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"title": "A Multi-Purpose Virtual Reality Model of the Solar System (VRMoSS)",
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"title": "New Time-Dependent Tone mapping Algorithm",
"date": "2001-11",
"abstract": "In this report we present a new\ntime-dependent tone mapping model which describes the ability of the\nhuman vision to adapt to even strong changes in the luminance of the\nsurroundings. This ability depends on time; in fact the human visual\nsystem needs a determined amount of time until reaching the final\nstage of adaptation. Our model accepts the CIEXYZ values of an image\nas input and converts them into RGB values reproducible on a monitor.\nThis work is based on the retinal model presented by Pattanaik et al.\n, but introducing substantial modifications. In fact, we define a new\ndynamic model which describes the time dependence of the human visual\nsystem, utilizing different filters; the cromatic adaptation is taken\ninto account by introducing the model of von Kries. Furthermore, we\nintroduce new techniques of gamut mapping and conversion between the\n values of retinal response and luminance of the display.",
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"title": "Cost-Driven Multiple Importance Sampling for Monte-Carlo Rendering",
"date": "2001-10",
"abstract": "The global illumination or transport problems can\nalso be considered as a sequence of\nintegrals, while its Monte-Carlo solutions as different sampling techniques.\nMultiple importance sampling takes advantage of different sampling\nstrategies and combines the results obtained with them.\nIn this paper we propose the combination of very different global illumination algorithms\nin a way that their strengths can be preserved. To do this, we generalize the fundamental theory of\nmultiple importance sampling for sequences of integrals and also take into account\nthe computational cost associated with individual sampling techniques.\nThe theoretical results are used to combine bi-directional path tracing and ray-bundles\n based stochastic iteration.",
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"title": "Insight into Data Through Visualization",
"date": "2001-10",
"abstract": "Computer graphics, scientific visualization, information visualization, and graph drawing are areas which deal with visual\ninformation layout. They all use the remarkable properties of\nthe human visual perception to rapidly absorb and analyse visual\ninformation. The paper discusses important visualization aspects\nand gives examples of how visualization techniques facilitate\ninsight into data characteristics. The connection between\n visualization and graph drawing is shortly discussed.",
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"title": "Visibility Preprocessing for Urban Scenes using Line Space Subdivision",
"date": "2001-10",
"abstract": "We present an algorithm for visibility preprocessing of urban environments. The algorithm uses a subdivision of line space to analytically calculate a conservative potentially visible set for a given region in the scene. We present a detailed evaluation of our method including a comparison to another recently published visibility preprocessing algorithm. To the best of our knowledge the proposed method is the first algorithm that scales to large scenes and efficiently handles large view cells.",
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"title": "Instant Visibility",
"date": "2001-09",
"abstract": "We present an online occlusion culling system which computes visibility in parallel to the rendering pipeline. We show how to use point visibility algorithms to quickly calculate a tight potentially visible set (PVS) which is valid for several frames, by shrinking the occluders used in visibility calculations by an adequate amount. These visibility calculations can be performed on a visibility server, possibly a distinct computer communicating with the display host over a local network. The resulting system essentially combines the advantages of online visibility processing and region-based visibility calculations, allowing asynchronous processing of visibility and display operations. We analyze two different types of hardware-based point visibility algorithms and address the problem of bounded calculation time which is the basis for true real-time behavior. Our results show reliable, sustained 60 Hz performance in a walkthrough with an urban environment of nearly 2 million polygons, and a terrain flyover.",
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"location": "Manchester, UK",
"note": "Günther Enderle [Best Paper] Award, Best Student Paper Award. A. Chalmers and T.-M. Rhyne (eds.), Proceedings EUROGRAPHICS 2001",
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"volume": "20",
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"id": "Wimmer-2001-CCL",
"type_id": "inproceedings",
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"repositum_id": null,
"title": "Computerspiele in der Computergraphik-Lehre",
"date": "2001-09",
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"booktitle": "Wirtschaft und Wissenschaft in der Network Economy -- Visionen und Wirklichkeit, Tagungsband der GI/OCG-Jahrestagung",
"editor": "Kurt Bauknecht and Wilfried Brauer and Thomas A. Mück",
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"id": "Szirmay-2001-METR",
"type_id": "techreport",
"tu_id": null,
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"title": "Simple and Robust Mutation Strategy for Metropolis Light Transport Algorithm",
"date": "2001-07",
