Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing最新文献_第2页

A new paradigm on fingerprint classification using directional image 一种基于方向图像的指纹分类新范式

Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167177

Silvia M. Farani Costa, João Marcelo V. de Oliveira, Francisco Javier Ramirez Fernandez

引用次数: 8

Compression of quincunx subbands 五阶子带的压缩

Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167163

José Alexandre Nalon, J.B.T. Yabu-uti

引用次数: 2

The color-code technique for 3D scanning 3D扫描的色码技术

Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167191

F. Franco, Antonio A. F. Oliveira

引用次数: 1

Multiscale denoising algorithm based on the a trous algorithm 基于a - trous算法的多尺度去噪算法

Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167172

R. Marques, Cassius M. Laprano, F. Medeiros

引用次数: 3

Performance evaluation of single and multiple-Gaussian models for skin color modeling 肤色建模中单高斯和多高斯模型的性能评价

Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167155

T. Caetano, S. Olabarriaga, D. Barone

{"title":"Performance evaluation of single and multiple-Gaussian models for skin color modeling","authors":"T. Caetano, S. Olabarriaga, D. Barone","doi":"10.1109/SIBGRA.2002.1167155","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167155","url":null,"abstract":"We present an experimental setup to evaluate the relative performance of single Gaussian models and Gaussian mixture models for skin color modeling. Firstly, a sample set of 1,120,000 skin pixels from a number of ethnic groups is selected and represented in the chromaticity space. Parameter estimation for both the single Gaussian and seven (with 2 to 8 Gaussian components) Gaussian mixture models is performed. For the mixture models, learning is carried out via the expectation-maximisation (EM) algorithm. In order to compare performances achieved by the 8 different models, we apply to each model a test set of 800 images - none from the training set. True skin regions, representing ground truth, are manually selected, and false positive and true positive rates are computed for each value of a specific threshold. Finally, receiver operating characteristics (ROC) curves are plotted for each model, making it possible to analyze and compare their relative performances. Results obtained show that, for medium to high true positive rates, mixture models (with 2 to 8 components) outperform the single Gaussian model. Nevertheless, for low false positive rates, all the models behave similarly.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"60 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":"131903745","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: 48

Cambio: realistic three dimensional simulation of humanoids based on computer vision and robotics Cambio:基于计算机视觉和机器人技术的逼真的人形三维模拟

Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167170

Claus C. Aranha, S. R. Carvalho, L. Gonçalves

引用次数: 1

Image moments-based structuring and tracking of objects 基于图像矩的物体结构与跟踪

Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167130

Lourena Rocha, L. Velho, P. Carvalho

引用次数: 52

Temporal segmentation of video sequences for content-based coding 基于内容编码的视频序列时间分割

Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167161

J. Camapum, Daniele Danna

引用次数: 2

Towards point-based acquisition and rendering of large real-world environments 朝着基于点的获取和渲染大型现实世界环境的方向发展

Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167124

W. Corrêa, S. Fleishman, Cláudio T. Silva

{"title":"Towards point-based acquisition and rendering of large real-world environments","authors":"W. Corrêa, S. Fleishman, Cláudio T. Silva","doi":"10.1109/SIBGRA.2002.1167124","DOIUrl":"https://doi.org/10.1109/SIBGRA.2002.1167124","url":null,"abstract":"This paper describes a pipeline for the acquisition and rendering of large real-world environments. In the acquisition phase, we use a laser rangefinder to capture the geometry of an environment, and a digital camera to capture its colors. In the rendering phase, we use a cluster of commodity PCs to render high-resolution images of the environment at interactive frame rates. In this paper, we describe in detail our scanning hardware, the tools we use to minimize the acquisition artifacts in the 3D scans, the procedure to register the scans to each other, and how to map colors from a photograph to a scan. We also present a sequential, out-of-core rendering approach that uses multiple threads to overlap rendering, visibility computation, and disk operations. Finally, we show how to use the sequential rendering approach as a building block for a parallel rendering system that uses a cluster of PCs to drive a high-resolution, multi-projector display wall. Our acquisition approach allows us to capture environments that would be extremely difficult to model by hand, and our rendering approach allows us to use inexpensive PCs, instead of high-end graphics workstations, to visualize those environments at interactive frame rates.","PeriodicalId":286814,"journal":{"name":"Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing","volume":"15 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":"114971085","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: 13

Shape evolution using restoration forces 利用恢复力的形状演变

Proceedings. XV Brazilian Symposium on Computer Graphics and Image Processing Pub Date : 2002-10-07 DOI: 10.1109/SIBGRA.2002.1167193

A. G. Bianchi, H. Hentschel, L. Costa

引用次数: 0