Single view reflectance capture using multiplexed scattering and time-of-flight imaging
Proceedings of the 2011 SIGGRAPH Asia Conference
Looking Around the Corner using Ultrafast Transient Imaging
International Journal of Computer Vision
Estimating Motion and size of moving non-line-of-sight objects in cluttered environments
CVPR '11 Proceedings of the 2011 IEEE Conference on Computer Vision and Pattern Recognition
Relativistic ultrafast rendering using time-of-flight imaging
ACM SIGGRAPH 2012 Talks
CVPR '12 Proceedings of the 2012 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
Decomposing global light transport using time of flight imaging
CVPR '12 Proceedings of the 2012 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
Frequency analysis of transient light transport with applications in bare sensor imaging
ECCV'12 Proceedings of the 12th European conference on Computer Vision - Volume Part I
Low-budget transient imaging using photonic mixer devices
ACM Transactions on Graphics (TOG) - SIGGRAPH 2013 Conference Proceedings
Low-budget transient imaging using photonic mixer devices
ACM Transactions on Graphics (TOG) - SIGGRAPH 2013 Conference Proceedings
ACM Transactions on Graphics (TOG)
Decomposing Global Light Transport Using Time of Flight Imaging
International Journal of Computer Vision
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We present femto-photography, a novel imaging technique to capture and visualize the propagation of light. With an effective exposure time of 1.85 picoseconds (ps) per frame, we reconstruct movies of ultrafast events at an equivalent resolution of about one half trillion frames per second. Because cameras with this shutter speed do not exist, we re-purpose modern imaging hardware to record an ensemble average of repeatable events that are synchronized to a streak sensor, in which the time of arrival of light from the scene is coded in one of the sensor's spatial dimensions. We introduce reconstruction methods that allow us to visualize the propagation of femtosecond light pulses through macroscopic scenes; at such fast resolution, we must consider the notion of time-unwarping between the camera's and the world's space-time coordinate systems to take into account effects associated with the finite speed of light. We apply our femto-photography technique to visualizations of very different scenes, which allow us to observe the rich dynamics of time-resolved light transport effects, including scattering, specular reflections, diffuse interreflections, diffraction, caustics, and subsurface scattering. Our work has potential applications in artistic, educational, and scientific visualizations; industrial imaging to analyze material properties; and medical imaging to reconstruct subsurface elements. In addition, our time-resolved technique may motivate new forms of computational photography.