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"Quasi-interpolation by means of filter-banks"^^ .
"We consider the problem of approximating a regular function f(t) from its samples, f(nT), taken in a uniform grid. Quasi-interpolation schemes approximate f(t) with a dilated version of a linear combination of shifted versions of a kernel ??(t), specifically fapprox T(t) = ??af[n]??(t/T - n), in a way that the polynomials of degree at most L-1 are recovered exactly. These approximation schemes give order L, i.e., the error is O(TL) where T is the sampling period. Recently, quasi-interpolation schemes using a discrete prefiltering of the samples f(nT) to obtain the coefficients af[n], have been proposed. They provide tight approximation with a low computational cost. In this work, we generalize considering rational filter banks to prefilter the samples, instead of a simple filter. This generalization provides a greater flexibility in the design of the approximation scheme. The upsampling and downsampling ratio r of the rational filter bank plays a significant role. When r = 1, the scheme has similar characteristics to those related to a simple filter. Approximation schemes corresponding to smaller ratios give less approximation quality, but, in return, they have less computational cost and involve less storage load in the system"^^ .
"2010-02" .
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"58" .
"3" .
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"IEEE"^^ .
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"IEEE Transactions on Signal Processing"^^ .
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"1053587X" .
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"Gerardo"^^ .
"Perez Villalon"^^ .
"Gerardo Perez Villalon"^^ .
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"Quasi-interpolation by means of filter-banks (PDF)"^^ .
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"INVE_MEM_2010_88030.pdf"^^ .
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"Quasi-interpolation by means of filter-banks (Other)"^^ .
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"HTML Summary of #9450 \n\nQuasi-interpolation by means of filter-banks\n\n" .
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"Matemáticas"@es .