[586fe9]: wavelets / wfilt_symds.m Maximize Restore History

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wfilt_symds.m    205 lines (191 with data), 8.3 kB

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function [h,g,a,info] = wfilt_symds(N)
%WFILT_SYMDS Symmetric wavelets dyadic sibling
% Usage: [h,g,a] = wfilt_symds(N);
%
% `[h,g,a]=wfilt_symds(N)` Returns symmetric dyadic sibling wavelet filters.
% The redundancy is equal to 2.
%
% Examples:
% ---------
% :::
% figure(1);
% wfiltinfo('ana:symds3');
% figure(2);
% wfiltinfo('syn:symds3');
%
% References: abdelnour2012sib
%
info.istight = 0;
a = [2;2;2;2];
switch(N)
case 1
% Example 1. Not a tight frame!
harr = [
-5 3 -1 0
-7 17 -2 -1
35 11 -3 -2
105 -31 12 -3
105 -31 -3 12
35 11 -2 -3
-7 17 -1 -2
-5 3 0 -1
];
harr(:,1)=harr(:,1)*sqrt(2)/2^8;
harr(:,2)=harr(:,2)/2^7;
harr(:,3:4)=harr(:,3:4)/2^4;
if(nargout>1)
garr = [
0 0 0 0
-3 -5 0 -1
5 -13 -1 -2
30 18 -2 6
30 18 6 -2
5 -13 -2 -1
-3 -5 -1 0
0 0 0 0
];
garr(:,1)=garr(:,1)*sqrt(2)/2^6;
garr(:,2)=garr(:,2)/2^6;
garr(:,3:4)=garr(:,3:4)/2^3;
end;
case 2
% Example 2. Not a tight frame!
harr = [
0 0 0 0
0 0 0 0
0 -sqrt(2)/2^5 -1/2^3 0
-sqrt(2)/2^5 -4*sqrt(2)/2^5 -2/2^3 -1/2^3
0 sqrt(2)/2^5 6/2^3 -2/2^3
9*sqrt(2)/2^5 8*sqrt(2)/2^5 -2/2^3 6/2^3
16*sqrt(2)/2^5 sqrt(2)/2^5 -1/2^3 -2/2^3
9*sqrt(2)/2^5 -4*sqrt(2)/2^5 0 -1/2^3
0 -sqrt(2)/2^5 0 0
-sqrt(2)/2^5 0 0 0
];
if(nargout>1)
garr = [
-sqrt(2)/2^5 0 0 1/2^6
0 -sqrt(2)/2^5 1/2^6 2/2^6
9*sqrt(2)/2^5 -4*sqrt(2)/2^5 2/2^6 0
16*sqrt(2)/2^5 sqrt(2)/2^5 0 -18/2^6
9*sqrt(2)/2^5 8*sqrt(2)/2^5 -18/2^6 30/2^6
0 sqrt(2)/2^5 30/2^6 -18/2^6
-sqrt(2)/2^5 -4*sqrt(2)/2^5 -18/2^6 0
0 -sqrt(2)/2^5 0 2/2^6
0 0 2/2^6 1/2^6
0 0 1/2^6 0
];
end;
case 3
% Example 3. Not a tight frame!
