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2006 19th Brazilian Symposium on Computer Graphics and Image Processing最新文献

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GPU-Based Cell Projection for Interactive Volume Rendering 基于gpu的交互式体绘制单元投影
2006 19th Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2006-12-11 DOI: 10.1109/SIBGRAPI.2006.22
R. Marroquim, André Maximo, R. Farias, Claudio Esperança
{"title":"GPU-Based Cell Projection for Interactive Volume Rendering","authors":"R. Marroquim, André Maximo, R. Farias, Claudio Esperança","doi":"10.1109/SIBGRAPI.2006.22","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2006.22","url":null,"abstract":"We present a practical approach for implementing the projected tetrahedra (PT) algorithm for interactive volume rendering of unstructured data using programmable graphics cards. Unlike similar works reported earlier, our method employs two fragment shaders, one for computing the tetrahedra projections and another for rendering the elements. We achieve interactive rates by storing the model in texture memory and avoiding redundant projections of implementations using vertex shaders. Our algorithm is capable of rendering over 2.0 M Tet/s on current graphics hardware, making it competitive with recent ray-casting approaches, while occupying a substantially smaller memory footprint","PeriodicalId":253871,"journal":{"name":"2006 19th Brazilian Symposium on Computer Graphics and Image Processing","volume":"9 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115728531","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
A Computer-Assisted Colorization Algorithm based on Topological Difference 一种基于拓扑差分的计算机辅助着色算法
2006 19th Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2006-12-11 DOI: 10.1109/SIBGRAPI.2006.1
Hedlena Bezerra, B. Feijó, L. Velho
{"title":"A Computer-Assisted Colorization Algorithm based on Topological Difference","authors":"Hedlena Bezerra, B. Feijó, L. Velho","doi":"10.1109/SIBGRAPI.2006.1","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2006.1","url":null,"abstract":"Region-based approaches to cel painting typically use shape similarity and topology relations between regions of consecutive animation frames. This paper presents a new colorization algorithm based on topological differences defined over a hierarchical graph of adjacent regions, which allows an almost full automatic colorization process. Also this paper discusses other attributes that improve the solution of the image association problem","PeriodicalId":253871,"journal":{"name":"2006 19th Brazilian Symposium on Computer Graphics and Image Processing","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124275976","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
Dealing with Multi-Scale Depth Changes and Motion in Depth Edge Detection 深度边缘检测中多尺度深度变化与运动的处理
2006 19th Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2006-12-11 DOI: 10.1109/SIBGRAPI.2006.10
R. Feris, M. Turk, R. Raskar
{"title":"Dealing with Multi-Scale Depth Changes and Motion in Depth Edge Detection","authors":"R. Feris, M. Turk, R. Raskar","doi":"10.1109/SIBGRAPI.2006.10","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2006.10","url":null,"abstract":"Sharp discontinuities in depth, or depth edges, are very important low-level features for scene understanding. Recently, we have proposed a solution to the depth edge detection problem using a simple modification of the capture setup: a multi-flash camera with flashes appropriately positioned to cast shadows along depth discontinuities in the scene. In this paper, we show that by varying illumination parameters, such as the number, spatial position, and wavelength of light sources, we are able to handle fundamental problems in depth edge detection, including multi-scale depth changes and motion. The robustness of our methods is demonstrated through our experimental results in complex scenes","PeriodicalId":253871,"journal":{"name":"2006 19th Brazilian Symposium on Computer Graphics and Image Processing","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122815082","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
Particle-based non-Newtonian fluid animation for melting objects 熔化物体的基于粒子的非牛顿流体动画
2006 19th Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2006-12-11 DOI: 10.1109/SIBGRAPI.2006.33
Afonso Paiva, Fabiano Petronetto, T. Lewiner, G. Tavares
{"title":"Particle-based non-Newtonian fluid animation for melting objects","authors":"Afonso Paiva, Fabiano Petronetto, T. Lewiner, G. Tavares","doi":"10.1109/SIBGRAPI.2006.33","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2006.33","url":null,"abstract":"This paper presents a new visually realistic animation technique for objects that melt and flow. It simulates viscoplastic properties of materials such as metal, plastic, wax, polymer and lava. The technique consists in modeling the object by the transition of a non-Newtonian fluid with high viscosity to a liquid of low viscosity. During the melting, the viscosity is formulated using the general Newtonian fluids model, whose properties depend on the local temperature. The phase transition is then driven by the heat equation. The fluid simulation framework uses a variation of the Lagrangian method called smoothed particle hydrodynamics. This paper also includes several schemes that improve the efficiency and the numerical stability of the equations","PeriodicalId":253871,"journal":{"name":"2006 19th Brazilian Symposium on Computer Graphics and Image Processing","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129306683","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: 45
