Lidé
Ing. Petr Felkel, Ph.D.
Všechny publikace
Singlet Fission Rate: Optimized Packing of a Molecular Pair. Ethylene as a Model
- Autoři: Zaykov, A., Ing. Petr Felkel, Ph.D., Buchanan, E.A., Jovanovic, M., Havenith, R.W.A., Kathir, R.K., Broer, R., Havlas, Z., Michl, J.
- Publikace: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. 2019, 141(44), 17729-17743. ISSN 0002-7863.
- Rok: 2019
- DOI: 10.1021/jacs.9b08173
- Odkaz: https://doi.org/10.1021/jacs.9b08173
- Pracoviště: Katedra počítačové grafiky a interakce
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Anotace:
A procedure is described for unbiased identification of all π-electron chromophore pair geometry choices that locally maximize the rate of conversion of a singlet exciton into singlet biexciton (triplet pair), using a simplified version of the diabatic frontier orbital model of singlet fission (SF). The resulting approximate optimal geometries provide insight and are expected to represent useful starting points for searches by more advanced methods. The general procedure is illustrated on a pair of ethylenes as the simplest model of a π-electron system, but it is applicable to pairs of much larger molecules, with dozens of non-hydrogen atoms, and not necessarily planar. We first examine the value of |TA|², the square of the electronic matrix element for SF with initial excitation fully localized on partner A, on a grid of several billion geometries within the six-dimensional space of physically realizable possibilities. The optimized pair geometries are found to follow the qualitative guidance proposed earlier. In the neighborhood of each local maximum of |TA|², consideration of mixing with charge-transfer configurations and of excitonic interaction between partners A and B determines the SF energy balance and yields squared matrix elements |T*|² and |T**|² for the lower and upper excitonic states S* and S**, respectively. Assuming Boltzmann populations of these states, the geometry is further optimized to maximize k, the sum of the SF rates obtained from Marcus theory, and this reorders the suitable geometries substantially. At 87 pair geometries, the |T*|² and |T**|² values are compared with those obtained from high-level ab initio non-orthogonal configuration interaction calculations and found to follow the same trend. Finally, the biexciton binding energy at the optimized geometries is calculated. ...
I3T: Using Interactive Computer Graphics to Teach Geometric Transformations.
- Autoři: Ing. Petr Felkel, Ph.D., Magana, A.J., Folta, M., Sears, A.G., Benes, B.
- Publikace: EG 2018 - Education Papers. Heraklion: The Eurographics Association, 2018. p. 1-8. ISSN 1017-4656.
- Rok: 2018
- DOI: 10.2312/eged.20181000
- Odkaz: https://doi.org/10.2312/eged.20181000
- Pracoviště: Katedra počítačové grafiky a interakce
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Anotace:
Geometric transformations play an important role in a vast variety of disciplines. Although they belong to the fundamental concepts, they are also difficult to comprehend. Thousands of students take courses of algebra every year and although they may conceptually understand the transformations and mechanically solve the presented problems, they often struggle in visualizing the effect of the transformation on 3D objects represented as matrices. We explored the hypothesis that using interactive 3D computer graphics to visualize the transformations has its learning benefit.We have developed a novel framework for interactive 3D transformations called Interactive 3D Transformations (I3T) that allows for exploring and visualizing immediate effect of 3D transformations on rigid objects. We tested nine graduate students with I3T and compared them with the control group of another nine participants that used traditional passive methods. Moreover, we have tested the students spatial abilities by using a standardized test and we have evaluated how this affects their ability to comprehend the 3D transformations. Overall results showed that students increased their understanding of transformations between the pretest and posttest in both groups. When comparing the two groups, although the mean score in the posttest was two times higher for the I3T group, it did not show that this was statistically significantly higher than for the Traditional Group. The written responses showed higher enthusiasm of the students who used the interactive tool as opposed to using the passive learning method.
Normal based visualization of the virtually machined surface for capturing the impact of machine tool complex dynamic properties
- Autoři: Sulitka, M., Veselý, J., Linkeová, I., Ing. Petr Felkel, Ph.D.,
- Publikace: Innovation in Machining 2012. Guipúzcoa: Centro Tecnológico Tekniker, 2012, pp. 1-6. ISBN 978-84-932064-6-8.
