Relevant bibliographies by topics / Direction Reconstruction

Academic literature on the topic 'Direction Reconstruction'

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Published: 11 March 2023

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Journal articles on the topic "Direction Reconstruction"

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Wang, Linyuan, Ailong Cai, Hanming Zhang, Bin Yan, Lei Li, and Guoen Hu. "Distributed Reconstruction via Alternating Direction Method." Computational and Mathematical Methods in Medicine 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/418747.

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With the development of compressive sensing theory, image reconstruction from few-view projections has received considerable research attentions in the field of computed tomography (CT). Total-variation- (TV-) based CT image reconstruction has been shown to be experimentally capable of producing accurate reconstructions from sparse-view data. In this study, a distributed reconstruction algorithm based on TV minimization has been developed. This algorithm is very simple as it uses the alternating direction method. The proposed method can accelerate the alternating direction total variation minimization (ADTVM) algorithm without losing accuracy.
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Wang, Lin Yuan, Ai Long Cai, Bin Yan, Lei Li, Han Ming Zhang, and Guoen Hu. "Inexact Distributed Reconstruction via Alternating Direction Method." Applied Mechanics and Materials 511-512 (February 2014): 417–20. http://dx.doi.org/10.4028/www.scientific.net/amm.511-512.417.

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Total variation (TV)-based CT image reconstruction has been shown to be experimentally capable of producing accurate reconstructions from sparse-view data. In this study, an inexact distributed reconstruction algorithm based on TV minimization has been developed. The algorithm is relatively simple as it uses the inexact alternating direction method, which involves linearization and proximal points techniques. The outstanding acceleration factor is achieved as the algorithm distributes the data and computation to individual nodes. Experimental results demonstrate that the proposed method can accelerate the alternating direction total variation minimization (ADTVM) algorithm with very little accuracy loss.
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Anderson, M. D., F. Baron, and M. C. Bentz. "TLDR: time lag/delay reconstructor." Monthly Notices of the Royal Astronomical Society 505, no. 2 (May 19, 2021): 2903–12. http://dx.doi.org/10.1093/mnras/stab1394.

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ABSTRACT We present the time lag/delay reconstructor (TLDR), an algorithm for reconstructing velocity delay maps in the maximum a posteriori framework for reverberation mapping. Reverberation mapping is a tomographical method for studying the kinematics and geometry of the broad-line region of active galactic nuclei at high spatial resolution. Leveraging modern image reconstruction techniques, including total variation and compressed sensing, TLDR applies multiple regularization schemes to reconstruct velocity delay maps using the alternating direction method of multipliers. Along with the detailed description of the TLDR algorithm we present test reconstructions from TLDR applied to synthetic reverberation mapping spectra as well as a preliminary reconstruction of the Hβ feature of Arp 151 from the 2008 Lick Active Galactic Nuclei Monitoring Project.
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Després, Bruno, and Frédéric Lagoutière. "Genuinely Multi-Dimensional Non-Dissipative Finite-Volume Schemes for Transport." International Journal of Applied Mathematics and Computer Science 17, no. 3 (October 1, 2007): 321–28. http://dx.doi.org/10.2478/v10006-007-0026-z.

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Genuinely Multi-Dimensional Non-Dissipative Finite-Volume Schemes for TransportWe develop a new multidimensional finite-volume algorithm for transport equations. This algorithm is both stable and non-dissipative. It is based on a reconstruction of the discrete solution inside each cell at every time step. The proposed reconstruction, which is genuinely multidimensional, allows recovering sharp profiles in both the direction of the transport velocity and the transverse direction. It constitutes an extension of the one-dimensional reconstructions analyzed in (Lagoutière, 2005; Lagoutière, 2006).
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ZHANG, XIAODONG, SHIRA L. BROSCHAT, and PATRICK J. FLYNN. "A NUMERICAL STUDY OF CONJUGATE GRADIENT DIRECTIONS FOR AN ULTRASOUND INVERSE PROBLEM." Journal of Computational Acoustics 12, no. 04 (December 2004): 587–604. http://dx.doi.org/10.1142/s0218396x04002377.

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In ultrasound inverse problems, the integral equation can be nonlinear, ill-posed, and computationally expensive. One approach to solving such problems is the conjugate gradient (CG) method. A key parameter in the CG method is the conjugate gradient direction. In this paper, we investigate the CG directions proposed by Polyak et al. (PPR), Hestenes and Stiefel (HS), Fletcher and Reeves (FR), Dai and Yuan (YD), and the two-parameter family generalization proposed by Nazareth (TPF). Each direction is applied to three test cases with different contrasts and phase shifts. Test case 1 has low contrast with a phase shift of 0.2π. Reconstruction of the object is obtained for all directions. The performances of the PPR, HS, YD, and TPF directions are comparable, while the FR direction gives the poorest performance. Test case 2 has medium contrast with a phase shift of 0.75π. Reconstruction is obtained for all but the FR direction. The PPR, HS, YD, and TPF directions have similar mean square error; the YD direction takes the least amount of CPU time. Test case 3 has the highest contrast with a phase shift of 1.003π. Only the YD direction gives reasonably accurate results.
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Mannella, C. A., M. Marko, K. Buttle, P. Penczek, A. Leith, and J. Frank. "Tomographic reconstruction of mitochondria." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 740–41. http://dx.doi.org/10.1017/s0424820100140075.

