Now showing items 1-11 of 11

  • A contour based approach for bilateral mammogram registration using discrete wavelet analysis 

    Reig Bolano, Ramon; Parisi Baradad, Vicenç; Marti Puig, Pere (2009)
    Article
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    Registration of mammograms is an essential step to increase the effectiveness of all screening programs planned to early detect breast cancer in asymptomatic women. New techniques based on data fusion of different spatial ...
  • A new otolith image contour descriptor based on partial reflection 

    Reig Bolano, Ramon; Marti Puig, Pere; Lombarte, A.; Soria Pérez, José Antonio; Parisi Baradad, Vicenç (2010-12)
    Article
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    In this paper we propose a new contour descriptor for reconstructing fish otolith contours that uses half the number of coefficients needed by the classical elliptical Fourier descriptors (EFDs) for the same accuracy. ...
  • A recursive approach to multiscalar data interpolation of sparsely sampled sea surface measurements at different spatial resolutions 

    Reig Bolano, Ramon; Garcia Ladona, E.; Parisi Baradad, Vicenç; Marti Puig, Pere (2008)
    Conference report
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    In many oceanographic studies there is a need to reconstruct a signal from a set of sparse measurements. We propose an algorithm to iteratively approximate the intermediate values between irregularly sampled data, when ...
  • Coding of biosignals using the discrete wavelet decomposition 

    Reig Bolano, Ramon; Marti Puig, Pere; Solé-Casals, Jordi; Zaiats, Vladimir; Parisi Baradad, Vicenç (Springer, 2009)
    Conference report
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    Wavelet derived codification techniques are widespread used in image codifiers. The wavelet based compression methods are adequate for representing transients. In this paper we explore the use of the discrete wavelet transform ...
  • Data compression of natural signals based on discrete wavelet transform analysis 

    Reig Bolano, Ramon; Marti Puig, Pere; Solé-Casals, Jordi; Parisi Baradad, Vicenç (2009)
    Conference report
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    In this paper we explore the use of the discrete wavelet transform analysis of an arbitrary signal in order to improve the data compression capability of data coders. Wavelet analysis is widespread used in image codifiers, ...
  • Efficient cubic spline interpolation implemented with FIR filters 

    Ferrer Arnau, Luis Jorge; Reig Bolano, Ramon; Marti Puig, Pere; Manjabacas, A.; Parisi Baradad, Vicenç (2012-06-26)
    Article
    Open Access
    Classical Cubic spline interpolation needs to solve a set of equations of high dimension. In this work we show how to compute the interpolant using a FIR digital filter, with a reduced number of operations per interpolated ...
  • Efficient representation of contours using splines implemented with FIR filters 

    Ferrer Arnau, Luis Jorge; Parisi Baradad, Vicenç; Reig Bolano, Ramon; Marti Puig, Pere; Manjabacas, A. (2011)
    Conference report
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    The interpolation of contour pixels, with splines, of an order greater than or equal to two, usually causes oscillations that do not fit the original shape. To overcome this we propose using a least squares filter before ...
  • Feature selection for analyzing and retrieving fish otoliths using elliptic Fourier descriptors of shapes 

    Reig Bolano, Ramon; Marti Puig, Pere; Gallego, Esteve; Masferrer, Gerard; Lombarte, A.; Ferrer Arnau, Luis Jorge; Parisi Baradad, Vicenç (2011)
    Conference report
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    This paper analyzes the characteristics of an experimental otolith retrieval system based on image contours described with Elliptical Fourier Descriptors (EFD). Otoliths are found in the inner ear of fish. Their shape ...
  • Otoliths identifiers using image contours EFD 

    Reig Bolano, Ramon; Marti Puig, Pere; Rodríguez González, Sara; Bajo Pérez, Javier; Parisi Baradad, Vicenç; Lombarte, A. (Springer Berlín / Heidelberg, 2010-09)
    Article
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    In this paper we analyze the characteristics of an experimental otolith identification system based on image contours described with Elliptical Fourier Descriptors (EFD). Otoliths are found in the inner ear of fishes. ...
  • Radix-R FFT and IFFT factorizations for parallel implementation 

    Marti Puig, Pere; Reig Bolano, Ramon; Parisi Baradad, Vicenç (2009)
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    Two radix-R regular interconnection pattern families of factorizations for both the FFT and the IFFT -also known as parallel or Pease factorizations- are reformulated and presented. Number R is any power of 2 and N, the ...
  • Surface parameterization for smooth 3D shapes 

    Marti Puig, Pere; Reig Bolano, Ramon; Manjabacas, A.; Ferrer Arnau, Luis Jorge; Parisi Baradad, Vicenç; Lombarte, A. (2011)
    Conference report
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    In this work we present a new method for compacting data from 3D shapes by extracting a 3D characteristic curve that we call a 3D signature. The 3D signature obtained preserves almost all the morphological shape ...