NDLI: Fourier depth of field

Content Provider	ACM Digital Library
Author	Subr, Kartic Soler, Cyril Sillion, François Holzschuch, Nicolas Durand, Frédo
Copyright Year	2009
Abstract	Optical systems used in photography and cinema produce depth-of-field effects, that is, variations of focus with depth. These effects are simulated in image synthesis by integrating incoming radiance at each pixel over the lense aperture. Unfortunately, aperture integration is extremely costly for defocused areas where the incoming radiance has high variance, since many samples are then required for a noise-free Monte Carlo integration. On the other hand, using many aperture samples is wasteful in focused areas where the integrand varies little. Similarly, image sampling in defocused areas should be adapted to the very smooth appearance variations due to blurring. This article introduces an analysis of focusing and depth-of-field in the frequency domain, allowing a practical characterization of a light field's frequency content both for image and aperture sampling. Based on this analysis we propose an adaptive depth-of-field rendering algorithm which optimizes sampling in two important ways. First, image sampling is based on conservative bandwidth prediction and a splatting reconstruction technique ensures correct image reconstruction. Second, at each pixel the variance in the radiance over the aperture is estimated and used to govern sampling. This technique is easily integrated in any sampling-based renderer, and vastly improves performance.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	07300301
e-ISSN	15577368
DOI	10.1145/1516522.1516529
Volume Number	28
Issue Number	2
Journal	ACM Transactions on Graphics (TOG)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2009-05-13
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Depth of field Fourier analysis of light transport Sampling
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design

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