publications: - title: "THE USE OF THE MEANS LEAST MEDIAN OF SQUARES FOR ROBUST MOTION ESTIMATION OF OPTICAL FLOW" author: - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "de Assis, JT" link: "https://researchr.org/alias/de-assis%2C-jt" - name: "Stahl, NSP" link: "https://researchr.org/alias/stahl%2C-nsp" year: "2007" researchr: "https://researchr.org/publication/estrelause" cites: 0 citedby: 0 kind: "article" key: "estrelause" - title: "Error concealment by means of clustered blockwise PCA" author: - name: "Alessandra Martins Coelho" link: "http://academic.research.microsoft.com/Author/53930956/alessandra-martins-coelho" - name: "Joaquim Teixeira de Assis" link: "http://lattes.cnpq.br/7307238902576135" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Author/3361386" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Joaquim Teixeira de Assis" link: "http://academic.research.microsoft.com/Author/54447924/j-t-de-assis" - name: "Vânia Estrela" link: "http://br.linkedin.com/pub/vania-v-estrela/29/9bb/96b/" - name: "Joaquim Teixeira de Assis" link: "http://academic.research.microsoft.com/Author/54447924/j-t-de-assis" - name: "Alessandra Martins Coelho" link: "http://academic.research.microsoft.com/Author/53930956/alessandra-martins-coelho" - name: "Alessandra Martins Coelho" link: "http://academic.research.microsoft.com/Author/53930956/alessandra-martins-coelho" year: "2009" doi: "http://dx.doi.org/10.1109/PCS.2009.5167442" abstract: "This paper analyzes two variants of Principal Component Analysis (PCA) for error-concealment: blockwise PCA and clustered blockwise PCA. Realistic communication channels are not error free. Since the signals transmitted on real-world channels are highly compressed, regardless of cause, the quality of images reconstructed from any corrupted data can be very unsatisfactory. Error concealment is intended to ameliorate the impact of channel impairments by utilizing a priori information about typical images in conjunction with available picture redundancy to provide subjectively acceptable renditions of affected picture regions. Some experiments have been performed with the two proposed algorithms and they are shown." links: doi: "http://dx.doi.org/10.1109/PCS.2009.5167442" tags: - "redundancy" - "data-flow" - "data-flow analysis" researchr: "https://researchr.org/publication/coelho2009error" cites: 13 citedby: 6 pages: "1-4" booktitle: "Picture Coding Symposium, 2009. PCS 2009" organization: "IEEE" publisher: "IEEE" kind: "inproceedings" key: "coelho2009error" - title: "State-of-the Art Motion Estimation in the Context of 3D TV" author: - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Alessandra Martins Coelho" link: "http://academic.research.microsoft.com/Author/53930956/alessandra-martins-coelho" - name: "Alessandra Martins Coelho" link: "http://academic.research.microsoft.com/Author/53930956/alessandra-martins-coelho" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/57137696/the-prevalence-of-headache-among-elderly-in-a-low-income-area-of-s-o-paulo-brazil" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.jsp?id=K4793789Y3&mostrarNroCitacoesISI=true&mostrarNroCitacoesScopus=true&mostrarNroCitacoesScielo=true" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Vânia Estrela" link: "http://br.linkedin.com/pub/vania-v-estrela/29/9bb/96b/" year: "2012" doi: "10.4018/978-1-4666-2660-7.ch006" abstract: "Progress in image sensors and computation power has fueled studies to improve acquisition, processing, and analysis of 3D streams along with 3D scenes/objects reconstruction. The role of motion compensation/motion estimation (MCME) in 3D TV from end-to-end user is investigated in this chapter. Motion vectors (MVs) are closely related to the concept of disparities, and they can help improving dynamic scene acquisition, content creation, 2D to 3D conversion, compression coding, decompression/decoding, scene rendering, error concealment, virtual/augmented reality handling, intelligent content retrieval, and displaying. Although there are different 3D shape extraction methods, this chapter focuses mostly on shape-from-motion (SfM) techniques due to their relevance to 3D TV. SfM extraction can restore 3D shape information from a single camera data." links: tags: - "3D imaging" - "Inverse problems" - "motion compensation" - "image processing" - "Computer vision" - "Motion estimation" - "Error concealment" - "3D TV" - "multimedia" - "video analysis" - "stream processing" researchr: "https://researchr.org/publication/estrela2012state" cites: 109 citedby: 5 howpublished: "Paper and online" kind: "misc" key: "estrela2012state" - title: "Sub-pixel accuracy edge fitting by means of B-spline" author: - name: "Ricardo Lucas Breder Breder" link: "http://lattes.cnpq.br/3742597671704110" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Joaquim Teixeira de Assis" link: "http://lattes.cnpq.br/7307238902576135" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/57137696/the-prevalence-of-headache-among-elderly-in-a-low-income-area-of-s-o-paulo-brazil" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Joaquim Teixeira de Assis" link: "http://academic.research.microsoft.com/Author/54447924/j-t-de-assis" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Ricardo Lucas Breder" link: "http://researchr.org/alias/breder%2C-r." - name: "Vânia Vieira Estrela" link: "http://scholar.google.com/citations?hl=en&user=-ZbglqgAAAAJ&view_op=list_works&pagesize=100" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Vânia Estrela" link: "http://br.linkedin.com/pub/vania-v-estrela/29/9bb/96b/" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Joaquim T. de Assis" link: "http://researchr.org/alias/joaquim-teixeira-de-assis" - name: "V V Estrela" link: "http://researchr.org/alias/estrela%2C-vania-vieira" - name: "Joaquim T. de Assis" link: "http://researchr.org/alias/joaquim-teixeira-de-assis" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" year: "2009" abstract: "Local perturbations around contours strongly disturb the final result of computer vision tasks. It is common to introduce a priori information in the estimation process. Improvement can be achieved via a deformable model such as the snake model. In recent works, the deformable contour is modeled by means of B-spline snakes which allows local control, concise representation, and the use of fewer parameters. The estimation of the sub-pixel edges using a global B-spline model relies on the contour global determination according to a maximum likelihood framework and using the observed data likelihood. This procedure guarantees that the noisiest data will be filtered out. The data likelihood is computed as a consequence of the observation model which includes both orientation and position information. Comparative experiments of this algorithm and the classical spline interpolation have shown that the proposed algorithm outperforms the classical approach for Gaussian and Salt & Pepper noise." researchr: "https://researchr.org/publication/estrela2009sub" cites: 22 citedby: 1 pages: "1-5" booktitle: "Multimedia Signal Processing, 2009. MMSP'09. IEEE International Workshop on" organization: "IEEE" kind: "inproceedings" key: "estrela2009sub" - title: "UMA METODOLOGIA PARA APOIO A REALIZACAO DO PROCESSO DE DESCOBERTA DE CONHECIMENTO EM BASES DE DADOS" author: - name: "Alfredo Nazareno Pereira Boente" link: "http://academic.research.microsoft.com/Author/56850234/anp-boente" - name: "Ronaldo Ribeiro Goldschmidt" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?metodo=apresentar&id=K4723309Z6" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" year: "2005" abstract: "A complexidade inerente ao processo de KDD – descoberta de conhecimento em bases de dados – decorre diretamente da enorme diversidade de alternativas de ação a serem seguidas que surgem ao longo do processo. Costuma ser impossível experimentar todas as alternativas de algoritmos e parametrizações. Em geral, para que os técnicos se orientem durante o processo, é necessária a adoção de metodologias que norteiem as ações. No entanto, além de serem poucas as metodologias com esse propósito, em geral não existem mecanismos computacionais que auxiliem o processo de aplicação das metodologias. Assim sendo, o presente artigo tem como objetivo descrever a modelagem de um sistema de informação que viabilize a aplicação da metodologia para realização de KDD proposta. O sistema, já desenvolvido, vem sendo utilizado com sucesso como apoio ao processo de ensino de KDD em disciplinas oferecidas pelos autores tanto em nível de graduação quanto em nível de pós-graduação. Para modelagem foram utilizados recursos da linguagem de modelagem unificada UML. Os modelos de casos de uso e de classes do sistema foram detalhados e comentados. Conclusões e alternativas de melhorias futuras na ferramenta também foram fornecidas. " tags: - "data mining" - "C++" - "KDD" researchr: "https://researchr.org/publication/boentemetodologia" cites: 11 citedby: 0 kind: "article" key: "boentemetodologia" - title: "Data-Driven Motion Estimation with Spatial Adaptation more" author: - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Alessandra Martins Coelho" link: "http://academic.research.microsoft.com/Author/53930956/alessandra-martins-coelho" - name: "Alessandra Martins Coelho" link: "http://academic.research.microsoft.com/Author/53930956/alessandra-martins-coelho" - name: "Alessandra Martins Coelho" link: "http://academic.research.microsoft.com/Author/53930956/alessandra-martins-coelho" - name: "Alessandra Martins Coelho" link: "http://academic.research.microsoft.com/Author/53930956/alessandra-martins-coelho" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" researchr: "https://researchr.org/publication/estreladata" cites: 0 citedby: 0 journal: "International Journal of Image Processing" kind: "article" key: "estreladata" - title: "PROCESSAMENTO DE IMAGENS ESTEREOSCOPICAS PARA USO EM GEOTECNIA" author: - name: "Sandro Roberto Fernandes" link: "http://academic.research.microsoft.com/Author/53603335/sandro-r-fernandes" - name: "Ivan de Araújo Medina" link: "http://www.eng.uerj.br/prof/8" - name: "Joaquim Teixeira de Assis" link: "http://lattes.cnpq.br/7307238902576135" - name: "Marcus P. Pacheco" link: "http://academic.research.microsoft.com/Author/51419672/marcus-p-pacheco" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" year: "2006" researchr: "https://researchr.org/publication/fernandes2006processamento" cites: 0 citedby: 1 journal: "Proceedings of IX EMC" number: "http://www.emc2006.iprj.uerj.br/GEP/IX$\\backslash$\\%20EMC-2006" kind: "article" key: "fernandes2006processamento" - title: "EM-Based Mixture Models Applied to Video Event Detection" author: - name: "Alessandra Martins Coelho" link: "http://academic.research.microsoft.com/Author/53930956/alessandra-martins-coelho" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Alessandra Martins Coelho" link: "http://academic.research.microsoft.com/Author/53930956/alessandra-martins-coelho" year: "2012" abstract: "Surveillance system (SS) development requires hi-tech support to prevail over the shortcomings related to the massive quantity of visual information from SSs. Anything but reduced human monitoring became impossible by means of its physical and economic implications, and an advance towards an automated surveillance becomes the only way out. When it comes to a computer vision system, automatic video event comprehension is a challenging task due to motion clutter, event understanding under complex scenes, multi-level semantic event inference, contextualization of events and views obtained from multiple cameras, unevenness of motion scales, shape changes, occlusions and object interactions among lots of other impairments. In recent years, state-of-the-art models for video event classification and recognition include modeling events to discern context, detecting incidents with only one camera, low-level feature extraction and description, high-level semantic event classification and recognition. Even so, it is still very burdensome to recuperate or label a specific video part relying solely on its content. Principal component analysis (PCA) has been widely known and used, but when combined with other techniques such as the expectation-maximization (EM) algorithm its computation becomes more efficient. This chapter introduces advances associated to the concept of Probabilistic PCA (PPCA) analysis [Tipping et al., 1999)] by of video event understanding technologies. The PPCA model-based method results from the combination of a linear model and the EM algorithm in an iterative fashion in order to determine a principal subspace (PS). Thus, additional work may be needed to find precise principal eigenvectors of the data covariance matrix, with no rotational uncertainty. Kernel principal component analysis (KPCA) is a nonlinear PCA extension that relies on the kernel trick. It has received immense consideration for its value in nonlinear feature mining and other applications. On the other hand, the main drawback of the standard KPCA is that the huge amount of computation required, and the space needed to store the kernel matrix. KPCA can be viewed as a primal space problem with samples created via incomplete Cholesky decomposition. Therefore, all the efficient PCA algorithms can be easily adapted into KPCA. Furthermore, KPCA can be extended to a mixture of local KPCA models by applying the mixture model to probabilistic PCA in the primal space. The theoretical analysis and experiments can shed light onthe performance of the proposed methods in terms of computational efficiency and storage space, as well as recognition rate, especially when the number of data points n is large. By considering KPCA from a probabilistic point of view with the help of the EM algorithm, the computational load can be alleviated, but there still