Transformation Semantics: An Efficient Approach for Collision Detection 转换语义:一种有效的碰撞检测方法
2006 19th Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2006-12-11 DOI: 10.1109/SIBGRAPI.2006.43
J. G. R. Maia, C. Vidal, J. B. C. Neto
{"title":"Transformation Semantics: An Efficient Approach for Collision Detection","authors":"J. G. R. Maia, C. Vidal, J. B. C. Neto","doi":"10.1109/SIBGRAPI.2006.43","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2006.43","url":null,"abstract":"Collision detection is an important problem in many kinds of applications. This work presents an efficient approach for exact collision detection between complex, deformable models. The approach consists of a method for fast extraction of semantics from transformation matrices which places models in a scene, together with a general strategy for fast intersection tests. Non-uniform scaling is also supported efficiently. Our experiments demonstrate that our strategies are well suitable for real-time applications","PeriodicalId":253871,"journal":{"name":"2006 19th Brazilian Symposium on Computer Graphics and Image Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130286369","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
Extracting Discriminative Information from Medical Images: A Multivariate Linear Approach 从医学图像中提取判别信息:一种多元线性方法
2006 19th Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2006-12-11 DOI: 10.1109/SIBGRAPI.2006.19
C. Thomaz, Nelson A. O. Aguiar, Sergio H. A. Oliveira, F. Duran, G. Busatto, D. Gillies, D. Rueckert
{"title":"Extracting Discriminative Information from Medical Images: A Multivariate Linear Approach","authors":"C. Thomaz, Nelson A. O. Aguiar, Sergio H. A. Oliveira, F. Duran, G. Busatto, D. Gillies, D. Rueckert","doi":"10.1109/SIBGRAPI.2006.19","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2006.19","url":null,"abstract":"Statistical discrimination methods are suitable not only for classification but also for characterization of differences between a reference group of patterns and the population under investigation. In the last years, statistical methods have been proposed to classify and analyze morphological and anatomical structures of medical images. Most of these techniques work in high-dimensional spaces of particular features such as shapes or statistical parametric maps and have overcome the difficulty of dealing with the inherent high dimensionality of medical images by analyzing segmented structures individually or performing hypothesis tests on each feature separately. In this paper, we present a general multivariate linear framework to identify and analyze the most discriminating hyper-plane separating two populations. The goal is to analyze all the intensity features simultaneously rather than segmented versions of the data separately or feature-by-feature. The conceptual and mathematical simplicity of the approach, which pivotal step is spatial normalization, involves the same operations irrespective of the complexity of the experiment or nature of the data, giving multivariate results that are easy to interpret. To demonstrate its performance we present experimental results on artificially generated data set and real medical data","PeriodicalId":253871,"journal":{"name":"2006 19th Brazilian Symposium on Computer Graphics and Image Processing","volume":"265 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133527474","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: 7
Point set compression through BSP quantization 通过BSP量化的点集压缩
2006 19th Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2006-12-11 DOI: 10.1109/SIBGRAPI.2006.36
A. Bordignon, T. Lewiner, H. Lopes, G. Tavares, Rener Castro
{"title":"Point set compression through BSP quantization","authors":"A. Bordignon, T. Lewiner, H. Lopes, G. Tavares, Rener Castro","doi":"10.1109/SIBGRAPI.2006.36","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2006.36","url":null,"abstract":"This work introduces a new compression scheme for point sets. This scheme relies on an adaptive binary space partition (BSP) which takes into account the geometric structure of the point set. This choice introduces geometrical rather than combinatorial information in the compression scheme. In order to effectively improve the final compression ratio, this partition is encoded in a progressive manner, decreasing the number of bits used for the quantisation at each subdivision. This strategy distributes the extra cost of the geometry encoding onto the maximal number of points, compressing in average 15% more than previous techniques","PeriodicalId":253871,"journal":{"name":"2006 19th Brazilian Symposium on Computer Graphics and Image Processing","volume":"844 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116424871","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
