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Abstract

Recent advances in ultra-fast imaging have triggered many promising applications in graphics and vision, such as capturing transparent objects, estimating hidden geometry and materials, or visualizing light in motion. There is, however, very little work regarding the effective simulation and analysis of transient light transport, where the speed of light can no longer be considered infinite. We first introduce the transient path integral framework, formally describing light transport in transient state. We then analyze the difficulties arising when considering the light's time-of-flight in the simulation (rendering) of images and videos. We propose a novel density estimation technique that allows reusing sampled paths to reconstruct time-resolved radiance, and devise new sampling strategies that take into account the distribution of radiance along time in participating media. We then efficiently simulate time-resolved phenomena (such as caustic propagation, fluorescence or temporal chromatic dispersion), which can help design future ultra-fast imaging devices using an analysis-by-synthesis approach, as well as to achieve a better understanding of the nature of light transport.

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Bibtex

@article{JaraboSIGA14, author = {Jarabo, Adrian and Marco, Julio and Mu\~{n}oz, Adolfo and Buisan, Raul and Jarosz, Wojciech and Gutierrez, Diego}, title = {A Framework for Transient Rendering}, journal = {ACM Transactions on Graphics (SIGGRAPH Asia 2014)}, volume = {33}, number = {6}, articleno = {177}, year = {2014}, }
Related Bibtex
@article{VeltenSIG13, author = {Velten, Andreas and Wu, Di and Jarabo, Adrian and Masia, Belen and Barsi, Christopher and Joshi, Chinmaya and Lawson, Everett and Bawendi, Moungi G. and Gutierrez, Diego and Raskar, Ramesh}, title = {Femto-Photography: Capturing and Visualizing the Propagation of Light}, journal = {ACM Transactions on Graphics (SIGGRAPH 2013)}, volume = {32}, number = {4}, year = {2013}, }
@article{JaraboCGF2015, author = {Adrian Jarabo and Belen Masia and Andreas Velten and Christopher Barsi and Ramesh Raskar and Diego Gutierrez}, title = {Relativistic Effects for Time-Resolved Light Transport}, journal = {Computer Graphics Forum}, volume = {to appear}, year = {2015}, }
@inproceedings{JaraboCEIG2013, author = {Adrian Jarabo and Belen Masia and Andreas Velten and Christopher Barsi and Ramesh Raskar and Diego Gutierrez}, title = {Rendering Relativistic Effects in Transient Imaging}, booktitle = {Congreso Espa\~nol de Inform\'atica Gr\'afica(CEIG'13)}, year = {2013}, }
@mastersthesis{Jarabo2012, author = {Adrian Jarabo}, school = {Universidad de Zaragoza}, title = {Femto-photography: Visualizing light in motion}, year = {2012}, }

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Acknowledgements

We want to thank the reviewers for their insightful comments, and Mubbasir Kapadia for the link to sound rendering papers. This research has been partially funded by the European Commission, 7th Framework Programme, through projects GOLEM and VERVE, the Spanish Ministry of Economy and Competitiveness through project LIGHTSLICE, and project TAMA.