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During oxidative phosphorylation, free energy of substrate oxidation is used to generate electrochemical gradients across the mitochondrial inner membrane. Full understanding of this process requires knowing the pathways for internal diffusion of ions and metabolites inside the organelle. This, in turn, requires detailed information about the organization of the membranes that compartmentalize the mitochondrion and the distribution of transport proteins (proton pumps, ion channels, metabolite carriers) on these membranes.We have undertaken the study of the compartmentation of rat-liver mitochondria (conventionally fixed and plastic-embedded) using electron microscopic tomography. Reconstructions of isolated mitochondria have been computed using projection images collected on the Albany high-voltage electron microscope from sections (0.5-1-μm thick) tilted around one axis over +/− 70° at 2° increments. A problem encountered with this approach is the directional loss of resolution due to the “missing wedge” of information in Fourier space in the direction parallel to the tilt axis. To overcome this problem, we have developed an alignment algorithm that allows projections collected over two or more tilting directions to be used in the same modified back-projection calculation.
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Barbieri, Riccardo, Felix M. Töpfer, Joram Soch, Carsten Bogler, and John-Dylan Haynes. "Reconstruction of motion direction from fMRI data." Journal of Vision 20, no. 11 (October 20, 2020): 1274. http://dx.doi.org/10.1167/jov.20.11.1274.

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Liu, Xinwu, and Lihong Huang. "Poissonian image reconstruction using alternating direction algorithm." Journal of Electronic Imaging 22, no. 3 (August 12, 2013): 033007. http://dx.doi.org/10.1117/1.jei.22.3.033007.

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Varga, László, Péter Balázs, and Antal Nagy. "Direction-dependency of binary tomographic reconstruction algorithms." Graphical Models 73, no. 6 (November 2011): 365–75. http://dx.doi.org/10.1016/j.gmod.2011.06.006.

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Le Hanneur, Malo, Andrew Thoreson, Damien Delgrande, Thibault Lafosse, Jean-David Werthel, Philippe Hardy, and Bassem Elhassan. "Biomechanical Comparison of Anatomic and Extra-Anatomic Reconstruction Techniques Using Local Grafts for Chronic Instability of the Acromioclavicular Joint." American Journal of Sports Medicine 46, no. 8 (May 10, 2018): 1927–35. http://dx.doi.org/10.1177/0363546518770603.

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Background: Anatomic reconstruction techniques are increasingly used to address cases of acromioclavicular (AC) joint chronic instability. These usually involve an additional surgical site for autograft harvesting or an allograft. Purpose: To describe a triple-bundle (TB) anatomic reconstruction using on-site autografts, the semiconjoint tendon (SCT) and the coracoacromial ligament (CAL), and compare its primary stability to the native AC joint ligamentous complex and to a modified Weaver-Dunn (WD) reconstruction. Study Design: Controlled laboratory study. Methods: Intact AC joints of 12 paired cadaveric shoulders were tested for anterior, posterior, and superior translations under cyclic loading with a servo-hydraulic testing system. One shoulder from each pair was randomly assigned to the TB group, where 2 SCT strips were used to reconstruct the coracoclavicular ligaments while the distal end of the CAL was transferred to the distal extremity of the clavicle to reconstruct the AC ligaments; the other shoulder received a modified WD reconstruction. After reconstruction, the same translational testing was performed, with an additional load-to-failure test in the superior direction. Results: In both the TB and the WD groups, no significant differences were found before and after reconstruction in terms of joint displacements after cyclic loading, in all 3 directions. Compared with the WD reconstruction, the TB repair resulted in significantly lower displacements in both the anterior (ie, 2.59 ± 1.08 mm, P = .011) and posterior (ie, 10.17 ± 6.24 mm, P = .014) directions, but not in the superior direction. No significant differences were observed between the 2 reconstructions during the load-to-failure testing, except for the displacement to failure, which was significantly smaller (ie, 5.34 ± 2.97 mm) in the WD group ( P = .037). Conclusion: Anterior, posterior, and superior displacements after an anatomic reconstruction of the AC joint complex using the SCT and CAL as graft material were similar to those of native AC joints and significantly smaller in the axial plane than those of AC joints after a WD repair. Clinical Relevance: An anatomic reconstruction is achievable using the CAL and the SCT as on-site graft materials, providing satisfactory initial stability and thereby allowing earlier mobilization.
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Dissertations / Theses on the topic "Direction Reconstruction"

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Wang, Fan. "Alternating direction methods for image recovery." HKBU Institutional Repository, 2012. https://repository.hkbu.edu.hk/etd_ra/1406.

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Stjärnholm, Sigfrid. "Ghosts of Our Past: Neutrino Direction Reconstruction Using Deep Neural Networks." Thesis, Uppsala universitet, Högenergifysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448765.