harr = [
0 35*sqrt(2)/2^12 0.003385355341795 0
35*sqrt(2)/2^12 185*sqrt(2)/2^12 0.011757930078244 0.003385355341795
-45*sqrt(2)/2^12 208*sqrt(2)/2^12 0.038383315957975 0.011757930078244
-252*sqrt(2)/2^12 -648*sqrt(2)/2^12 0.127426546608992 0.038383315957975
420*sqrt(2)/2^12 -706*sqrt(2)/2^12 -0.112865104706813 0.127426546608992
1890*sqrt(2)/2^12 706*sqrt(2)/2^12 -0.710280910094278 -0.112865104706813
1890*sqrt(2)/2^12 648*sqrt(2)/2^12 0.710280910094278 -0.710280910094278
420*sqrt(2)/2^12 -208*sqrt(2)/2^12 0.112865104706813 0.710280910094278
-252*sqrt(2)/2^12 -185*sqrt(2)/2^12 -0.127426546608992 0.112865104706813
-45*sqrt(2)/2^12 -35*sqrt(2)/2^12 -0.038383315957975 -0.127426546608992
35*sqrt(2)/2^12 0 -0.011757930078244 -0.038383315957975
0 0 -0.003385355341795 -0.011757930078244
0 0 0 -0.003385355341795
];
if(nargout>1)
garr = [
% 0 0 0 0
0 0 0 0
35*sqrt(2)/2^12 0 0 -0.043136204314165
-45*sqrt(2)/2^12 35*sqrt(2)/2^12 -0.043136204314165 -0.022725249453801
-252*sqrt(2)/2^12 185*sqrt(2)/2^12 -0.022725249453801 -0.016002341917868
420*sqrt(2)/2^12 208*sqrt(2)/2^12 -0.016002341917868 0.463586703221768
1890*sqrt(2)/2^12 -648*sqrt(2)/2^12 0.463586703221768 -0.463586703221768
1890*sqrt(2)/2^12 -706*sqrt(2)/2^12 -0.463586703221768 0.016002341917868
420*sqrt(2)/2^12 706*sqrt(2)/2^12 0.016002341917868 0.022725249453801
-252*sqrt(2)/2^12 648*sqrt(2)/2^12 0.022725249453801 0.043136204314165
-45*sqrt(2)/2^12 -208*sqrt(2)/2^12 0.043136204314165 0
35*sqrt(2)/2^12 -185*sqrt(2)/2^12 0 0
0 -35*sqrt(2)/2^12 0 0
];
end;
case 4
% Example 4. Not a tight frame!
harr = [
0 99 0.0008317898274 0
99 837 0.00527762349601 0.0008317898274
351 2630 0.01705880266437 0.00527762349601
-286 2778 0.02633268946272 0.01705880266437
-2574 -3195 0.03753999326488 0.02633268946272
-1287 -10429 -0.00195902477575 0.03753999326488
10725 -6348 -0.0711227784702 -0.00195902477575
25740 6348 -0.54534348089652 -0.0711227784702
25740 10429 0.54534348089652 -0.54534348089652
10725 3195 0.0711227784702 0.54534348089652
-1287 -2778 0.00195902477575 0.0711227784702
-2574 -2630 -0.03753999326488 0.00195902477575
-286 -837 -0.02633268946272 -0.03753999326488
351 -99 -0.01705880266437 -0.02633268946272
99 0 -0.00527762349601 -0.01705880266437
0 0 -0.0008317898274 -0.00527762349601
0 0 0 -0.0008317898274
];
harr(:,1:2)=harr(:,1:2)*sqrt(2)/2^16;
if(nargout>1)
garr = [
% 0 0 0 0
0 0 0 0
99 0 0 -0.0054868984046
351 99 -0.0054868984046 -0.03102895771555
-286 837 -0.03102895771555 -0.05109382225012
-2574 2630 -0.05109382225012 -0.05321999995116
-1287 2778 -0.05321999995116 0.1089262550963
10725 -3195 0.1089262550963 0.6365944921083
25740 -10429 0.6365944921083 -0.6365944921083
25740 -6348 -0.6365944921083 -0.1089262550963
10725 6348 -0.1089262550963 0.05321999995116
-1287 10429 0.05321999995116 0.05109382225012
-2574 3195 0.05109382225012 0.03102895771555
-286 -2778 0.03102895771555 0.0054868984046
351 -2630 0.0054868984046 0
99 -837 0 0
0 -99 0 0
];
garr(:,1:2)=garr(:,1:2)*sqrt(2)/2^16;
end;
case 5
% Example 5. Not a tight frame!
harr = [
-5 35 0 5
-7 -35 35 -7
35 -665 -35 -35
105 665 -665 105
105 665 665 -105
35 -665 665 35
-7 -35 -665 7
-5 35 -35 -5
0 0 35 0
];
harr(:,[1 4])=harr(:,[1 4])*sqrt(2)/2^8;
harr(:,2:3)=harr(:,2:3)*sqrt(2)/2^12;
if(nargout>1)
garr = [
% 0 0 0 0
-5 0 -1 -5
-7 -1 -1 7
35 -1 2 35
105 2 2 -105
105 2 -1 105
35 -1 -1 -35
-7 -1 0 -7
-5 0 0 5
];
garr(:,[1 4])=garr(:,[1 4])*sqrt(2)/2^8;
garr(:,2:3)=garr(:,2:3)*sqrt(2)/2^3;
end;
otherwise
error('%s: No such filters.',upper(mfilename));
end
g=mat2cell(garr,size(garr,1),ones(1,size(garr,2)));
h=mat2cell(flipud(harr),size(harr,1),ones(1,size(harr,2)));