Temporal gradient-domain path tracing

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2016-11

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Department of Computer Science

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Language

en

Pages

1-9

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ACM TRANSACTIONS ON GRAPHICS, Volume 35, issue 6

Abstract

We present a novel approach to improve temporal coherence in Monte Carlo renderings of animation sequences. Unlike other approaches that exploit temporal coherence in a post-process, our technique does so already during sampling. Building on previous gradient-domain rendering techniques that sample finite differences over the image plane, we introduce temporal finite differences and formulate a corresponding 3D spatio-temporal screened Poisson reconstruction problem that is solved over windowed batches of several frames simultaneously. We further extend our approach to include second order, mixed spatio-temporal differences, an improved technique to compute temporal differences exploiting motion vectors, and adaptive sampling. Our algorithm can be built on a gradient-domain path tracer without large modifications. In particular, we do not require the ability to evaluate animation paths over multiple frames. We demonstrate that our approach effectively reduces temporal flickering in animation sequences, significantly improving the visual quality compared to both path tracing and gradient-domain rendering of individual frames.

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DOI

10.1145/2980179.2980256

Citation

Manzi, M, Kettunen, M, Durand, F, Zwicker, M & Lehtinen, J 2016, ' Temporal gradient-domain path tracing ', ACM Transactions on Graphics, vol. 35, no. 6, 246, pp. 1-9 . https://doi.org/10.1145/2980179.2980256

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https://urn.fi/URN:NBN:fi:aalto-201802091486

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[article-cris] Perustieteiden korkeakoulu / SCI