Daniel Patel

Adjunct senior researcher



    [PDF] [Bibtex]
    @ARTICLE {Natali14Rapid,
    author = "Mattia Natali and Julius Parulek and Daniel Patel",
    title = "Rapid Modelling of Interactive Geological Illustrations with Faults and Compaction",
    journal = "Proceedings of Spring Conference on Computer Graphics (SCCG)",
    year = "2014",
    abstract = "In this paper, we propose new methods for building geological illustrations and animations. We focus on allowing geologists to create their subsurface models by means of sketches, to quickly communicate concepts and ideas rather than detailed information. The result of our sketch-based modelling approach is a layer-cake volume representing geological phenomena, where each layer is rock material which has accumulated due to a user-defined depositional event. Internal geological structures can be inspected by different visualization techniques that we employ. Faulting and compaction of rock layers are important processes in geology. They can be modelled and visualized with our technique. Our representation supports non-planar faults that a user may define by means of sketches. Real-time illustrative animations are achieved by our GPU accelerated approach.",
    pdf = "pdfs/Natali14Rapid.pdf",
    images = "images/Natali2014Rapid0.png, images/Natali2014Rapid1.png",
    thumbnails = "images/Natali2014Rapid0.png, images/Natali2014Rapid1.png",
    url = "http://dx.doi.org/10.1145/2643188.2643201",
    project = "geoillustrator"
    [DOI] [VID] [Bibtex]
    @ARTICLE {Natali14Sketch,
    author = "Mattia Natali and Tore Grane Klausen and Daniel Patel",
    title = "Sketch-Based Modelling and Visualization of Geological Deposition",
    journal = "Computers \& Geosciences",
    year = "2014",
    volume = "67C",
    pages = "40--48",
    abstract = "We propose a method for sketching and visualizing geological models by sequentially defining stratigraphic layers, where each layer represents a unique erosion or deposition event. Evolution of rivers and deltas is important for geologists when interpreting the stratigraphy of the subsurface, in particular for hydrocarbon exploration. We illustratively visualize mountains, basins, lakes, rivers and deltas, and how they change the morphology of a terrain during their evolution. We present a compact representation of the model and a novel rendering algorithm that allows us to obtain an interactive and illustrative layer-cake visualization. A user study has been performed to evaluate our method.",
    vid = "vids/Natali2014Sketch.mp4",
    images = "images/Natali2014Sketch0.png, images/Natali2014Sketch1.png",
    thumbnails = "images/Natali2014Sketch0.png, images/Natali2014Sketch1.png",
    doi = "10.1016/j.cageo.2014.02.010",
    url = "http://www.sciencedirect.com/science/article/pii/S0098300414000508",
    project = "geoillustrator"


    [DOI] [Bibtex]
    @ARTICLE {Lidal13Geological,
    author = "Endre M. Lidal and Mattia Natali and Daniel Patel and Helwig Hauser and Ivan Viola",
    title = "Geological storytelling",
    journal = "Computers \& Graphics",
    year = "2013",
    volume = "37",
    number = "5",
    pages = "445--459 ",
    abstract = "Developing structural geological models from exploratory subsea imaging is difficult and an ill-posed process. The structural geological processes that take place in the subsurface are both complex and time-dependent. We present Geological Storytelling, a novel graphical system for performing rapid and expressive geomodeling. Geologists can convey geological stories that externalize both their model and the reasoning process behind it through our simple, yet expressive sketch-based, flip-over canvases. This rapid modeling interface makes it easy to construct a large variety of geological stories, and our story tree concept facilitates easy management and the exploration of these alternatives. The stories are then animated and the geologists can examine and compare them to identify the most plausible models. Finally, the geological stories can be presented as illustrative animations of automatically synthesized 3D models, which efficiently communicate the complex geological evolution to non-experts and decision makers. Geological storytelling provides a complete pipeline from the ideas and knowledge in the mind of the geologist, through externalized artifacts specialized for discussion and knowledge dissemination among peer-experts, to automatically rendered illustrative 3D animations for communication to lay audience. We have developed geological storytelling in collaboration with domain experts that work with the modeling challenges on a daily basis. For evaluation, we have developed a geological storytelling prototype and presented it to experts and academics from the geosciences. In their feedback, they acknowledge that the rapid and expressive sketching of stories can make them explore more alternatives and that the 3D illustrative animations assist in communicating their models.",
