摘要
具有任意角度（扇形所围成的角度）和任意方向（扇形所取方向）的扇形数字滤波器在图像数据压缩和地质、地震等方面的数据处理中有着广泛的应用。目前，大多数的工作多集中于水平及垂直方向的９０°扇形数字滤波器的设计，因而有必要研究任意方向上的任意角度的扇形数字滤波器的设计方法。本文介绍利用ＭｃＣｌｅｌｌａｎ变换法设计具有垂直、水平及±４５°方向上的任意角度的扇形数字滤波器的设计方法，其中垂直和水平方向上的扇形滤波器的设计包括有近似法和优化法。由于优化法和近似法均以显式公式给出，因而，这些方法设计简单，计算量少。此外，利用该方法还可以设计任意方向上的扇形数字滤波器。
Dcsign of fan filters with arbitrary angle and orientation is very important in image compression and geophysical data processing. So far, most of the algorithms addressed to quadrant fan filter design,and these algorithms can not be used directly to design fan filters witharbitrary angle and orientation. In this paper,the approximation method to design fan filters with arbitrary angle and four orientations(0°, 90°, ± 45°) are discussed,and the optimization method to design fan filters with 0°and 90°orientation is also presented. At last,the method to construct a fan filter with arbitrary angle and orientation is introduced. Because that explicit formulae are given out, optimization process are avoid and the design of fan filters is very simple.It is shown by our experiments that our methods are very efficient to design fan filters.
出处
《通信学报》
EI
CSCD
北大核心
1994年第4期11-20,共10页
Journal on Communications
关键词
数字滤波器
滤波器
设计
Fan filter, 2-D FIR filter,Filter design
