[ { "id": "Neumann-1997-PBCID", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Perception Based Color Image Difference", "date": "1997-12", "abstract": "A good image metric is often needed in digital image\nsynthesis. It can be used to check the convergence behavior in\nprogressive methods, to compare images rendered using various\nrendering methods etc. Since images are rendered to be observed by\nhumans, an image metric should correspond to human perception as\nwell. We propose here a new algorithm which operates in the original\nimage space. There is no need for Fourier or wavelet\ntransforms. Furthermore, the new metric is view distance\ndependent. The new method uses the contrast sensitivity\nfunction\\cite{[MANN74]}. The main idea is to place a number of various\nrectangles in images, and to compute the CIE LUV average color\ndifference between corresponding rectangles. Errors are then weighted\naccording to the rectangle size and the contrast sensitivity\nfunction.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 235, 190 ], "number": "TR-186-2-97-21", "pages_from": "", "pages_to": "", "research_areas": [], "keywords": [ "image comparisson", "perception based rendering" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Neumann-1997-PBCID-paper.gz", "type": "application/octet-stream", "size": 1122980, "path": "Publication:Neumann-1997-PBCID", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Neumann-1997-PBCID/Neumann-1997-PBCID-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Neumann-1997-PBCID/", "__class": "Publication" }, { "id": "Kopp-1997-MRM", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Multi-Resolution Image Morphing", "date": "1997-10", "abstract": "The proposed technique extends conventional image\nmorphing algorithms by offering additional control over the\nprocessing of the individual multi-resolutions that are used in the\nwavelet representation when moving from the source to the destination\nimage. This gives the animator the possibility to introduce a disparity\nbetween the morphing of global and detail features that can lead to\ninteresting new effects that are not achievable with traditional methods.\nThe calculation of an intermediate image in conventional image\nmorphing algorithms is done in three steps: firstly the determination\nof feature correspondence and of an intermediate feature geometry,\nsecondly the warping of the source and the destination images to\nintermediate images that match the feature geometry, and finally the\nblending of the two warped images. The proposed algorithm alters the\nthird step by making the blending dependent on the multi-resolution\nlevels using a new specialized 2D wavelet transformation.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 413, 190 ], "number": "TR-186-2-97-20", "pages_from": "1", "pages_to": "11", "research_areas": [], "keywords": [ "Animation", "Image Morphing", "Wavelets" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Kopp-1997-MRM-paper.pdf", "type": "application/pdf", "size": 3294069, "path": "Publication:Kopp-1997-MRM", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Kopp-1997-MRM/Kopp-1997-MRM-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Kopp-1997-MRM/", "__class": "Publication" }, { "id": "Fischel-1997-CSVVP", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Case study: Visualizing Various Properties of\n\t\t Dynamical Systems", "date": "1997-09", "abstract": "There is a wide range of visualization techniques for\ndynamical systems. These methods are used to visualize certain\nproperties as, e.g., stability of fixed points, characteristic changes\nof velocity, and bifurcations. This paper gives a short introduction\nto dynamical systems and describes several visualization\ntechniques. Some of those are applied to three different dynamical\nsystems. The application of different visualization methods to\ndynamical systems shows, how scientific visualization can be used for\nanalyzing the behavior of dynamical systems, and how visualization can\n make analysis of a dynamical system fast and efficient.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 416, 212, 184, 399, 166 ], "number": "TR-186-2-97-16", "pages_from": "1", "pages_to": "10", "research_areas": [], "keywords": [ "" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Fischel-1997-CSVVP-paper.gz", "type": "application/octet-stream", "size": 1848646, "path": "Publication:Fischel-1997-CSVVP", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Fischel-1997-CSVVP/Fischel-1997-CSVVP-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Fischel-1997-CSVVP/", "__class": "Publication" }, { "id": "Szalavari-1997-ARECWS", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Augmented Reality Enabled Collaborative Work in 'Studierstube'", "date": "1997-09", "abstract": "We introduce a multi-user augmented reality system to support\ncollaboration of participants in research, presentation and education. Our system\n\"Studierstube\" presents three-dimensional stereoscopic images simultaneously to a\ngroup of users wearing see-through head mounted displays. The displays do not affect\nnatural communication and interaction, making working together very effective. Users see\nthe same spatially aligned model, but can independently control their viewpoint and\n different layers of the data to be displayed.