    images = "images/Lidal13Geological01.jpg, images/Lidal13Geological02.png",
    thumbnails = "images/Lidal13Geological01.jpg, images/Lidal13Geological02.png",
    issn = "0097-8493",
    doi = "http://dx.doi.org/10.1016/j.cag.2013.01.010",
    url = "http://www.sciencedirect.com/science/article/pii/S0097849313000125",
    keywords = "Sketch-based modeling; Externalization of mental processes; Storytelling; 3D model synthesis; Animation; Alternatives exploration; Geology; Structural geological models",
    project = "geoillustrator"
    [PDF] [DOI] [Bibtex]
    @INPROCEEDINGS {Natali13Modeling,
    author = "Mattia Natali and Endre M. Lidal and Julius Parulek and Ivan Viola and Daniel Patel",
    title = "Modeling Terrains and Subsurface Geology",
    booktitle = "EuroGraphics 2013 State of the Art Reports (STARs)",
    year = "2013",
    pages = "155--173",
    abstract = "The process of creating terrain and landscape models is important in a variety of computer graphics and visualization applications, from films and computer games, via flight simulators and landscape planning, to scientific visualization and subsurface modelling. Interestingly, the modelling techniques used in this large range of application areas have started to meet in the last years. In this state-of-the-art report, we present two taxonomies of different modelling methods. Firstly we present a data oriented taxonomy, where we divide modelling into three different scenarios: the data-free, the sparse-data and the dense-data scenario. Then we present a workflow oriented taxonomy, where we divide modelling into the separate stages necessary for creating a geological model. We start the report by showing that the new trends in geological modelling are approaching the modelling methods that have been developed in computer graphics. We then give an introduction to the process of geological modelling followed by our two taxonomies with descriptions and comparisons of selected methods. Finally we discuss the challenges and trends in geological modelling.",
    pdf = "pdfs/Natali13Modeling.pdf",
    images = "images/Natali13Modeling.png",
    thumbnails = "images/Natali13Modeling.png",
    proceedings = "EuroGraphics 2013 State of the Art Reports (STARs)",
    url = "http://diglib.eg.org/EG/DL/conf/EG2013/stars/155-173.pdf",
    doi = "10.2312/conf/EG2013/stars/155-173",
    location = "Girona, Spain",
    project = "geoillustrator"
    [PDF] [DOI] [YT] [Bibtex]
    @ARTICLE {Patel-2013-ICS,
    author = "Daniel Patel and Veronika \v{S}olt{\'e}szov{\'a} and Jan Martin Nordbotten and Stefan Bruckner",
    title = "Instant Convolution Shadows for Volumetric Detail Mapping",
    journal = "ACM Transactions on Graphics",
    year = "2013",
    volume = "32",
    number = "5",
    pages = "154:1--154:18",
    month = "sep",
    abstract = "In this article, we present a method for rendering dynamic scenes  featuring translucent procedural volumetric detail with all-frequency  soft shadows being cast from objects residing inside the view frustum.  Our approach is based on an approximation of physically correct shadows  from distant Gaussian area light sources positioned behind the view  plane, using iterative convolution. We present a theoretical and  empirical analysis of this model and propose an efficient class of  convolution kernels which provide high quality at interactive frame  rates. Our GPU-based implementation supports arbitrary volumetric  detail maps, requires no precomputation, and therefore allows for  real-time modi?cation of all rendering parameters.",
    pdf = "pdfs/Patel-2013-ICS.pdf",
    images = "images/Patel-2013-ICS.jpg",
    thumbnails = "images/Patel-2013-ICS.png",
    youtube = "https://www.youtube.com/watch?v=lhGWgew3HXY,https://www.youtube.com/watch?v=XrhYjgQxfb0",
    doi = "10.1145/2492684",
    keywords = "shadows, volumetric effects, procedural texturing, filtering",
    project = "geoillustrator",
    url = "http://dl.acm.org/citation.cfm?id=2492684"
    [PDF] [Bibtex]
