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This paper proposes an analytical design method for a class of 2D filters, namely elliptical-shaped zero-phase filters. These include as a particular case the circularly-symmetric filters, and also the orientation-selective filters with a narrow frequency response along a direction in the frequency plane specified by a given angle. These filters are based on zero-phase low-pass 1D prototypes. We consider...
Considerations concerning the dynamics of nonhomogeneous CNNpsilas are made and the possibility of using them for texture classifications is investigated by computer simulations.
In this paper we propose a class of 2D circularly-symmetric filter banks based on a 1D IIR Gaussian prototype. We approach two cases, namely dyadic and uniform filter banks. The Gaussian prototype is obtained using an efficient rational approximation, namely the Chebyshev-Pade approximation. Then, using a frequency transformation, the corresponding 2D filters with circular symmetry are derived. These...
Pattern formation in a new class of two-grid coupled CNN's characterized by the dependence of the array parameters on the voltage of one or several cells is investigated. The mechanism is similar to that used in harmonic oscillators to limit the oscillation amplitude. The effect of controlling each of the 6 parameters describing the linear central part of a piecewise linear CNN is analyzed and simulation...
This paper presents several results regarding the performance of feature extraction using IIR Gabor type filters banks in a texture recognition application context. These performances are studied considering different filtering schemes and filter banks parameters and compared with similar results from literature.
This paper presents several results regarding the feature extraction performances of 2D CNN Gabor type filter banks in a texture recognition application. These performances are studied for circular symmetric or separable frequency response filters with several filter neighborhood radii and parameters. The results are compared with similar approaches from literature
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