Linear inversion of ban limit reflection seismograms
SIAM Journal on Scientific and Statistical Computing
A practical model for subsurface light transport
Proceedings of the 28th annual conference on Computer graphics and interactive techniques
A practical model for subsurface light transport
Proceedings of the 28th annual conference on Computer graphics and interactive techniques
Structured Light in Scattering Media
ICCV '05 Proceedings of the Tenth IEEE International Conference on Computer Vision (ICCV'05) Volume 1 - Volume 01
Stereo Matching with Linear Superposition of Layers
IEEE Transactions on Pattern Analysis and Machine Intelligence
Coded exposure photography: motion deblurring using fluttered shutter
ACM SIGGRAPH 2006 Papers
Single view reflectance capture using multiplexed scattering and time-of-flight imaging
Proceedings of the 2011 SIGGRAPH Asia Conference
Recovery of a sparse spike time series by L1 normdeconvolution
IEEE Transactions on Signal Processing
On the Uniqueness of Nonnegative Sparse Solutions to Underdetermined Systems of Equations
IEEE Transactions on Information Theory
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
International Journal of Computer Vision
Femto-photography: capturing and visualizing the propagation of light
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
Multifrequency time of flight in the context of transient renderings
ACM SIGGRAPH 2013 Posters
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Time of flight cameras produce real-time range maps at a relatively low cost using continuous wave amplitude modulation and demodulation. However, they are geared to measure range (or phase) for a single reflected bounce of light and suffer from systematic errors due to multipath interference. We re-purpose the conventional time of flight device for a new goal: to recover per-pixel sparse time profiles expressed as a sequence of impulses. With this modification, we show that we can not only address multipath interference but also enable new applications such as recovering depth of near-transparent surfaces, looking through diffusers and creating time-profile movies of sweeping light. Our key idea is to formulate the forward amplitude modulated light propagation as a convolution with custom codes, record samples by introducing a simple sequence of electronic time delays, and perform sparse deconvolution to recover sequences of Diracs that correspond to multipath returns. Applications to computer vision include ranging of near-transparent objects and subsurface imaging through diffusers. Our low cost prototype may lead to new insights regarding forward and inverse problems in light transport.