Design of two-dimensional pseudorotated digital filters satisfying prescribed specifications
Design of two-dimensional pseudorotated digital filters satisfying prescribed specifications
复制标题
满足规定规格的二维伪旋转数字滤波器的设计
DOI：
10.1109/tcs.1987.1086032
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
A. Venetsanopoulos
中科院分区：
文献类型：
--
作者：
G. Mendonça;A. Antoniou;A. Venetsanopoulos
Costa和Venetsanopoulos和Goodman提出的两种设计二维（2-D）旋转数字滤波器的方法被修改，通过一个更一般的变换进行旋转。这种修改消除了不必要的奇异性的第二类，这可能会导致一个不稳定的2-D数字滤波器时，有限精度算法用于实现。本文还介绍了满足规定规格的2-D旋转数字滤波器的设计的详细步骤。该程序可用于设计低通、高通、带通和带阻滤波器的巴特沃思、切比雪夫或椭圆型，也可用于设计波数字滤波器。可以规定的规格是最大通带涟漪、最小阻带衰减、通带和阻带边缘以及圆度。此外，可以容易地实现零相位。
Two methods for the design of two-dimensional (2-D) rotated digital filters proposed by Costa and Venetsanopoulos and Goodman are modified by performing rotation through a somewhat more general transformation. This modification eliminates nonessential singularities of the second kind, which can lead to an unstable 2-D digital filter when finiteprecision arithmetic is used for the implementation. The paper also describes detailed procedures for the design of 2-D rotated digital filters satisfying prescribed specifications. The procedures can be used for the design of low-pass, high-pass, bandpass, and bandstop filters of the Butterworth, Chebyshev, or elliptic type, and also for the design of wave digital filters. The specifications that can be prescribed are the maximum passband ripple, the minimum stopband attenuation, the passband and stopband edges, and the degree of circularity. Further, zero phase can readily be achieved.