    @INPROCEEDINGS {Lidal13Rapid,
    author = "Endre Lidal and Daniel Patel and Morten Bendiksen and Tor Langeland and Ivan Viola",
    title = "Rapid Sketch-based 3D Modeling of Geology",
    booktitle = "Proceedings of EnvirVis Short Papers 2013",
    year = "2013",
    abstract = "We present and compare two different approaches for performing rapid 3D geological modeling. The ad-hoc approach is based on a composition of many specialized modeling functions, while the generic approach provides one powerful, generic modeling function. Our experiences after developing these two approaches are that the solution space of 3D geological modeling is more extensive than we initially expected and most likely larger than for other modeling domains such as architecture. Further, more research is needed to investigate whether it is possible to �nd one well de�ned toolset of sketching metaphors that is able to cover all of geological modeling.",
    pdf = "pdfs/Lidal13Rapid.pdf",
    images = "images/Lidal13Rapid01.png",
    thumbnails = "images/Lidal13Rapid01_thumb.png",
    project = "geoillustrator"


    [PDF] [VID] [Bibtex]
    @INPROCEEDINGS {Solteszova12Stylized,
    author = "Veronika \v{S}olt{\'e}szov{\'a} and Ruben Patel and Helwig Hauser and Ivanko Viola",
    title = "Stylized Volume Visualization of Streamed Sonar Data",
    booktitle = "Proceedings of Spring Conference on Computer Graphics (SCCG 2012)",
    year = "2012",
    pages = "13--20",
    month = "May",
    abstract = "Current visualization technology implemented in the software for 2D sonars used in marine research is limited to slicing whilst volume visualization is only possible as post processing. We designed and implemented a system which allows for instantaneous volume visualization of streamed scans from 2D sonars without prior resampling to a voxel grid. The volume is formed by a set of most recent scans which are being stored. We transform each scan using its associated transformations to the view-space and slice their bounding box by view-aligned planes. Each slicing plane is reconstructed from the underlying scans and directly used for slice-based volume rendering. We integrated a low frequency illumination model which enhances the depth perception of noisy acoustic measurements. While we visualize the 2D data and time as 3D volumes, the temporal dimension is not intuitively communicated. Therefore, we introduce a concept of temporal outlines. Our system is a result of an interdisciplinary collaboration between visualization and marine scientists. The application of our system was evaluated by independent domain experts who were not involved in the design process in order to determine real life applicability.",
    pdf = "pdfs/Solteszova12Stylized.pdf",
    vid = "vids/Solteszova12Stylized.mp4",
    images = "images/Solteszova12Stylized01.png, images/Solteszova12Stylized02.png, images/Solteszova12Stylized03.png",
    thumbnails = "images/Solteszova12Stylized01_thumb.png, images/Solteszova12Stylized02_thumb.png, images/Solteszova12Stylized03_thumb.png",
    note = "Second best paper and second best presentation awards",
    location = "Smolenice castle, Slovakia",
    project = "illustrasound,medviz,illvis"
    [DOI] [Bibtex]
    @INPROCEEDINGS {Natali12Rapid,
    author = "Mattia Natali and Ivan Viola and Daniel Patel",
    title = "Rapid Visualization of Geological Concepts",
    booktitle = "SIBGRAPI 2012 (XXV Conference on Graphics, Patterns and Images)",
    year = "2012",
    editor = "C. Freitas, L. Silva, R. Scopigno, and S. Sarkar",
    address = "Ouro Preto, MG, Brazil",
    month = "August",
    abstract = "We describe a sketch-based system for constructing an illustrative visualization of the subsurface. An intuitive and rapid modelling tool is defined, which takes as input user's strokes and creates a 3D layer-cake model of the earth. Our tool enables users to quickly express and communicate their ideas directly using a 3D model. For sketching, we have created geometric operators that capture the domain specific modelling requirements.We have devised sketching operators for expressing folding and faulting processes. This makes it possible to produce a large span of scenarios. Moreover, for communicating layer properties such as rock type and grain size, our system allows for associating user defined texture to each layer which can be deformed with a few sketch strokes.",
    images = "images/Natali12Rapid01.png, images/Natali12Rapid02.png",
    thumbnails = "images/Natali12Rapid01_thumb.png, images/Natali12Rapid02_thumb.png",