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Neutrinos are the perfect cosmic messengers when it comes to investigating the most violent and mysterious astronomical and cosmological events in the Universe. The interaction probability of neutrinos is small, and the flux of high-energy neutrinos decreases quickly with increasing energy. In order to find high-energy neutrinos, large bodies of matter needs to be instrumented. A proposed detector station design called ARIANNA is designed to detect neutrino interactions in the Antarctic ice by measuring radio waves that are created due to the Askaryan effect. In this paper, we present a method based on state-of-the-art machine learning techniques to reconstruct the direction of the incoming neutrino, based on the radio emission that it produces. We trained a neural network with simulated data, created with the NuRadioMC framework, and optimized it to make the best possible predictions. The number of training events used was on the order of 106. Using two different emission models, we found that the network was able to learn and generalize on the neutrino events with good precision, resulting in a resolution of 4-5°. The model could also make good predictions on a dataset even if it was trained with another emission model. The results produced are promising, especially due to the fact that classical techniques have not been able to reproduce the same results without having prior knowledge of where the neutrino interaction took place. The developed neural network can also be used to assess the performance of other proposed detector designs, to quickly and reliably give an indication of which design might yield the most amount of value to the scientific community.
Neutriner är de perfekta kosmiska budbärarna när det kommer till att undersöka de mest våldsamma och mystiska astronomiska och kosmologiska händelserna i vårt universum. Sannolikheten för en neutrinointeraktion är dock liten, och flödet av högenergetiska neutriner minskar kraftigt med energin. För att hitta dessa högenergetiska neutriner måste stora volymer av materia instrumenteras. Ett förslag på en design för en detektorstation kallas ARIANNA, och är framtagen för att detektera neutrinointeraktioner i den antarktiska isen genom att mäta radiopulser som bildas på grund av Askaryan-effekten. I denna rapport presenterar vi en metod baserad på toppmoderna maskininlärningstekniker för att rekonstruera riktningen på en inkommande neutrino, utifrån den radiostrålning som produceras. Vi tränade ett neuralt nätverk med simulerade data, som skapades med hjälp av ramverket NuRadioMC, och optimerade nätverket för att göra så bra förutsägelser som möjligt. Antalet interaktionshändelser som användes för att träna nätverket var i storleksordningen 106. Genom att undersöka två olika emissionsmodeller fann vi att nätverket kunde generalisera med god precision. Detta resulterade i en upplösning på 4-5°. Modellen kunde även göra goda förutsägelser på en datamängd trots att nätverket var tränat med en annan emissionsmodell. De resultat som metoden framtog är lovande, särskilt med avseende på att tidigare klassiska metoder inte har lyckats reproducera samma resultat utan att metoden redan innan vet var i isen som neutrinointeraktionen skedde. Nätverket kan också komma att användas för att utvärdera prestandan hos andra designförslag på detektorstationer för att snabbt och säkert ge en indikation på vilken design som kan tillhandahålla mest vetenskapligt värde.
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Chen, Zhouye. "Reconstruction of enhanced ultrasound images from compressed measurements." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30222/document.

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L'intérêt de l'échantillonnage compressé dans l'imagerie ultrasonore a été récemment évalué largement par plusieurs équipes de recherche. Suite aux différentes configurations d'application, il a été démontré que les données RF peuvent être reconstituées à partir d'un faible nombre de mesures et / ou en utilisant un nombre réduit d'émission d'impulsions ultrasonores. Selon le modèle de l'échantillonnage compressé, la résolution des images ultrasonores reconstruites à partir des mesures compressées dépend principalement de trois aspects: la configuration d'acquisition, c.à.d. l'incohérence de la matrice d'échantillonnage, la régularisation de l'image, c.à.d. l'a priori de parcimonie et la technique d'optimisation. Nous nous sommes concentrés principalement sur les deux derniers aspects dans cette thèse. Néanmoins, la résolution spatiale d'image RF, le contraste et le rapport signal sur bruit dépendent de la bande passante limitée du transducteur d'imagerie et du phénomène physique lié à la propagation des ondes ultrasonores. Pour surmonter ces limitations, plusieurs techniques de traitement d'image en fonction de déconvolution ont été proposées pour améliorer les images ultrasonores. Dans cette thèse, nous proposons d'abord un nouveau cadre de travail pour l'imagerie ultrasonore, nommé déconvolution compressée, pour combiner l'échantillonnage compressé et la déconvolution. Exploitant une formulation unifiée du modèle d'acquisition directe, combinant des projections aléatoires et une convolution 2D avec une réponse impulsionnelle spatialement invariante, l'avantage de ce cadre de travail est la réduction du volume de données et l'amélioration de la qualité de l'image. Une méthode d'optimisation basée sur l'algorithme des directions alternées est ensuite proposée pour inverser le modèle linéaire, en incluant deux termes de régularisation exprimant la parcimonie des images RF dans une base donnée et l'hypothèse statistique gaussienne généralisée sur les fonctions de réflectivité des tissus. Nous améliorons les résultats ensuite par la méthode basée sur l'algorithme des directions simultanées. Les deux algorithmes sont évalués sur des données simulées et des données in vivo. Avec les techniques de régularisation, une nouvelle approche basée sur la minimisation alternée est finalement développée pour estimer conjointement les fonctions de réflectivité des tissus et la réponse impulsionnelle. Une investigation préliminaire est effectuée sur des données simulées
The interest of compressive sampling in ultrasound imaging has been recently extensively evaluated by several research teams. Following the different application setups, it has been shown that the RF data may be reconstructed from a small number of measurements and/or using a reduced number of ultrasound pulse emissions. According to the model of compressive sampling, the resolution of reconstructed ultrasound images from compressed measurements mainly depends on three aspects: the acquisition setup, i.e. the incoherence of the sampling matrix, the image regularization, i.e. the sparsity prior, and the optimization technique. We mainly focused on the last two aspects in this thesis. Nevertheless, RF image spatial resolution, contrast and signal to noise ratio are affected by the limited bandwidth of the imaging transducer and the physical phenomenon related to Ultrasound wave propagation. To overcome these limitations, several deconvolution-based image processing techniques have been proposed to enhance the ultrasound images. In this thesis, we first propose a novel framework for Ultrasound imaging, named compressive deconvolution, to combine the compressive sampling and deconvolution. Exploiting an unified formulation of the direct acquisition model, combining random projections and 2D convolution with a spatially invariant point spread function, the benefit of this framework is the joint data volume reduction and image quality improvement. An optimization method based on the Alternating Direction Method of Multipliers is then proposed to invert the linear model, including two regularization terms expressing the sparsity of the RF images in a given basis and the generalized Gaussian statistical assumption on tissue reflectivity functions. It is improved afterwards by the method based on the Simultaneous Direction Method of Multipliers. Both algorithms are evaluated on simulated and in vivo data. With regularization techniques, a novel approach based on Alternating Minimization is finally developed to jointly estimate the tissue reflectivity function and the point spread function. A preliminary investigation is made on simulated data
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Lu, Chia-Chun [Verfasser], and Werner [Akademischer Betreuer] Hofmann. "An advanced direction reconstruction technique and application to the observation with H.E.S.S. / Chia-Chun Lu ; Betreuer: Werner Hofmann." Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1180299566/34.