"abstract": "The paper presents a new mutation strategy for the Metropolis\nlight transport algorithm, which works in\nthe space of uniform random numbers used to build up paths. Thus\ninstead of mutating directly in the path space, mutations are realized\nin the infinite dimensional unit cube of pseudo-random numbers and these points are\ntransformed to the path space according to BRDF\nsampling, light source sampling and Russian roulette.\nThis transformation makes the integrand and the importance\nfunction flatter and thus increases the acceptance probability\nof the new samples in the Metropolis algorithm. Higher\nacceptance ratio,\nin turn, reduces the correlation of the samples, which increases the\nspeed of convergence.\nWhen mutations are calculated,\na new random point is selected usually in the neighborhood of the previous\none, but according to our proposition called ``large steps'',\nsometimes an independent point is obtained.\nLarge steps greatly reduce the start-up bias and guarantee the ergodicity\nof the process. Due to the fact that some samples are generated\nindependently of the previous sample, this method can also be\nconsidered as a combination of the Metropolis algorithm with a\nclassical random walk. Metropolis light\ntransport is good in rendering bright image areas but poor in\nrendering dark sections since it allocates samples proportionally\nto the pixel luminance. Conventional random walks, on the other hand,\nhave the same performace everywhere, thus they are poorer than\nMetropolis method in bright areas, but are better at dark sections.\nIn order to keep the merits of\nboth approaches, we use multiple importance sampling to combine\ntheir results, that is, the combined method will be\nas good at bright regions as Metropolis and\nat dark regions as random walks.\nThe resulting scheme is robust, efficient, but most importantly,\n is easy to implement and to combine with an available random-walk algorithm.",
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"id": "Szirmay-2001-MSTI",
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"title": "Multiple Strategy Stochastic Iteration for Architectural Walkthroughs",
"date": "2001-07",
"abstract": "Architectural walkthroughs require fast global illumination algorithms\nand also accurate results from certain viewpoints.\nThis paper introduces a global illumination method that combines several\nstrategies to meet the\ncontradicting criteria of architectural\nwalkthroughs. The methods include parallel and perspective ray-bundle shooting\nand ray shooting. Each method is designed to randomly approximate the effect\nof the light transport operator. Parallel ray-bundle tracing transfers the\nradiance of all points parallel to a randomly selected global direction,\nwith perspective ray-bundles we can shoot the radiance of a single patch in all directions,\nand ray shooting transfers the radiance of a randomly\nselected point at a randomly selected direction.\nThese strategies are of complementary character\nsince each of them is effective in different illumination conditions.\nThe proposed algorithm is iterative and\nthe steps realized by different methods that randomly follow each other.\nIn each step, the applied strategy is selected randomly according to the properties of\nthe current radiance distribution, thus we can exploit that the used strategies\nare good in different conditions.\nThe formal framework of their combination is the stochastic iteration.\nAlthough the final result is the image, i.e. the algorithm is view dependent,\na rough approximation of the\nradiance function is stored in object space, that can allow fast movements at\nreasonable storage requirements and also speed up Monte-Carlo simulations which\nresult in the final image.\nThe method is also suited for interactive walkthrough animation in\nglossy scenes since when the viewpoint changes, the object space radiance\n values remain valid and the image quickly adapts to the new situation.",
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"title": "Representing and Rendering Distant Objects for Real-Time Visualization",
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"title": "Point-Based Impostors for Real-Time Visualization",
"date": "2001-06",
"abstract": "We present a new data structure for encoding the appearance of a geometric model as seen from a viewing region (view cell). This representation can be used in interactive or real-time visualization applications to replace a complex model by an impostor, maintaining high quality rendering while cutting down rendering time. Our approach relies on an object-space sampled representation similar to a point cloud or a layered depth image, but introduces two fundamental additions to previous techniques. First, the sampling rate is controlled to provide sufficient density across all possible viewing conditions from the specified view cell. Second, a correct, antialiased representation of the plenoptic function is computed using Monte Carlo integration. Our system therefore achieves high quality rendering using a simple representation with bounded complexity. We demonstrate the method for an application in urban visualization.",
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{
"id": "Theussl-2001-RIV",
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"tu_id": null,
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"title": "Reconstruction Issues in Volume Visualization",
"date": "2001-06",
"abstract": "Although volume visualization has already grown out of its infancy,\nthe most commonly used reconstruction techniques are still trilinear\ninterpolation for function reconstruction and central differences\n(most often in conjunction with trilinear interpolation) for\ngradient reconstruction. Nevertheless, quite some research in the\nlast few years was devoted to improve this situation. This paper\nsurveys the more important methods, emphasizing selected work in\nfunction and gradient reconstruction, and gives an overview over the\nrather new development of exploiting curvature properties for volume\n visualization purposes.",
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"title": "Direction-Driven Shape-Based Interpolation of Volume Data",
"date": "2001-05",
