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

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A simple sketch for 3D scanning based on a rotating platform and a Web camera 基于旋转平台和网络摄像头的简单3D扫描草图
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167178
L. Gonçalves, George Thó, Anderson L. O. Cavalcanti
{"title":"A simple sketch for 3D scanning based on a rotating platform and a Web camera","authors":"L. Gonçalves, George Thó, Anderson L. O. Cavalcanti","doi":"10.1109/SIBGRA.2002.1167178","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167178","url":null,"abstract":"We propose a technique for 3D scanning based on a very simple device composed of a rotating platform and a cheap Web camera, both controlled by computer. Images from an object are taken under different viewing angles in a synchronized way by the camera and processed in order to allow the reconstruction of object shape in a very simple way. It works well for convex objects. Extensions to other complex objects are being studied.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"91 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":"116677260","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
Person recognition through eigeneye selection based on fuzzy distance to multiple class prototypes 基于多类原型模糊距离的特征眼选择人识别
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167179
Jishu Ashimine, T. D. Campos, R. M. C. Junior, I. Bloch
{"title":"Person recognition through eigeneye selection based on fuzzy distance to multiple class prototypes","authors":"Jishu Ashimine, T. D. Campos, R. M. C. Junior, I. Bloch","doi":"10.1109/SIBGRA.2002.1167179","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167179","url":null,"abstract":"This paper introduces a new criterion function to be used by feature selection algorithms based on fuzzy distances. Experiments using the introduced criterion function applied to the problem of face recognition are described.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"36 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":"128218822","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
Applying a visual attention mechanism to the problem of traffic sign recognition 视觉注意机制在交通标志识别中的应用
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167187
Fabrício Augusto Rodrigues, H. Gomes
{"title":"Applying a visual attention mechanism to the problem of traffic sign recognition","authors":"Fabrício Augusto Rodrigues, H. Gomes","doi":"10.1109/SIBGRA.2002.1167187","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167187","url":null,"abstract":"Driving a vehicle is a highly intensive visual information processing task in which traffic sign recognition plays an important role. Reports have shown that a great deal of the crashes at intersections and head-on collisions could be avoided if the driver had an additional half-second to react, and that inattentive drivers are the cause of most crashes. Therefore, this is an interesting field for the investigation of computer vision techniques. Within this context we are concerned with the automatic detection and classification of traffic signs in images acquired from a moving car. In order to reduce the amount of information to process, we employed a bottom-up visual attention mechanism to locate only the most promising points within each frame. Given a set of interest points, another module tries to match previously learnt traffic sign models against image regions centred on these points via a neural network approach. This paper focuses on the design aspects and preliminary results of the attention mechanism.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"20 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":"116219220","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: 2
The interpersonal and intrapersonal variability influences on off-line signature verification using HMM 人际变异性和内部变异性对HMM离线签名验证的影响
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167143
E. Justino, Flávio Bortolozzi, R. Sabourin
{"title":"The interpersonal and intrapersonal variability influences on off-line signature verification using HMM","authors":"E. Justino, Flávio Bortolozzi, R. Sabourin","doi":"10.1109/SIBGRA.2002.1167143","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167143","url":null,"abstract":"Off-line signature verification rests on the hypothesis that each writer has similarity among signature samples, with small distortion and scale variability. This kind of distortion represents intrapersonal variability. This paper reports interpersonal and intrapersonal variability influences in a software approach based on a hidden Markov model (HMM) classifier. The experiments have shown error rate variability considering different forgery types, random, simple and skilled. The mathematical approach and resulting software also report considerations in a real application problem.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"50 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":"127702099","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: 61
Filtering sparse data with 3D tensorial structuring elements 用三维张量结构元素过滤稀疏数据
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167132
M. Vieira, M. Cord, Paulo P. Martins, A. Araújo, S. Philipp-Foliguet
{"title":"Filtering sparse data with 3D tensorial structuring elements","authors":"M. Vieira, M. Cord, Paulo P. Martins, A. Araújo, S. Philipp-Foliguet","doi":"10.1109/SIBGRA.2002.1167132","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167132","url":null,"abstract":"We address the problem of filtering three-dimensional sparse data representing real objects. The main application is to eliminate points that are not structured on surfaces. Points classified as organized can be the input for other processes. An accumulation process infers the organization of each input element. The tensorial fields used in our method act as three-dimensional structuring elements. They define normal orientations in space indicating possible surface continuations.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"16 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":"125660226","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: 2
Multiscale moment-based painterly rendering 基于多尺度矩的绘画渲染
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167151
Diego F. Nehab, L. Velho
