no code implementations • 27 Jun 2019 • Debanshu Ratha, Eric Pottier, Avik Bhattacharya, Alejandro C. Frery
The product of the total power (Span) with these weights provides the non-negative scattering power components.
no code implementations • 23 Apr 2019 • Alejandro C. Frery, Juliana Gambini
The $\mathcal{G}^0$ distribution is widely used for monopolarized SAR image modeling because it can characterize regions with different degree of texture accurately.
no code implementations • 29 Sep 2018 • Débora Chan, Andrea Rey, Juliana Gambini, Alejandro C. Frery
It is well-known that these images are affected by speckle, and prone to contamination as double bounce and corner reflectors.
no code implementations • 1 Dec 2017 • Debanshu Ratha, Avik Bhattacharya, Alejandro C. Frery
This geodesic distance is obtained between an elementary target and the observed Kennaugh matrix, and it is further utilized to compute a similarity measure between scattering mechanisms.
no code implementations • 19 Apr 2017 • Luis Gomez, Raydonal Ospina, Alejandro C. Frery
We, then, assess the quality of a filter by the closeness of $I$ to the hypothesis that it is adherent to the statistical properties of pure speckle.
no code implementations • 1 Jan 2017 • José Naranjo-Torres, Juliana Gambini, Alejandro C. Frery
This paper presents a new proposal for feature extraction and region discrimination in SAR imagery, using the geodesic distance as a measure of dissimilarity between $\mathcal{G}_I^0$ models.
no code implementations • 26 Jan 2016 • Osvaldo A. Rosso, Raydonal Ospina, Alejandro C. Frery
We present a new approach for online handwritten signature classification and verification based on descriptors stemming from Information Theory.
no code implementations • 24 Aug 2015 • Gilberto P. Silva Junior, Alejandro C. Frery, Sandra Sandri, Humberto Bustince, Edurne Barrenechea, Cédric Marco-Detchart
We compare the modified and unmodified versions of the gravitational edge detection technique with the well-established one proposed by Canny, as well as with a recent multiscale fuzzy-based technique proposed by Lopez-Molina et Alejandro We also address the issues of aggregation of gray level images before and after edge detection and of filtering.
no code implementations • 17 Jul 2015 • Luis Gomez, Luis Alvarez, Luis Mazorra, Alejandro C. Frery
We propose a new method for PolSAR (Polarimetric Synthetic Aperture Radar) imagery classification based on stochastic distances in the space of random matrices obeying complex Wishart distributions.
no code implementations • 18 Apr 2014 • Abraão D. C. Nascimento, Alejandro C. Frery, Renato J. Cintra
This paper proposes improved methods for the maximum likelihood (ML) estimation of the equivalent number of looks $L$.
no code implementations • 9 Jan 2014 • Martín Gómez Ravetti, Laura C. Carpi, Bruna Amin Gonçalves, Alejandro C. Frery, Osvaldo A. Rosso
A recently proposed methodology called the Horizontal Visibility Graph (HVG) [Luque {\it et al.}, Phys.
no code implementations • 29 Aug 2013 • Leonardo Torres, Tamer Cavalcante, Alejandro C. Frery
The proposal is compared with the Lee's filter using a protocol based on Monte Carlo.
no code implementations • 20 Aug 2013 • Leonardo Torres, Alejandro C. Frery
The proposals are compared with the Improved Sigma filter and with anisotropic diffusion for speckled data (SRAD) using a protocol based on Monte Carlo simulation.
no code implementations • 9 Jun 2013 • Abraão D. C. Nascimento, Michelle M. Horta, Alejandro C. Frery, Renato J. Cintra
This paper discusses seven methods for edge detection in multilook PolSAR images.
no code implementations • 8 Jun 2013 • María Elena Buemi, Alejandro C. Frery, Heitor S. Ramos
We study the performance of adaptive stack filters when they are applied to speckled imagery, in particular to Synthetic Aperture Radar (SAR) images.
no code implementations • 19 Apr 2013 • Alejandro C. Frery, Abraão D. C. Nascimento, Renato J. Cintra
The scaled complex Wishart distribution is a widely used model for multilook full polarimetric SAR data whose adequacy has been attested in the literature.
no code implementations • 16 Apr 2013 • Leonardo Torres, Sidnei J. S. Sant'Anna, Corina C. Freitas, Alejandro C. Frery
The test stems from the family of (h-phi) divergences which originated in Information Theory.