- Rok: 2012
- Pracoviště: Katedra počítačové grafiky a interakce
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Anotace:
In this study, a new method for visualization of a virtually machined surface based on construction of a field of straight lines perpendicular to the machined surface is presented. The method is introduced in connection with the machine tool virtual model. The qualitative verification of the virtual machining results is performed and the precision of the model with the real machined surface is compared.
GamLab - A Development Environment for Simple Games and Four Specific Scenarios for Visually Impaired Children
- Autoři: Ing. Petr Felkel, Ph.D.,
- Publikace: Workshop 2011,CTU Student Grant Competition in 2010 (SGS 2010). Praha: ČVTVS, 2011. pp. 1-3.
- Rok: 2011
- Pracoviště: Katedra počítačové grafiky a interakce
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Anotace:
Computer programs devoted to visually impaired children are rare in the Czech Republic. Therefore, we started a project supporting the developers of such programs by a 2D game development environment. This environment allows drag-and-drop scene modeling, physics simulation, and script programming. We started with reviews of scripting languages and physics libraries. Based on the evaluation of speed and clarity of syntax, we selected the "Boo" scripting language. Based on computational stability and usability in the .NET Framework, C#, and Silverlight environments, we have chosen "Farseer Physics". We have demonstrated our tool by development of the educational program "Discovering with Louisa"; an educational program for visually impaired children, created in the frame of a joint project with the Charles University in Prague.
Poznávejte s Luisou - výukový program pro děti se zrakovým postižením
- Autoři: Ing. Petr Felkel, Ph.D., Holá, KI, Šumníková, P.
- Publikace: Inkluzivní vzdělávání žáků se zdravotním postižením v základní škole. Brno: Pedagogická fakulta Masarykovy univerzity, 2011. pp. 58-69. ISBN 978-80-7315-215-4.
- Rok: 2011
- Pracoviště: Katedra počítačové grafiky a interakce
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Anotace:
Pro intaktní děti existuje celá řada výukových počítačových programů různých témat. Některé z nich jsou využitelné i pro děti s postižením zraku s pomocí reedukačních pomůcek. Specializovaných programů pro předškolní a mladší školní děti se zrakovým postižením je na českém trhu minimum. Proto jsme se rozhodli využít prostředí pro tvorbu her, vyvinuté na fakultě elektrotechnické ČVUT, a vytvořit v něm čtyři ukázkové scénáře. V rámci tématu "poznávání zvířat" se v nich děti učí, jak různá zvířata vypadají, jaké vydávají zvuky, jaké zanechávají stopy a v jakém prostředí žijí. Zároveň program slouží nenásilnou formou k reedukaci zraku. Program jsme podrobili uživatelským testům s předškolními dětmi s poškozením zraku. Děti si po počátečním váhání ovládání rychle osvojily. Proto plánujeme pokračovat ve vývoji dalších scénářů.
Survey of Errors in Surface Representation and their Detection and Correction
- Autoři: Veleba, D., Ing. Petr Felkel, Ph.D.,
- Publikace: WSCG'2007 Short Communications Proceedings. Plzeň: Západočeská universita, 2007. pp. 65-72. ISBN 978-80-86943-02-2.
- Rok: 2007
- Pracoviště: Katedra počítačů
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Anotace:
In this paper, a survey on the most typical mesh errors is given. Each error is described in detail, it is illustrated on an example and surface based techniques for its detection and correction are presented. Covered errors include cracks, holes, T-joints, overlaps, zero volume parts, duplicated geometry, self intersections, inconsistent normal orientation, invisible polygons, degenerate faces and concavities. We consider the separation of the detection and the correction phases advantageous as it gives the user a better control over the mesh correction process, allowing better corrected meshes without introducing new errors, simplifications, or deformations.
Moderní počítačová grafika
- Autoři: prof. Ing. Jiří Žára, CSc., Beneš, B., Sochor, J., Ing. Petr Felkel, Ph.D.,
- Publikace: 2 ed. Brno: Computer Press, 2005. ISBN 80-251-0454-0.
