aifig6.m

老外写的小波变换的工具箱

% aifig6 -- Depict 2-d Average-Interpolation
%
% (Panel a) A set of 2-d block averages at a fine scale,
% (Panel b) a set of 2-d block averages two scales coarser,
% (Panel c) Refinement of the coarse-scale averages (D=2)
% (Panel c) Refinement of the coarse-scale averages (D=4)
%
% Refinement of the coarse-scale information nearly reproduces
% the original fine-scale data.
%
global Fil2 Fil4 Fil6 Fil8
global EdgeFil2 EdgeFil4 EdgeFil6 EdgeFil8
%
n = 64; lev=2;
[x,y] = ...
meshgrid((-.501+1/(2*n)):(1/n):(.501-1/(2*n)),(-.5+1/(2*n)):(1/n):(.5-1/(2*n)));
y = flipud(y);
r = sqrt(x .^2 + y .^2);
subplot(221)
sr = (sin(5 .*(r)) ./ (5 .*(r))).^2; clear r x y;
mesh(sr); title('6(a) Averages of (sin(5r)/(5r))^2,  Fine scale, j=6')
csr = HCoarsen2d(sr,lev);
clear sr;
Hsr = HRefine2d(csr,lev);
subplot(222);
mesh(Hsr); title('6(b) Averages at Coarse scale, j=4')
clear Hsr; 
Rsr2 = AIRefine2d(csr,lev,2,Fil2,EdgeFil2);
subplot(223);
mesh(Rsr2); title('6(c) D=2 Interpolation from Coarse to Fine') 
clear Rsr2;
Rsr4 = AIRefine2d(csr,lev,4,Fil4,EdgeFil4);
subplot(224);
mesh(Rsr4); title('6(d) D=4 Interpolation from Coarse to Fine');

%	Revision History
%		09/29/99	MRD	meshdom replaced by meshgrid/flipud
    
    
 
 
%
%  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]