"abstract": "We present a novel approach to shape-based interpolation of\ngray-level volume data. In contrast to the segmentation-based\ntechniques our method directly processes the scalar volume\nrequiring no user interaction. The key idea is to perform the\ninterpolation in the directions given by analysis of the\neigensystem of the structure tensor. Our method processes a 256\nx 256 slice within a couple of seconds yielding satisfactory\nresults. We give a quantitative and a visual comparison to the\nlinear inter-slice interpolation. Analysis of the results lead\nus to the conclusion that our technique has a strong potential\nto compete with well-established shape-based interpolation\n algorithms.",
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"title": "Optimal Regular Volume Sampling",
"date": "2001-04",
"abstract": "The classification of volumetric data sets as well as their\nrendering algorithms are typically based on the representation of the\nunderlying grid. Grid structures based on a Cartesian lattice are\nthe de-facto standard for regular representations of volumetric\ndata. In this paper we introduce a more general concept of regular\ngrids for the representation of volumetric data. We demonstrate that\na specific type of regular lattice - the so-called\nbody-centered cubic - is able to represent the same data set\nas a Cartesian grid to the same accuracy but with 29.3% less\nsamples. This speeds up traditional volume\nrendering algorithms by the same ratio, which we demonstrate by\nadopting a splatting implementation for these new lattices.\nWe investigate different filtering methods required for computing\nthe normals on this lattice. The lattice representation results also\nin lossless compression ratios that are better\nthan previously reported.\nAlthough other regular grid structures achieve the same sample\nefficiency, the body-centered cubic is particularly easy to use. The\nonly assumption necessary is that the underlying volume is isotropic\nand band-limited - an assumption that is valid for most practical\n data sets.",
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"title": "Combined Rendering of Polarization and Fluorescence Effects",
"date": "2001-04",
"abstract": "We propose a practicable way to include both polarization and fluorescence effects in a rendering system at the same time. Previous research in this direction only demonstrated support for either one of these phenomena; using both effects simultaneously was so far not possible, mainly because the techniques for the treatment of polarized light were complicated and required rendering systems written specifically for this task.\n\t\t The key improvement over previous work is that we use a different, more easily handled formalism for the description of polarization state, which also enables us to include fluorescence effects in a natural fashion. Moreover, all of our proposals are straightforward extensions to a conventional spectral rendering system.",
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216,
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"title": "Virtual Colon Unfolding",
"date": "2001-04",
"abstract": "The majority of virtual endoscopy techniques tries to simulate a\nreal endoscopy. A real endoscopy does not always give the optimal\ninformation due to the physical limitations it is subject to. In\nthis paper, we deal with the unfolding of the surface of the colon\nas a possible visualization technique for diagnosis and polyp\ndetection. A new two-step technique is presented which deals with\nthe problems of double appearance of polyps and nonuniform\nsampling that other colon unfolding techniques suffer from. In the\nfirst step, a distance map from a central path induces nonlinear\nrays for unambiguous parameterization of the surface. The second\nstep compensates for locally varying distortions of the unfolded\nsurface. A technique similar to magnification fields in\ninformation visualization is hereby applied. The technique\n produces a single view of a complete virtually dissected colon.",
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"number": "TR-186-2-01-08",
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"keywords": [
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"title": "Fast Visualization of Object Contours by Non-Photorealistic Volume Rendering",
"date": "2001-04",
"abstract": "In this paper we present a fast visualization technique for\nvolumetric data, which is based on a recent non-photorealistic\nrendering technique. Our new approach enables alternative\ninsights into 3D data sets (compared to traditional approaches\nsuch as direct volume rendering or iso-surface rendering).\nObject contours, which usually are characterized by locally high\ngradient values, are visualized regardless of their density values.\nCumbersome tuning of transfer functions, as usually needed for setting\nup DVR views is avoided. Instead, a small number of parameters is available to adjust the non-photorealistic display.\nBased on the magnitude of local gradient information as well as on\nthe angle between viewing direction and gradient vector, data values\nare mapped to visual properties (color, opacity), which then are\ncombined to form the rendered image (MIP is proposed as the default\ncompositing stragtegy here). Due to the fast implementation of this\nalternative rendering approach, it is possible to interactively\ninvestigate the 3D data, and quickly learn about internal structures.\nSeveral further extensions of our new approach, such as level lines\n are also presented in this paper.",
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"number": "TR-186-2-01-09",
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"tu_id": null,
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"title": "Exact Regional Visibility using Line Space Partitioning",
"date": "2001-03",
"abstract": "We present a new technique for exact and output sensitive\ndetermination of visibility from a polygonal region in the plane. It\nuses hierarchical partitioning of line space, that provides\ncomprehensive description of visibility for a set of occluders.\nTo the best of our knowledge, it is the first exact regional\nvisibility algorithm suitable for visibility preprocessing of large\nscenes of unspecific type. We have evaluated the implementation on\n scenes with various visibility characteristics.",