- Rok: 2005
- Pracoviště: Katedra počítačů
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Anotace:
Neoficiální VŠ učebnice počítačové grafiky v Česku a na Slovensku. Obsahuje široký a ucelený průřez moderními metodami rovinné a prostorové počítačové grafiky.
Geometric Methods for Vessel Visualization and Quantification - A Survey
- Autoři: Bühler, K., Ing. Petr Felkel, Ph.D., La Cruz, A.
- Publikace: Geometric Modeling for Scientific Visualization. Berlin: Springer, 2004. p. 399-420. ISBN 3-540-40116-4.
- Rok: 2004
- Pracoviště: Katedra počítačů
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Anotace:
Visualization and quantitative analysis of vessel data is an important preprocessing step in diagnosis of vascular diseases, monitoring, surgery planning, blood flow simulation, education and training of surgeons. This paper surveys several geometric methods to solve basic visualization and quantification problems like centerline computation, boundary detection, projection techniques, and geometric model generation.
Surface Models of Tube Trees
- Autoři: Ing. Petr Felkel, Ph.D., Wegenkittl, R., Buehler, K.
- Publikace: Computer Graphics International (CGI'04). Los Alamitos: IEEE Computer Society, 2004. p. 70-77. ISSN 1530-1052. ISBN 0-7695-2171-1.
- Rok: 2004
- DOI: 10.1109/CGI.2004.1309194
- Odkaz: https://doi.org/10.1109/CGI.2004.1309194
- Pracoviště: Katedra počítačů
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Anotace:
A new method for generating surfaces of branching tubular structures with given centerlines and radii. As the centerlines are not straight lines, the cross-sections are not parallel and well-known algorithms for surface tiling from parallel cross-sections cannot be used. The proposed method tiles non-parallel circular cross-sections and constructs a topologically-correct surface mesh. The method is not artifact-free, but it is fast and simple. The surface mesh serves as a data representation of a vessel tree suitable for real-time Virtual Reality operation planning and operation support within a medical application. Proposed method extracts a "classical" polygonal representation, which can be used in common surface-oriented graphic accelerators.
A Fully Automatic Stitching of 2D Medical Data Sets
- Autoři: Čapek, M., Wegenkittl, R., Ing. Petr Felkel, Ph.D.,
- Publikace: Analysis of Biomedical Signals and Images. Brno: VUTIUM Press, 2002. p. 326-328. ISSN 1211-412X. ISBN 80-214-2120-7.
- Rok: 2002
- Pracoviště: Katedra počítačů
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Anotace:
Image stitching is a prerequisite for obtaining a high resolution image if scanned parts of an image are too large to fit on a scanner. The proposed stitching is based on combination of two approaches used in image registration: on matching sets of external markers and on similarity evaluation of overlaps of neighboring
Christmas Tree Case Study: Computed Tomography as a Tool for Mastering Complex Real World Objects with Applications in Computer Graphics
- Autoři: Kanitsar, A., Theußl, T., Mroz, L., Šrámek, M., Vilanova Bartrolí, A., Csébfalvi, B., Hladuvka, J., Fleischmann, D., Knapp, M., Wegenkittl, R., Ing. Petr Felkel, Ph.D., Röttger, S., Guthe, S., Purgathofer, W., Gröller, M.E.
- Publikace: VIS 2002 IEEE Visualization 2002 Proceedings. Boston: IEEE, 2002. p. 489-492. ISBN 0-7803-7498-3.
- Rok: 2002
- Pracoviště: Katedra počítačů
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Anotace:
We report on using computed tomography (CT) as a model acquisition tool for complex objects in computer graphics. Unlike other modeling and scanning techniques the complexity of the object is irrelevant in CT, which naturally enables to model objects with, for example, concavities, holes, twists or fine surface details. Once the data is scanned, one can apply post-processing techniques for data enhancement, modification or presentation. For demonstration purposes we chose to scan a Christmas tree which exhibits high complexity which is difficult or even impossible to handle with other techniques. However, care has to be taken to achieve good scanning results with CT. Further, we illustrate post-processing by means of data segmentation and photorealistic as well as non-photorealistic surface and volume rendering techniques.
CPR - Curved Planar Reformation
- Autoři: Kanitsar, A., Fleischmann, D., Wegenkittl, R., Ing. Petr Felkel, Ph.D., Gröller, E.