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Scrivanti, Gabriele Luca Giovanni. "Nonsmooth Nonconvex Variational Reconstruction for Electrical Impedance Tomography." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20700/.

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Electrical Impedance Tomography is an imaging technique that aims to reconstruct the inner conductivity distribution of a medium starting from a set of measured voltages registered by a series of electrodes that are positioned on the surface of the medium. Such technique was used for the first time in geological studies in 1930 and then applied to industrial procedures. The first clinical use of EIT dates back to 1987. In 2018 EIT was validated in tissue engineering as a noninvasive and label-free imaging and monitoring tool for cell distribution (cell growth, differentiation and tissue formation) in 3D scaffolds. EIT problem can be split into a Forward and an Inverse problem. The aim of Forward EIT is to define the set of measured voltages starting from a known conductivity distribution. If the forward problem is characterized by a nonlinear mapping, called Forward Operator, from the conductivity distribution to the measured voltages, inverse EIT consists of inverting the Forward Operator. This leads to an ill-posed problem which requires regularization, either in the model or in the numerical method that is applied to define the solution. The inverse problem is modelled as a Nonlinear Least Squares problem, where one seeks to minimize the mismatch beetween the measured voltages and the ones generated by the reconstructed conductivity. Reconstruction techniques require the introduction of a regularization term which forces the reconstructed data to stick to certain prior information. In this dissertation, some state-of-the-art regularization methods are analyzed and compared via EIDORS, a specific software for EIT problems. The aim is to reconstruct the variation in conductivity within a 2D section of a 3D scaffold. Furthermore a variational formulation on a 2D mesh for a space-variant regularization is proposed, based on a combination of high order and nonconvex operators, which respectively seek to recover piecewise inhomogeneous and piecewise linear regions.
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Cumani, Paolo. "Analysis and estimation of the scientific performance of the GAMMA-400 experiment." Doctoral thesis, Università degli studi di Trieste, 2015. http://hdl.handle.net/10077/10888.