    url = "http://www.decom.ufop.br/sibgrapi2012/",
    doi = "10.1109/SIBGRAPI.2012.29",
    project = "geoillustrator"


    @INPROCEEDINGS {solteszova11chromatic,
    author = "Veronika \v{S}olt{\'e}szov{\'a} and Daniel Patel and Ivan Viola",
    title = "Chromatic Shadows for Improved Perception",
    booktitle = "Proc. Non-photorealistic Animation and Rendering (NPAR 2011)",
    year = "2011",
    pages = "105--115",
    abstract = "Soft shadows are effective depth and shape cues. However, traditional shadowing algorithms decrease the luminance in shadowareas. The features in shadow become dark and thus shadowing causesinformation hiding. For this reason, in shadowed areas, medical illustrators decrease the luminance less and compensate the lower luminance range by adding color, i.e., by introducing a chromatic component. This paper presents a novel technique which enables an interactive setup of an illustrative shadow representation for preventing overdarkening of important structures. We introduce a scalar attribute for every voxel denoted as shadowiness and propose a shadow transfer function that maps the shadowiness to a color and a blend factor. Typically, the blend factor increases linearly with the shadowiness. We then let the original object color blend with the shadow color according to the blend factor. We suggest a specific shadow transfer function, designed together with a medical illustrator which shifts the shadow color towards blue. This shadow transfer function is quantitatively evaluated with respect to relative depth and surface perception.",
    images = "images/solteszova11chromatic3.jpg, images/solteszova11chromatic2.jpg, images/solteszova11chromatic.jpg, images/solteszova11chromatic4.jpg",
    thumbnails = "images/solteszova11chromatic3_thumb.jpg, images/solteszova11chromatic2_thumb.jpg, images/solteszova11chromatic_thumb.jpg, images/solteszova11chromatic4_thumb.jpg",
    location = "Vancouver, Canada",
    url = "http://dx.doi.org/10.1145/2024676.2024694",
    project = "illustrasound,medviz,illvis"
    [PDF] [Bibtex]
    @INPROCEEDINGS {Patel-2011-PEA,
    author = "Daniel Patel and Meister Eduard Gr{\"o}ller and Stefan Bruckner",
    title = "PhD Education Through Apprenticeship",
    booktitle = "Proceedings of Eurographics 2011 (Education Papers)",
    year = "2011",
    editor = "S. Maddock, J. Jorge",
    pages = "23--28",
    month = "apr",
    abstract = "We describe and analyze the PhD education in the visualization group  at the Vienna University of Technology and set the education in a  larger perspective. Four central mechanisms drive the PhD education  in Vienna. They are: to require an article-based PhD; to give the  student freedom to choose research direction; to let students work  in shared offices towards joint deadlines; and to involve students  in reviewing articles. This paper describes these mechanisms in detail  and illustrates their effect.",
    pdf = "pdfs/Patel-2011-PEA.pdf",
    images = "images/Patel-2011-PEA.jpg",
    thumbnails = "images/Patel-2011-PEA.png",
    keywords = "M., education, visualization, apprenticeship",
    location = "Llandudno, United Kingdom",
    url = "http://www.cg.tuwien.ac.at/research/publications/2011/patel-2011-PEA/"


    [PDF] [DOI] [YT] [Bibtex]
    @INPROCEEDINGS {Patel-2010-SVV,
    author = "Daniel Patel and Stefan Bruckner and Ivan Viola and Meister Eduard Gr{\"o}ller",
    title = "Seismic Volume Visualization for Horizon Extraction",
    booktitle = "Proceedings of IEEE Pacific Visualization 2010",
    year = "2010",
    pages = "73--80",
    month = "mar",
    abstract = "Seismic horizons indicate change in rock properties and are central  in geoscience interpretation. Traditional interpretation systems  involve time consuming and repetitive manual volumetric seeding for  horizon growing. We present a novel system for rapidly interpreting  and visualizing seismic volumetric data. First we extract horizon  surface-parts by preprocessing the seismic data. Then during interaction  the user can assemble in realtime the horizon parts into horizons.  Traditional interpretation systems use gradient-based illumination  models in the rendering of the seismic volume and polygon rendering  of horizon surfaces. We employ realtime gradientfree forward-scattering  in the rendering of seismic volumes yielding results similar to high-quality  global illumination. We use an implicit surface representation of  horizons allowing for a seamless integration of horizon rendering  and volume rendering. We present a collection of novel techniques  constituting an interpretation and visualization system highly tailored  to seismic data interpretation.",