exists a rotational ambiguity with the resulting algorithm implementation. To unravel this intricacy, a constrained EM algorithm for KPCA (and PCA) was formulated founded on a coupled probability model. This brings in advantages related to many factors such as the necessary precision of extracted components, the number of the separated smaller data sets (which is usually empirically set), and the data to be processed. As a generic methodology, another thread of speeding up kernel machine learning is to seek a low-rank approximation to the kernel matrix. Since, as noted by several researchers, the spectrum of the kernel matrix tends to decay rapidly, the low-rank approximation often achieves satisfactory precision. This chapter also aims at looking closely to ways and metrics in order to evaluate these less intensive EM implementations of PCA and KPCA. " tags: - "rule-based" - "Expectation-Maximization Algorithm" - "process monitoring" - "EM Algorithm" - "data-flow analysis" researchr: "https://researchr.org/publication/coelhoestrela2012a" cites: 22 citedby: 11 howpublished: "Printed and online" kind: "misc" key: "coelhoestrela2012a" - title: "Sub-pixel accuracy edge fitting by means of B-spline" author: - name: "Ricardo Lucas Breder Breder" link: "http://lattes.cnpq.br/3742597671704110" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Joaquim Teixeira de Assis" link: "http://lattes.cnpq.br/7307238902576135" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/57137696/the-prevalence-of-headache-among-elderly-in-a-low-income-area-of-s-o-paulo-brazil" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Joaquim Teixeira de Assis" link: "http://academic.research.microsoft.com/Author/54447924/j-t-de-assis" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Ricardo Lucas Breder" link: "http://researchr.org/alias/breder%2C-r." - name: "Vânia Vieira Estrela" link: "http://scholar.google.com/citations?hl=en&user=-ZbglqgAAAAJ&view_op=list_works&pagesize=100" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Vânia Estrela" link: "http://br.linkedin.com/pub/vania-v-estrela/29/9bb/96b/" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Joaquim T. de Assis" link: "http://researchr.org/alias/joaquim-teixeira-de-assis" - name: "V V Estrela" link: "http://researchr.org/alias/estrela%2C-vania-vieira" - name: "Joaquim T. de Assis" link: "http://researchr.org/alias/joaquim-teixeira-de-assis" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" year: "2009" abstract: "Local perturbations around contours strongly disturb the final result of computer vision tasks. It is common to introduce a priori information in the estimation process. Improvement can be achieved via a deformable model such as the snake model. In recent works, the deformable contour is modeled by means of B-spline snakes which allows local control, concise representation, and the use of fewer parameters. The estimation of the sub-pixel edges using a global B-spline model relies on the contour global determination according to a maximum likelihood framework and using the observed data likelihood. This procedure guarantees that the noisiest data will be filtered out. The data likelihood is computed as a consequence of the observation model which includes both orientation and position information. Comparative experiments of this algorithm and the classical spline interpolation have shown that the proposed algorithm outperforms the classical approach for Gaussian and Salt & Pepper noise." researchr: "https://researchr.org/publication/estrela2009sub" cites: 22 citedby: 1 pages: "1-5" booktitle: "Multimedia Signal Processing, 2009. MMSP'09. IEEE International Workshop on" organization: "IEEE" kind: "inproceedings" key: "estrela2009sub" - title: "A Study on the Effect of Regularization Matrices in Motion Estimation" author: - name: "Alessandra Martins Coelho" link: "http://academic.research.microsoft.com/Author/53930956/alessandra-martins-coelho" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Author/3361386/vania-v-estrela" year: "2012" doi: "10.5120/8151-1886" abstract: "Inverse problems are very frequent in computer vision and machine learning applications. Since noteworthy hints can be obtained from motion data, it is important to seek more robust models. The advantages of using a more general regularization matrix such as ?=diag{?1,…,?K} to robustify motion estimation instead of a single parameter ? (?