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 234, 249, 204, 202 ], "number": "TR-186-2-97-18", "pages_from": "1", "pages_to": "TR-186-2-97-19Paper.ps.gz", "research_areas": [], "keywords": [ "augmented reality", "multi-user application", "collaboration" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szalavari-1997-ARECWS-paper.gz", "type": "application/octet-stream", "size": 32909, "path": "Publication:Szalavari-1997-ARECWS", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Szalavari-1997-ARECWS/Szalavari-1997-ARECWS-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Szalavari-1997-ARECWS/", "__class": "Publication" }, { "id": "Szalavari-1997-ARECWSX", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Augmented Reality Enabled Collaborative Work in 'Studierstube'", "date": "1997-09", "abstract": "We introduce a multi-user augmented reality system to support\ncollaboration of participants in research, presentation and education. Our system\n\"Studierstube\" presents three-dimensional stereoscopic images simultaneously to a\ngroup of users wearing see-through head mounted displays. The displays do not affect\nnatural communication and interaction, making working together very effective. Users see\nthe same spatially aligned model, but can independently control their viewpoint and\n different layers of the data to be displayed.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 234, 249, 204, 202 ], "number": "TR-186-2-97-18", "pages_from": "1", "pages_to": "2", "research_areas": [], "keywords": [ "augmented reality", "multi-user application", "collaboration" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szalavari-1997-ARECWSX-paper.gz", "type": "application/octet-stream", "size": 32909, "path": "Publication:Szalavari-1997-ARECWSX", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Szalavari-1997-ARECWSX/Szalavari-1997-ARECWSX-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Szalavari-1997-ARECWSX/", "__class": "Publication" }, { "id": "Purgathofer-1997-SNT", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Selected New Trends in Scientific Visualization", "date": "1997-09", "abstract": "Visualization became an important branch of\nscientific research\nduring the past decade. Some topics of visualization, for\nexample, flow visualization and volume visualization, already\nprovide lots of high-quality solutions to the most important\nproblems. Others as, e.g., information visualization, are rather\nyoung disciplines which continuously provide lots of new\nadvances. One such topic is the visualization over the Internet.\nQuite a number of approaches emerged during the last two years\nwhich facilitate this idea and embed the World Wide Web into the\nvisualization process. Another trend in visualization is\ncollaborative visualization within an augmented reality setup.\nUsers exploit real 3D interaction and augmented reality to combine\ncommunication and investigation during research or education.\nThirdly, the visualization of multi-dimensional and multi-modal\ndata is a rather hot challenge to current scientific research.\nCoping with the restriction of just a few dimensions for\nrepresenting visualization results is a big open problem in\n visualization and currently subject to eager research.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 190, 399 ], "number": "TR-186-2-97-17", "pages_from": "1", "pages_to": "16", "research_areas": [], "keywords": [ "Visualization", "web technologies", "augmented reality", "information visualization" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Purgathofer-1997-SNT-paper.gz", "type": "application/octet-stream", "size": 2399698, "path": "Publication:Purgathofer-1997-SNT", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Purgathofer-1997-SNT/Purgathofer-1997-SNT-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Purgathofer-1997-SNT/", "__class": "Publication" }, { "id": "Wilkie-1997-PRL", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Photon Radiosity Lightmaps for CSG Solids", "date": "1997-09", "abstract": "We propose a technique that enables one to exploit the\ninherent ability of stochastic radiosity algorithms to work correctly in the\npresence of arbitrary CSG intersections. With such radiosity algorithms the\ncommon approach to storing the illumination over a surface is to attach\nso--called {\\em lightmaps} to them. By suitably splitting those lightmap\nelements at set--up time that are partitioned in some way by CSG\nintersections, we create an environment where a photon simulation can be\nperformed without any modifications to the algorithm and little run--time\npenalty.