publications:
- 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"
  kind: "inproceedings"
  key: "coelho2009error"
- 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"
  kind: "inproceedings"
  key: "estrela2009sub"
- 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"