = {RELIGHT: a compact and accurate RTI representation for the web},
	author = {Ponchio F. and Corsini M. and Scopigno R.},
	publisher = {Academic Press,, San Diego, CA , Stati Uniti d'America},
	doi = {10.1016/j.gmod.2019.101040},
	journal = {Graphical models (Print)},
	volume = {105},
	year = {2019}