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检索条件"任意字段=14th Brazilian Symposium on Computer Graphics and Image Processing"

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Viz3D: effective exploratory visualization of large multidimensional data sets

Viz3D: effective exploratory visualization of large multidim...

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： A.O. Artero M.C.F. de Oliveira Instituto de Ciências Matemáticas e Computação Universidade de Sáo Paulo Sao Paulo Brazil

We propose a multidimensional visualization technique, named Viz3D, that creates a 3D representation of n-dimensional data that may be interactively manipulated by users to handle visual cluttering and object occlusion. the projection performed in Viz3D is comparable in quality with the 3D projections obtained with well-known dimensionality reduction techniques, at a lower complexity cost. While a 3D projection conveys more information, giving the user more control of the visual representation and an additional dimension, as compared to 2D, visual cluttering and object occlusion are still a problem in handling large multidimensional data sets. To produce more effective visualizations, two strategies are introduced. Dimensionality is handled with a similarity clustering of attributes prior to projection. Data set size is handled with a new strategy of visualizing data densities, rather than individual data records. Both the direct and density Viz3D visualizations provide the basis for a user driven visual clustering approach applicable to high-dimensional data sets that is very simple, intuitive and effective.

关键词： Data visualization Multidimensional systems Data analysis Terminology image analysis Information analysis Pattern analysis Shape Iris Statistics

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three-dimensional registration and analysis for brain SPECT images

Three-dimensional registration and analysis for brain SPECT ...

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2004 Nuclear Science symposium, Medical Imaging Conference, symposium on Nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors

作者： Liao, Yuan-Lin Sun, Yung-Nien Chiu, Nan-Tsing Visual System Laboratory Department of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan Department of Nuclear Medicine National Cheng Kung University Hospital Tainan Taiwan

Tc-99m HMPAO is a typical tracer used in the analysis of cerebral blood flow. Single photon emission computed tomography (SPECT) brain imaging utilizing Tc-99m HMPAO is thus a popular method to assess brain function. An image analysis system for SPECT images that performs a series of image processing procedures including three-dimensional (3-D) image registration, brain extraction, and intensity normalization, is presented here to map all the 3-D brain data to the same space. Afterward, the aligned images undertake a standard statistical analysis, the paired t test, to detect the areas that have significant deviations between the two sets of images. the statistical t map is then represented with a color plot for each brain slice to indicate the activation foci. the registration results are evaluated on the designed phantom images, the acquired clinical images, and by visual inspection. the experimental studies reveal that the subvoxel accuracy is achieved and the consistency is also maintained. Besides, the resulting statistic maps are found very helpful to doctors for lesion evaluation and localization in the clinical diagnosis of schizophrenic patients. © 2004 IEEE.

关键词： image analysis

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brazilian symposium of computer Graphic and image processing

Brazilian Symposium of Computer Graphic and Image Processing

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16th brazilian symposium on computer graphics and image processing, SIBGRAPI 2003

ISBN: (纸本)0769520324

the proceedings contain 52 papers. the topics discussed include: an approximation for normal vectors of deformable models;a hole-filling strategy for reconstruction of smooth surfaces in range images;moving least squares multiresolution surface approximation;fast stellar mesh simplification;reliable algorithms for ray intersection in computer graphics based on interval arithmetic;a topological framework for advancing front triangulation;reconstruction using surface dedicated tensorial fields;a non-self-intersection Douglas-Peucker algorithm;the language LinF for fractal specification;creating and editing curves on subdivision surfaces;a rules-based model used to describe group dynamics for games;frequency plot and relevance plot to enhance visual data exploration;and frequency plot and relevance plot to enhance visual data exploration.

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Proceedings 16th brazilian symposium on computer graphics and image processing (SIBGRAPI 2003)

Proceedings 16th Brazilian Symposium on Computer Graphics an...

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

the following topics are dealt with: computer graphics; image segmentation; geometric modeling; rendering; graphic simulation; image retrieval; image coloring; video summarization; image motion analysis; data visualiz... 详细信息

关键词： Rendering (computer graphics) Computational geometry Visualization Surface fitting image processing Access control

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Graphic simulation for virtual prototyping with JAVA3D 16

Graphic simulation for virtual prototyping with JAVA3D

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16th brazilian symposium on computer graphics and image processing

作者： Miranda, FR Dos Santos, CS Kogler, JE Fac SENAC BR-05051000 Sao Paulo SP Brazil

ISBN: (纸本)0769520324

this paper reports some issues involved in the construction of an interactive, interoperable application, whose primary purpose is to be used as a virtual mockup. this graphic tool was tailored for machine vision application prototyping, to cope with metrological settings of large part assemblies. Some relevant aspects of designing interactive 3D applications will be discussed, including an account of some modem graphics libraries, particularly Java 3D. the achieved results, including some interesting byproducts of this work, to be publicly distributed soon, are also presented.

