Design of separable-denominator 2-D digital filters using the reduced-dimensional decomposition model |
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Authors: | Tian-Bo Deng Masayuki Kawamata |
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Affiliation: | (1) Department of Electronic Engineering, Faculty of Engineering, Tohoku University, Aoba, Aramaki, 980 Sendai, Japan |
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Abstract: | A separable-denominator 2-D digital filter (SD-2DDF) can be decomposed into the cascade form of a pair of 1-D digital filters (1DDFs) with different delay elements. Based on this reduced-dimensional decomposition, in this paper, we propose a new technique for designing SD-2DDFs in the spatial domain. The technique determines the coefficient matrices of 1DDFs by nonlinear optimization techniques first, and then a SD-2DDF can be easily synthesized. In addition, since the existent 1-D linear system realization techniques can be used to choose a good starting point for the optimization, extremely accurate design results can be easily achieved. |
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Keywords: | Separable-denominator 2-D digital filter (SD-2DDF) reduced-dimensional decomposition 1-D digital filter (1DDF) 1-D Lyapunov stability condition |
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