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2013/2014
Per uno studio completo che parte dalla materia oscura e va all'origine e propagazione dei raggi cosmici, quello multi canale è uno degli approcci migliori per risolvere i quesiti irrisolti della fisica delle astroparticelle. GAMMA-400, grazie alla sua natura duale, dedita allo studio di raggi cosmici (elettroni fino alle energie del TeV e protoni e nuclei fino a 10^{15}-10^{16} eV) e raggi gamma (da 50 MeV fino a qualche TeV), si dedicherà allo studio di questi problemi. Lo scopo di questa tesi è lo studio delle prestazioni di GAMMA-400 per l'osservazione dei raggi gamma. Due diverse configurazioni della geometria sono state studiate: la "baseline" e la cosiddetta configurazione "enhanced". Le principali differenze tra queste due configurazioni si trovano nel tracciatore e nel calorimetro. Il tracciatore della "baseline" è composto da dieci piani di silicio, otto dei quali comprendono anche uno strato di ~0.1 X_0 di tungsteno. Il tracciatore della configurazione "enhanced" è invece composto da 25 piani di silicio inframezzati da uno strato di tungsteno di ~0.03 X_0. Il calorimetro della "baseline" è diviso in due sezioni: una parte composta da due piani di ioduro di cesio e silicio (chiamata "pre-shower") e una seconda parte composta da 28x28x12 cubi di ioduro di cesio. Il calorimetro della configurazione "enhanced" è invece composto solo da 20x20x20 cubi di ioduro di cesio. Per stimare le prestazioni ho sviluppato un algoritmo di ricostruzione della direzione del raggio gamma incidente. La ricostruzione può fare uso delle informazioni provenienti dal tracciatore, dal "pre-shower" o dal calorimetro, sia combinandole che singolarmente. Le direzioni ottenuta grazie alle informazioni del solo "pre-shower" o del solo calorimetro, anche se di minor risoluzione, possono essere utili per aumentare il numero di fotoni visti ad alta energia e per fornire le informazioni necessarie all'osservazione di transienti con i telescopi Cherenkov a terra. La risoluzione angolare utilizzando il tracciatore è migliore nel caso della configurazione "enhanced". A basse energie ciò è possibile grazie al minore tungsteno, e di conseguenza minor "scattering" multiplo, presente all'interno del tracciatore. Il calorimetro più piccolo, e più profondo, seppur ostacolando la ricostruzione dell'energia di fotoni ad alta energia, produce anche un numero minore di particelle di "backsplash" che peggiorano la ricostruzione delle tracce. L'area efficace totale della "baseline", potendo contare su un calorimetro più grande ed il "pre-shower", è più grande rispetto alla configurazione "enhanced". La risoluzione angolare, l'area efficace e la strategia di osservazione dello strumento contribuiscono alla sensitività per sorgenti puntiformi. La sensitività totale dello strumento è migliore per la "baseline" per energie maggiori di 5 GeV. Ho implementato un set prelminare di condizioni di "trigger" per lo studio dei raggi gamma tramite l'utilizzo delle informazioni del tracciatore. La necessità di rigettare la maggior parte delle particelle cariche deriva dall'elevato fondo presente in orbita (~10^6 protoni per raggio gamma) e una capacità di "downlink" limitata (~100 GB/day). Tra le due configurazioni si nota una differenza di meno dell'1% nel numero rimanente di protoni. Seppur promettente, tale risultato deve essere migliorato e possibili miglioramenti sono descritti nella tesi. Gli algoritmi di ricostruzione e "trigger" sono applicati all'analisi della possibilità di studiare "gamma-ray burst" (GRB) con la principale strumentazione a bordo di GAMMA-400. Una stima del numero di eventi non ricostruiti, perchè avvengono nel tempo morto tra due "trigger", è effettuata tramite la simulazione di un ipotetico GRB accoppiata ai tempi di arrivo dei fotoni presi dai dati reali di due GRB osservati da Fermi. In nessuna delle due configurazioni è visibile una percentuale significativa di "pile-up". Anche aumentando il flusso dei GRB la percentuale di eventi non ricostruiti non supera mai il 6%. Nonostante questo risultato, molto dipenderà dal disegno finale dell’elettronica di lettura dei rivelatori che potrebbe aumentare i tempi morti dello strumento.
XXVII Ciclo
1987
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Yeh, Shu-Ying. "Reconstruction of foliations from directional information." Thesis, St Andrews, 2007. http://hdl.handle.net/10023/158.

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Fang, Hao. "Modélisation géométrique à différent niveau de détails d'objets fabriqués par l'homme." Thesis, Université Côte d'Azur (ComUE), 2019. http://www.theses.fr/2019AZUR4002/document.

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La modélisation géométrique d'objets fabriqués par l'homme à partir de données 3D est l'un des plus grands défis de la vision par ordinateur et de l'infographie. L'objectif à long terme est de générer des modèles de type CAO de la manière la plus automatique possible. Pour atteindre cet objectif, des problèmes difficiles doivent être résolus, notamment (i) le passage à l'échelle du processus de modélisation sur des données d'entrée massives, (ii) la robustesse de la méthodologie contre des mesures d'entrées erronés, et (iii) la qualité géométrique des modèles de sortie. Les méthodes existantes fonctionnent efficacement pour reconstruire la surface des objets de forme libre. Cependant, dans le cas d'objets fabriqués par l'homme, il est difficile d'obtenir des résultats dont la qualité approche celle des représentations hautement structurées, comme les modèles CAO. Dans cette thèse, nous présentons une série de contributions dans ce domaine. Tout d'abord, nous proposons une méthode de classification basée sur l'apprentissage en profondeur pour distinguer des objets dans des environnements complexes à partir de nuages de points 3D. Deuxièmement, nous proposons un algorithme pour détecter des primitives planaires dans des données 3D à différents niveaux d'abstraction. Enfin, nous proposons un mécanisme pour assembler des primitives planaires en maillages polygonaux compacts. Ces contributions sont complémentaires et peuvent être utilisées de manière séquentielle pour reconstruire des modèles de ville à différents niveaux de détail à partir de données 3D aéroportées. Nous illustrons la robustesse, le passage à l'échelle et l'efficacité de nos méthodes sur des données laser et multi-vues stéréo sur des scènes composées d'objets fabriqués par l'homme
Geometric modeling of man-made objects from 3D data is one of the biggest challenges in Computer Vision and Computer Graphics. The long term goal is to generate a CAD-style model in an as-automatic-as-possible way. To achieve this goal, difficult issues have to be addressed including (i) the scalability of the modeling process with respect to massive input data, (ii) the robustness of the methodology to various defect-laden input measurements, and (iii) the geometric quality of output models. Existing methods work well to recover the surface of free-form objects. However, in case of manmade objects, it is difficult to produce results that approach the quality of high-structured representations as CAD models.In this thesis, we present a series of contributions to the field. First, we propose a classification method based on deep learning to distinguish objects from raw 3D point cloud. Second, we propose an algorithm to detect planar primitives in 3D data at different level of abstraction. Finally, we propose a mechanism to assemble planar primitives into compact polygonal meshes. These contributions are complementary and can be used sequentially to reconstruct city models at various level-of-details from airborne 3D data. We illustrate the robustness, scalability and efficiency of our methods on both laser and multi-view stereo data composed of man-made objects
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Benli, Emrah. "OMNI-DIRECTIONAL INFRARED 3D RECONSTRUCTION AND TRACKING OF HUMAN TARGETS." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/5036.

