Undefined function or variable 'FSfarras'

i am using 2d dual tree discrete wavelet transform .it says error while compiling as [Faf, Fsf] = FSfarras; ??? Undefined function or variable 'FSfarras'.please help us

Answer 1

[Youssef Khmou]

add the function FSfarras in your MATLAB directory and try again :

 function [af, sf] = FSfarras

 % Farras filters organized for the dual-tree
% complex DWT.
%
% USAGE:
%    [af, sf] = FSfarras
% OUTPUT:
%    af{i}, i = 1,2 - analysis filters for tree i
%    sf{i}, i = 1,2 - synthesis filters for tree i
% See farras, dualtree, dualfilt1.
%
% WAVELET SOFTWARE AT POLYTECHNIC UNIVERSITY, BROOKLYN, NY
% http://taco.poly.edu/WaveletSoftware/

 af{1} = [
                  0                  0
  -0.08838834764832  -0.01122679215254
   0.08838834764832   0.01122679215254
   0.69587998903400   0.08838834764832
   0.69587998903400   0.08838834764832
   0.08838834764832  -0.69587998903400
  -0.08838834764832   0.69587998903400
   0.01122679215254  -0.08838834764832
   0.01122679215254  -0.08838834764832
                  0                  0
 ];

 sf{1} = af{1}(end:-1:1, :);

 af{2} = [
   0.01122679215254                  0
   0.01122679215254                  0
  -0.08838834764832  -0.08838834764832
   0.08838834764832  -0.08838834764832
   0.69587998903400   0.69587998903400
   0.69587998903400  -0.69587998903400
   0.08838834764832   0.08838834764832
  -0.08838834764832   0.08838834764832
                  0   0.01122679215254
                  0  -0.01122679215254
 ];

 sf{2} = af{2}(end:-1:1, :);

[Youssef Khmou]

if you use it in your project,please add the following link in the reference:

WAVELET SOFTWARE AT POLYTECHNIC UNIVERSITY, BROOKLYN, NY http://taco.poly.edu/WaveletSoftware/

[maha lakshmi]

your answer is helpful but on execution we got an error please help us w = dualtree2D(x, J, Faf, af); ??? Undefined function or method 'afb2D_A' for input arguments of type 'uint8'. y = idualtree2D(w, J, Fsf, sf); ??? Undefined function or method 'idualtree2D' for input arguments of type 'cell'.

[Youssef Khmou]

 function w = dualtree2D(x, J, Faf, af)

 % 2D Dual-Tree Discrete Wavelet Transform
%
% w = dualtree2D(x, J, Faf, af)
% INPUT:
%    x   - 2-D signal
%    J   - number of stages
%    Faf - first stage filters
%    af  - filters for remaining stages
% OUPUT:
%    w{i}{1:J+1}: tree i wavelet coeffs (i = 1,2)

 [x1 w{1}{1}] = afb2D(x, Faf{1});
for k = 2:J
    [x1 w{k}{1}] = afb2D(x1, af{1});
end
 w{J+1}{1} = x1;

 [x2 w{1}{2}] = afb2D(x, Faf{2});
for k = 2:J
    [x2 w{k}{2}] = afb2D(x2, af{2});
end
w{J+1}{2} = x2;

 for k = 1:J
    for m = 1:3
        [w{k}{1}{m} w{k}{2}{m}] = pm(w{k}{1}{m},w{k}{2}{m});
    end
end