wavejs.m

老外写的小波变换的工具箱

function [xh,wcoef] = WaveJS(y,L,qmf)
% WaveJS -- James-Stein Shrinkage Applied to  Wavelet dyads
%  Usage
%    [xh,xwh] = WaveJS(y,L,qmf)
%  Inputs
%    y      array of dyadic length 2^J
%           NORMALIZED TO NOISE LEVEL 1 (See NOISENORM)
%    L      Low-Frequency cutoff for shrinkage (e.g. L=4)
%           SHOULD BE L << J
%    qmf    Quadrature Mirror Filters for Wavelet Transform
%  Outputs
%    xh   estimate, obtained by James-Stein Shrinkage
%         on Wavelet Coefficients
%    xwh  Wavelet Transform of estimate
%  See Also
%    FWT_PO, IWT_PO, JamesStein
%

	[n,J] = dyadlength(y); 

	wcoef = FWT_PO(y,L,qmf) ;

	for j=(J-1):-1:L
	   wcoef(dyad(j)) = JamesStein(wcoef(dyad(j))) ;
	end

	xh = IWT_PO(wcoef,L,qmf);
    

   

    
    
 
 
%
%  Part of Wavelab Version 850
%  Built Tue Jan  3 13:20:41 EST 2006
%  This is Copyrighted Material
%  For Copying permissions see COPYING.m
%  Comments? e-mail [e-mail]