Now showing items 1-20 of 26

  • A comparative study between Elliptic Fourier and B-spline descriptors for object contour representation 

    Ferrer Arnau, Luis Jorge; Parisi Baradad, Vicenç; Soria Pérez, José Antonio; Nasreddine, Kamal; Benzinou, Abdesslam (2014)
    Conference report
    Restricted access - publisher's policy
    In this work, a comparative study between Elliptic Fourier and B-spline descriptors is carried out for comparing their efficiency in characterizing the contour shape of image objects. In both cases, the goal is to obtain ...
  • A contour based approach for bilateral mammogram registration using discrete wavelet analysis 

    Reig Bolano, Ramon; Parisi Baradad, Vicenç; Marti Puig, Pere (2009)
    Article
    Restricted access - publisher's policy
    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 model-based expansion on interpolation for multiresolution sparse data 

    Reig Bolaño, Ramon; Parisi Baradad, Vicenç; García-Ladona, Emilio; Martí Puig, Pere (SARTI (Technological Development Centre of Remote Acquisition and Data processing Systems), 2008-04-08T14:18:41Z)
    Article
    Open Access
    This paper addresses the interpolation of sparse irregular data when these sparse data belong to diff erent scales. We propose an algorithm to iteratively approximate the intermediate values between irregularly sampled ...
  • 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
    Restricted access - publisher's policy
    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
    Restricted access - publisher's policy
    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 ...
  • Automated taxon identification of teleost fishes using an otolith online database-AFORO 

    Parisi Baradad, Vicenç; Manjabacas, A.; Lombarte, A.; Olivella, R.; Chic, Oscar; Piera, Jaume; Garcia Ladona, E. (2010-06)
    Article
    Restricted access - publisher's policy
    Automated Taxon Identification (ATI) systems that use a database to identify species or anatomical structures of species from different taxonomical groups have recently been developed. However, few of these works have ...
  • Best-basis development towards the automatical detection of otolith irregularities in fishes 

    Soria Pérez, José Antonio; Parisi Baradad, Vicenç (2011)
    Conference report
    Restricted access - publisher's policy
    The application of feature extraction methodologies and the detection of patterns in sagitae otoliths, which are calcified structures in the inner ear of teleostean fishes, has lead to great knowledge of marine biology ...
  • 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
    Restricted access - publisher's policy
    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 acquisition system for volcanic seismic 

    Carreras Pons, Normandino; Gomáriz Castro, Spartacus; Parisi Baradad, Vicenç; Río Fernandez, Joaquín del (Antoni Mànuel, 2012-12-01)
    Conference lecture
    Open Access
    This paper presents a design that is being created for the acquisition of volcanic seismic data. This system is composed by a microcontroller to management the peripherals, a module to acquire the information of seismic ...
  • Data acquisition system for volcanic seismic 

    Carreras Pons, Normandino; Gomáriz Castro, Spartacus; Parisi Baradad, Vicenç; Río Fernandez, Joaquín del (SARTI Technological Development Centre of Remote Acquisition and Data processing Systems, 2012)
    Article
    Open Access
    This paper presents a design that is being created for the acquisition of volcanic seismic data. This system is composed by a microcontroller to management the peripherals, a module to acquire the information of ...
  • 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
    Restricted access - publisher's policy
    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, ...
  • Decimator filter based on B-splines 

    Ferrer-Arnau, Lluís; Roset, Xavier; Parisi Baradad, Vicenç (SARTI, 2013)
    Article
    Open Access
  • Decimator filter based on B-splines 

    Ferrer Arnau, Luis Jorge; Roset Juan, Francesc Xavier; Mon González, Juan; Parisi Baradad, Vicenç (2013)
    Conference report
    Open Access
    The cascaded integrator-comb (CIC) filters are widely used as decimators in many applications, such as in delta sigma AD converters to decimate the sampled signal on its output. One problem with these filters is that by ...
  • Density Local Discriminant Bases for the analysis of otolith morphology in fish identification applications 

    Soria Pérez, José Antonio; Parisi Baradad, Vicenç; Lombarte, A. (Centre de Publicacions del Campus Nord SCCL (CPET), 2010)
    Conference report
    Open Access
  • 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 implementation with FIR filters of operators based on B-splines to represent and classify signals of one and two dimensions 

    Ferrer Arnau, Luis Jorge; Parisi Baradad, Vicenç (2012)
    Conference lecture
    Open Access
  • 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
    Restricted access - publisher's policy
    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
    Restricted access - publisher's policy
    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 ...
  • Implantació i Millora de l'European Project Semester (EPS) a l'EPSEVG 

    Segalàs Coral, Jorge; André, Michel; Arnó Macià, Elisabet; Català Mallofré, Andreu; Castell Balaguer, Joan Vicent; Domingo Gou, Marta; Guasch Murillo, Daniel; Hernández Gómez, M. Angeles; Llorens García, Ariadna; Martí Colom, Pau; Parisi Baradad, Vicenç; Río Fernandez, Joaquín del; Sánchez López, Sergio; Shariat Panahi, Shahram; Agramunt Ciurana, Víctor Manuel; Perez, Jaume; Ruiz, Xavier; Colell, Kenneth; Castelló, Sandra (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2010-02-11)
    Conference lecture / Conference report
    Open Access
    L'EPSEVG de la UPC va implantar l’European Project Semester (EPS) un programa formatiu innovador que respon a les demandes plantejades per la societat i l’Espai Europeu d’Ensenyament Superior (EEES) durant el curs ...
  • Operators to calculate the derivative of digital signals 

    Ferrer Arnau, Luis Jorge; Mon González, Juan; Parisi Baradad, Vicenç (2013)
    Conference lecture
    Open Access
    This paper presents an FIR operator with a very low computational cost for calculating the first derivative of discrete band-limited signals. The basic idea is to use cubic spline polynomials for interpolating among the ...