{"title":"Multiscale moment-based painterly rendering","authors":"Diego F. Nehab, L. Velho","doi":"10.1109/SIBGRA.2002.1167151","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167151","url":null,"abstract":"We present a new method for painterly rendering of images. Our method extends the image-moment stroke placement algorithm in two ways: we employ a multiscale scheme for computing strokes and we provide a parametrized mechanism for controlling stroke distribution. In addition, we present a specialized image abstraction for the algorithm.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"75 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":"115934755","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: 14
Evaluating an adaptive windowing scheme in speckle noise MAP filtering 散斑噪声MAP滤波中自适应开窗方案的评价
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167126
F. Medeiros, N. Mascarenhas, R. Marques, Cassius M. Laprano
{"title":"Evaluating an adaptive windowing scheme in speckle noise MAP filtering","authors":"F. Medeiros, N. Mascarenhas, R. Marques, Cassius M. Laprano","doi":"10.1109/SIBGRA.2002.1167126","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167126","url":null,"abstract":"Synthetic aperture radar (SAR) images are corrupted by speckle noise, which degrades the quality and interpretation of the images. Speckle removal provides a better interpretability of SAR images if the technique performs the filtering without loss of spatial resolution and preserves fine details and edges. This work aims to redefine the neighborhood areas around the noisy pixel and in this area the local mean and variance are computed to estimate the Maximum a Posteriori (MAP) filter parameters. The proposed modified MAP algorithm improves the ability to filter the speckle noise without blurring edges and targets by applying the MAP estimator in the current adaptive window that is controlled by a measure of homogeneity in the area around the noisy pixel. This adaptive windowing was also incorporated to the classical Kuan et al. (1985) and Frost et al. (1982) filters in order to evaluate the performance of the proposed scheme. The effectiveness in reducing speckle by the modified MAP filter is evaluated in terms of qualitative and quantitative aspects such as line and edge preservation and the improvement of the signal to noise ratio. The tests were performed in real SAR images.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"23 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":"131209937","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: 4
Digital technologies of learning and simulation of virtual cities: terrain editor (MAPPA) 虚拟城市学习与模拟的数字技术:地形编辑器(MAPPA)
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167198
Marcelo Laserra, Magalí-Teresinha Longhi, Margarete Axt
{"title":"Digital technologies of learning and simulation of virtual cities: terrain editor (MAPPA)","authors":"Marcelo Laserra, Magalí-Teresinha Longhi, Margarete Axt","doi":"10.1109/SIBGRA.2002.1167198","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167198","url":null,"abstract":"This poster describes a terrain editor for the CIVITAS-Cidades Virtuais: Tecnologias de Aprendizagem e Simulacao environment, to be developed by UFRGS-Universidade Federal do Rio Grande do Sul, and used at third and fourth grades of Elementary Schools of Venancio Aires Town-RS-Brasil. MAPPA has the goal of being a computational modeling tool, in terms of two and three dimensions, applied to natural terrains where will be included the rest of elements of virtual cities, in addition to the rules of the environment.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"21 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":"133533636","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
How to support collaborative modelling with the emerging standard MPEG-4 MU 如何支持新兴标准MPEG-4 MU的协作建模
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167206
F. V. Duarte, M. Verdi, R. B. Araujo
{"title":"How to support collaborative modelling with the emerging standard MPEG-4 MU","authors":"F. V. Duarte, M. Verdi, R. B. Araujo","doi":"10.1109/SIBGRA.2002.1167206","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167206","url":null,"abstract":"In a collaborative modelling environment, multiple users may interact in a virtual environment to deform or modify shared 3D objects (e.g., for modelling and visualization of virtual prototypes). The challenges to collaborative modelling are related mainly to four aspects: user interaction with the virtual modelling environment, 3D object concurrent editing, consistency maintenance among client terminals and real time rendering of the modified 3D objects. The use of Non-Uniform Rational B-Splines (NURBS) surfaces accelerates the rendering process since a small number of control points are used to represent the objects, resulting in a large data compression. Nowadays a number of technologies has either emerged or evolved to support 3D environments, such as: X3D, Java3D and MPEG-4 MU. This paper shows how the emerging MPEG-4 MU standard can be used to support real-time modelling through NURBS in a shared virtual environment among multiple client terminals.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"39 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":"123460108","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
Localization of Brazilian vehicles plates using frequency analysis 利用频率分析对巴西车辆车牌进行定位
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167180
B. Borba, C. Vasconcelos, M. Albuquerque, M. Albuquerque, I. Esquef, J. Seixas
{"title":"Localization of Brazilian vehicles plates using frequency analysis","authors":"B. Borba, C. Vasconcelos, M. Albuquerque, M. Albuquerque, I. Esquef, J. Seixas","doi":"10.1109/SIBGRA.2002.1167180","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167180","url":null,"abstract":"This work aims at the implementation of Brazilian vehicle plate localization using image processing techniques. In this paper, we show how to find the horizontal position of the plate based on its frequency characteristics in the whole vehicle image. Preliminary results show efficiencies above 96% for images in good illumination conditions.","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":"121862541","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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