    pdf = "pdfs/Patel-2010-SVV.pdf",
    images = "images/Patel-2010-SVV.jpg",
    thumbnails = "images/Patel-2010-SVV.png",
    youtube = "https://www.youtube.com/watch?v=YXg4LZsTQdc",
    doi = "10.1109/PACIFICVIS.2010.5429605",
    keywords = "volume visualization, horizon extraction, seismic data",
    location = "Taipei, Taiwan",
    project = "geoillustrator,illvis",
    url = "http://www.cg.tuwien.ac.at/research/publications/2010/patel-2010-SVV/"
    [PDF] [DOI] [YT] [Bibtex]
    @INPROCEEDINGS {Haidacher-2010-VVS,
    author = "Martin Haidacher and Daniel Patel and Stefan Bruckner and Armin Kanitsar and Meister Eduard Gr{\"o}ller",
    title = "Volume Visualization based on Statistical Transfer-Function Spaces",
    booktitle = "Proceedings of IEEE Pacific Visualization 2010",
    year = "2010",
    pages = "17--24",
    month = "mar",
    abstract = "It is a difficult task to design transfer functions for noisy data.  In traditional transfer-function spaces, data values of different  materials overlap. In this paper we introduce a novel statistical  transfer-function space which in the presence of noise, separates  different materials in volume data sets. Our method adaptively estimates  statistical properties, i.e. the mean value and the standard deviation,  of the data values in the neighborhood of each sample point. These  properties are used to define a transfer-function space which enables  the distinction of different materials. Additionally, we present  a novel approach for interacting with our new transfer-function space  which enables the design of transfer functions based on statistical  properties. Furthermore, we demonstrate that statistical information  can be applied to enhance visual appearance in the rendering process.  We compare the new method with 1D, 2D, and LH transfer functions  to demonstrate its usefulness.",
    pdf = "pdfs/Haidacher-2010-VVS.pdf",
    images = "images/Haidacher-2010-VVS.jpg",
    thumbnails = "images/Haidacher-2010-VVS.png",
    youtube = "https://www.youtube.com/watch?v=firkkbHdZ5o",
    doi = "10.1109/PACIFICVIS.2010.5429615",
    keywords = "transfer function, statistics, shading, noisy data, classification",
    location = "Taipei, Taiwan",
    url = "http://www.cg.tuwien.ac.at/research/publications/2010/haidacher_2010_statTF/"
    [PDF] [DOI] [YT] [Bibtex]
    @ARTICLE {Solteszova-2010-MOS,
    author = "Veronika \v{S}olt{\'e}szov{\'a} and Daniel Patel and Stefan Bruckner and Ivan Viola",
    title = "A Multidirectional Occlusion Shading Model for Direct Volume Rendering",
    journal = "Computer Graphics Forum",
    year = "2010",
    volume = "29",
    number = "3",
    pages = "883--891",
    month = "jun",
    abstract = "In this paper, we present a novel technique which simulates directional  light scattering for more realistic interactive visualization of  volume data. Our method extends the recent directional occlusion  shading model by enabling light source positioning with practically  no performance penalty. Light transport is approximated using a tilted  cone-shaped function which leaves elliptic footprints in the opacity  buffer during slice-based volume rendering. We perform an incremental  blurring operation on the opacity buffer for each slice in front-to-back  order. This buffer is then used to define the degree of occlusion  for the subsequent slice. Our method is capable of generating high-quality  soft shadowing effects, allows interactive modification of all illumination  and rendering parameters, and requires no pre-computation.",
    pdf = "pdfs/Solteszova-2010-MOS.pdf",
    images = "images/Solteszova-2010-MOS.jpg",
    thumbnails = "images/Solteszova-2010-MOS.png",
    youtube = "https://www.youtube.com/watch?v=V4y0BVKV_bw",
    doi = "10.1111/j.1467-8659.2009.01695.x",
    event = "EuroVis 2010",
    keywords = "global illumination, volume rendering, shadows, optical model",
    location = "Bordeaux, France",
    project = "illustrasound,medviz,illvis",
    url = "http://www.cg.tuwien.ac.at/research/publications/2010/solteszova-2010-MOS/"


    @ARTICLE {patel09knowledge,
    author = "Daniel Patel and {\O }yvind Sture and Helwig Hauser and Christopher Giertsen and Meister Eduard Gr{\"o}ller",
    title = "Knowledge-assisted visualization of seismic data",
