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Relevant bibliographies by topics / Isocontours

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Journal articles
Dissertations / Theses
Book chapters
Conference papers

Academic literature on the topic 'Isocontours'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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Journal articles on the topic "Isocontours"

1

Hazarika, Subhashis, Ayan Biswas, Soumya Dutta, and Han-Wei Shen. "Information Guided Exploration of Scalar Values and Isocontours in Ensemble Datasets." Entropy 20, no. 7 (July 20, 2018): 540. http://dx.doi.org/10.3390/e20070540.

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Uncertainty of scalar values in an ensemble dataset is often represented by the collection of their corresponding isocontours. Various techniques such as contour-boxplot, contour variability plot, glyphs and probabilistic marching-cubes have been proposed to analyze and visualize ensemble isocontours. All these techniques assume that a scalar value of interest is already known to the user. Not much work has been done in guiding users to select the scalar values for such uncertainty analysis. Moreover, analyzing and visualizing a large collection of ensemble isocontours for a selected scalar value has its own challenges. Interpreting the visualizations of such large collections of isocontours is also a difficult task. In this work, we propose a new information-theoretic approach towards addressing these issues. Using specific information measures that estimate the predictability and surprise of specific scalar values, we evaluate the overall uncertainty associated with all the scalar values in an ensemble system. This helps the scientist to understand the effects of uncertainty on different data features. To understand in finer details the contribution of individual members towards the uncertainty of the ensemble isocontours of a selected scalar value, we propose a conditional entropy based algorithm to quantify the individual contributions. This can help simplify analysis and visualization for systems with more members by identifying the members contributing the most towards overall uncertainty. We demonstrate the efficacy of our method by applying it on real-world datasets from material sciences, weather forecasting and ocean simulation experiments.

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Li, Xinbai, Boqiang Shen, Heming Wang, Ki Youl Yang, Xu Yi, Qi-Fan Yang, Zhiping Zhou, and Kerry Vahala. "Universal isocontours for dissipative Kerr solitons." Optics Letters 43, no. 11 (May 23, 2018): 2567. http://dx.doi.org/10.1364/ol.43.002567.

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Baum, Moritz, Valentin Buchhold, Julian Dibbelt, and Dorothea Wagner. "Fast Exact Computation of Isocontours in Road Networks." ACM Journal of Experimental Algorithmics 24 (December 17, 2019): 1–26. http://dx.doi.org/10.1145/3355514.

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Rosenholtz, R. "Search isocontours as a tool for understanding visual search." Journal of Vision 3, no. 9 (March 18, 2010): 630. http://dx.doi.org/10.1167/3.9.630.

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Pothkow, Kai, and Hans-Christian Hege. "Positional Uncertainty of Isocontours: Condition Analysis and Probabilistic Measures." IEEE Transactions on Visualization and Computer Graphics 17, no. 10 (October 2011): 1393–406. http://dx.doi.org/10.1109/tvcg.2010.247.

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Lewiner, Thomas, Hélio Lopes, Luiz Velho, and Vinícius Mello. "Extraction and compression of hierarchical isocontours from image data." Computerized Medical Imaging and Graphics 30, no. 4 (June 2006): 231–42. http://dx.doi.org/10.1016/j.compmedimag.2006.05.004.

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Williams, Rohan B., Anupam Pal, James G. Brasseur, and Ian J. Cook. "Space-time pressure structure of pharyngo-esophageal segment during swallowing." American Journal of Physiology-Gastrointestinal and Liver Physiology 281, no. 5 (November 1, 2001): G1290—G1300. http://dx.doi.org/10.1152/ajpgi.2001.281.5.g1290.

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We applied high-resolution manometry with spatiotemporal data interpolation and simultaneous videofluoroscopy to normal pharyngeal swallows to correlate specific features in the space-time intraluminal pressure structure with physiological events and normal deglutitive transsphincteric bolus flow to define normal biomechanical properties of the pharyngo-esophageal (PE) segment. Pressures were recorded by microperfused catheter, and the two-dimensional space-time data sets were plotted as isocontours. On these were superimposed bolus trajectories, anatomic segment movements, and hyo-laryngeal trajectories from concurrent videofluoroscopy. Correlation of the highly reproducible space-time-pressure structure with radiographic images confirmed that primary deglutitive PE segment functions (pressure profile, laryngeal elevation, axial sphincter motion, timing of relaxation, contraction) are accurately discernible from single isocontour pressure visualization. Pressure during bolus flow was highly dependent on axial location within PE segment and time instant. The intrabolus pressure domain, corresponding to the space-time region between bolus head and tail trajectories, demonstrated significant bolus volume dependence. High-resolution manometry accurately, comprehensively, and highly reproducibly depicts the PE segment space-time-pressure structure and specific physiological events related to upper esophageal sphincter opening and transsphincteric flow during normal swallowing. Intrabolus pressure variations are highly dependent on position within the PE segment and time.