- Publikace: VIS 2002 IEEE Visualization 2002 Proceedings. Boston: IEEE, 2002. p. 37-44. ISBN 0-7803-7498-3.
- Rok: 2002
- Pracoviště: Katedra počítačů
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Anotace:
Visualization of tubular structures such as blood vessels is an important topic in medical imaging. One way to display tubular structures for diagnostic purposes is to generate longitudinal, cross-sections in order to show their lumen, wall, and surrounding tissue in a curved plane. This process is called Curved Planar Reformation (CPR). We present three different methods to generate CPR images. A tube-phantom was scanned with Computed Tomography (CT) to illustrate the properties of the different CPR methods. Furthermore we introduce enhancements to these methods: thick-CPR, rotating-CPR and multi-path-CPR.
Surface Reconstruction of the Branching Vessels for Augmented Reality Aided Surgery
- Autoři: Ing. Petr Felkel, Ph.D., Fuhrmann, A., Kanitsar, A., Wegenkittl, R.
- Publikace: Analysis of Biomedical Signals and Images. Brno: VUTIUM Press, 2002, pp. 252-254. ISSN 1211-412X. ISBN 80-214-2120-7.
- Rok: 2002
- Pracoviště: Katedra počítačů
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Anotace:
This paper describes our work on the reconstruction of the complex liver vessel tree. We demonstrate our method for constructing an arbitrary smooth polygonal representation based on subdivision surfaces using vessel centerlines and radii as input.
Automated Vessel Detection at Lower Extremity Multislice CTA
- Autoři: Kanitsar, A., Wegenkittl, R., Ing. Petr Felkel, Ph.D., Sandner, D., Groller, E., Fleischmann, D.
- Publikace: European Radiology. 2001, 11(S1), S236. ISSN 0938-7994.
- Rok: 2001
- Pracoviště: Katedra počítačů
Computed Tomography Angiography: A Case Study of Peripheral Vessel Investigation
- Autoři: Kanitsar, A., Wegenkittl, R., Ing. Petr Felkel, Ph.D., Fleischmann, D., Sandner, D., Groller, E.
- Publikace: Visualization 2001. Piscataway: IEEE, 2001. p. 477-480. ISBN 0-7803-7200-X.
- Rok: 2001
- Pracoviště: Katedra počítačů
Implementation and Complexity of the Watershed-from-Markers Algorithm Computed as a Minimal Cost Forest
- Autoři: Ing. Petr Felkel, Ph.D., Bruckschwaiger, M., Wegenkittl, R.
- Publikace: Computer Graphics Forum. 2001, 20(3), C26-C35. ISSN 0167-7055.
- Rok: 2001
- DOI: 10.1111/1467-8659.00495
- Odkaz: https://doi.org/10.1111/1467-8659.00495
- Pracoviště: Katedra počítačů
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Anotace:
The main goal of this paper is an implementation of the IFT (Imge Foresting Transform) algorithm with a priority queue with buckets and careful timing of this implementation to reach as minimal memory consumption as possible. The paper presents five possible modifications and methods of implementation of the IFT algorithm. All presented implementations keep the time complexity of the standard priority queue with buckets but the best one minimizes the costly memory allocation and needs only 19-45% of memory for typical 3D medical imaging datasets. Memory saving was reached by an IFT algorithm simplification, which stores more elements in temporary structures but these elements are simpler and thus need less memory.
Postprocessing and Visualization of Peripheral {CTA} Data in Clinical Environments
- Autoři: Kanitsar, A., Wegenkittl, R., Ing. Petr Felkel, Ph.D., Fleischmann, D., Sandner, D., Groller, E.
- Publikace: Proceedings of the 5th Central European Seminar on Computer Graphics. Vienna: Institute of Computer Graphics and Algorithms, 2001, pp. 39-48.
- Rok: 2001
- Pracoviště: Katedra počítačů
Segmentation of Vessels in Peripheral CTA Datasets
- Autoři: Ing. Petr Felkel, Ph.D., Wegenkittl, R., Kanitsar, A.
- Publikace: Internet-Journal "Computer Graphics & Geometry". 2001, 3(3),
- Rok: 2001
- Pracoviště: Katedra počítačů
Vessel Tracking in Peripheral CTA Datasets - An Overview
- Autoři: Ing. Petr Felkel, Ph.D., Wegenkittl, R.
