Title
Robust Fitting on Poorly Sampled Data for Surface Light Field Rendering and Image Relighting
Abstract
Two-dimensional 2D parametric colour functions are widely used in Image-Based Rendering and Image Relighting. They make it possible to express the colour of a point depending on a continuous directional parameter: the viewing or the incident light direction. Producing such functions from acquired data is promising but difficult. Indeed, an intensive acquisition process resulting in dense and uniform sampling is not always possible. Conversely, a simpler acquisition process results in sparse, scattered and noisy data on which parametric functions can hardly be fitted without introducing artefacts. Within this context, we present two contributions. The first one is a robust least-squares-based method for fitting 2D parametric colour functions on sparse and scattered data. Our method works for any amount and distribution of acquired data, as well as for any function expressed as a linear combination of basis functions. We tested our fitting for both image-based rendering surface light fields and image relighting using polynomials and spherical harmonics. The second one is a statistical analysis to measure the robustness of any fitting method. This measure assesses a trade-off between precision of the fitting and stability with respect to input sampling conditions. This analysis along with visual results confirm that our fitting method is robust and reduces reconstruction artefacts for poorly sampled data while preserving the precision for a dense and uniform sampling.
Year
DOI
Venue
2013
10.1111/cgf.12073
Comput. Graph. Forum
Keywords
Field
DocType
image based rendering
Linear combination,Computer vision,Parametric equation,Computer science,Robustness (computer science),Parametric statistics,Basis function,Sampling (statistics),Artificial intelligence,Rendering (computer graphics),Image-based modeling and rendering
Journal
Volume
Issue
ISSN
32
6
0167-7055
Citations 
PageRank 
References 
7
0.43
26
Authors
5
Name
Order
Citations
PageRank
Kenneth Vanhoey1495.52
Basile Sauvage2696.81
Olivier Génevaux3684.88
Frédéric Larue4294.20
Jean-michel Dischler538634.69