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Kern, Mark, Francis O. Edeani, Shaina M. Lynch, Patrick Sanvanson, Ling Mei, Chris Crumb, and Reza Shaker. "Mo1519 - Machine Learning Techniques for Classifying High Resolution Manometric Isocontours." Gastroenterology 154, no. 6 (May 2018): S—738. http://dx.doi.org/10.1016/s0016-5085(18)32570-8.

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Collins, C., G. Penn, and S. Carpendale. "Bubble Sets: Revealing Set Relations with Isocontours over Existing Visualizations." IEEE Transactions on Visualization and Computer Graphics 15, no. 6 (November 2009): 1009–16. http://dx.doi.org/10.1109/tvcg.2009.122.

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Poethkow, Kai, Christoph Petz, and Hans-Christian Hege. "APPROXIMATE LEVEL-CROSSING PROBABILITIES FOR INTERACTIVE VISUALIZATION OF UNCERTAIN ISOCONTOURS." International Journal for Uncertainty Quantification 3, no. 2 (2013): 101–17. http://dx.doi.org/10.1615/int.j.uncertaintyquantification.2012003958.

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Dissertations / Theses on the topic "Isocontours"

1

Zhang, Xiaoyu. "Scalable isocontour visualization for large datasets /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3064695.

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Benrhaiem, Rania. "Méthodes d’analyse de mouvement en vision 3D : invariance aux délais temporels entre des caméras non synchronisées et flux optique par isocontours." Thèse, 2016. http://hdl.handle.net/1866/18469.

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Cette thèse porte sur deux sujets de vision par ordinateur axés sur l’analyse de mouvement dans une scène dynamique vue par une ou plusieurs caméras. En premier lieu, nous avons travaillé sur le problème de la capture de mouvement avec des caméras non synchronisées. Ceci entraı̂ne généralement des erreurs de mise en correspondance 2D et par la suite des erreurs de reconstruction 3D. En contraste avec les solutions matérielles déjà existantes qui essaient de minimiser voire annuler le délai temporel entre les caméras, nous avons proposé une solution qui assure une invariance aux délais. En d’autres termes, nous avons développé une méthode qui permet de trouver la bonne mise en correspondance entre les points à reconstruire indépendamment du délai temporel. En second lieu, nous nous sommes intéressés au problème du flux optique avec une approche différente des méthodes proposées dans l’état de l’art. Le flux optique est utilisé pour l’analyse de mouvement en temps réel. Il est donc important qu’il soit calculé rapidement. Généralement, les méthodes existantes de flux optique sont classées en deux principales catégories: ou bien à la fois denses et précises mais très exigeantes en calcul, ou bien rapides mais moins denses et moins précises. Nous avons proposé une alternative qui tient compte à la fois du temps de calcul et de la précision du résultat. Nous avons proposé d’utiliser les isocontours d’intensité et de les mettre en correspondance afin de retrouver le flux optique en question. Ces travaux ont amené à deux principales contributions intégrées dans les chapitres de la thèse.
In this thesis we focused on two computer vision subjects. Both of them concern motion analysis in a dynamic scene seen by one or more cameras. The first subject concerns motion capture using unsynchronised cameras. This causes many correspondence errors and 3D reconstruction errors. In contrast with existing material solutions trying to minimize the temporal delay between the cameras, we propose a software solution ensuring an invariance to the existing temporal delay. We developed a method that finds the good correspondence between points regardless of the temporal delay. It solves the resulting spatial shift and finds the correct position of the shifted points. In the second subject, we focused on the optical flow problem using a different approach than the ones in the state of the art. In most applications, optical flow is used for real-time motion analysis. It is then important to be performed in a reduced time. In general, existing optical flow methods are classified into two main categories: either precise and dense but computationally intensive, or fast but less precise and less dense. In this work, we propose an alternative solution being at the same time, fast and precise. To do this, we propose extracting intensity isocontours to find corresponding points representing the related optical flow. By addressing these problems we made two major contributions.

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Book chapters on the topic "Isocontours"

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Younes, Laurent. "Isocontours and Isosurfaces." In Shapes and Diffeomorphisms, 105–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12055-8_5.