    journal = "Computers \& Graphics",
    year = "2009",
    volume = "33",
    number = "5",
    pages = "585--596",
    abstract = "We present novel techniques for knowledge-assisted annotation and computer-assisted interpretation of seismic data for oil and gas exploration. We describe the existing procedure for oil and gas search which consists of manually extracting information from seismic data and then aggregating it into knowledge in a detail-oriented bottom-up approach. We then point out the weaknesses of this approach and propose how to improve on it by introducing a holistic computer-assisted top-down approach intended as a preparation step enabling a quicker, more focused and accurate bottom-up interpretation. The top-down approach also enables early representations of hypotheses and knowledge using domain-specific textures for annotating the data. Finally we discuss how these annotations can be extended to 3D for volumetric annotations.",
    images = "images/patel09knowledge2.jpg, images/patel09knowledge1.jpg, images/patel09knowledge3.jpg, images/patel09knowledge4.jpg",
    thumbnails = "images/patel09knowledge2_thumb.jpg, images/patel09knowledge1_thumb.jpg, images/patel09knowledge3_thumb.jpg, images/patel09knowledge4_thumb.jpg",
    url = "http://dx.doi.org/10.1016/j.cag.2009.06.005"
    @PHDTHESIS {patel09thesis,
    author = "Daniel Patel",
    title = "Expressive Visualization and Rapid Interpretation of Seismic Volumes",
    school = "Department of Informatics, University of Bergen, Norway",
    year = "2009",
    month = "oct",
    abstract = "One of the most important resources in the world today is energy. Oil and gas provide two thirds of the world energy consumption, making the world completely dependent on it. Locating and recovering the remaining oil and gas reserves will be of high focus in society until competitive energy sources are found. The search for hydrocarbons is broadly speaking the topic of this thesis. Seismic measurements of the subsurface are collected to discover oil and gas trapped in the ground. Identifying oil and gas in the seismic measurements requires visualization and interpretation. Visualization is needed to present the data for further analysis. Interpretation is performed to identify important structures. Visualization is again required for presenting these structures to the user. This thesis investigates how computer assistance in producing high-quality visualizations and in interpretation can result in expressive visualization and rapid interpretation of seismic volumes. Expressive visualizations represent the seismic data in an easily digestible, intuitive and pedagogic form. This enables rapid interpretation which accelerates the finding of important structures.",
    images = "images/patel09thesis.jpg, images/patel09thesis1.jpg, images/patel09thesis3.jpg, images/patel09thesis2.jpg",
    thumbnails = "images/patel09thesis_thumb.jpg, images/patel09thesis1_thumb.jpg, images/patel09thesis3_thumb.jpg, images/patel09thesis2_thumb.jpg",
    url = "http://www.cg.tuwien.ac.at/research/publications/2009/patel-2009-evr/",
    project = "illvis"
    @INPROCEEDINGS {patel09momentCurves,
    author = "Daniel Patel and Martin Haidacher and Jean-Paul Balabanian and Meister Eduard Gr{\"o}ller",
    title = "Moment Curves",
    booktitle = "Proceedings of the IEEE Pacific Visualization Symposium 2009",
    year = "2009",
    pages = "201--208",
    month = "April",
    abstract = "We define a transfer function based on the first and second statistical  moments. We consider the evolution of the mean and variance with  respect to a growing neighborhood around a voxel. This evolution  defines a curve in 3D for which we identify important trends and  project it back to 2D. The resulting 2D projection can be brushed  for easy and robust classification of materials and material borders.  The transfer function is applied to both CT and MR data.",
    images = "images/patel09momentCurves1.jpg, images/patel09momentCurves2.jpg",
    thumbnails = "images/patel09momentCurves1_thumb.jpg, images/patel09momentCurves2_thumb.jpg",
    location = "Beijing, China",
    url = "http://www.cg.tuwien.ac.at/research/publications/2009/patel_2009_MC/"


    [VID] [Bibtex]
    @ARTICLE {patel08seismicAnalyzer,
    author = "Daniel Patel and Christopher Giertsen and John Thurmond and John Gjelberg and Meister Eduard Gr{\"o}ller",
    title = "The Seismic Analyzer: Interpreting and Illustrating 2D Seismic Data",
