gusucode.com > DSISoft是由加拿大地质调查局发布的用于垂直地震剖面(VSP)数据处理的免费软件包 > dsisoftv3/dsisoftv3/dsisoftv3/main/medi_filt.m
function [dataout]=medi_filt(datain,window) %function [dataout]=medi_filt(datain,window) % %median filter - traces should be lined up before using %medi_filt takes the user specified number of traces (window) and sets the %middle trace points equal to the median values of the group % %datain - is in official DSI format %window - is the size of the median filter window, which must be %an odd number % %DSI customized VSP processing software %written by Kristen Beaty November, 1997 %$Id: medi_filt.m,v 3.0 2000/06/13 19:20:44 gilles Exp $ %$Log: medi_filt.m,v $ %Revision 3.0 2000/06/13 19:20:44 gilles %Release 3 % %Revision 2.0 1999/05/21 18:45:57 mah %Release 2 % %Revision 1.1 1999/01/06 19:09:05 kay %Initial revision % %Revision 1.1 1999/01/05 22:09:18 kay %Initial revision % %Copyright (C) 1998 Seismology and Electromagnetic Section/ %Continental Geosciences Division/Geological Survey of Canada % %This library is free software; you can redistribute it and/or %modify it under the terms of the GNU Library General Public %License as published by the Free Software Foundation; either %version 2 of the License, or (at your option) any later version. % %This library is distributed in the hope that it will be useful, %but WITHOUT ANY WARRANTY; without even the implied warranty of %MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU %Library General Public License for more details. % %You should have received a copy of the GNU Library General Public %License along with this library; if not, write to the %Free Software Foundation, Inc., 59 Temple Place - Suite 330, %Boston, MA 02111-1307, USA. % %DSI Consortium %Continental Geosciences Division %Geological Survey of Canada %615 Booth St. %Ottawa, Ontario %K1A 0E9 % %email: dsi@cg.nrcan.gc.ca disp('[dataout]=medi_filt(datain,window)'); window=(window-1)/2; dataout=datain; %initialize dataout nrec=datain.fh{12}; for COUNT=1:nrec %loop over records ntpr=datain.th{COUNT}(12,1); %number of traces in this record %bulk of traces for i=window+1:ntpr-window temp=datain.dat{COUNT}(:,i-window:i+window); %data within window dataout.dat{COUNT}(:,i)=median(temp,2); end %loop over bulk of traces %first traces for i=1:window %set first traces equal to filtered trace in column window+1 dataout.dat{COUNT}(:,i)=dataout.dat{COUNT}(:,window+1); end %loop over first traces %last traces for i=ntpr-window+1:ntpr %set last traces equal to filtered trace in column ntpr-window dataout.dat{COUNT}(:,i)=dataout.dat{COUNT}(:,ntpr-window); end %loop over last traces end %loop over records