The authors develop a fast algorithm for low- and high-pass Gaussian d
igital filters, executed while one discrete datum of a traced profile
is sampled. In this report, the 8-step, modified running-box-function
filter is presented. The transmission characteristics of this new filt
er are very close to those of the Gaussian digital filter given in ISO
468-1982. In addition, the conditions for using this filter are given
for practical use. (C) 1998 Elsevier Science Inc.