=?I) are investigated and formally stated in this paper, for the optical flow problem. Intuitively, this regularization scheme makes sense, but it is not common to encounter high-quality explanations from the engineering point of view. The study is further confirmed by experimental results and compared to the nonregularized Wiener filter approach. " tags: - "machine learning" - "meta-model" - "regularization" - "Inverse problems" - "data-flow" - "image processing" - "Computer vision" - "model-driven engineering" - "Motion estimation" - " principal component regression" researchr: "https://researchr.org/publication/coelho2012study" cites: 17 citedby: 5 journal: "International Journal of Computer Applications" volume: "51" number: "19" pages: "17-24" kind: "article" key: "coelho2012study" - title: "UMA METODOLOGIA PARA APOIO A REALIZACAO DO PROCESSO DE DESCOBERTA DE CONHECIMENTO EM BASES DE DADOS" author: - name: "Alfredo Nazareno Pereira Boente" link: "http://academic.research.microsoft.com/Author/56850234/anp-boente" - name: "Ronaldo Ribeiro Goldschmidt" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?metodo=apresentar&id=K4723309Z6" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" year: "2005" abstract: "A complexidade inerente ao processo de KDD – descoberta de conhecimento em bases de dados – decorre diretamente da enorme diversidade de alternativas de ação a serem seguidas que surgem ao longo do processo. Costuma ser impossível experimentar todas as alternativas de algoritmos e parametrizações. Em geral, para que os técnicos se orientem durante o processo, é necessária a adoção de metodologias que norteiem as ações. No entanto, além de serem poucas as metodologias com esse propósito, em geral não existem mecanismos computacionais que auxiliem o processo de aplicação das metodologias. Assim sendo, o presente artigo tem como objetivo descrever a modelagem de um sistema de informação que viabilize a aplicação da metodologia para realização de KDD proposta. O sistema, já desenvolvido, vem sendo utilizado com sucesso como apoio ao processo de ensino de KDD em disciplinas oferecidas pelos autores tanto em nível de graduação quanto em nível de pós-graduação. Para modelagem foram utilizados recursos da linguagem de modelagem unificada UML. Os modelos de casos de uso e de classes do sistema foram detalhados e comentados. Conclusões e alternativas de melhorias futuras na ferramenta também foram fornecidas. " tags: - "data mining" - "C++" - "KDD" researchr: "https://researchr.org/publication/boentemetodologia" cites: 11 citedby: 0 kind: "article" key: "boentemetodologia" - title: "A principal component regression strategy for estimating motion" author: - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Fernandes, SR" link: "https://researchr.org/alias/fernandes%2C-sr" - name: "Assis, JT" link: "https://researchr.org/alias/assis%2C-jt" year: "2007" researchr: "https://researchr.org/publication/estrela2007principal" cites: 0 citedby: 0 journal: "EngOpt 2008-International Conference on Engineering Optimization" kind: "article" key: "estrela2007principal" - title: "Desenvolvimento de uma Ferramenta Computacional para o Processamento de Imagens Estereosc{\\'o}picas" author: - name: "Fernandes, S.R." link: "https://researchr.org/alias/fernandes%2C-s.r." - name: "de Assis, J.T." link: "https://researchr.org/alias/de-assis%2C-j.t." - name: "Pacheco, M.P." link: "https://researchr.org/alias/pacheco%2C-m.p." - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "de Araujo Medina, I." link: "https://researchr.org/alias/de-araujo-medina%2C-i." year: "2007" researchr: "https://researchr.org/publication/fernandes2007desenvolvimento" cites: 0 citedby: 2 booktitle: "Congresso Nacional de Matem{\\'a}tica Aplicada e Computacional - CNMAC, ISSN 1984-8218" organization: "Sociedade Brasileira de Matem{\\'a}tica Aplicada e Comp" kind: "inproceedings" key: "fernandes2007desenvolvimento" - title: "Regularized PEL-Recursive Motion Estimation, Ph.D. thesis, Advisor: Nikolas Galatsanos" author: - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" year: "2002" researchr: "https://researchr.org/publication/estrela2002regularized" cites: 0 citedby: 1 school: "Illinois Institute of Technology" kind: "phdthesis" key: "estrela2002regularized" - title: "Prevalence and indirect costs of headache in a Brazilian company" author: - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/57137696/the-prevalence-of-headache-among-elderly-in-a-low-income-area-of-s-o-paulo-brazil" - name: "A. D. E. J. RODRIGUES" link: "http://www.aem-sbem.com/media/uploads/15517_ABEM_SUPL_576.pdf" - name: "G. V. D. OLIVEIRA" link: "http://www.aem-sbem.com/media/uploads/15517_ABEM_SUPL_576.pdf" - name: "K. F. D. E. SOUZA" link: "http://www.aem-sbem.com/media/uploads/15517_ABEM_SUPL_576.pdf" - name: "Leni Joaquim de Matos" link: "http://lattes.cnpq.br/5441208494229169" - name: "M. B. D. E. L. ROCHA" link: "http://www.aem-sbem.com/media/uploads/15517_ABEM_SUPL_576.pdf" - name: "Mario A. D. A. C. SAPORTA" link: "http://www.aem-sbem.com/media/uploads/15517_ABEM_SUPL_576.pdf" - name: "R. B. ORLEANS" link: "http://www.aem-sbem.com/media/uploads/15517_ABEM_SUPL_576.pdf" - name: "R. KOTECKI" link: "http://www.aem-sbem.com/media/uploads/15517_ABEM_SUPL_576.pdf" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Author/3361386" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania V Estrela" link: "http://academic.research.microsoft.com/Author/3361386" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "https://www.researchgate.net/profile/Vania_Estrela?ev=hdr_xprf&_sg=l2it7UJUf2g4wSUGGVaee_gK6wbXK75hN_Rt6P_99NMr2_HObKqAkOwo4ujJMZp7" year: "1998" doi: "10.1590/S0004-282X1998000500006" researchr: "https://researchr.org/publication/vincent1998prevalence" cites: 0 citedby: 0 journal: "Arquivos de Neuro-Psiquiatria" volume: "56" number: "4" pages: "734-743" kind: "article" key: "vincent1998prevalence" - title: "RESTAURACAO DE IMAGENS TOMOGRAFICAS CORROMPIDAS COM RUIDO POISSON: ANALISE NO DOMINIO DA FREQUENCIA ISBN 9788588769366" author: - name: "Leandro Aguiar Fernandes" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=S9175576" - name: "Suely M. M. Dias" link: "http://lattes.cnpq.br/3161384183889272" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "Leandro A. Fernandes" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=S9175576" - name: "Suely Machado Meireles Dias" link: "http://lattes.cnpq.br/3161384183889272" - name: "Suely M. M. Dias" link: "http://lattes.cnpq.br/3161384183889272" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Publication/584912/regularized-pel-recursive-motion-estimation-using-generalized-cross-validation-and-spatial" - name: "Vania Vieira Estrela" link: "http://academic.research.microsoft.com/Author/3361386/vania-v-estrela" - name: "V V Estrela" link: "https://researchr.org/alias/v-v-estrela" - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.jsp?id=K4793789Y3&mostrarNroCitacoesISI=true&mostrarNroCitacoesScopus=true&mostrarNroCitacoesScielo=true" - name: "Estrela, V V" link: "https://researchr.org/alias/estrela%2C-v-v" - name: "Vania Estrela" link: "https://researchr.org/alias/vania-estrela" - name: "Leandro Aguiar Fernandes" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=S9175576" year: "2010" abstract: " Embora a maioria das imagens medicas ainda sao produzidos nas placas atuaisde raios X, o uso da tomografia computadorizada na medicina tem evolu´ ıido significati-vamente. Os computadores s˜ ao utilizados principalmente na aquisic¸˜ ao de imagens, mas o passo atual e o futuro´ e a utilizac¸˜ ao de computac¸˜ ao gr ´ afica para auxiliar na quantizac¸˜ ao e no processamento da imagem para extrair a melhor informac¸˜ ao poss´ ıvel. A restaurac¸˜ aode uma imagem consiste na remoc¸˜ ao ou reduc¸˜ ao da degradac¸˜ ao da imagem durante sua aquisic¸˜ ao, incluindo a interfer ˆ encia introduzida pelo sistema´ otico de movimento da im-agem e do ru´ıdo eletrˆ onico e fotom´ etrico. Em um sistema linear, a degradac¸˜ ao da im- agem pode ser modelado por uma Func¸˜ ao de Espalhamento Pontual (PSF) ou de respostade impulso, na qual o ru´ıdo ´ e adicionado. Este trabalho oferece uma alternativa pararestaurac¸˜ ao de imagens, cujo ru´ ıdo´ e gerado por uma distribuic¸˜ ao de Poisson, e umadiscuss˜ ao das caracter´ısticas deste processo, no dom´ınio da freq¨ uˆ encia. " researchr: "https://researchr.org/publication/fernandes2010restauracao" cites: 7 citedby: 0 booktitle: "XIII Encontro de Modelagem Computacional" organization: "IPRJ/Universidade Federal do Rio de Janeiro - UERJ" publisher: "UERJ" kind: "inproceedings" key: "fernandes2010restauracao" - title: "Development of a computational tool for skin cancer pre-diagnosis (Desenvolvimento de ferramenta computacional para o pr{\\'e}-diagn{\\'o}stico de c{\\^a}ncer de pele), M.Sc. thesis" author: - name: "Santos, G.S." link: "https://researchr.org/alias/santos%2C-g.s." - name: "Monine, V.I." link: "https://researchr.org/alias/monine%2C-v.i." - name: "Alves Junior, N." link: "https://researchr.org/alias/alves-junior%2C-n." - name: "Vania Vieira Estrela" link: "http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793789Y3" - name: "de Assis, J.T." link: "https://researchr.org/alias/de-assis%2C-j.t." year: "2008" researchr: "https://researchr.org/publication/santos2008development" cites: 0 citedby: 0 school: "IPRJ/UERJ Universidade do Estado do Rio de Janeiro" kind: "phdthesis" key: "santos2008development"