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Apfelbaum, Evgeny, and Vladimir Vorob’ev. "The Generalized Similarity Laws and Isocontours in the Thermodynamics of Simple Liquids." In Springer Proceedings in Physics, 139–61. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20875-6_6.

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Mascarenhas, Ajith, and Jack Snoeyink. "Isocontour based Visualization of Time-varying Scalar Fields." In Mathematics and Visualization, 41–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/b106657_3.

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Moore, Doug, and Joe Warren. "COMPACT ISOCONTOURS FROM SAMPLED DATA." In Graphics Gems III (IBM Version), 23–28. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-08-050755-2.50015-4.

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Conference papers on the topic "Isocontours"

1

Bruno and Williamson. "Representations of Isocontours on a Spherical Head." In Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.590520.

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Bruno, Antonio C., and Samuel J. Williamson. "Representations of isocontours on a spherical head." In 1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.5762223.

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Gandhi, Sorabh, John Hershberger, and Subhash Suri. "Approximate isocontours and spatial summaries for sensor networks." In the 6th international conference. New York, New York, USA: ACM Press, 2007. http://dx.doi.org/10.1145/1236360.1236411.

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Gandhi, Sorabh, John Hershberger, and Subhash Suri. "Approximate Isocontours and Spatial Summaries for Sensor Networks." In 2007 6th International Symposium on Information Processing in Sensor Networks. IEEE, 2007. http://dx.doi.org/10.1109/ipsn.2007.4379700.

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Gavrilescu, Marius. "Efficient Exploration of 3D Medical Images Using Projected Isocontours." In 2019 E-Health and Bioengineering Conference (EHB). IEEE, 2019. http://dx.doi.org/10.1109/ehb47216.2019.8969969.

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Shiradkar, Rakesh, and Sim Heng Ong. "Surface reconstruction using isocontours of constant depth and gradient." In 2013 20th IEEE International Conference on Image Processing (ICIP). IEEE, 2013. http://dx.doi.org/10.1109/icip.2013.6738074.

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Kalantar, S., and U. R. Zimmer. "Scale-adaptive polygonal formations of submersible vehicles and tracking isocontours." In 2008 IEEE/RSJ International Conference on Intelligent Robots and Systems. IEEE, 2008. http://dx.doi.org/10.1109/iros.2008.4650573.

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Gavrovska, A., M. Paskas, V. Kovacevic, and I. Reljin. "Renal DMSA scan morphology analysis using undecimated wavelet transform and isocontours." In TELSIKS 2011 - 2011 10th International Conference on Telecommunication in Modern Satellite, Cable and Broadcasting Services. IEEE, 2011. http://dx.doi.org/10.1109/telsks.2011.6112064.

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Mueller, Stefan P., Frank J. Rybicki, Craig K. Abbey, Stephen C. Moore, and Marie F. Kijewski. "X2 isocontours: predictors of performance in nonlinear estimation tasks at low SNR." In Medical Imaging 1997, edited by Kenneth M. Hanson. SPIE, 1997. http://dx.doi.org/10.1117/12.274107.

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Buchholz, James H. J., Seyed Mohammad Hajimirzaie, and Craig J. Wojcik. "Flow Structure in the Wake of a Wall-Mounted Bluff Body." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30928.

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This paper discusses an experimental study of the flow field around three different wall-mounted obstacles in a boundary layer within a relatively shallow flow (d/H ≈ 4, where d is the flow depth and H is the obstacle height). The first two obstacles consist of a semi-ellipsoidal body with the major axis of the base ellipse oriented in the streamwise and the transverse direction. The third obstacle is a low-aspect-ratio cylinder, bearing greater similarity to geometries investigated in other studies. Reynolds numbers of 5500 and 17800, based on obstacle height, were investigated. Digital particle image velocimetry was used to characterize the flow field in each case. At ReH = 17800, isocontours of streamwise vorticity reveal the presence of a tip vortex pair and a base vortex pair for each geometry; however, the ratio of the relative strengths of the tip and base vortices varies considerably, with the streamwise-oriented ellipsoid having the largest ratio of tip/base vortex circulation and the transverse ellipsoid having the smallest ratio. The presence of a base vortex for such low-aspect-ratio obstacles is unexpected, and therefore we hypothesize that its existence is related to the small d/H. It is anticipated that variation of geometry and d/H will help to elucidate the role of the base vortex in the three-dimensional vortex structure of the wake.

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