Unscented KLT: nonlinear feature and uncertainty tracking Unscented KLT:非线性特征和不确定性跟踪
2006 19th Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2006-12-11 DOI: 10.1109/SIBGRAPI.2006.46
L. Dorini, S. Goldenstein
{"title":"Unscented KLT: nonlinear feature and uncertainty tracking","authors":"L. Dorini, S. Goldenstein","doi":"10.1109/SIBGRAPI.2006.46","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2006.46","url":null,"abstract":"Accurate feature tracking is the foundation of several high level tasks, such as 3D reconstruction and motion analysis. Although there are many feature tracking algorithms, most of them do not maintain information about the error of the data being tracked. In this paper, we propose a new generic framework that uses the scaled unscented transform (SUT) to augment arbitrary feature tracking algorithms, by introducing Gaussian random variables (GRV) for the representation of features' locations uncertainties. Here, we apply the framework to the well-understood Kanade-Lucas-Tomasi (KLT) feature tracker, giving birth to what we call unscented KLT (UKLT). It tracks probabilistic confidences and better rejects errors, all on-line, and leads to more robust computer vision applications. We also validate the experiments with a bundle adjustment procedure, using real and synthetic sequences","PeriodicalId":253871,"journal":{"name":"2006 19th Brazilian Symposium on Computer Graphics and Image Processing","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122181850","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
Hand Image Segmentation in Video Sequence by GMM: a comparative analysis 基于GMM的视频序列手部图像分割的比较分析
2006 19th Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2006-12-11 DOI: 10.1109/SIBGRAPI.2006.23
H. Ribeiro, A. Gonzaga
{"title":"Hand Image Segmentation in Video Sequence by GMM: a comparative analysis","authors":"H. Ribeiro, A. Gonzaga","doi":"10.1109/SIBGRAPI.2006.23","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2006.23","url":null,"abstract":"This paper describes different approaches of realtime GMM (Gaussian mixture method) background subtraction algorithm using video sequences for hand image segmentation. In each captured image, the segmentation takes place where pixels belonging to the hands are separated from the background based on background extraction and skin-color segmentation. A time-adaptive mixture of Gaussians is used to model the distribution of each pixel color value. For an input image, every new pixel value is checked, deciding if it matches with one of the existing Gaussians based on the distance from the mean in terms of the standard deviation. The best matching distribution parameters are updated and its weight is increased. It is assumed that the values of the background pixels have low variance and large weight. These matched pixels, considered as foreground, are compared based on skin color thresholds. The hands position and other attributes are tracked by frame. That enables us to distinguish the hand movement from the background and other objects in movement, as well as to extract the information from the movement for dynamic hand gesture recognition","PeriodicalId":253871,"journal":{"name":"2006 19th Brazilian Symposium on Computer Graphics and Image Processing","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124748407","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: 55
Hardware-assisted Rendering of CSG Models CSG模型的硬件辅助渲染
2006 19th Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2006-12-11 DOI: 10.1109/SIBGRAPI.2006.24
F. Romeiro, L. Velho, L. H. Figueiredo
{"title":"Hardware-assisted Rendering of CSG Models","authors":"F. Romeiro, L. Velho, L. H. Figueiredo","doi":"10.1109/SIBGRAPI.2006.24","DOIUrl":"https://doi.org/10.1109/SIBGRAPI.2006.24","url":null,"abstract":"Current methods that interactively render reasonably complex CSG objects are image based and are severely bandwidth limited. This paper presents a new approach to ray-tracing CSG objects composed of convex primitives that combines spatial subdivision and ray-tracing methods. By performing spatial subdivision on the CSG object until locally it is simple enough to be rendered effectively and efficiently on a GPU, we are able to share the load more evenly between the CPU and the GPU and depend less on bandwidth and more on GPU instruction throughput than current methods, hence obtaining better scalability with newer hardware","PeriodicalId":253871,"journal":{"name":"2006 19th Brazilian Symposium on Computer Graphics and Image Processing","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125082765","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: 21
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