- Publikace: Spring Conference on Computer Graphics SCCG 2001. Bratislava: Univerzita Komenského, 2001, pp. 269-278. ISBN 80-223-1606-7.
- Rok: 2001
- Pracoviště: Katedra počítačů
Vessel Tracking in Peripheral CTA Datasets - An Overview
- Autoři: Ing. Petr Felkel, Ph.D., Wegenkittl, R., Kanitsar, A.
- Publikace: Proceedings of the Spring Conference on Computer Graphics. Los Alamitos: IEEE Computer Society Press, 2001. p. 232-239. ISBN 0-7695-1215-1.
- Rok: 2001
- Pracoviště: Katedra počítačů
VolumePro 500 - Grafický akcelerátor pro zobrazování objemových dat
- Autoři: Ing. Petr Felkel, Ph.D.,
- Publikace: Elektrorevue. 2000,(30), 1-12. ISSN 1213-1539.
- Rok: 2000
- Pracoviště: Katedra počítačů
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Anotace:
není
VolumePro 500: Velká (červnová) revoluce
- Autoři: Ing. Petr Felkel, Ph.D.,
- Publikace: Chip. 2000, 10(1), 54-57. ISSN 1210-0684.
- Rok: 2000
- Pracoviště: Katedra počítačů
Comparison of Two Methods for Reconstruction of 3D Objects from Contours
- Autoři: Ing. Petr Felkel, Ph.D., Janáček, J.
- Publikace: WSCG '99. Plzeň: Západočeská universita, 1999, pp. 375-380. ISBN 80-7082-495-6.
- Rok: 1999
- Pracoviště: Katedra počítačů
Improved Algorithm for 3D Surface Tiling
- Autoři: Ing. Petr Felkel, Ph.D.,
- Publikace: Proceedings of Workshop 99. Praha: České vysoké učení technické v Praze, 1999, pp. 166.
- Rok: 1999
- Pracoviště: Katedra počítačů
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Anotace:
Vylepseny algoritmus oplastovani povrchu
Improvement of Oliva's Algorithm for Surface Reconstruction from Contours
- Autoři: Ing. Petr Felkel, Ph.D., Ing. Štěpán Obdržálek, Ph.D.,
- Publikace: Spring Conference on Computer Graphics, SCCG'99. Bratislava: Univerzita Komenského, 1999. p. 254-263. ISBN 80-223-1357-2.
- Rok: 1999
- Pracoviště: Katedra počítačů
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Anotace:
Oliva proposed an interesting algorithm for a 3D surface reconstruction from contours in parallel crosssections. As stated in the article [9], the algorithm constructs the surface for any non-self-intersecting contour shape also with holes [9] by means of adding appropriate number of intermediate cross-sections between complicated contours and triangulation of every pair of contours in different slices separately. For this task a Straight skeleton (Angular Bisector Network) [1, 9] is exploited. We have implemented Oliva's algorithm and we have found cases, which are not handled properly. The resulting surface can contain overhangs and selfintersected triangles can occur. We propose a modification of a triangulation step in Oliva's algorithm which handles differently the cases when overhangs (artifacts looking like folds) can appear and generates an overhang-free surface. By exclusion of overhangs we also prevent the creation of degenerated surface with mutually-intersected triangles.
Remarks to Similarity Based Registration of Medical Image/Volume Data
- Autoři: Čapek, M., Ing. Petr Felkel, Ph.D., Krekule, I.
- Publikace: Proceedings of the BUDAMED'99 - Conference on Medical Engineering. Budapest: Méréstechnikai, Automatizálási és Informatikai Tudományos Egyesület, 1999, pp. 136-137. ISBN 963-8231-91-2.
- Rok: 1999
- Pracoviště: Katedra počítačů
3D Reconstruction from Cross Sections by Means of Contour Tiling
- Autoři: Ing. Petr Felkel, Ph.D.,
- Publikace: Workshop 98. Praha: České vysoké učení technické v Praze, 1998, pp. 241-242.
