表面测量中高斯滤波中线的有理逼近实现
许景波1,2, 袁怡宝3, 崔晓萌1,2, 郭欣1,2, 王升1,2

Rational approximation implementation approach to determine Gaussian filtering mean line in surface roughness measurement
XU Jing-bo1,2, YUAN Yi-bao3, CUI Xiao-meng1,2, GUO Xin1,2, WANG Sheng1,2
图3 零相移数字滤波器原理
Fig.3 Principle of zero phase-shift digital filter