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 192, 216, 190 ], "number": "TR-186-2-97-19", "pages_from": "1", "pages_to": "9", "research_areas": [], "keywords": [ "CSG", "functional radiosity", "stochastic radiosity", "lightmaps" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Wilkie-1997-PRL-paper.gz", "type": "application/octet-stream", "size": 71036, "path": "Publication:Wilkie-1997-PRL", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Wilkie-1997-PRL/Wilkie-1997-PRL-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Wilkie-1997-PRL/", "__class": "Publication" }, { "id": "Milik-1997-GMMO", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Geometry of Mixed-mode Oscillations in the 3-d\n Autocatalator", "date": "1997-08", "abstract": "We present a geometric explanation of a basic mechanism\ngenerating mixed-mode oscillations in a prototypical simple\nmodel of a chemical oscillator. Our approach is based on\ngeometric singular perturbation theory and canard solutions. We\nexplain how the small oscillations are generated near a special\npoint, which is classified as a folded saddle-node for the\nreduced problem. The canard solution passing through this point\nseparates small oscillations from large relaxation type\noscillations. This allows to define a one-dimensional return\nmap in a natural way. This bimodal map is capable of\nexplaining the observed bifurcation sequence convincingly.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 417, 418, 399, 166 ], "number": "TR-186-2-97-14", "pages_from": "1", "pages_to": "27", "research_areas": [], "keywords": [ "" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Milik-1997-GMMO-paper.gz", "type": "application/octet-stream", "size": 1756939, "path": "Publication:Milik-1997-GMMO", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Milik-1997-GMMO/Milik-1997-GMMO-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Milik-1997-GMMO/", "__class": "Publication" }, { "id": "Faisstnauer-1997-DINIVE", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Device-Independent Navigation and Interaction in Virtual\n Environments", "date": "1997-08", "abstract": "We present a new approach to the integration of input\ndevices into virtual environment software systems. Our approach employs a\nso-called Mapper module as an intermediate between input device drivers and\nvirtual environment application. Major advantages of our approach are full\ndevice-independence, including the easy integration of new input devices\nand emulation of missing device capabilities, interactive reconfiguration,\nsharing of input devices among multiple applications, automatic selection\nof devices and interaction appropriate for the task, and high-level support\nfor a large variety of navigation styles in virtual environments.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 230, 202, 234 ], "number": "TR-186-2-97-15", "pages_from": "1", "pages_to": "8", "research_areas": [], "keywords": [ "user interface", "virtual environments", "devices" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Faisstnauer-1997-DINIVE-paper.pdf", "type": "application/pdf", "size": 993287, "path": "Publication:Faisstnauer-1997-DINIVE", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Faisstnauer-1997-DINIVE/Faisstnauer-1997-DINIVE-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Faisstnauer-1997-DINIVE/", "__class": "Publication" }, { "id": "tobler97_hsdasr", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "A Hierarchical Subdivision Algorithm for Stochastic Radiosity Methods", "date": "1997-06", "abstract": "The algorithm proposed in this paper uses a stochastic approach to incrementally calculate the illumination function over a surface. By tracking the illumination function at different levels of meshing resolution, it is possible to get a measure for the quality of the current representation, and to adoptively subdivide in places with inadequate accuracy. With this technique a hierarchical mesh that is based on the stochastic evaluation of global illumination is generated.", "authors_et_al": false, "substitute": null, "main_image": { "description": "Hierarchical subdivision of geometric primitives in a scene", "filetitle": "image1", "main_file": true, "use_in_gallery": true, "access": "public", "image_width": 600, "image_height": 600, "name": "tobler97_hsdasr-image1.tiff", "type": "image/tiff", "size": 551318, "path": "Publication:tobler97_hsdasr", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/tobler97_hsdasr/tobler97_hsdasr-image1.tiff", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/1997/tobler97_hsdasr/tobler97_hsdasr-image1:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 216, 192, 245, 190 ], "address": "St. Etienne, France", "booktitle": "Eurographics Rendering Workshop 1997", "editor": "Julie Dorsey and Philipp Slusallek", "lecturer": [ 216 ], "organization": "Eurographics", "pages_from": "193", "pages_to": "204", "publisher": "Springer Wien", "research_areas": [ "Rendering" ], "keywords": [ "radiosity", "monte carlo methods" ], "weblinks": [], "files": [ { "description": "Hierarchical subdivision of geometric primitives in a scene", "filetitle": "image1", "main_file": true, "use_in_gallery": true, "access": "public", "image_width": 600, "image_height": 600, "name": "tobler97_hsdasr-image1.tiff", "type": "image/tiff", "size": 