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XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007)最新文献

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Multiple Mice Tracking using a Combination of Particle Filter and K-Means 结合粒子滤波和k均值的多鼠跟踪
XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007) Pub Date : 2007-10-07 DOI: 10.1109/SIBGRAPI.2007.39
W. Gonçalves, J. Monteiro, J. Silva, Bruno Brandoli Machado, H. Pistori, Valguima Odakura
{"title":"Multiple Mice Tracking using a Combination of Particle Filter and K-Means","authors":"W. Gonçalves, J. Monteiro, J. Silva, Bruno Brandoli Machado, H. Pistori, Valguima Odakura","doi":"10.1109/SIBGRAPI.2007.39","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2007.39","url":null,"abstract":"This paper presents a new approach to multiple objects tracking that combines particle filters and k-means. The approach has been tested under an important real world situation, related to pharmacological development, which has also proved to serve as an interesting ground-truth dataset provider for the evaluation of tracking algorithms. The obtained results are then compared to other models. The promising results of these experiments are presented.","PeriodicalId":434632,"journal":{"name":"XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121149315","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: 23
Data Hiding for Binary Documents Robust to Print-Scan, Photocopy and Geometric Distortions 对打印扫描、复印和几何扭曲具有鲁棒性的二进制文件的数据隐藏
XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007) Pub Date : 2007-10-07 DOI: 10.1109/SIBGRAPI.2007.31
H. Y. Kim, J. Mayer
{"title":"Data Hiding for Binary Documents Robust to Print-Scan, Photocopy and Geometric Distortions","authors":"H. Y. Kim, J. Mayer","doi":"10.1109/SIBGRAPI.2007.31","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2007.31","url":null,"abstract":"This paper presents a data hiding technique for printed bicolor documents. It inserts tiny dots, hardly noticeable at normal reading distance, to embed the message. For message extraction, we employ autocorrelation and tiny registration dots to rectify geometric distortions. This technique is robust to distortions resulting from print-scan operations, good quality photocopies, affine transformations and scribblings/stains on the paper. The technique can be applied to documents with large white (or black) areas and they may present characters, drawings, schematics, diagrams, cartoons, but not halftones. The technique is intended to be neither a robust watermark (because any filtering can remove the dots) nor a covert communication (because the dots are perceptible at short distance). Nevertheless, when combined with a perceptual hashing and a cryptography protocol, it can be applied as semi-fragile authentication watermarking for hardcopy two-tone documents. In some situations, the utilization of the proposed system can substitute the use of notarial authenticated photocopies.","PeriodicalId":434632,"journal":{"name":"XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114419382","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: 16
Message in a Bottle: Stylized Rendering of Sand Movies 瓶中的信息:风格化渲染的沙电影
XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007) Pub Date : 2007-10-07 DOI: 10.1109/SIBGRAPI.2007.32
L. Neto, B. Carvalho
{"title":"Message in a Bottle: Stylized Rendering of Sand Movies","authors":"L. Neto, B. Carvalho","doi":"10.1109/SIBGRAPI.2007.32","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2007.32","url":null,"abstract":"Stylized rendering, usually referred as non-photorealistic rendering, aims to reproduce artistic techniques in renderings, trying to express feelings and moods on the rendered scenes, as opposed to realistic rendering techniques, that aim to produce realistic renderings of artificial scenes. In this paper, we present a stylized rendering technique that aims to create synthetic sand-filled bottles, simulating a typical art craft from the northeastern region of Brazil, that usually depicts landscape images. A method for generating 2D procedural sand textures is presented, and two new techniques that mimic effects created by the artists using their tools are introduced. The technique is also used to generate stylized videos, something close to impossible in real life with this technique. The temporal coherence within these stylized videos can be enforced on individual objects with the aid of a video segmentation algorithm. The techniques were used on synthetic and real videos, and several snapshots from these videos are shown here.","PeriodicalId":434632,"journal":{"name":"XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125734378","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
Automatic Eye Localization in Color Images 彩色图像中的自动眼睛定位
XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007) Pub Date : 2007-10-07 DOI: 10.1109/SIBGRAPI.2007.13
José Gilvan Rodrigues Maia, Fernando de Carvalho Gomes, Osvaldo de Souza