    journal = "IEEE Transactions on Visualization and Computer Graphics (IEEE TVCG)",
    year = "2008",
    volume = "14",
    number = "6",
    pages = "1571--1578",
    month = "Oct",
    abstract = "We present a toolbox for quickly interpreting and illustrating 2D slices of seismic volumetric reflection data. Searching for oil and gas involves creating a structural overview of seismic reflection data to identify hydrocarbon reservoirs. We improve the search of seismic structures by precalculating the horizon structures of the seismic data prior to interpretation. We improve the annotation of seismic structures by applying novel illustrative rendering algorithms tailored to seismic data, such as deformed texturing and line and texture transfer functions. The illustrative rendering results in multi-attribute and scale invariant visualizations where features are represented clearly in both highly zoomed in and zoomed out views. Thumbnail views in combination with interactive appearance control allows for a quick overview of the data before detailed interpretation takes place. These techniques help reduce the work of seismic illustrators and interpreters.",
    vid = "vids/patel08vis.html",
    images = "images/patel08seismic.png, images/patel08seismic4.jpg, images/patel08seismic3.jpg, images/patel08seismic1.png",
    thumbnails = "images/patel08seismic_thumb.png, images/patel08seismic4_thumb.jpg, images/patel08seismic3_thumb.jpg, images/patel08seismic1_thumb.png",
    event = "IEEE Visualization 2008",
    location = "Columbus, Ohio, USA",
    url = "http://dx.doi.org/10.1109/TVCG.2008.170",
    pres = "pdfs/patel08vis-presentation.pdf"


    [PDF] [Bibtex]
    @INPROCEEDINGS {Balabanian2007,
    author = "Jean-Paul Balabanian and Ivan Viola and Egil Ona and Ruben Patel  and Meister Eduard Gr{\"o}ller",
    title = "Sonar Explorer: A New Tool for Visualization of Fish Schools from  {3D} Sonar Data",
    booktitle = "Data Visualization - EuroVis 2007",
    year = "2007",
    editor = "K. Museth and T. M{\"o}ller and A. Ynnerman",
    pages = "155--162",
    month = "may",
    publisher = "Eurographics Association",
    abstract = "We present a novel framework for analysis and visualization of fish  schools in 3D sonar surveys. The 3D sonar technology is new and there  have not been applications to visualize the data in 3D. We have created  an application called Sonar Explorer that satisfies the requirements  of domain scientists. Sonar Explorer provides easy and intuitive  semi-automatic fish school tracking and survey map generation. The  overall pipeline is described and all pipeline stages relevant for  visualization are highlighted. We present techniques to deal with  3D sonar data specifics: highly anisotropic volume data aligned on  a curvilinear grid. Domain scientists provide initial impressions  on interaction and outlook.",
    pdf = "pdfs/Balabanian2007.pdf",
    images = "images/balabanian_2007_eurovis.png",
    thumbnails = "images/balabanian_2007_eurovis_thumb.png",
    isbn = "978-3-905673-45-6",
    location = "Norrk{\"o}ping, Sweden",
    event = "EuroVis 2007"
    [PDF] [Bibtex]
    @INPROCEEDINGS {patel_daniel_2007_IRSD,
    author = "Daniel Patel and Christopher Giertsen and John Thurmond and Meister Eduard Gr{\"o}ller",
    title = "Illustrative Rendering of Seismic Data",
    booktitle = "Proceeding of Vision Modeling and Visualization 2007",
    year = "2007",
    editor = "Hendrik Lensch, Bodo Rosenhahn, H.P. Seidel",
    pages = "13--22",
    month = "nov",
    abstract = "In our work we present techniques for illustrative rendering of interpreted seismic volume data by adopting elements from geology book illustrations. We also introduce combined visualization techniques of interpreted and uninterpreted data for validation, comparison and interdisciplinary communication reasons. We introduce the concept of smooth transitions between these two semantical levels. To achieve this we present transfer functions that map seismic volume attributes to 2D textures that flow according to a deformation volume describing the buckling and discontinuities of the layers of the seismic data.",
    pdf = "pdfs/patel_daniel_2007_IRSD-paper.pdf",
    images = "images/patel_daniel_2007_IRSD-Illustrative%20rendering.png",
    thumbnails = "images/patel_daniel_2007_IRSD-Illustrative%20rendering_thumb.png",
    journal = "Vision, Modelling and Visualization",
    location = "Saarbr{\"u}cken, Germany",
    url = "http://www.cg.tuwien.ac.at/research/publications/2007/patel_daniel_2007_IRSD/"