551318, "path": "Publication:tobler97_hsdasr", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/tobler97_hsdasr/tobler97_hsdasr-image1.tiff", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/1997/tobler97_hsdasr/tobler97_hsdasr-image1:thumb{{size}}.png" }, { "description": "Standard scene meshing", "filetitle": "image2", "main_file": false, "use_in_gallery": false, "access": "public", "image_width": 600, "image_height": 600, "name": "tobler97_hsdasr-image2.tiff", "type": "image/tiff", "size": 835592, "path": "Publication:tobler97_hsdasr", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/tobler97_hsdasr/tobler97_hsdasr-image2.tiff", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/1997/tobler97_hsdasr/tobler97_hsdasr-image2:thumb{{size}}.png" } ], "projects_workgroups": [ "rend" ], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/tobler97_hsdasr/", "__class": "Publication" }, { "id": "Wimmer-1997-ITT", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Interactive Techniques in Three-dimensional Modeling", "date": "1997-06", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 193, 216 ], "booktitle": "13th Spring Conference on Computer Graphics", "editor": "Wolfgang Straßer", "isbn": "80-223-1176-6", "organization": "Comenius University, Bratislava, Slovakia", "pages_from": "41", "pages_to": "48", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Wimmer-1997-ITT/", "__class": "Publication" }, { "id": "Loeffelmann-1997-FV2", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Fast Visualization of 2D Dynamical Systems\n by the use of Virtual Ink Droplets", "date": "1997-04", "abstract": "This paper presents a new visualization technique for\nflow fields in 2D. It utilizes a physical model of smearing ink over a\nsheet of paper as an intuitive metaphor for the representation of a\ndynamical system. This technique is capable of producing images that are\ncomparable to those generated with line integral convolution (LIC),\nwhich is a well-known and established visualization technique for planar\nvector fields. Similar to oriented line integral convolution (OLIC), an\nextension to LIC, the virtual ink droplet method is capable of\nvisualizing not only direction and velocity of flow (as LIC does), but\nalso the orientation of vectors. The main advantage of the new method\nis, that animation sequences, which intuitively represent the dynamics\ninduced by the underlying dynamical system, can be computed much more\nefficiently than by the use of LIC or OLIC. A speed-up of about 200 is\nusually achieved when virtual ink droplets are used instead.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 399, 197, 166 ], "number": "TR-186-2-97-13", "pages_from": "1", "pages_to": "8", "research_areas": [], "keywords": [ "visualization", "dynamical systems", "flow visualization" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Loeffelmann-1997-FV2-paper.gz", "type": "application/octet-stream", "size": 1232339, "path": "Publication:Loeffelmann-1997-FV2", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Loeffelmann-1997-FV2/Loeffelmann-1997-FV2-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Loeffelmann-1997-FV2/", "__class": "Publication" }, { "id": "Kresimir-1997-STMT", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "A Survey of Tone Mapping Techniques", "date": "1997-04", "abstract": "This paper gives a survey of tone mapping techniques\nusid with global illumination models. Linear and non-linear methods\nare compared, and drawbacks and strengths of all methods are given\naccording to the authors' opinions. The tone mapping is an important\nstep in the rendering process, and this survey can help potentional\nusers to choose the right mapping technique for a particular\npurpose.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 235, 177, 190 ], "number": "TR-186-2-97-12", "pages_from": "1", "pages_to": "6", "research_areas": [], "keywords": [ "color mapping", "global illumination", "tone mapping" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Kresimir-1997-STMT-paper.gz", "type": "application/octet-stream", "size": 3572949, "path": "Publication:Kresimir-1997-STMT", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Kresimir-1997-STMT/Kresimir-1997-STMT-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Kresimir-1997-STMT/", "__class": "Publication" }, { "id": "Kresimir-1997-ILMCG", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Incident Light Metering in Computer Graphics", "date": "1997-04", "abstract": "Every rendering process consists of two steps. The\nfirst is the computing of luminance values by methods like ray tracing\nor radiosity, and the second step is the mapping of the computed\nvalues to values appropriate for displaying. In the last years, as\nalternative to simple linear scaling which maps the average value to\nthe medium lumninance, some new ways of mapping were introduced. These\nnew methods are based on photography analogies and on human vision\nmodels. All existing methods follow, implicitly or explicitly, the\nreflected light metering principle. The method introduced