- Rok: 1998
- Pracoviště: Katedra počítačů
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Anotace:
Rekonstrukce prostorových objektů oplášťováním kontur
Moderní počítačová grafika
- Autoři: prof. Ing. Jiří Žára, CSc., Beneš, B., Ing. Petr Felkel, Ph.D.,
- Publikace: Brno: Computer Press, 1998. ISBN 80-7226-049-9.
- Rok: 1998
- Pracoviště: Katedra počítačů
Straight Skeleton Implementation
- Autoři: Ing. Petr Felkel, Ph.D., Ing. Štěpán Obdržálek, Ph.D.,
- Publikace: Proceedings of Spring Conference on Computer Graphics 1998. Bratislava: Univerzita Komenského, 1998. p. 210-218. ISBN 80-223-0837-4.
- Rok: 1998
- Pracoviště: Katedra počítačů
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Anotace:
Straight skeleton (Angular Bisector Network, ABN) of a planar polygon, which can be grasped as a modification of a planar Voronoi diagram without parabolic arcs, has been successfully used by Oliva et al. as a part of a system for three dimensional reconstruction of objects from a given set of 2D contours in parallel cross sections. The algorithm itself is used for the construction of intermediate contour layers during the reconstruction process, in order not to create self intersected surface triangles or a surface with holes. But Oliva's algorithm is not publicly available and we have not found any other useful code on the net. We have followed our older ideas and implemented our version of straight skeleton. Our algorithm runs in O(nm + n log n) time, where n denotes the total number of polygon vertices and m the number of reflex ones.
Straight Skeleton Implementation
- Autoři: Ing. Petr Felkel, Ph.D., Ing. Štěpán Obdržálek, Ph.D.,
- Publikace: Poster 1998. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 1998, pp. 1-2.
- Rok: 1998
- Pracoviště: Katedra počítačů
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Anotace:
Straight skeleton (Angular Bisector Network, ABN) of a planar polygon, which can be grasped as a modification of a planar Voronoi diagram without parabolic arcs, has been successfully used by Oliva et al. as a part of a system for three dimensional reconstruction of objects from a given set of 2D contours in parallel cross sections. The algorithm itself is used for the construction of intermediate contour layers during the reconstruction process, in order not to create self intersected surface triangles or a surface with holes. But Oliva's algorithm is not publicly available and we have not found any other useful code on the net. We have followed our older ideas and implemented our version of straight skeleton. Our algorithm runs in O(nm + n log n) time, where n denotes the total number of polygon vertices and m the number of reflex ones.
Analyze - programový nástroj pro vizualizaci medicinských dat
- Autoři: Antoš, K., Ježek, B., Homola, A., Ing. Petr Felkel, Ph.D., Kubínová, L.
- Publikace: Lékař a technika. 1997, 28(6), 127-132. ISSN 0301-5491.
- Rok: 1997
- Pracoviště: Katedra počítačů
Biomedical Imaging Application of Explorer
- Autoři: Ing. Petr Felkel, Ph.D., Janáček, J.
- Publikace: SCCG 1997 - Company Presentions Posters. Bratislava: Univerzita Komenského, 1997, pp. 19-20.
- Rok: 1997
- Pracoviště: Katedra počítačů
Custom-Made Modules of the Explorer Programme Package for Image/Volume Processing
- Autoři: Ing. Petr Felkel, Ph.D., Janáček, J.
- Publikace: Information Technology Applications in Biomedicine. Piscataway: IEEE, 1997, pp. 90-91. ISBN 0-7803-4318-2.
- Rok: 1997
- Pracoviště: Katedra počítačů
Three Medical Image Segmentation Algorithms
- Autoři: Ing. Petr Felkel, Ph.D., Sýkora, L., prof. Ing. Jiří Žára, CSc.,
- Publikace: Acta Polytechnica. 1997, 37(2), 51-63. ISSN 1210-2709.
- Rok: 1997
- Pracoviště: Katedra počítačů
Human Anatomy and Virtual Reality
- Autoři: Antoš, K., Ježek, B., Homola, A., Ing. Petr Felkel, Ph.D., Prymula, R.
- Publikace: Proceedings of the Second International Conference on the Military Applications of Synthetic Enviroments and Virtual Reality. Stockholm: Švédské ministerstvo armády FWM, 1996. pp. 198-202.