{"title":"Automatic Eye Localization in Color Images","authors":"José Gilvan Rodrigues Maia, Fernando de Carvalho Gomes, Osvaldo de Souza","doi":"10.1109/SIBGRAPI.2007.13","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2007.13","url":null,"abstract":"In this paper, we present a new efficient method for accurate eye localization in color images. Our algorithm is based on robust feature filtering and explicit geometric clustering. This combination enhances localization speed and robustness by relying on geometric relationships between pixel clusters instead of other properties extracted from the image. Furthermore, its efficiency makes it well suited for implementation in low performance devices, such as cell phones and PDAs. Experiments were conducted with 1532 face images taken from a CCD camera under (real-life) varying illumination, pose and expression conditions. The proposed method presented a localization rate of 94.125% under such circumstances.","PeriodicalId":434632,"journal":{"name":"XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128732564","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
Multiresolution Elastic Medical Image Registration in Standard Intensity Scale 标准强度尺度下的多分辨率弹性医学图像配准
XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007) Pub Date : 2007-10-07 DOI: 10.1109/SIU.2008.4632564
Ulas Bagci, L. Bai
{"title":"Multiresolution Elastic Medical Image Registration in Standard Intensity Scale","authors":"Ulas Bagci, L. Bai","doi":"10.1109/SIU.2008.4632564","DOIUrl":"https://doi.org/10.1109/SIU.2008.4632564","url":null,"abstract":"Medical image registration is a difficult problem. Not only a registration algorithm needs to capture both large and small scale image deformations, it also has to deal with global and local image intensity variations. In this paper we describe a new multiresolution elastic image registration method that challenges these difficulties in image registration. To capture large and small scale image deformations, we use both global and local affine transformation algorithms. To address global and local image intensity variations, we apply an image intensity standardization algorithm to correct image intensity variations. This transforms image intensities into a standard intensity scale, which allows highly accurate registration of medical images.","PeriodicalId":434632,"journal":{"name":"XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121361147","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: 18
3D Atlas Building in the Context of Head and Neck Radiotherapy Based on Dense Deformation Fields 基于密集变形场的头颈部放射治疗三维图谱构建
XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007) Pub Date : 2007-10-07 DOI: 10.1109/SIBGRAPI.2007.23
Adriane Parraga, A. Susin, J. Pettersson, B. Macq, M. D. Craene
{"title":"3D Atlas Building in the Context of Head and Neck Radiotherapy Based on Dense Deformation Fields","authors":"Adriane Parraga, A. Susin, J. Pettersson, B. Macq, M. D. Craene","doi":"10.1109/SIBGRAPI.2007.23","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2007.23","url":null,"abstract":"In this paper we present a methodology to build a computational anatomical atlas based on the analysis of dense deformation fields recovered by the Morphons non-rigid registration algorithm. The anatomical atlas construction procedure is based on the minimization of the effort required to register the whole database to a reference. The suitability of our method is demonstrated for atlas construction of the head and neck anatomy. In this application, CT is the most frequently used modality for the segmentation of organs at risk and clinical target volume. One challenge brought by the use of CT images is the presence of important artefacts caused by dental implants. Such artefacts make the use of most atlas building techniques described in the literature impracticable in this context. The results have shown that our model is faithful for representing the shape variability presented in human nature with the advantage that our anatomical atlas does not have any degree of smoothness.","PeriodicalId":434632,"journal":{"name":"XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127955253","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
Interactive 3D ScanningWithout Tracking 无需跟踪的交互式3D扫描
XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007) Pub Date : 2007-10-07 DOI: 10.1109/SIBGRAPI.2007.26
Matthew J. Leotta, Austin Vandergon, G. Taubin
{"title":"Interactive 3D ScanningWithout Tracking","authors":"Matthew J. Leotta, Austin Vandergon, G. Taubin","doi":"10.1109/SIBGRAPI.2007.26","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2007.26","url":null,"abstract":"Using inexpensive and readily available materials-a calibrated pair of cameras and a laser line projector - a 3D laser range scanner which requires no tracking is implemented in this paper. We introduce a planarity constraint for reconstruction, based on the fact that all points observed on a laser line in an image are on the same plane of laser light in 3D. This plane of laser light linearly parametrizes the homography between a pair of images of the same laser line, and this homography can be recovered from point correspondences derived from epipolar geometry. Points visible from multiple views can be reconstructed via triangulation and projected onto this plane, while points visible in only one view can be recovered via ray-plane intersection. The use of the planarity constraint during reconstruction increases the system's accuracy, and using the planes for reconstruction increases the number of points recovered. Additionally, an in teractive scanning environment is constructed, where incremental reconstruction is used to provide continuous visual feedback. Reconstructions with this method are shown to have higher accuracy than standard triangulation.","PeriodicalId":434632,"journal":{"name":"XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007)","volume":"36 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124511500","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: 19
