diff examples/AudioInpainting/Audio_Declipping_Example.m @ 136:1334d2302dd9 ivand_dev

Added Audio declipping problem (problem, reconstruct and example function)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/AudioInpainting/Audio_Declipping_Example.m	Thu Jul 14 16:26:07 2011 +0100
@@ -0,0 +1,79 @@
+%%  Audio Declipping Example
+%   
+%   CHANGE!!! This example is based on the experiment suggested by Professor Pierre
+%   Vandergheynst on the SMALL meeting in Villars.
+%   The idea behind is to use patches from source image as a dictionary in
+%   which we represent target image using matching pursuit algorithm.
+%   Calling Pierre_Problem function to get src image to be used as dictionary
+%   and target image to be represented using MP with 3 patches from source image
+
+%
+%   Centre for Digital Music, Queen Mary, University of London.
+%   This file copyright 2011 Ivan Damnjanovic.
+%
+%   This program is free software; you can redistribute it and/or
+%   modify it under the terms of the GNU General Public License as
+%   published by the Free Software Foundation; either version 2 of the
+%   License, or (at your option) any later version.  See the file
+%   COPYING included with this distribution for more information.
+%
+%%
+
+clear all;
+
+%   Defining the Problem structure
+
+SMALL.Problem = generateAudioDeclippingProblem('male01_8kHz.wav', 0.6, 256, 0.5, @wRect, @wSine, @wRect, @Gabor_Dictionary, 2);
+
+% %   Show original image and image that is used as a dictionary
+% figure('Name', 'Original and Dictionary Image');
+% 
+% subplot(1,2,1); imagesc(SMALL.Problem.imageTrg/SMALL.Problem.maxval);
+% title('Original Image');colormap(gray);axis off; axis image;
+% subplot(1,2,2); imagesc(SMALL.Problem.imageSrc/SMALL.Problem.maxval);
+% title('Dictionary image:');colormap(gray);axis off; axis image;
+time=0;
+coeffFrames = zeros(SMALL.Problem.p, SMALL.Problem.n);
+
+for i=1:SMALL.Problem.n
+    
+    idx = find(SMALL.Problem.M(:,i));
+    SMALL.Problem.A  = SMALL.Problem.B(idx,:);
+    
+    SMALL.Problem.b1 = SMALL.Problem.b(idx,i);
+    
+   
+    
+    %   Defining the parameters sparse representation
+    SMALL.solver=SMALL_init_solver;
+    SMALL.solver.toolbox='ompbox';
+    SMALL.solver.name='omp2';
+    
+    SMALL.solver.param=struct(...
+        'epsilon', 0.001,...
+        'maxatoms', 64); 
+    
+    % Find solution
+    
+    SMALL.solver=SMALL_solve(SMALL.Problem, SMALL.solver);
+    
+    
+    coeffFrames(:,i) = SMALL.solver.solution;
+    time = time + SMALL.solver.time;
+    
+    
+      
+end
+
+%%   Set reconstruction function
+
+SMALL.Problem.reconstruct=@(x) AudioDeclipping_reconstruct(x, SMALL.Problem);
+reconstructed=SMALL.Problem.reconstruct(coeffFrames);
+
+%%  plot time and psnr given dictionary size %%
+figure('Name', 'time and psnr');
+
+subplot(1,2,1); plot(dictsize(1,:), time(1,:), 'ro-');
+title('Time vs number of source image patches used');
+subplot(1,2,2); plot(dictsize(1,:), psnr(1,:), 'b*-');
+title('PSNR vs number of source image patches used');
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