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检索条件"任意字段=16th Brazilian Symposium on Computer Graphics and Image Processing"

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Graphic simulation for virtual prototyping with JAVA3D 16

Graphic simulation for virtual prototyping with JAVA3D

引用

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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Area fractions by linear analysis of intensity level histograms 16

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

引用

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...

引用

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

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

引用

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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Corresponding geometric distorted images using an uncertainty inference method 16

Corresponding geometric distorted images using an uncertaint...

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16th brazilian symposium on computer graphics and image processing

作者： da Silva, JDS Simoni, PO INPE BR-12227010 Sao Jose Dos Campos Brazil

ISBN: (纸本)0769520324

In this paper we present further results of the application of Dempster-Shafer theory for uncertainty reasoning in corresponding distorted images in computer Vision. In a previous work [12], the model was applied to correspond radiometrically distorted images, that is, images with differences in brightness and contrast, as an extension of the work developed in [I I]. the results showed the model is robust when dealing with pairs of non-equalized images and encouraged its to try to correspond geometric distorted images, that is, pairs of images in which one is rotated in relation to the other. In the conducted experiments, the right image was rotated by different angles to simulate the desired geometric distortions. the model was applied to a pair of rotated images and it successfully established the correspondence of a pair of points. As in previous works, the correspondence evidences are based on the contextual and structural features of the points and their combination is performed Dempster-Shafer's rule of combination for uncertainty reasoning. A search process maximizes the Belief on the combined evidences.

关键词： computer graphics image processing Uncertainty

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A novel photometric motion approach 16

A novel photometric motion approach

引用

16th brazilian symposium on computer graphics and image processing

作者： Torreao, JRA Fernandes, JL Leitao, HCG Pontificia Univ Catolica Parana Posgrad Informat Aplicada BR-80215901 Curitiba Parana Brazil

ISBN: (纸本)0769520324

Photometric motion is a computer vision process for the estimation of shape from image sequences of dynamic scenes. It was introduced by Pentland, based on his observation that the photometric effects of motion - the intensity change of a moving point - could dominate the purely geometric ones, due to projective distortion. Here we present a novel formulation for the same shape estimation problem, whose distinctive feature is that of being based on the irradiance change, due to the motion, at a given point in the image plane, and not, as in the original proposal, at a fixed location on the moving surface. thus we obtain an easily implementable procedure which yields good-quality estimates, and which can be extended to single-input shape reconstruction.

关键词： computer vision image reconstruction image sequences Layout Motion estimation Photometry Proposals Shape Surface reconstruction Yield estimation

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A sketch-based collaborative design system 16

A sketch-based collaborative design system

引用

16th brazilian symposium on computer graphics and image processing

作者： Fan, Z Chi, M Oliveira, MM SUNY Stony Brook Dept Comp Sci Stony Brook NY 11794 USA

ISBN: (纸本)0769520324

We present a system for collaborative conceptual design that allows users potentially located in geographically distant areas to cooperate by sketching, exploring and modifying their ideas interactively, with immediate visual feedback. the system supports several modeling primitives and can be easily extended with user-defined objects. In this context, we introduce the notions of animated and sketchy billboards. Applications of this system include early stages of urban and landscape design, rapid prototype of virtual environments, animation, education and recreational use.

关键词： Animation Buildings Collaboration Collaborative work computer science Feedback Shape Space exploration Virtual environment Virtual prototyping

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Design of order statistic filters from examples 16

Design of order statistic filters from examples

引用

16th brazilian symposium on computer graphics and image processing

作者： Hirata, NST Hirata, R USP Dept Comp Sci IME BR-05508090 Sao Paulo Brazil

ISBN: (纸本)0769520324

Order statistic filters form a subclass of the stack filters. the design of stack filters is computationally prohibitive for relatively large windows. A possible approach to overcome this difficulty is to constrain design to a smaller class. We propose an algorithm for the design of optimal order statistic filters from training data, and show how it can also be applied to the design of optimal weighted order statistic filters. Some examples that illustrate application of the proposed algorithm are presented, with considerations on training time and precision of the designed filter.

关键词： Algorithm design and analysis Boolean functions computer science Educational institutions Filters Hamming weight Signal mapping Sorting Statistics Training data

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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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