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Omni-directional (O-D) infrared (IR) vision is an effective capability for mobile systems in robotics, due to its advantages: illumination invariance, wide field-of-view, ease of identifying heat-emitting objects, and long term tracking without interruption. Unfortunately, O-D IR sensors have low resolution, low frame rates, high cost, sensor noise, and an increase in tracking time. In order to overcome these disadvantages, we propose an autonomous system application in indoor scenarios including 1) Dynamic 3D Reconstruction (D3DR) of the target view in real time images, 2) Human Behavior-based Target Tracking from O-D thermal images, 3) Thermal Multisensor Fusion (TMF), and 4) Visual Perception for Social Cognition from the motion behavior of the human target.
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Collins, Karen Elizabeth. "Reconstruction of late quaternary ice-flow directions, east central Ellesmere Island, Northwest Territory." Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/6718.

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This study identifies Late Quaternary glacial ice-flow direction in east-central Ellesmere Island, N.W.T., by the study of its composition and its relation to bedrock sources. The spatial distribution of five till types suggests a hypothesis which attempts to reconcile the Innuitian Ice Sheet model of Blake with the Franklin Ice Complex model of England. Glaciers draining from ice sheets in northern Ellesmere Island and Greenland filled Kane Basin and flowed southward toward Smith Sound. When this southward-flowing ice reached the bottleneck at Smith Sound (40 km wide), it overrode the adjacent landmasses of Pim Island and Cape Herschel and forced Buchanan Bay ice southward through the channel that is now occupied by Rice Strait. Southward-flowing ice continued to drain towards Baffin Bay, overriding the coastal areas of Nares Strait at Wade Point and Cape Isabella. The results presented here partially support the Innuitian ice sheet hypothesis, but do not negate the Franklin Ice Complex model. (Abstract shortened by UMI.)
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Books on the topic "Direction Reconstruction"

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Directing the dance legacy of Doris Humphrey: The creative impulse of reconstruction. Madison, Wis: The University of Wisconsin Press, 2012.

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Round Table Conference on Strategies and Direction for the Reconstruction and Development of Liberia (1992 Monrovia, Liberia). A report of the Round Table Conference on Strategies and Direction for the Reconstruction and Development of Liberia. Monrovia, Liberia: New African Research & Development Agency in collaboration with Ministry of Planning & Economic Affairs, 1992.

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1938-, Hardman Ken, International Committee of Sport Pedagogy. Symposium, and European College of Sport Science. Congress, eds. Physical education: Deconstruction and reconstruction : issues and directions. Schorndorf: Verlag Karl Hofman, 2003.

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United States. National Aeronautics and Space Administration., ed. SEPEC conference proceedings: Hypermedia & information reconstruction : aerospace applications & research directions, December 3-5, 1990, Houston, Texas. [Washington, DC]: National Aeronautics and Space Administration, 1990.

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Senegal) Symposium international "Reconstruire l'anthropologie en Afrique postcoloniale" (2017 Dakar. Reconstruire l'anthropologie en Afrique postcoloniale: Enjeux, orientations et méthodes d'une nouvelle offre de formation doctorale = Reconstructing postcolonial anthropology : challenges, directions, and methods for a new doctoral program. Dakar: Presses Universitaires de Dakar, 2018.

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Sonsini, Alessandro, ed. Interazione e mobilità per la ricerca. Florence: Firenze University Press, 2007. http://dx.doi.org/10.36253/978-88-8453-627-3.

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Interazione e mobilità per la ricerca – Materiali del 2° seminario Osdotta 2006. This is the second volume of the DOTTA series dealing with research in Architectural Technology doctorates. It documents the 2nd seminar of the Italian PhDs in Architectural Technology, held in Pescara on 14-15-16 September 2006, comprising an account of the event, the materials elaborated in the course of the seminar and the addresses made at the final round table. This reconstruction makes it possible to identify the fields of interest, providing a synoptic overview of the current directions of research trends in our sector, and to compare and confront the contents and methods of the various thematic ambits, underscoring the fundamental research themes most active in this scientific disciplinary sector. Moreover, it also makes it possible to confirm the educational and communication project pursued by Osdotta, both as an educational-administrative structure of an interactive kind, designed to foster a fertile and intense exchange on the lines of research activated within the framework of the doctoral studies in this ambit, and also as an opportunity to identify the problems and expectations of the area, breaking them down into issues concerning the visibility of the scientific community and research into actions useful for the pursuit of even more efficacious results.
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E, Dutkiewicz Józef, Ostaszewska Maria, and Akademia Sztuk Pięknych w Krakowie., eds. Drogi współczesnej konserwacji: Aranżacja, ekspozycja, rekonstrukcja : profesorowi Józefowi E. Dutkiewiczowi w 30 rocznicę śmierci = The directions in modern restoration : restoration arrangements, display, reconstruction : on the thirtieth anniversary of professor Józef E. Dutkiewicz's death. Kraków: Akademia Sztuk Pięknych w Krakowie, 1999.

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Ho, I.-Fan. Aeschylus' Oresteia: A source-oriented reconstruction. 2001.

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A reconstruction of Doris Humphrey's Partita in G major from a Labanotated score. 1990.

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A reconstruction of Doris Humphrey's Partita in G major from a Labanotated score. 1991.

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Book chapters on the topic "Direction Reconstruction"

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Streinu, Ileana, and Elif Tosun. "Camera Position Reconstruction and Tight Direction Networks." In Graph Drawing, 372–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-36151-0_39.

