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Automatic calibration of a single-projector catadioptric display system

Benjamin Astre, Laurent Sarry, Christophe Lohou, Eric Zeghers
2008 2008 IEEE Conference on Computer Vision and Pattern Recognition  
Simulation is used to validate estimated values of parameters and distance between the 3D reconstruction of the projection room and its expected geometry.  ...  Influence of noise in detected point coordinates is studied and preliminary results for the reconstruction and projection in real conditions are reported.  ...  Acknowledgements This work is funded by the Audiovisual and Multimedia Program of the French National Agency for Research (Catopsys project).  ... 
doi:10.1109/cvpr.2008.4587788 dblp:conf/cvpr/AstreSLZ08 fatcat:f7fsf74lkzal3e3h7ojlub77ke

A Forward Regridding Method With Minimal Oversampling for Accurate and Efficient Iterative Tomographic Algorithms

Filippo Arcadu, Masih Nilchian, Alain Studer, Marco Stampanoni, Federica Marone
2016 IEEE Transactions on Image Processing  
Most of these iterative algorithms are based on an implementation of the Radon transform that acts as forward projector.  ...  the time required for the reconstruction of underconstrained tomographic data sets without loss in the quality of the results.  ...  of the proposed projector for iterative reconstruction.  ... 
doi:10.1109/tip.2016.2516945 pmid:26800537 fatcat:b6euvsnk5zcz5jnnjto2aenabe

Characterization of digital-micromirror device-based infrared scene projector

José Manuel López-Alonso
2005 Optical Engineering: The Journal of SPIE  
We compare MTF measurements for both mid-wave ͑MWIR͒ and longwave IR ͑LWIR͒ bands for an infrared laser scene projector based on the digital micromirror device ͑DMD͒.  ...  The intended use will be for simulation and target training. Resolution and noise are significant parameters for target perception models of infrared imaging systems.  ...  As expected, MTF performance of the projector was superior for MWIR than for LWIR radiation.  ... 
doi:10.1117/1.2013249 fatcat:6j4nvfdodjey7dxts66l2irs4i

Cuda Parallel Implementation of Image Reconstruction Algorithm for Positron Emission Tomography

Belzunce MA
2012 Open Medical Imaging Journal  
Although the use of iterative algorithms for image reconstruction in 3D Positron Emission Tomography (PET) has shown to produce images with better quality than analytical methods, they are computationally  ...  The Siddon algorithm was used as Projector and Backprojector. Acceleration factors up to 85 times were achieved, with respect to a single thread CPU implementation.  ...  Authors wish to acknowledge the Digital Processing Laboratory (DPLab) of UTN-FRBA for providing the GTX-480 used in the experiments presented in this paper.  ... 
doi:10.2174/1874347101206010108 fatcat:ie7dqyezsnb47igjvgl7ncjxae

Evolution of a high-performance and functionally robust musculoskeletal system in salamanders

Stephen M. Deban, Jeffrey A. Scales, Segall V. Bloom, Charlotte M. Easterling, Mary Kate O'Donnell, Jeffrey P. Olberding
2020 Proceedings of the National Academy of Sciences of the United States of America  
The evolution of ballistic tongue projection in plethodontid salamanders—a high-performance and thermally robust musculoskeletal system—is ideal for examining how the components required for extreme performance  ...  in animal movement are assembled in evolution.  ...  obtaining salamanders; and members of the S.M.D. laboratory for help imaging salamander feeding behavior.  ... 
doi:10.1073/pnas.1921807117 pmid:32341147 fatcat:xyeb73txvfdcbpmqqw7waacyri

High-resolution single-camera photogrammetry: incorporation of refraction at a fluid interface

A. S. González-Vera, T. J. S. Wilting, A. P. C. Holten, G. J. F. van Heijst, M. Duran-Matute
2019 Experiments in Fluids  
The technique requires first for both the camera and the projector to be calibrated using triangulation.  ...  This has the benefit that only one calibration for measurements is needed if the location and shape of the interface are known.  ...  Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creat iveco mmons .org/licen ses/by/4.0/), which permits unrestricted use,  ... 
doi:10.1007/s00348-019-2826-y fatcat:xo5cln2vz5hvhansakqynqabsy

Stochastic Phase Estimation and Unwrapping

Mara Pistellato, Filippo Bergamasco, Andrea Albarelli, Luca Cosmo, Andrea Gasparetto, Andrea Torsello
2019 Proceedings of the 8th International Conference on Pattern Recognition Applications and Methods  
Phase-shift is one of the most effective techniques in 3D structured-light scanning for its accuracy and noise resilience.  ...  However, the periodic nature of the signal causes a spatial ambiguity when the fringe periods are shorter than the projector resolution.  ...  INTRODUCTION The recent evolution of increasingly affordable and powerful 3D sensors and the consolidation of fast reconstruction algorithms enabled the widespread adoption of 3D data in both consumer  ... 
doi:10.5220/0007389402000209 dblp:conf/icpram/PistellatoBACGT19 fatcat:ktptyckgzvfrpdzlk6nxuwcymm

Coarse-to-fine surface reconstruction from silhouettes and range data using mesh deformation

Y. Sahillioğlu, Y. Yemez
2010 Computer Vision and Image Understanding  
Each iteration of the deformation algorithm involves smoothing and restructuring operations to regularize the surface evolution process.  ...  The deformable mesh, which initially represents the object visual hull, is iteratively displaced towards the triangulated range surface using the line-of-sight information.  ...  Acknowledgement This work has been supported by the European Network of Excellence 3DTV (http://www.3dtv-research.org).  ... 
doi:10.1016/j.cviu.2009.12.003 fatcat:icsnfovdpfevrnuvp3iyi4kzoe