Multilayer Perceptron Classifier Combination for Identification of Materials on Noisy Soil Science Multispectral Images 基于多层感知器分类器的土壤科学多光谱图像材料识别
XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007) Pub Date : 2007-10-07 DOI: 10.1109/SIBGRAPI.2007.10
Fabricio A. Breve, M. Ponti, N. Mascarenhas
{"title":"Multilayer Perceptron Classifier Combination for Identification of Materials on Noisy Soil Science Multispectral Images","authors":"Fabricio A. Breve, M. Ponti, N. Mascarenhas","doi":"10.1109/SIBGRAPI.2007.10","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2007.10","url":null,"abstract":"Classifier combination experiments using the multilayer perceptron (MLP) were carried out using noisy soil science multispectral images, which were obtained using a tomograph scanner. Using few units in the MLP hidden layer, images were classified using a single classifier. Later we used classifier combining techniques as bagging, decision templates (DT) and Dempster-Shafer (DS), in order to improve the performance of the single classifiers and also stabilize the performance of the multilayer perceptron. The classification results were evaluated using cross-validation. The results showed stabilization of Multilayer Perceptron and improved results were achieved with fewer units in the MLP hidden layer.","PeriodicalId":434632,"journal":{"name":"XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125695645","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: 16
Application-independent accurate mouse placements on surfaces of arbitrary geometry 应用程序独立的精确鼠标放置在任意几何形状的表面上
XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007) Pub Date : 2007-10-07 DOI: 10.1109/SIBGRAPI.2007.12
H. C. Batagelo, Shin-Ting Wu
{"title":"Application-independent accurate mouse placements on surfaces of arbitrary geometry","authors":"H. C. Batagelo, Shin-Ting Wu","doi":"10.1109/SIBGRAPI.2007.12","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2007.12","url":null,"abstract":"Most direct manipulation tasks rely on precise placements of the cursor on the object of interest. Commonly, this requires the knowledge of distinct application-dependent geometry attributes of this object computed on the CPU. In this work, we present a simple yet general GPU-based framework for computing such attributes without depending on application-specific algorithms. In particular, it provides, for each pixel of the rendered model, elements of discrete differential geometry that require only the vertex data and 1-ring connectivity of each vertex stored in video memory. We validate our framework by showing how, only by providing correct mouse placements even when the geometry is modified on GPU, it can support the implementation of many direct manipulation tasks presented on the literature. Implementation results are presented.","PeriodicalId":434632,"journal":{"name":"XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131918698","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: 25
A Simple Framework for Natural Animation of Digitized Models 数字化模型自然动画的简单框架
XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007) Pub Date : 2007-10-07 DOI: 10.1109/SIBGRAPI.2007.14
Edilson de Aguiar, Rhaleb Zayer, C. Theobalt, H. Seidel, M. Magnor
{"title":"A Simple Framework for Natural Animation of Digitized Models","authors":"Edilson de Aguiar, Rhaleb Zayer, C. Theobalt, H. Seidel, M. Magnor","doi":"10.1109/SIBGRAPI.2007.14","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2007.14","url":null,"abstract":"We present a versatile, fast and simple framework to generate animations of scanned human characters from input optical motion capture data. Our method is purely mesh- based and requires only a minimum of manual interaction. The only manual step needed to create moving virtual people is the placement of a sparse set of correspondences between the input data and the mesh to be animated. The proposed algorithm implicitly generates realistic body deformations, and can easily transfer motions between human subjects of completely different shape and proportions. We feature a working prototype system that demonstrates that our method can generate convincing lifelike character animations directly from optical motion capture data.","PeriodicalId":434632,"journal":{"name":"XX Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2007)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128937951","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
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