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Varga, László, Péter Balázs, and Antal Nagy. "Direction-Dependency of a Binary Tomographic Reconstruction Algorithm." In Computational Modeling of Objects Represented in Images, 242–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12712-0_22.

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Benfield, Richard W. "Gardens and historic homes; new directions in historic garden tourism." In New directions in garden tourism, 145–55. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789241761.0145.

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Abstract This chapter focuses on historic garden tourism and the current management and development of historic gardens. Here the focus is on landscape, which is a more holistic approach to historic sites, and marks innovation in historic garden tourism. In this chapter, examples are presented of the four strategies of preservation, reconstruction, restoration, renovation; and the fifth new direction of landscape integration. A case study is presented of the Bellamy-Ferriday House & Garden in Bethlehem, Connecticut, USA.
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Benfield, Richard W. "Gardens and historic homes; new directions in historic garden tourism." In New directions in garden tourism, 145–55. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789241761.0010.

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Abstract This chapter focuses on historic garden tourism and the current management and development of historic gardens. Here the focus is on landscape, which is a more holistic approach to historic sites, and marks innovation in historic garden tourism. In this chapter, examples are presented of the four strategies of preservation, reconstruction, restoration, renovation; and the fifth new direction of landscape integration. A case study is presented of the Bellamy-Ferriday House & Garden in Bethlehem, Connecticut, USA.
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Liu, Wei, Xiaozheng Liu, Xiaofu He, Zhenyu Zhou, Ying Wen, Yongdi Zhou, Bradley S. Peterson, and Dongrong Xu. "Spatial Normalization of Diffusion Tensor Images with Voxel-Wise Reconstruction of the Diffusion Gradient Direction." In Multimodal Brain Image Analysis, 134–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33530-3_11.

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Gillham, Bill. "Directions of Change*." In Reconstructing Educational Psychology, 11–23. London: Routledge, 2022. http://dx.doi.org/10.4324/9781003279853-1.

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Sisti, Andrea. "Future Directions of Vascularized Composite Allotransplantation." In Reconstructive Transplantation, 357–65. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-21520-9_33.

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Rabiger, Michael, and Courtney Hermann. "Reconstruction, Re-Enactment and Docudrama." In Directing the Documentary, 325–33. Seventh edition. | London; New York: Routledge, 2020.: Routledge, 2020. http://dx.doi.org/10.4324/9780429280382-28.

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Ferretti, Andrea, Edoardo Monaco, and Alessandro Annibaldi. "Future Directions: ACL Repair vs Reconstruction." In Anterolateral Rotatory Instability in ACL Deficient Knee, 163–76. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-00115-4_14.

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Burch, Kerry T. "Jeffersonian Directions in Curricular Renovation." In Jefferson’s Revolutionary Theory and the Reconstruction of Educational Purpose, 163–89. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45763-1_11.

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Conference papers on the topic "Direction Reconstruction"

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Baron, Fabien. "Interferometric image reconstruction: techniques, results, and future direction." In SPIE Astronomical Telescopes + Instrumentation, edited by Fabien Malbet, Michelle J. Creech-Eakman, and Peter G. Tuthill. SPIE, 2016. http://dx.doi.org/10.1117/12.2233392.

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Plaisier, Ilse, Juan A. Aguilar, Patrick Allison, James J. Beatty, Hans Bernhoff, David Zeke Besson, Nils Bingefors, et al. "Direction reconstruction for the Radio Neutrino Observatory Greenland." In 37th International Cosmic Ray Conference. Trieste, Italy: Sissa Medialab, 2021. http://dx.doi.org/10.22323/1.395.1026.

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Miller, Markus, Alfred Nischwitz, and Rüdiger Westermann. "Deep Light Direction Reconstruction from single RGB images." In WSCG'2021 - 29. International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision'2021. Západočeská univerzita, 2021. http://dx.doi.org/10.24132/csrn.2021.3002.4.

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In augmented reality applications, consistent illumination between virtual and real objects is important for creatingan immersive user experience. Consistent illumination can be achieved by appropriate parameterisation of thevirtual illumination model, that is consistent with real-world lighting conditions. In this study, we developed amethod to reconstruct the general light direction from red-green-blue (RGB) images of real-world scenes using amodified VGG-16 neural network. We reconstructed the general light direction as azimuth and elevation angles. Toavoid inaccurate results caused by coordinate uncertainty occurring at steep elevation angles, we further introducedstereographically projected coordinates. Unlike recent deep-learning-based approaches for reconstructing the lightsource direction, our approach does not require depth information and thus does not rely on special red-green-blue-depth (RGB-D) images as input.
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Zhang, Liguo, Jianguo Sun, Hongtao Song, and Yiran Shen. "Normal direction local binary pattern for fragment reconstruction." In 2017 IEEE International Conference on Multimedia and Expo (ICME). IEEE, 2017. http://dx.doi.org/10.1109/icme.2017.8019439.

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Yang, Ruiming, Yipeng Liu, Qun Wan, and Wanlin Yang. "Direction Finding via Beam Scanning and Sparse Reconstruction." In 2010 Second International Conference on Networks Security, Wireless Communications and Trusted Computing. IEEE, 2010. http://dx.doi.org/10.1109/nswctc.2010.139.

