Imperial College London
Alternate

ProfessorAbhijeetGhosh

Faculty of Engineering, Department of Computing

Professor of Graphics and Imaging
 
 
 
//

Contact

 

+44 (0)20 7594 8351abhijeet.ghosh Website

 
 
//

Location

 

376Huxley BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Rainer:2020:10.1111/cgf.13921,
author = {Rainer, G and Ghosh, A and Jakob, W and Weyrich, T},
doi = {10.1111/cgf.13921},
journal = {Computer Graphics Forum: the international journal of the Eurographics Association},
pages = {167--178},
title = {Unified neural encoding of BTFs},
url = {http://dx.doi.org/10.1111/cgf.13921},
volume = {39},
year = {2020}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Realistic rendering using discrete reflectance measurements is challenging, because arbitrary directions on the light and viewhemispheres are queried at render time, incurring large memory requirements and the need for interpolation. This explains thedesire for compact and continuously parametrized models akin to analytic BRDFs; however, fitting BRDF parameters to complexdata such as BTF texels can prove challenging, as models tend to describe restricted function spaces that cannot encompassreal-world behavior. Recent advances in this area have increasingly relied on neural representations that are trained to reproduceacquired reflectance data. The associated training process is extremely costly and must typically be repeated for each material.Inspired by autoencoders, we propose a unified network architecture that is trained on a variety of materials, and which projectsreflectance measurements to a shared latent parameter space. Similarly to SVBRDF fitting, real-world materials are representedby parameter maps, and the decoder network is analog to the analytic BRDF expression (also parametrized on light and viewdirections for practical rendering application). With this approach, encoding and decoding materials becomes a simple matter ofevaluating the network. We train and validate on BTF datasets of the University of Bonn, but there are no prerequisites on eitherthe number of angular reflectance samples, or the sample positions. Additionally, we show that the latent space is well-behavedand can be sampled from, for applications such as mipmapping and texture synthesis.
AU  - Rainer,G
AU  - Ghosh,A
AU  - Jakob,W
AU  - Weyrich,T
DO  - 10.1111/cgf.13921
EP  - 178
PY  - 2020///
SN  - 0167-7055
SP  - 167
TI  - Unified neural encoding of BTFs
T2  - Computer Graphics Forum: the international journal of the Eurographics Association
UR  - http://dx.doi.org/10.1111/cgf.13921
UR  - http://reality.cs.ucl.ac.uk/projects/btf/rainer2020unified.html
UR  - https://onlinelibrary.wiley.com/doi/full/10.1111/cgf.13921
UR  - http://hdl.handle.net/10044/1/79317
VL  - 39
ER  -
Download