61359 20190819101350.0 doi 10.1364/OE.25.011574 sideral 98844 ART-2017-98844 eng (orcid)0000-0001-7530-4306 Arellano, V. Fast back-projection for non-line of sight reconstruction 2017 Access copy available to the general public Unrestricted Recent works have demonstrated non-line of sight (NLOS) reconstruction by using the time-resolved signal from multiply scattered light. These works combine ultrafast imaging systems with computation, which back-projects the recorded space-time signal to build a probabilistic map of the hidden geometry. Unfortunately, this computation is slow, becoming a bottleneck as the imaging technology improves. In this work, we propose a new back-projection technique for NLOS reconstruction, which is up to a thousand times faster than previous work, with almost no quality loss. We base on the observation that the hidden geometry probability map can be built as the intersection of the three-bounce space-time manifolds defined by the light illuminating the hidden geometry and the visible point receiving the scattered light from such hidden geometry. This allows us to pose the reconstruction of the hidden geometry as the voxelization of these space-time manifolds, which has lower theoretic complexity and is easily implementable in the GPU. We demonstrate the efficiency and quality of our technique compared against previous methods in both captured and synthetic data. © 2017 Optical Society of America. info:eu-repo/grantAgreement/ES/MINECO/TIN2016-78753-P info:eu-repo/grantAgreement/ES/MINECO/TIN2014-61696-EXP This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 682080-CHAMELEON info:eu-repo/grantAgreement/EC/H2020/682080/EU/Intuitive editing of visual appearance from real-world datasets/CHAMELEON info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 3.356 2017 OPTICS 19 / 94 = 0.202 2017 Q1 T1 1.519 2017 Atomic and Molecular Physics, and Optics 2017 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0002-7503-7022 Gutierrez, D. Universidad de Zaragoza (orcid)0000-0001-9000-0466 Jarabo, A. 5007 570 Universidad de Zaragoza Dpto. Informát.Ingenie.Sistms. Área Lenguajes y Sistemas Inf. 25, 10 (2017), 11574-11583 Opt. express Optics Express 1094-4087 4256329 http://zaguan.unizar.es/record/61359/files/texto_completo.pdf Versión publicada 98083 http://zaguan.unizar.es/record/61359/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:61359 articulos driver 2019-08-19-09:50:39 ARTICLE