in this\npaper is the first that follows the incident light metering used in\nprofessional photography and in the movie industry. Actually the\nirradiances are measured using a set of diffusors, which are placed\nautomatically in the scene, and a linear scale factor based on these\nmeasurements is used to map the computed radiances to the display\ndevice. The diffusors act as half space integrators, they collect the\nlight energy from all half space directions. The light comes from the\nprimary light sources, or it is the result of various\ninterreflections. The newly introduced method reproduces original\ncolors faithfully even for scenes with very low or very high average\nreflectivity.Every rendering process consists of two steps. The first\nis the computing of luminance values by methods like ray tracing or\nradiosity, and the second step is the mapping of the computed values\nto values appropriate for displaying. In the last years, as\nalternative to simple linear scaling which maps the average value to\nthe medium lumninance, some new ways of mapping were introduced. These\nnew methods are based on photography analogies and on human vision\nmodels. All existing methods follow, implicitly or explicitly, the\nreflected light metering principle. The method introduced in this\npaper is the first that follows the incident light metering used in\nprofessional photography and in the movie industry. Actually the\nirradiances are measured using a set of diffusors, which are placed\nautomatically in the scene, and a linear scale factor based on these\nmeasurements is used to map the computed radiances to the display\ndevice. The diffusors act as half space integrators, they collect the\nlight energy from all half space directions. The light comes from the\nprimary light sources, or it is the result of various\ninterreflections. The newly introduced method reproduces original\ncolors faithfully even for scenes with very low or very high average\nreflectivity.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 235, 177, 232, 190 ], "number": "TR-186-2-97-11", "pages_from": "1", "pages_to": "9", "research_areas": [], "keywords": [ "color mapping", "global illumination", "tone mapping" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Kresimir-1997-ILMCG-paper.gz", "type": "application/octet-stream", "size": 6155740, "path": "Publication:Kresimir-1997-ILMCG", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Kresimir-1997-ILMCG/Kresimir-1997-ILMCG-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Kresimir-1997-ILMCG/", "__class": "Publication" }, { "id": "Glaeser-1997-EVG", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Efficient Volume-Generation During the Simulation of\n NC-Milling", "date": "1997-04", "abstract": "This paper presents an efficient and robust algorithm for\nthe geometric determination of swept volumes during the simulation of\nNC-milling (three-axis machining and five-axis machining). The boundary Y\nof the volume swept by a cutter F is represented polygonally by using\ninstantaneous helical motions to exactly determine the line of contact\nbetween F and Y.\nApplying concepts of differential geometry allows a better and more\nefficient approximation of tool paths. Tool paths are explicitly calculated\nwhen a design surface G is to be milled along prescribed curves.\nWe also describe how to quickly determine a polygonized representation of\nthe truncated material during the milling process by means of\n'G-buffering'. This polygon-oriented algorithm is perfectly suitable for\nBoolean subtractions and error assessment.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 420, 166 ], "number": "TR-186-2-97-10", "pages_from": "1", "pages_to": "11", "research_areas": [], "keywords": [ "G-Buffer", "sweeps", "solid modeling", "NC-verification", "NC-milling", "computer aided manufacturing" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Glaeser-1997-EVG-paper.gz", "type": "application/octet-stream", "size": 1652501, "path": "Publication:Glaeser-1997-EVG", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Glaeser-1997-EVG/Glaeser-1997-EVG-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Glaeser-1997-EVG/", "__class": "Publication" }, { "id": "Wegenkittl-97-VBH", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Visualizing the Behavior of Higher Dimensional\n Dynamical Systems", "date": "1997-03", "abstract": "In recent years scientific visualization has been\ndriven by the need to visualize high-dimensional data sets within\nhigh-dimensional spaces.\nHowever most visualization methods are designed for showing some\nstatistical features of the data set. This paper deals with the\nvisualization of trajectories of high-dimensional dynamical systems\nwhich form a L^n_n data set of a smooth n-dimensional flow. Three\nmethods that are based on the idea of parallel coordinates are\npresented and discussed. Visualizations done with these new methods\nare shown and an interactive visualization tool for the exploration\nof high-dimensional dynamical systems is proposed.