Fourfold rotational symmetry in two-dimensional functions
作者： H. Reddy , M. Swamy , P. Rajan
DOI: 10.1109/TASSP.1982.1163913
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摘要: The presence of various types symmetry in the frequency responses a two-dimensional filter function reflects as constraints on its coefficients. In this paper, such are derived for analog and digital transfer functions so that magnitude these possess fourfold rotational symmetry. relationship between quadrantal, diagonal, octagonal symmetries is also discussed.
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