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Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing最新文献

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Boolean decomposition of binary image operators 二值图像算子的布尔分解
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167160
H. M. Madeira, H. Pedrini
{"title":"Boolean decomposition of binary image operators","authors":"H. M. Madeira, H. Pedrini","doi":"10.1109/SIBGRA.2002.1167160","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167160","url":null,"abstract":"Boolean expansion of binary functions has been used in the representation of binary image operators. This representation scheme induced the creation of image processing architectures based on decision diagrams. In some situations, the application of this graph-based operator over the input images is faster than the corresponding conventional approach, in that the operators are constructively described by means of basic operators and set operations. However, when the conventional architecture exploits the bit parallelism of the microprocessor logical instructions, its performance often surpasses that of the graph-based system. This article proposes a novel approach, in which the decision diagrams guide the actions of the underlying conventional architecture, taking advantage of its parallelism, so that faster image processing can be achieved.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129544055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Navegador3D: an Internet based flight simulator of urban centers Navegador3D:一个基于互联网的城市中心飞行模拟器
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167202
M. Vieira, A. Araújo, S. Philipp-Foliguet, M. Cord, M. Jordan, J. Grillo
{"title":"Navegador3D: an Internet based flight simulator of urban centers","authors":"M. Vieira, A. Araújo, S. Philipp-Foliguet, M. Cord, M. Jordan, J. Grillo","doi":"10.1109/SIBGRA.2002.1167202","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167202","url":null,"abstract":"Nowadays several areas of application need a precise 3D cartographic model, specially in the urban domain: telecommunications, urbanism, tourism and other ludicrous applications. The analysis of aerial stereoscopic photos provides a fast method to obtain a faithful relief of the observed scene, including its superstructures. This work presents the Navegador3D developed by NPD/UFMG, ETIS/ENSEA and Vist@erea/INFOSTRATA.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133694176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Smart visible sets for networked virtual environments 用于网络虚拟环境的智能可视设备
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167168
Fábio O. Moreira, J. Comba, C. Freitas
{"title":"Smart visible sets for networked virtual environments","authors":"Fábio O. Moreira, J. Comba, C. Freitas","doi":"10.1109/SIBGRA.2002.1167168","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167168","url":null,"abstract":"The real-time visualization of complex virtual environments across a network is a challenging problem in computer graphics. The use of pre-computed visibility associated to regions in space, such as in the potentially visible sets (PVS) approach, may reduce the amount of data sent across the network. However, PVS for a region may still be complex, and further partitions are necessary. In this paper we introduce the concept of a smart visible set (SVS), which corresponds to (1) a partition of PVS information into dynamic subsets that take into account client position, and (2) an ordering mechanism that enumerates these dynamic sets using a visual importance metric. Results comparing the SVS and PVS approach are presented.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123864908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
A color-based retrieval system for images collected on the World Wide Web 一种基于颜色的检索系统，用于在万维网上收集图像
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167181
Camillo Jorge Santos Oliveira, A. Araújo, Daniel Ribeiro Gomes, C. A. Severiano
{"title":"A color-based retrieval system for images collected on the World Wide Web","authors":"Camillo Jorge Santos Oliveira, A. Araújo, Daniel Ribeiro Gomes, C. A. Severiano","doi":"10.1109/SIBGRA.2002.1167181","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167181","url":null,"abstract":"This work presents a prototype system for color-based retrieval of images collected on the Web. The images collected are classified in two semantic classes (photographs and graphics) but only photographs are indexed. It basically stores information about regions with the same color in the image (chromatic regions), such as size, position and boundaries with other regions. This data representation is made using histogram variations of the image as graphs: the modified color adjacency graph (MCAG) and the variance graph (SVG). Image retrieval is done by applying a similar metric based on a comparison of the graphs.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"928 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116422412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The abalone interpolation: a visual interpolation procedure for the calculation of cloud movement 鲍鱼插值:云运动计算的可视化插值程序
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167169
Elke Hergenröther, A. Bleile, D. Middleton, Andrzej Trembilski
{"title":"The abalone interpolation: a visual interpolation procedure for the calculation of cloud movement","authors":"Elke Hergenröther, A. Bleile, D. Middleton, Andrzej Trembilski","doi":"10.1109/SIBGRA.2002.1167169","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167169","url":null,"abstract":"For the production of smooth animation of flow simulation from several data steps many interpolated intermediate data steps are needed. Such interpolations are especially important for the meteorological visualization of moving clouds for TV broadcasting purposes. The traditional method for the animation production is to fade out one dataset and fade in the next. The visual result is not very realistic if the clouds should move quickly and the distances between them are too great, because blending produces no clouds movements. In this paper we present abalone interpolation for the calculation of visually realistic cloud movements. The presented solution is not only suitable for meteorological visualization but also for visual preparation of flow calculation results.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128525829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
A neural approach to classification of satellite images 卫星图像分类的神经方法
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167185
