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Chapter 5:
Exploiting Temporal Coherence in Photon Density Estimation
Abstract
In this chapter, we introduce a novel framework for
efficient global illumination computation in dynamic
environments. We propose a combination
of energy- and perception-based
error metrics which efficiently guide lighting computation.
Using these metrics, the spatiotemporal coherence in lighting
distribution can be better exploited and accurate
lighting computation can be obtained without degrading
the animation quality as perceived by human observers.
As a result, a perceptually-homogeneous quality of indirect
lighting reconstruction across the spatial and temporal domains is
obtained.
Animations
Scene: ROOM
Spatial filtering: off
On average the same number of photons per frame was used.
In the case of 845,000 the same number of photons collected in the
spatial domain was used as in the case of perception-guided
approach for the temporal domain.
- Traditional approach: no temporal processing (25,000 photons/frame)
(mpg) [0.4 MB]
- Traditional approach: no temporal processing (845,000 photons/frame)
(mpg) [0.4 MB]
- Perception-based approach: with temporal processing (10,000-40,000 photons/frame)
(mpg) [0.4 MB]
Scene: ATRIUM
Spatial filtering: on
On average the same number of photons per frame was used.
- Traditional approach: no temporal processing (20,000 photons/frame)
(mpg) [0.8 MB]
- Perception-based approach: with temporal processing (10,000-40,000 photons/frame)
(mpg) [0.8 MB]