Adaptive Filtering for Progressive Monte Carlo Image Rendering
Frank Suykens | Yves Willems |
Contact: Frank Suykens
Visualization and Interactive Digital Media 2000 (Proceedings of the 8th International Conference in Central Europe on Computer Graphics), p. 220-227
Plzen, Czech Republic (7-10 February 2000)
Abstract
Image filtering is often applied as a post-process to Monte Carlo generated pictures, in order to reduce noise. In this paper we present an algorithm based on density estimation techniques that applies an energy preserving adaptive kernel filter to individual samples during image rendering. The used kernel widths diminish as the number of samples goes up, ensuring a reasonable noise versus bias trade-off at any time. This results in a progressive algorithm, that still converges asymptotically to a correct solution. Results show that general noise as well as spike noise can effectively be reduced. Many interesting extensions are possible, making this a very promising technique for Monte Carlo image synthesis.
Keywords: global illumination, Monte Carlo, density estimation, bidirectional path tracing, image filtering