- Rok: 1996
- Pracoviště: Katedra počítačů
Methods for Reconstruction of Three-Diomensional Structures
- Autoři: Antoš, K., Ježek, B., Homola, A., Kubínová, L., Ing. Petr Felkel, Ph.D.,
- Publikace: Acta Veterinaria Brno. 1996,(65), 237-245. ISSN 0001-7213.
- Rok: 1996
- Pracoviště: Katedra počítačů
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Anotace:
Segmentation forms the crucial step of Magnetic Resonance (MR) data visualization. The aim of our article is to present two fundamental methods for segmentation of medical data acquired by MR scanners. After a short overview of rendering techniques the appropriate segmentation step for each of them is discussed. Firstly, we describe a segmentation algorithm suitable for surface rendering. We present a model of object shape and appearance, and how how to match the model to the actual image data. Genetic algorithms perform the initial, rough estimation and the position is then refined by a gradient method. We demonstrate the functionality of a simple, one-level model, as well as that of a multiple resolution extended model. Secondly, an algorithm suitable for volume rendering is discussed. It is based on combined model which stores not only grey level and gradient information, but takes into account also adjacency of organs and their hierarchical partitioning.
On Segmentation for Medical Data Visualization
- Autoři: Ing. Petr Felkel, Ph.D., Mrázek, P., Sýkora, P., prof. Ing. Jiří Žára, CSc., Ježek, B.
- Publikace: 7th Eurographics Workshop on Visualization in Scientific Computing. Praha: ČVUT FEL, Katedra počítačů, 1996, pp. 189-198.
- Rok: 1996
- Pracoviště: Katedra počítačů
Systémy pro vizualizaci dat
- Autoři: Ing. Petr Felkel, Ph.D., prof. Ing. Jiří Žára, CSc.,
- Publikace: Softwarové noviny. 1996, 7(2), 26-30. ISSN 1210-8472.
- Rok: 1996
- Pracoviště: Katedra počítačů
Towards Knowledge Based Segmentation of Brain Structures
- Autoři: Ing. Petr Felkel, Ph.D., prof. Ing. Jiří Žára, CSc., Mrázek, P.
- Publikace: Workshop 96. Praha: České vysoké učení technické v Praze, 1996, pp. 253-254.
- Rok: 1996
- Pracoviště: Katedra počítačů
Model-Based Segmentation of Medical Images
- Autoři: Mrázek, P., Ing. Petr Felkel, Ph.D., Sýkora, L.
- Publikace: Proceedings of 11th Spring Conference on Computer Graphics - SSCG 95. Bratislava: Dom techniky, 1995, pp. 22-31. ISBN 80-233-0344-9.
- Rok: 1995
- Pracoviště: Katedra počítačů
Segmentace a vizualizace dat z MR tomografu
- Autoři: Ing. Petr Felkel, Ph.D., prof. Ing. Jiří Žára, CSc.,
- Publikace: Sborník příspěvků na pracovním setkání "Výuka a výzkum v oblasti biomedicínského inženýrství a biotechnologií na FEL ČVUT v Praze". Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 1995, pp. 62.
- Rok: 1995
- Pracoviště: Katedra počítačů
VirtMed - a Project of 3D Medical Data Processing and Visualization
- Autoři: Ing. Petr Felkel, Ph.D., prof. Ing. Jiří Žára, CSc.,
- Publikace: Workshop 95. Praha: České vysoké učení technické v Praze, 1995, pp. 165-166.
- Rok: 1995
- Pracoviště: Katedra počítačů
STEP Prozessor für AutoCAD (Aus der Grundlage der K2-Tools)
- Autoři: Ing. Petr Felkel, Ph.D., Vatterrott, G.
- Publikace: Computer Graphics Topics. 1994, 2(6), 9. ISSN 0936-2770.
- Rok: 1994
- Pracoviště: Katedra počítačů
The Roof Construction Problem Algorithm
- Autoři: Ing. Petr Felkel, Ph.D., prof. Ing. Jiří Žára, CSc.,
- Publikace: Workshop 93. Praha: České vysoké učení technické v Praze, 1993, pp. 85-86.
- Rok: 1993
- Pracoviště: Katedra počítačů