17th and 18th century music scores were copied and distributed in a manual way. Music historians are interested in how the comp.sitions were distributed or in other words, who copied the comp.sitions when and where. S...
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ISBN:
(纸本)0889863784
17th and 18th century music scores were copied and distributed in a manual way. Music historians are interested in how the comp.sitions were distributed or in other words, who copied the comp.sitions when and where. Such information may also help to determine the comp.ser when a piece of unknown origin is found. In this paper, we present ongoing work on the development of a software system to analyse such documents automatically and to aid the musicologists in their task to register handwritten music scores. In particular, we focus on the application and adaptation of image processing methods to separate music symbols for the identification task from irrelevant elements.
In order to generate 3D worlds in an automated way it is important to solve the problem of integrating existing 2D and 3D data automatically. We explain some of the issues of this problem in this paper. We also introd...
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In order to generate 3D worlds in an automated way it is important to solve the problem of integrating existing 2D and 3D data automatically. We explain some of the issues of this problem in this paper. We also introduce mechanisms for automated generation of integrated 3D geo-data sets, as well as a prototype that implements these. It is necessary to distinguish the different problems and methods for the generation of buildings and other man made structures on the one hand and digital elevation models and land use areas on the other. Using the integrated data and the developed algorithms we work on a strategy for the dynamic generation of 3D tour animations through a virtual city and landscape model that is optimized for a specific tour. We introduce comp.nents that allow the generation of a virtual 3D-tour through our demonstration region - the city of Heidelberg - by the automated integration of 2D and 3D data sources to a 3D model. The user is presented with an interactive animation of a 3D scene of a dynamically calculated tour through the hybrid 3D model of Heidelberg focusing on the area around the tour.
In this paper, we evaluate several means of presenting route inst.uctions to a mobile user. Starting from an abstract language- independent description of a route segment, we show how to generate various presentations...
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ISBN:
(纸本)9781581135862
In this paper, we evaluate several means of presenting route inst.uctions to a mobile user. Starting from an abstract language- independent description of a route segment, we show how to generate various presentations for a mobile device ranging from spoken inst.uctions to 3D visualizations. We then examine the relationship between the quality of positional information, available resources and the different types of presentations. The paper concludes with guidelines that help to determine which presentation to choose for a given situation.
We consider the inverse problem of determining an arbitrary source in a time-dependent convective-diffusive transport equation, given a velocity field and pointwise measurements of the concentration. Applications that...
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We consider the inverse problem of determining an arbitrary source in a time-dependent convective-diffusive transport equation, given a velocity field and pointwise measurements of the concentration. Applications that give rise to such problems include determination of groundwater or airborne pollutant sources from measurements of concentrations, and identification of sources of chemical or biological attacks. To address ill-posedness of the problem, we employ Tikhonov and total variation regularization. We present a variational formulation of the first-order optimality system, which includes the initial-boundary value state problem, the final-boundary value adjoint problem, and the space-time boundary value source problem. We discretize in the space-time volume using Galerkin finite elements. Several examples demonstrate the influence of the density of the sensor array, the effectiveness of total variation regularization for discontinuous sources, the invertibility of the source as the transport becomes increasingly convection-dominated, the ability of the space-time inversion formulation to track moving sources, and the optimal convergence rate of the finite element approximation. Published by Elsevier Science B.V.
The skeleton is an effective representation of object shapes. Methods based on distance transformation can generate skeletons with accurate position, but connectivity of the skeleton branches must be carefully checked...
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The skeleton is an effective representation of object shapes. Methods based on distance transformation can generate skeletons with accurate position, but connectivity of the skeleton branches must be carefully checked. It is difficult to check the connectivity when the structures of the skeleton are very comp.icated. A dynamic skeleton algorithm for binary images is presented by combining with thinning method and Snake model technique. First, we comp.te the initial skeleton based on thinning technology in which the connectivity and the topology of the skeleton can be kept well. Then the initial skeleton can be led to its accurate locations in distance field based on Snake model technique. The skeletons generated by this method are not only locating at accurate positions, but also with correct connectivity and topology.