关键词： Computational modeling computer graphics computer simulation image processing Java Virtual prototyping

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A topological framework for advancing front triangulation 16

A topological framework for advancing front triangulation

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16th brazilian symposium on computer graphics and image processing

作者： Medeiros, E Velho, L Lopes, H IMPA Rio De Janeiro Brazil

In this paper we study advancing front methods for surface reconstruction. We propose a topological framework based on handlebody theory to implement such methods in a simple and robust way. As an example of the appli... 详细信息

ISBN: (纸本)0769520324

关键词： Application software computer graphics Iterative algorithms Photography Reconstruction algorithms Robustness Solid modeling Space technology Surface reconstruction Topology

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Object segmentation in image sequences by watershed from markers: A generic approach 16

Object segmentation in image sequences by watershed from mar...

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16th brazilian symposium on computer graphics and image processing

作者： Flores, FU Lotufo, RD Departamento de Informática UEM Brazil Faculdade de Engenharia Elétrica e de Computação UNICAMP Brazil

ISBN: (纸本)0769520324

In this paper we propose a generic method to interactive object segmentation in image sequences. this method consists in the extension of efficient techniques of static image segmentation to image sequences by combining them to fast motion estimation techniques. the proposed method has the following characteristics: interactivity, generality, rapid response and progressive manual edition.

关键词： Biomedical imaging image segmentation image sequences Motion estimation MPEG 4 Standard Object detection Object segmentation Tracking Video coding Video surveillance

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Area fractions by linear analysis of intensity level histograms 16

Area fractions by linear analysis of intensity level histogr...

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16th brazilian symposium on computer graphics and image processing

作者： da Costa, JATB Univ Fed Santa Maria Dept Fis CCNE BR-97105900 Santa Maria RS Brazil

ISBN: (纸本)0769520324

Linear analysis of intensity level histograms is proposed as a method to determine the area fractions of homogeneous components of images. the area tractions are the coefficients of the respective histograms in the linear combination that best fits the histogram of the entire image. this method can be applied whenever the components can be identified by their individual histograms which must be linearly independent. Its accuracy was tested for images of real surfaces that were edited to contain known fractions of the component, and it proved to be suitable for the analysis of images made of textured components that show large overlapping of their histograms.

关键词： Histograms image analysis image processing image segmentation image texture analysis Independent component analysis Pixel Surface texture Testing Vegetation mapping

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An interaction model for scientific visualization using sound 16

An interaction model for scientific visualization using soun...

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16th brazilian symposium on computer graphics and image processing

作者： Salvador, VCL Minghim, R Univ Sao Paulo Inst Ciencia Matemat & Comp Sao Carlos SP Brazil

ISBN: (纸本)0769520324

In scientific visualization, interaction tools allow users to navigate through volume and explore its features, helping information understanding. the use of sound as a data display tool (sonfication) has also been shown to support information understanding and may help dealing with adding dimensions to a visual display. However, thus far the issues of data exploration tools and sonfication have been treated separately by the visualization community. this paper presents an interaction model for scientific visualization that considers the main issues related to sonfication, and shows a prototype implemented to illustrate the proposed model. the prototype is a class library that implements a number of interaction tools with sonfication functions, which is freely available and can be employed in general purpose visualization applications.

关键词： computer graphics image processing Visualization

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Fast stellar mesh simplification 16

Fast stellar mesh simplification

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16th brazilian symposium on computer graphics and image processing

作者： Vieira, AW Velho, L Lopes, H Tavares, G Lewiner, T PUC Rio Lab Matmidia Rio De Janeiro Brazil

ISBN: (纸本)0769520324

this paper introduces Stellar Simplification, a fast implementation of the Four-Face Cluster algorithm. In our version of this mesh simplification scheme, we adopt a probabilistic heuristic that substitutes the priority queue of the original algorithm. this made our version, in average, 40% faster In our implementation, we adopt a very concise data structure which uses only two arrays of integers to represent the surface topology. We also introduce a new scheme,to encode and decode the hierarchy of meshes generated by the simplification algorithm. this scheme can be used for progressive transmission and compression of meshes.

关键词： Application software Clustering algorithms Computational modeling computer graphics Data structures Decoding Reconstruction algorithms Redundancy Surface reconstruction Topology

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