maxima.m

地震解释处理matlab工具箱

function trout=maxima(trin,mask)

% trout= maxima(trin,mask)
% 
% MAXIMA takes an input trace and a Hilbert mask (see HMASK)
% and uses spline interpolation to refine the estimates of 
% the local maxima.
%
% trin= input trace
% mask= Hilbert mask as computed by HMASK. mask is zero every
%       where except at samples corresponding to local maxima
%       of the Hilbert envelope of trin, where it takes the value
%       of 1.0
% trout= vector of spline interpolated maximum amplitudes, one for
%       each unit spike in mask
%
% by G.F. Margrave, July 1991
%
% NOTE: It is illegal for you to use this software for a purpose other
% than non-profit education or research UNLESS you are employed by a CREWES
% Project sponsor. By using this software, you are agreeing to the terms
% detailed in this software's Matlab source file.
 
% BEGIN TERMS OF USE LICENSE
%
% This SOFTWARE is maintained by the CREWES Project at the Department
% of Geology and Geophysics of the University of Calgary, Calgary,
% Alberta, Canada.  The copyright and ownership is jointly held by 
% its author (identified above) and the CREWES Project.  The CREWES 
% project may be contacted via email at:  [e-mail]
% 
% The term 'SOFTWARE' refers to the Matlab source code, translations to
% any other computer language, or object code
%
% Terms of use of this SOFTWARE
%
% 1) Use of this SOFTWARE by any for-profit commercial organization is
%    expressly forbidden unless said organization is a CREWES Project
%    Sponsor.
%
% 2) A CREWES Project sponsor may use this SOFTWARE under the terms of the 
%    CREWES Project Sponsorship agreement.
%
% 3) A student or employee of a non-profit educational institution may 
%    use this SOFTWARE subject to the following terms and conditions:
%    - this SOFTWARE is for teaching or research purposes only.
%    - this SOFTWARE may be distributed to other students or researchers 
%      provided that these license terms are included.
%    - reselling the SOFTWARE, or including it or any portion of it, in any
%      software that will be resold is expressly forbidden.
%    - transfering the SOFTWARE in any form to a commercial firm or any 
%      other for-profit organization is expressly forbidden.
%
% END TERMS OF USE LICENSE

iex=find(mask==1);
 for i=1:length(iex)
   xs=iex(i)-2:iex(i)+2;
   xi=iex(i)-2:.2:iex(i)+2;
	  ind=find(xs<=length(trin));
	  xs=xs(ind);
   ai=spline(xs,trin(xs),xi);
   trout(i)=max(ai);
 end