Surfaces reconstruction from serial section images is a mature research in visualization of medical imaging. Traditional methods always adopt the process that starts on mesh reconstruction or isosurfaces extraction, t...
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Surfaces reconstruction from serial section images is a mature research in visualization of medical imaging. Traditional methods always adopt the process that starts on mesh reconstruction or isosurfaces extraction, then data simplification. Since the volumetric datasets are huge and segmented. Most of the existing algorithms that use large in-core data structures might be too large to off-load to disk. An algorithm is presented that is designed to reconstruct 3D surfaces from huge and segmented volumetric datasets. Approximate mesh can be reconstructed and simplified layer by layer. And user can control mesh comp.exity by parameters. Because memories are used rationally, some surfaces reconstruction from large datasets can work on PC using the algorithm.
The minimal surfaces are extensively employed in many areas such as architecture, aviation, ship manufacture, and so on. However, the comp.exity of the minimal surface equation prevents people from modeling the minima...
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The minimal surfaces are extensively employed in many areas such as architecture, aviation, ship manufacture, and so on. However, the comp.exity of the minimal surface equation prevents people from modeling the minimal surface in CAD/CAGD. Based on the nonlinear programming and the FEM (finite element method), the approximation to the solution of the minimal surface equation bounded by Bezier or B-spline curves is investigated. A global method, which is called numerical extension method, is appealed to in the whole iterative process and linearize the nonlinear finite element system by using a simple iteration. Some numerical results are given.
A discrete algorithm for grayscale image resizing through binary image zooming in 3D space is presented. The method can help to keep the edges and borders in the zoomed images as clear and natural as possible, with ar...
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A discrete algorithm for grayscale image resizing through binary image zooming in 3D space is presented. The method can help to keep the edges and borders in the zoomed images as clear and natural as possible, with arbitrary real positive scaling factors. When an image is enlarged, it can be still with vivid color, and express the appearance of original image faithfully. When the size of an image is reduced, the most important features of the image can also be preserved. Experiments show that the new method is effective, stable and convenient for image zooming, and it is also more advantageous in border and edge preserving comp.red to many common commercial software. We have applied the algorithm in our medical image processing system.
Visualization and collision detection are two of the most important problems connected with implicit objects. Enumeration algorithms can be used either directly or as preprocessing step for many algorithms solving the...
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ISBN:
(纸本)9781581136081
Visualization and collision detection are two of the most important problems connected with implicit objects. Enumeration algorithms can be used either directly or as preprocessing step for many algorithms solving these problems. In general, enumeration algorithms based on recursive space subdivision are reliable tools to encounter those parts in space, where the object might be located. But the bad performance and the huge number of comp.ted enclosing cells, if high precision is required, are grave drawbacks. Implicit Linear Interval Estimations (ILIEs) introduced in this paper are implicit interval (hyper-)planes providing oriented tight bounds of the object within given cells. It turns out that the use of ILIEs highly improves the performance of the classical enumeration algorithm and the quality of the results. The theoretical background as well as a fast and simple technique to comp.te ILIEs are presented. The applicability of ILIEs is demonstrated by means of a modified enumeration algorithm that has been implemented and tested for implicit surfaces.
Normal vector discontinuities on surfaces provide important visual cues for understanding the image of a geometrical object since they often indicate feature boundaries. We present an algorithm that preserves the appe...
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ISBN:
(纸本)9781581136081
Normal vector discontinuities on surfaces provide important visual cues for understanding the image of a geometrical object since they often indicate feature boundaries. We present an algorithm that preserves the appearance of features in view-dependent multiresolution meshes. The algorithm is shown to be efficient in terms of time and memory consumption. Our method is comp.tible with geomorphing to eliminate popping artefacts in interactive applications, and it can also be applied to texture coordinates. A large set of examples demonstrates the benefits of the proposed algorithm.
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