Protective Measurement—A New Quantum Measurement Paradigm: Detailed Description of the First Realization

Enrico Rebufello, Fabrizio Piacentini, Alessio Avella, Rudi Lussana, Federica Villa, Alberto Tosi, Marco Gramegna, Giorgio Brida, Eliahu Cohen, Lev Vaidman, Ivo Pietro Degiovanni, Marco Genovese
2021 Applied Sciences  
Furthermore, protective measurement allows finding the expectation value of an observable, i.e., an inherently statistical quantity, by measuring a single particle, without the need for any statistics.  ...  We present a detailed description of the experiment realizing for the first time a protective measurement, a novel measurement protocol which combines weak interactions with a "protection mechanism" preserving  ...  Hence, the expectation value can be evaluated as A = N H − N V N H + N V (8) where N H(V) is the number of count events obtained for the polarization H(V).  ... 
doi:10.3390/app11094260 fatcat:2evetvs2ljh2fahza2whqmwdxy

A priori estimation of memory effects in reduced-order models of nonlinear systems using the Mori–Zwanzig formalism

Ayoub Gouasmi, Eric J. Parish, Karthik Duraisamy
2017 Proceedings of the Royal Society A  
The Mori-Zwanzig (M-Z) procedure allows one to write down formally closed evolution equations for the resolved physics.  ...  Results for under-resolved simulations of the Burgers and Kuramoto-Sivashinsky equations demonstrate that the proposed technique can accurately reconstruct the transfer of information between the resolved  ...  The projector to be used for that set-up is a truncation: (Pf )(x) = f (x, 0) = f (x). (2.8) This projector can be seen as a conditional expectation in the limit where the probability density function  ... 
doi:10.1098/rspa.2017.0385 pmid:28989314 fatcat:x3aoe32yfvcltfff32y2ij5c24

Camera-Projector 3D Scanning of a Semi-Submerged Terrain in a Flume

B. G. H. Gorte, A. Vargas Luna, B. Sirmacek
2013 ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences  
The paper presents a home-made 3d scanner, consisting of off-the-shelf components: a camera and a projector.  ...  It is intended for monitoring dynamics of riverbed mophology observed under laboratory conditions in a flume, which is currently under construction.  ...  Fig. 7 shows the image of decoded projector column numbers in the camera imagery. Values increase from low (blue) at the left side of the image, to high (red) at the right side as expected.  ... 
doi:10.5194/isprsannals-ii-4-w1-13-2013 fatcat:6fe32abx3zhbvcvaxuzd63n7ce

Direct Measurement of the Density Matrix of a Quantum System

G. S. Thekkadath, L. Giner, Y. Chalich, M. J. Horton, J. Banker, J. S. Lundeen
2016 Physical Review Letters  
One drawback of conventional quantum state tomography is that it does not readily provide access to single density matrix elements, since it requires a global reconstruction.  ...  This direct measurement method provides an operational meaning to the density matrix and promises to be especially useful for large dimensional states.  ...  Whichever state jb 0 i that is chosen for the middle complementary projector serves as a reference for zero phase in the density matrix by fixing θ ¼ 0 for all values of a in hajb 0 i ¼ exp ðiθÞ= ffiffiffi  ... 
doi:10.1103/physrevlett.117.120401 pmid:27689255 fatcat:agz2scgbzrdbpaut4dpkolvate

Direct measurement of large-scale quantum states [article]

Eliot Bolduc, Genevieve Gariepy, Jonathan Leach
2015 arXiv   pre-print
In quantum mechanics, predictions are made by way of calculating expectation values of observables, which take the form of Hermitian operators.  ...  Here, we show that the expectation values of a particular set of non-Hermitian matrices, which we call column operators, directly yield the complex coefficients of a quantum state vector.  ...  While we expect unit purity, the 5% noise level accounts for the discrepancy with the measured value.  ... 
arXiv:1506.00851v2 fatcat:pttlyo66pffhvj2zj76q5fj7bm

Experimental neural network enhanced quantum tomography [article]

Adriano Macarone Palmieri, Egor Kovlakov, Federico Bianchi, Dmitry Yudin, Stanislav Straupe, Jacob Biamonte, Sergei Kulik
2019 arXiv   pre-print
Various sophisticated procedures for state and process reconstruction from measured data are well developed and benefit from precise knowledge of the model describing state preparation and the measurement  ...  Quantum tomography is currently ubiquitous for testing any implementation of a quantum information processing device.  ...  The authors acknowledge financial support under the Russian National Quantum Technologies Initiative and thank Timur Tlyachev and Dmitry Dylov for helpful suggestions on an early version of this study,  ... 
arXiv:1904.05902v2 fatcat:44ihchgalffjza2h6oy7whvcty

Intermittency in fractal Fourier hydrodynamics: Lessons from the Burgers equation

Michele Buzzicotti, Luca Biferale, Uriel Frisch, Samriddhi Sankar Ray
2016 Physical review. E  
In particular, we observe a suppression of intermittent fluctuations for D <1 and a quasi-singular transition from the fully intermittent (D=1) to the non-intermittent case for D ≲ 1.  ...  We present theoretical and numerical results for the one-dimensional stochastically forced Burgers equation decimated on a fractal Fourier set of dimension D.  ...  For this, we perform a series of numerical experiments by studying the evolution of the original partial differential equation restricted on a fractal set of Fourier modes [18] .  ... 
doi:10.1103/physreve.93.033109 pmid:27078449 fatcat:cl3hro3pw5cvxeftccpngop4ia
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