【摘要】 本文给出了一种基于巴特沃斯逼近的二维ＩＩＲ数字滤波器的设计方法，得到了由基本的全通节级联、并联实现的各种二维滤波器函数，包括，镜象对称互补滤波器、扇形滤波器和具有任意矩形通、阻带的滤波器。结果表明，这种实现结构具有通带灵敏度低、滤波器系数少的优点，并且由于巴特沃斯逼近的最大平坦性，得到的滤波器具有良好的相位特性。更多还原

【Abstract】 A Butterworth approximation based method for the design of 2-D IIR digital filters is presented,yielding the various 2-D filter functions implemented by a cascade-parallel connection of component all-pass sections.These filters include the quadrature-mirror complementary filters,2-D fan filters and those with arbitrarily rectangular pass-band and stop-band regions.It is shown that this realization structure enjoys low pass-band sensitivity and fewer filter coefficients.Furthermore,the resulting 2-D filters possess good phase reponse characteristics due to the maximal flatness of Butterworth approximation.更多还原