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"number": "TR-186-2-01-06",
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"keywords": [
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{
"id": "buehler-2001-ueb",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Über den Schnitt zweier Linearer Intervallabschätzungen",
"date": "2001-03",
"abstract": "Lineare Intervallabschätzungen (LIEs) für parametrische Flächen sind parametrisierte Einschließungskörper, die in [1] im Zusammenhang mit einem Schnittalgorithmus für parametrische Flächen eingeführt wurden. Diese Arbeit enthält die Sätze und Beweise, die die Grundlage für den in [1] erwähnten Schnitttest mit automatischer Parametergebietsreduzierung bilden. [1] K.Bühler, W.Barth, A new intersection algorithm for parametric surfaces based on linear interval estimations, In: Scientific Computing, Validated Numerics, Interval Methods, Kluwer Academic Publishers, To Appear in Spring 2001.",
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{
"id": "Kanitsar-2001-PVI",
"type_id": "techreport",
"tu_id": null,
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"title": "Peripheral Vessel Investigation For Routine Clinical Use",
"date": "2001-03",
"abstract": "This paper is about computed tomography angiography based vessel exploration.\nLarge image sequences of the lower extremities are investigated in a clinical\nenvironment. Two different approaches for peripheral vessel diagnosis dealing\nwith stenosis and calcification detection are introduced. The paper presents an\nautomated vessel-tracking tool for curved planar reformation. A user interactive\n segmentation tool for bone removal is proposed.",
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166
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"number": "TR-186-2-01-13",
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"keywords": [
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"type_id": "techreport",
"tu_id": null,
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"title": "Finger Tracking for Interaction in Augmented Environments",
"date": "2001-02",
"abstract": "Optical tracking systems allow three-dimensional input for virtual\nenvironment applications with high precision and without annoying\ncables. Spontaneous and intuitive interaction is possible through\ngestures. In this paper, we present a finger tracker that allows\ngestural interaction and is simple, cheap, fast, robust against\nocclusion and accurate. It is based on a marked glove, a stereoscopic\ntracking system and a kinematic 3-d model\nof the human finger. Within our augmented reality application\nscenario, the user is able to grab, translate, rotate, and release\nobjects in an intuitive way. We demonstrate our tracking system in\nan augmented reality chess game allowing a user to interact with\n virtual objects.",
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201,
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"number": "TR-186-2-01-03",
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"keywords": [
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"computer vision",
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{
"id": "Hey-2001-Glo",
"type_id": "techreport",
"tu_id": null,
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"title": "Global Illumination with Photon Map Compensation",
"date": "2001-01",
"abstract": "We present a new method for the simulation of global illumination by utilization of a photon map. It uses an advanced radiance estimation which, in contrast to classical nearest neighbor area estimation, does not assume that the nearest neighbor photons lie in one plane or that they are uniformly distributed around the illuminated point. This allows us to correcly handle indirect illumination, eg. caustics, at edges and corners of objects without causing illumination artefacts in the vicinity of the edges and corners. We show how high quality results can be achieved by directly visualizing this illumination estimate without the usual low frequency noise of photon maps and without requiring a very large photon map.",
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200,
190
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"number": "TR-186-2-01-04",
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"keywords": [
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{
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"tu_id": null,
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"title": "Importance Sampling with Hemispherical Particle Footprints",
"date": "2001-01",
"abstract": "We present a new importance sampling technique for stochastic ray-based global illumination methods. It allows to enhance the efficiency of global illumination calculations in general scenes with complex illumination settings by selecting preferably those sampling or shooting directions which yield a high contribution. The probability density functions for this are generated with a photon map or importance map that represents the expected contribution. A direction for a given point in the scene is selected by making directional footprints of the nearest neighbor particles onto the hemisphere of the point. By selecting the radii of the footprints adaptively according to the directional density of the particles, rays can be shot precisely into highly contributing regions where several particles come from in a small solid angle. We compare our new technique with existing particle map based importance sampling and show that our new technique achieves a considerably lower level of noise and spots in the same computation time.",
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"number": "TR-186-2-01-05",
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{
"id": "Artusi-2001-Col",
"type_id": "inproceedings",
"tu_id": null,
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