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 165, 399, 166 ], "number": "TR-186-2-97-08", "pages_from": "1", "pages_to": "12", "research_areas": [], "keywords": [ "dynamical system", "multi-dimension visualization" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Wegenkittl-97-VBH-paper.gz", "type": "application/octet-stream", "size": 3729288, "path": "Publication:Wegenkittl-97-VBH", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Wegenkittl-97-VBH/Wegenkittl-97-VBH-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Wegenkittl-97-VBH/", "__class": "Publication" }, { "id": "Wegenkittl-97-FOL", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Fast Oriented Line Integral Convolution for Vector\n Field Visualization via the Internet", "date": "1997-03", "abstract": "Oriented Line Integral Convolution (OLIC) illustrates\nflow fields by convolving a sparse texture with an anisotropic\nconvolution kernel. The kernel is aligned to the underlying flow of\nthe vector field. OLIC does not only show the direction of the flow\nbut also its orientation. This paper presents Fast Rendering of Oriented\nLine Integral Convolution (FROLIC), which is approximately two orders of\nmagnitude faster than OLIC. Costly convolution operations as done in\nOLIC are replaced in FROLIC by approximating a streamlet through a set\nof disks with varying intensity. The issue of overlapping streamlets\nis discussed. Two efficient animation techniques for animating FROLIC\nimages are described. FROLIC has been implemented as a Java applet.\nThis allows researchers from various disciplines (typically with\ninhomogenous hardware environments) to conveniently explore and\ninvestigate analytically defined 2D vector fields.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 165, 166 ], "number": "TR-186-2-97-07", "pages_from": "1", "pages_to": "14", "research_areas": [], "keywords": [ "vector field visualization", "Line Integral Convolution" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Wegenkittl-97-FOL-paper.gz", "type": "application/octet-stream", "size": 1103793, "path": "Publication:Wegenkittl-97-FOL", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Wegenkittl-97-FOL/Wegenkittl-97-FOL-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Wegenkittl-97-FOL/", "__class": "Publication" }, { "id": "Schmalstieg-1997-SAI", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "A Survey of Advanced Interactive 3-D Graphics Techniques", "date": "1997-03", "abstract": "The reader is introduced to the field of interactive\nthree-dimensional graphics. In order to convincingly display a virtual\nworld to a user, hardware-accelerated rendering is not enough. More\ndemanding applications require sophisticated graphics techniques, e.g.\nlevel of detail rendering and visibility culling. This report gives an\noverview of the state of the art in this area.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202 ], "number": "TR-186-2-97-05", "pages_from": "1", "pages_to": "11", "research_areas": [], "keywords": [ "interactive rendering" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Schmalstieg-1997-SAI-paper.gz", "type": "application/octet-stream", "size": 442947, "path": "Publication:Schmalstieg-1997-SAI", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Schmalstieg-1997-SAI/Schmalstieg-1997-SAI-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Schmalstieg-1997-SAI/", "__class": "Publication" }, { "id": "Schmalstieg-1997-SMO", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Smooth Levels of Detail", "date": "1997-03", "abstract": "Levels of detail (LODs) are used in interactive computer\ngraphics to avoid overload of the rendering hardware with to high numbers\nof polygons. While conventional methods use a small set of discrete LODs,\nwe introduce a new class of polygonal simplification: Smooth LODs. A very\nlarge number of small details encoded in a data stream allows a progressive\nrefinement of the object from a very coarse approximation to the original\nhigh quality representation. Advantages of the new approach include\nprogressive transmission and encoding suitable for networked applications,\ninteractive selection of any desired quality, and compression of the data\nby incremental and redundancy free encoding.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202, 422 ], "number": "TR-186-2-97-03", "pages_from": "1", "pages_to": "8", "research_areas": [ "Geometry" ], "keywords": [ "vertex clustering", "progressive meshes", "levels of detail" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Schmalstieg-1997-SMO-paper.pdf", "type": "application/pdf", "size": 159270, "path": "Publication:Schmalstieg-1997-SMO", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Schmalstieg-1997-SMO/Schmalstieg-1997-SMO-paper.