wt04fig15.m

斯坦福大学的小波的工具箱 比matlab自带的工具箱更完善

%CAPTION
fprintf('\n');
disp('Figure 4.15')
disp('Ridges calculated from the scalogram shown in Figure 4.11.')
disp('Compare with the windowed Fourier ridges in Figure 4.12')
disp('Enlarge the window to improve the visualization of ridges.')

close all;
Name = 'Chirps';
N = 1024;
	f = MakeChirps(Name,N);
 	awt = AWT(f);
% axes handles	
	delta = 1/15;
	unit = (1-3*delta)/3;
	h3 = [1.5*delta delta 1-2.5*delta 2*unit];
	h2 = [delta 2*(unit+delta) 1-2*delta 2*unit];
	h1 = [delta 4*unit+3*delta 1-2*delta unit];
	h0 = [delta delta 1-2*delta 1-2*delta];
		sz     = size(awt);
	logawt = awt';
	linawt = log2linChap4(flipud(logawt),12);
	

figure(1);clf
	axes('position',h3);
	linridges = Ridge_AWT(flipud(linawt),3);
	sz = size(linridges);
	xtix = linspace(0,N,N);
	ytix   = linspace(450,0,sz(1));
	image(xtix,ytix,256.*linridges(1:sz(1),:));
	axis('xy')
          ylabel('Frequency')
	colormap(1-gray(256));


% Written by Maureen Clerc and Jerome Kalifa, 1997
% [e-mail], [e-mail]


    
    
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