Viviane Todt Diverio, A. T. Gómez, F. Osório, L. T. Hoffmann, António Gabriel Rodrigues
{"title":"A neural approach to classification of satellite images","authors":"Viviane Todt Diverio, A. T. Gómez, F. Osório, L. T. Hoffmann, António Gabriel Rodrigues","doi":"10.1109/SIBGRA.2002.1167185","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167185","url":null,"abstract":"This paper shows the results obtained using a traditional statistical method (Gaussian Maximum Likelihood) and artificial neural networks (backpropagation and cascade-correlation) applied to multispectral Landsat Thematic Mapper data classification. The studied images cover a region situated in Rio Grande do Sul State Brazil.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129790535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Classification of microstructures by morphological analysis and estimation of the hydration degree of cement paste in concrete 水泥浆体在混凝土中的水化程度及形态分析的微观结构分类
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167136
Alexandre L. Gonçalves, R. Lotufo, F. C. Flores
{"title":"Classification of microstructures by morphological analysis and estimation of the hydration degree of cement paste in concrete","authors":"Alexandre L. Gonçalves, R. Lotufo, F. C. Flores","doi":"10.1109/SIBGRA.2002.1167136","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167136","url":null,"abstract":"Cement is an essential material for the development of the civil construction. The analysis of cement-based materials is useful in the evaluation of mechanical properties, water absorption, air permeability and evolution of hydration degree. The latter is the motivation of this paper. New advantageous techniques of analysis based on the image information are possible using electronic microscopy. We propose here an alternative procedure to the segmentation of microstructures of cement and aggregates in concrete. The central idea consists of a particular use of the morphological operator watershed. We report the results of the analysis of about 450 scanning electron microscope (SEM) images.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121087295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Minute feature analysis in speckled imagery 斑点图像的微小特征分析
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167165
A. Frery, Francisco Cribari‐Neto, M. D. O. Souza
{"title":"Minute feature analysis in speckled imagery","authors":"A. Frery, Francisco Cribari‐Neto, M. D. O. Souza","doi":"10.1109/SIBGRA.2002.1167165","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167165","url":null,"abstract":"This paper tackles the problem of estimating the parameters of relevant distributions that describe speckled imagery. Speckle noise appears in data obtained with coherent illumination, as is the case of sonar, laser, ultrasound-B and synthetic aperture radar images. This noise is non-Gaussian and non-additive and, therefore, classical techniques of processing and analysis may fail. A universal parametric statistical model has been proposed for such data, and numerical issues arise when estimating its parameters. In particular, the usual techniques for optimization and for solving systems of non-linear equations often fail to converge and/or to produce acceptable results, specially when dealing with small samples. An alternated method is proposed and assessed, and it is shown to produce sensible results. As an application, real and simulated data are analyzed. We show that the discrimination of minute features in synthetic aperture radar images can be performed using the proposed procedure.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125791837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Edugraph: software to teach computer graphics concepts Edugraph:教授计算机图形学概念的软件
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 1900-01-01 DOI: 10.1109/SIBGRA.2002.1167197
A. Luiz Battaiola, N. Chamel Elias, R. de Godoy Domingues
{"title":"Edugraph: software to teach computer graphics concepts","authors":"A. Luiz Battaiola, N. Chamel Elias, R. de Godoy Domingues","doi":"10.1109/SIBGRA.2002.1167197","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167197","url":null,"abstract":"Computational processing capacity allows the development of sophisticated interactive animation with different kinds of media resources. Computer games are examples of multimedia software with entertainment and high sophistication characteristics. Such technology allied with cognitive concepts can be used to implement educational software. This poster describes the implementation of a software to teach computer graphics concepts based on entertainment and cognitive criteria.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"09 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125071615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Wavelet-based compared to function-based on-line signature verification 基于小波的在线签名验证与基于函数的在线签名验证比较
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 1900-01-01 DOI: 10.1109/SIBGRA.2002.1167146
A. Vergara da Silva, D. Santana de Freitas
{"title":"Wavelet-based compared to function-based on-line signature verification","authors":"A. Vergara da Silva, D. Santana de Freitas","doi":"10.1109/SIBGRA.2002.1167146","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167146","url":null,"abstract":"We implemented two direct methods for on-line signature verification. First, data produced by a graphics tablet describing a signature to be tested are treated with wavelet transforms to generate features to be nonlinearly confronted with a reference signature chosen among 10 previously stored from the same writer. In order to recover the time dependence lost in the wavelet treatment, we included the level of departure from the diagonal line in the warping function as a complementary measure of distance. In a second approach, the functions x(t) and y(t) describing position in time of each pixel of the same test signature were directly (though nonlinearly) compared to their counterparts from the reference. We concluded that both approaches showed good fidelity to all details in the signatures, with acceptable false rejection rates (we obtained around 30% FRR) to this kind of biometry. On the other hand, the inclusion of the wavelet transform turned out to be an essential step for the achievement of low false acceptance rates. It was only with the inclusion of the wavelet transform, at the right level of resolution, that we managed to completely prevent trained forgeries to be accepted (0% FAR) in the cases studied.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131128707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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