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/1997/Schmalstieg-1997-SMO/Schmalstieg-1997-SMO-paper:thumb{{size}}.png" } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Schmalstieg-1997-SMO/", "__class": "Publication" }, { "id": "Schmalstieg-1997-IRN", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "recursIV: Interactive Rendering of Natural Phenomena", "date": "1997-03", "abstract": "We present an approach for direct rendering of natural\nphenomena such as trees, plants or mountains from a procedural\nrepresentation at interactive frame rates. Our approach is based on\ndirected cyclic graphs. It allows to represent extremely complex scenes\nwith little memory and modeling effort. Very large scale virtual\nenvironments are supported by a bandwidth-preserving networking approach\nthat makes use of the compact representation and on-the-fly database\namplification.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202, 249 ], "number": "TR-186-2-97-04", "pages_from": "1", "pages_to": "10", "research_areas": [], "keywords": [ "directed cyclic graphs", "natural phenomena", "fractals", "interactive rendering" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Schmalstieg-1997-IRN-paper.pdf", "type": "application/pdf", "size": 639936, "path": "Publication:Schmalstieg-1997-IRN", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Schmalstieg-1997-IRN/Schmalstieg-1997-IRN-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Schmalstieg-1997-IRN/", "__class": "Publication" }, { "id": "Loeffelmann-1997-VPM", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Visualizing Poincare Maps together with the\n\t\tunderlying flow", "date": "1997-03", "abstract": "We present a set of advanced techniques for the\nvisualization of 2D Poincare maps. Since 2D Poincare\nmaps are a mathematical abstraction of periodic or\nquasiperiodic 3D flows, we propose to embed the\n2D visualization with standard 3D techniques to improve the\nunderstanding of the Poincare maps. Methods to enhance\nthe representation of the relation $x\\leftrightarrow{}P(x)$,\ne.g., the use of spot noise, are presented as well as\ntechniques to visualize the repeated application of $P$,\ne.g., the approximation of $P$ as a warp function. It is\nshown that animation can be very useful to further improve\nthe visualization. For example, the animation of the\nconstruction of Poincare map $P$ is inherently a proper\nvisualization. During the paper we present a set of\n examples which demonstrate the usefulness of our techniques.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 399, 152, 166 ], "number": "TR-186-2-97-06", "pages_from": "1", "pages_to": "17", "research_areas": [], "keywords": [ "Poincare maps", "dynamical systems", "visualization" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Loeffelmann-1997-VPM-paper.gz", "type": "application/octet-stream", "size": 4352068, "path": "Publication:Loeffelmann-1997-VPM", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Loeffelmann-1997-VPM/Loeffelmann-1997-VPM-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Loeffelmann-1997-VPM/", "__class": "Publication" }, { "id": "fuhrmann-1997-CAR", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Collaborative Augmented Reality: Exploring Dynamical\n Systems", "date": "1997-03", "abstract": "In this paper we present collaborative scientific\nvisualization in STUDIERSTUBE. STUDIERSTUBE is an augmented reality system\nthat has several advantages over conventional desktop and other virtual\nreality environments, including true stereoscopy, 3D-interaction,\nindividual viewpoints and customized views for multiple users, unhindered\nnatural collaboration and low cost. We demonstrate the application of this\nconcept for the interaction of multiple users and illustrate it with\nseveral visualizations of dynamical systems in DynSys3D, a visualization\nsystem running on top of AVS.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 204, 399, 202 ], "number": "TR-186-2-97-09", "pages_from": "1", "pages_to": "5", "research_areas": [], "keywords": [ "collaborative work", "dynsys3d", "visulaization", "virtual environment", "augmented reality" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "fuhrmann-1997-CAR-paper.pdf", "type": "application/pdf", "size": 451036, "path": "Publication:fuhrmann-1997-CAR", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/fuhrmann-1997-CAR/fuhrmann-1997-CAR-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/fuhrmann-1997-CAR/", "__class": "Publication" }, { "id": "Szalavari-1997-Studierstube", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "'Studierstube' An Environment for Collaboration in\n Augmented Reality", "date": "1997-01", "abstract": "We propose an architecture for multi-user augmented\nreality with applications in visualization, presentation and education,\nwhich we call ´Studierstube´. Our system presents three-dimensional\nstereoscopic graphics simultaneously to group of users wearing light weight\nsee-through head mounted displays. The displays do not affect natural\ncommunication and interaction, making working together very effective.\nUsers see the same spatially aligned model, but can independently control\ntheir viewpoint and different layers of the data to be displayed. Major\nfield of application serves computer supported cooperative work and\nenhances cooperation of experts. The paper presents the client server\nsoftware architecture underlying this system and details that must be\naddressed to create a high-quality augmented reality setup.