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

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Human-perception handwritten character recognition using wavelets 基于小波的人类感知手写字符识别
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167176
Suzete E. N. Correia, J. Carvalho, R. Sabourin
{"title":"Human-perception handwritten character recognition using wavelets","authors":"Suzete E. N. Correia, J. Carvalho, R. Sabourin","doi":"10.1109/SIBGRA.2002.1167176","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167176","url":null,"abstract":"The human vision system effortlessly recognizes familiar shapes despite changes and distortions found in retinal images. This work proposes a novel approach for recognition of handwritten characters based on human perception. The wavelet transform is used to simulate the multiresolutional capability of vision and to extract features such as fixation points and image details in horizontal, vertical and diagonal directions. A previous system which uses wavelet directional features yielded a recognition rate of 98.25% using the NIST numerals database.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"985 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":"116448141","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
Automatic method for assessment of telangiectasia degreeing by mathematical morphology 用数学形态学自动评定毛细血管扩张程度的方法
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167138
F. C. Flores, R. Lotufo, Stela Isernhagen, Leonardo M. Rocha, Alexandre G. Silva, E. Rocha
{"title":"Automatic method for assessment of telangiectasia degreeing by mathematical morphology","authors":"F. C. Flores, R. Lotufo, Stela Isernhagen, Leonardo M. Rocha, Alexandre G. Silva, E. Rocha","doi":"10.1109/SIBGRA.2002.1167138","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167138","url":null,"abstract":"This paper presents an automatic method to assess telangiectasia degreeing, by estimating the reduction of the varicose area from pre to post-treatment using digital image analysis techniques. First both images are geometrically transformed and color space reduced, in order to make them suitable for processing. Next, the varicose veins are segmented via watershed transform and the varicose areas in both images are detected. Finally, the assessment degreeing is done. The method was applied to twenty patients and the results were very consistent, according to the analysis of six vascular specialists.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"62 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":"116489497","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
Beta-connection: an approach to generate families of models from planar sections β连接:一种从平面剖面生成模型族的方法
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167142
A. Cuadros-Vargas, L. G. Nonato, R. Minghim, Maria Cristina Ferreira de Oliveira
{"title":"Beta-connection: an approach to generate families of models from planar sections","authors":"A. Cuadros-Vargas, L. G. Nonato, R. Minghim, Maria Cristina Ferreira de Oliveira","doi":"10.1109/SIBGRA.2002.1167142","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167142","url":null,"abstract":"A new three-dimensional reconstruction technique is presented that uses an integer control parameter, denoted /spl beta/, to produce a family of models from a given set of planar cross-sections. Parameter /spl beta/ supports multiple choices for solving the correspondence problem, i.e., the problem of deciding which regions from two consecutive cross-sections must be connected into a single component. Thus, unlike current reconstruction methods, the beta-connection algorithm enables the consideration of multiple alternatives when establishing region correspondence. In addition to this flexibility, which is useful in creating models with complex topologies, the algorithm produces PL-manifolds and respects the re-sampling condition, thus providing an interesting reconstruction solution for many practical visualization and numerical simulation applications.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"31 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":"132248218","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
A multimedia information system for administrative, scientific and intervention data in conservation-restoration of cultural movable properties 一个用于文物保护修复管理、科学和干预数据的多媒体信息系统
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167186
Flávio H. C. Nunes, Luiz A. C. Souza, A. Araújo, Marcelo A. Correa
{"title":"A multimedia information system for administrative, scientific and intervention data in conservation-restoration of cultural movable properties","authors":"Flávio H. C. Nunes, Luiz A. C. Souza, A. Araújo, Marcelo A. Correa","doi":"10.1109/SIBGRA.2002.1167186","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167186","url":null,"abstract":"This paper describes the process of modelling and implementing a multimedia information system for CECOR-Center for Conservation and Restoration of Cultural Movable Properties. The new system includes a multimedia system which contains information about the restored objects, their materials and techniques, images generated by methods of diagnosis, results of scientific analysis, etc. The new system also includes administrative information about the contacts with the clients, payments and the current status of the object, regarding its restoration process.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"32 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":"133917614","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
Nonextensive entropic image thresholding 非扩展熵图像阈值
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167174
I. Esquef, M. Albuquerque, M. Albuquerque
{"title":"Nonextensive entropic image thresholding","authors":"I. Esquef, M. Albuquerque, M. Albuquerque","doi":"10.1109/SIBGRA.2002.1167174","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167174","url":null,"abstract":"In image processing, one of the most efficient techniques for image segmentation is entropy-based thresholding. In this work a generalized entropy formalism that represents a recent development in statistical mechanics was applied. We propose, for the first time, an image thresholding method using a nonextensive entropy regarding the presence of nonadditive information content in image classes. Preliminary results are shown.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"122 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":"134120194","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