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Miller, Markus, Alfred Nischwitz, and Rüdiger Westermann. "Deep Light Direction Reconstruction from single RGB images." In WSCG'2021 - 29. International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision'2021. Západočeská univerzita, 2021. http://dx.doi.org/10.24132/csrn.2021.3101.4.

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In augmented reality applications, consistent illumination between virtual and real objects is important for creating an immersive user experience. Consistent illumination can be achieved by appropriate parameterisation of the virtual illumination model, that is consistent with real-world lighting conditions. In this study, we developed a method to reconstruct the general light direction from red-green-blue (RGB) images of real-world scenes using a modified VGG-16 neural network. We reconstructed the general light direction as azimuth and elevation angles. To avoid inaccurate results caused by coordinate uncertainty occurring at steep elevation angles, we further introduced stereographically projected coordinates. Unlike recent deep-learning-based approaches for reconstructing the light source direction, our approach does not require depth information and thus does not rely on special red-green-blue- depth (RGB-D) images as input.
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Ladas, Kostas T., George A. Tsihrintzis, and Mohammad Maleki. "Contour reconstruction in computer-aided holography." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.mff3.

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In this presentation we generate images of the directional derivative and the Laplacian of the complex index of refraction of a weakly inhomogeneous scattering object. The object is embedded in a known background medium and is probed with coherent plane optical wavefields. The intensity distribution of the wavefields diffracted by the object is then recorded over lines perpendicular to the direction of propagation of the incident waves and is used as input data to a diffraction-tomographic procedure that generates estimates (reconstructions) of the directional derivative and the Laplacian of the index of refraction of the scatterer. The reconstruction algorithm is of the usual filtered-back-propagation type of diffraction tomography,1 in which appropriate modification of the tomographic filter is required. The success of the procedure, even when only intensity data are available (as is the case in the usual optical scattering experiments),2 is discussed briefly and is verified through a number of examples that use both synthetic and experimental data.
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Grigoryan, Artyom M. "Decomposition by series direction images: image reconstruction and enhancement." In IS&T/SPIE Electronic Imaging, edited by Jaakko T. Astola, Karen O. Egiazarian, Nasser M. Nasrabadi, and Syed A. Rizvi. SPIE, 2009. http://dx.doi.org/10.1117/12.804600.

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Wang, Feng, Xiaowei Cui, and Mingquan Lu. "Decoupled 2D Direction Finding Based on Sparse Signal Reconstruction." In 2014 IEEE Military Communications Conference (MILCOM). IEEE, 2014. http://dx.doi.org/10.1109/milcom.2014.55.

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Fang, Tong, Qiang Liu, and Dongliang Cui. "Multi-direction Reconstruction for Fault Diagnosis of Train Bearings." In 2018 International Conference on Intelligent Rail Transportation (ICIRT). IEEE, 2018. http://dx.doi.org/10.1109/icirt.2018.8641612.

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Reports on the topic "Direction Reconstruction"

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Barton, Frederick D. Testimony: Statement of Frederick D. Barton, Senior Fellow and Director, Post-Conflict Reconstruction Project, Center for Strategic and International Studies, before the Committee on Foreign Relations, United States Senate on Accelerating Economic Progress in Iraq"". Fort Belvoir, VA: Defense Technical Information Center, July 2005. http://dx.doi.org/10.21236/ada438876.

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Удріс, Ірина Миколаївна, and Наталя Сергіївна Удріс-Бородавко. Design of the Franco-Belgian Exhibition Poster of the 1890-s in the Context of the Art Nouveau Style Formation. КНУКіМ, 2019. http://dx.doi.org/10.31812/123456789/5087.

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The purpose of the article is to determine the artistic and graphic peculiarities of the Franco-Belgian exhibition poster of the 1890s in the context of the formation of the Art Nouveau style. The research methodology of the work is based on the use of traditional art methods: historical and cultural, reconstructive and model, historical and attributive, which contributed to the revealing of artistic and graphic transformations in the field of Franco-Belgian spectacular poster. The scientific novelty of the article lies in the author’s artistic interpretation of the stylistic manner of the creators of the spectacular poster in “style floreale” as one of the leading directions of the development of the artistic style of that period. The distinctive features of this type of the artistic work are outlined on the basis of the review of the stylistic and image transformations of exhibition posters of the famous artists – J. Chéret, A. Toulouse-Lautrec, E. Grasset, A. Mucha, A. Privat-Livemont and others. Attention is focused on the identification of the presentation features of the advertised exhibition events as an important cultural events of that time. Means of artistic visualization of information are studied taking into consideration the specific nature of the poster. Conclusions. In the general cultural and historical context of that time, the poster has become a significant component of the formation of national trends in the artistic style of the day, in particular - the Franco-Belgian Art Nouveau style. The exhibition poster, reflecting the stylistic landmarks of the time, contributed to the formation of the artistic vision as a manifestation of the cultural and artistic landmarks of the studied period.
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Coombs, HC (Director of Reconstruction) with Mrs Oliphant and Professor RC Mills - January 1947. Reserve Bank of Australia, September 2022. http://dx.doi.org/10.47688/rba_archives_pn-002885.

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GOVERNORS & SENIOR PERSONNEL - Dr H.C. Coombs - Correspondence, Diaries and Speeches - Broadcast - ?People & Planning? (Director-General of Post-War Reconstruction). Reserve Bank of Australia, September 2022. http://dx.doi.org/10.47688/rba_archives_2006/04349.

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