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 234, 202, 204, 249 ], "number": "TR-186-2-97-01", "pages_from": "1", "pages_to": "12", "research_areas": [], "keywords": [ "multi-user applications", "augmented reality", "collaboration", "distributed graphics" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szalavari-1997-Studierstube-paper.pdf", "type": "application/pdf", "size": 253380, "path": "Publication:Szalavari-1997-Studierstube", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Szalavari-1997-Studierstube/Szalavari-1997-Studierstube-paper.pdf", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Szalavari-1997-Studierstube/", "__class": "Publication" }, { "id": "Loeffelmann-1997-HSV", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Hierarchical Streamarrows for the Visualization of\n Dynamical Systems", "date": "1997-01", "abstract": "Streamarrows are a technique to enhance the use of\nstreamsurfaces by separating arrow-shaped portions from the\nremaining streamsurface. We present a hierarchical streamarrows\nalgorithm as an extension to this technique: Streamarrows are\nlocally chosen from a stack of scaled streamarrows textures to\navoid too big or small streamarrows in the rendered image. We\nfurthermore present techniques how streamarrows can be extended\ninto 3D, namely perpendicular to the streamsurface: streamarrows\ncan be shifted slightly out of the streamsurface. Another\nextension in this category is to represent the outline of\nstreamarrows as 3D tubes. We show a set of images which have been\n rendered using this technique and report about ongoing research.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 399, 184, 166 ], "number": "TR-186-2-97-02", "pages_from": "1", "pages_to": "13", "research_areas": [], "keywords": [ "streamsurfaces", "visualization", "dynamical systems" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Loeffelmann-1997-HSV-paper.gz", "type": "application/octet-stream", "size": 2587496, "path": "Publication:Loeffelmann-1997-HSV", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Loeffelmann-1997-HSV/Loeffelmann-1997-HSV-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Loeffelmann-1997-HSV/", "__class": "Publication" }, { "id": "Schmalstieg-thesis", "type_id": "phdthesis", "tu_id": null, "repositum_id": "20.500.12708/13461", "title": "The Remote Rendering Pipeline - Managing Geometry and Bandwidth in Distributed Virtual Environments", "date": "1997", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 202 ], "date_end": "1997-12", "date_start": "1995-03", "open_access": "yes", "pages": "146", "supervisor": [ 249 ], "research_areas": [], "keywords": [ "Dreidimensionale Computergrafik", "Interaktion", "Virtuelle Realität", "Verteiltes System", "Modell" ], "weblinks": [], "files": [ { "description": null, "filetitle": "pdf", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Schmalstieg-thesis-pdf.pdf", "type": "application/pdf", "size": 1204787, "path": "Publication:Schmalstieg-thesis", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Schmalstieg-thesis/Schmalstieg-thesis-pdf.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/1997/Schmalstieg-thesis/Schmalstieg-thesis-pdf:thumb{{size}}.png" } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Schmalstieg-thesis/", "__class": "Publication" }, { "id": "Tobler-thesis", "type_id": "phdthesis", "tu_id": null, "repositum_id": null, "title": "Global Illumination using Stochastic Radiosity for Constructive Solid Geometry", "date": "1997", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 216 ], "date_end": "1997-04", "date_start": "1994-04", "supervisor": [ 190 ], "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Tobler-thesis/", "__class": "Publication" }, { "id": "traxler-1997-TRA", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Efficient Ray Tracing of Complex Natural Scenes", "date": "1997", "abstract": "In this paper we present a method for the consistent modelling and efficient ray tracing of complex natural scenes. Both plants and terrains are modelled and represented in the same way to allow mutual influences of their appearance and interdependencies of their geometry. Plants are generated together with a fractal terrain, so that they directly grow on it. This allows an accurate calculation of reflections and the cast of shadows. The scenes are modeled with a special kind of PL-Systems and are represented by cyclic object-instancing graphs. This is a very compact representation for ray tracing, which avoids restrictions to the complexity of the scenes. To significantly increase the\nefficiency of ray tracing with this representation an adaptation of conventional optimization\ntechniques to cyclic graphs is necessary. In this paper we introduce methods for the calculation of a\nbounding box hierarchy and the use of a regular 3d-grid for cyclic graphs.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 237, 249 ], "booktitle": "Proceedings of Fractal 97", "date_from": "2007", "editor": "M. M. Novak and T. G. 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