Dynamic scene occlusion culling using a regular grid 使用规则网格的动态场景遮挡剔除
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167122
H. C. Batagelo, Shin-Ting Wu
{"title":"Dynamic scene occlusion culling using a regular grid","authors":"H. C. Batagelo, Shin-Ting Wu","doi":"10.1109/SIBGRA.2002.1167122","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167122","url":null,"abstract":"We present an output-sensitive occlusion culling algorithm for densely occluded dynamic scenes where both the viewpoint and objects move arbitrarily. Our method works on a regular grid that represents a volumetric discretization of the space and uses the opaque regions of the scene as virtual occluders. We introduce new techniques of efficient traversal of voxels, object discretization and occlusion computation that strengthen the benefits of regular grids in dynamic scenes. The method also exploits temporal coherence and realizes occluder fusion in object-space. For each frame, the algorithm computes a conservative set of visible objects that greatly accelerates the visualization of complex dynamic scenes. We discuss the results of a 2D and 3D case implementation.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"183 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":"126074002","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: 20
Modeling and rendering of individual feathers 单个羽毛的建模和渲染
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167157
C. J. Franco, M. Walter
{"title":"Modeling and rendering of individual feathers","authors":"C. J. Franco, M. Walter","doi":"10.1109/SIBGRA.2002.1167157","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167157","url":null,"abstract":"We present a model for geometric modeling and rendering of individual feathers for computer graphics purposes. The model represents feather structure with a collection of parameterized Bezier curves. This parametrization allows easy generation of the existent types of feather structures with biologically-motivated parameters. Once the feather structure is defined, feathers can be rendered either in a non-photorealistic rendering style or using texture mapping to achieve a more natural look.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"5 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":"122537977","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: 8
Substructural segmentation based on regional shape differences 基于区域形状差异的子结构分割
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167117
A. Machado, J. Gee, M. Campos
{"title":"Substructural segmentation based on regional shape differences","authors":"A. Machado, J. Gee, M. Campos","doi":"10.1109/SIBGRA.2002.1167117","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167117","url":null,"abstract":"This article presents a method for the segmentation of substructures based on exploratory factor analysis. In this approach, a set of high-dimensional shape-related variables is examined with the purpose of finding clusters with strong correlation. This clustering can potentially identify regions that have anatomic significance and thus lend insight to morphometric investigations.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"45 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":"124946455","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
Three-dimensional reconstruction of urban scenes from a single image 从单幅图像三维重建城市场景
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167200
F. Policarpo, E. Azevedo, A. Conci
{"title":"Three-dimensional reconstruction of urban scenes from a single image","authors":"F. Policarpo, E. Azevedo, A. Conci","doi":"10.1109/SIBGRA.2002.1167200","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167200","url":null,"abstract":"This work presents a method to output the 3D structure of an urban area from only one aerial photo. The reconstruction is based on the inverse process done when a parallel projection is used to construct a two-dimensional image from a three-dimensional object. A new algorithm for reconstruction is developed and implemented. It recovers depth information by identification of object height on the image plane. While the 3D-objects are reconstructed, their original texture is used for rendering, using control points defined by the user. Results show that when seen from the same capture angle, the virtual 3D scene and the original picture are exactly the same. In the virtual environment of this implementation, the user can visualize, visit and interact with the structure of the 3D scenario. The spatial structure of the real world is recovered at real time; it is possible to see the 3D growing out of the 2D images.","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":"129005351","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
A directional and parametrized transition detection algorithm based on morphological residues 一种基于形态残数的定向参数化过渡检测算法
Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167153
S. Guimarães, N. J. Leite, M. Couprie, A. Araújo
{"title":"A directional and parametrized transition detection algorithm based on morphological residues","authors":"S. Guimarães, N. J. Leite, M. Couprie, A. Araújo","doi":"10.1109/SIBGRA.2002.1167153","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167153","url":null,"abstract":"The boundary identification represents an interesting and difficult problem in image processing, mainly if two flat zones are separated by a gradual transition. The most common operators work very well for sharp edges, but fail for gradual transitions. In this work, we have done a characterization for gradient by a study of the opening residues. This characterization is useful to identify and classify sharp and gradual transitions between two consecutive flat zones according to a size criterion.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"44 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":"128366413","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
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