function [af, sf] = filters1

% [h0, h1, h2] = filters1
% Symmetric Filters for the Double-Density Wavelet Transform
% Reference:
% I. W. Selesnick and A. Farras Abdelnour.
% Symmetric wavelet tight frames with two generators.
% Applied and Computational Harmonic Analalysis, 17(2), 2004.

af{1} = [
   0.00069616789827
  -0.02692519074183
  -0.04145457368920
   0.19056483888763
   0.58422553883167
   0.58422553883167
   0.19056483888763
  -0.04145457368920
  -0.02692519074183
   0.00069616789827
];

af{2} = [
  -0.00014203017443
   0.00549320005590
   0.01098019299363
  -0.13644909765612
  -0.21696226276259
   0.33707999754362
   0.33707999754362
  -0.21696226276259
  -0.13644909765612
   0.01098019299363
   0.00549320005590
  -0.00014203017443
];

af{3} = [
   0.00014203017443
  -0.00549320005590
  -0.00927404236573
   0.07046152309968
   0.13542356651691
  -0.64578354990472
   0.64578354990472
  -0.13542356651691
  -0.07046152309968
   0.00927404236573
   0.00549320005590
  -0.00014203017443
];

sf{1} = af{1}(end:-1:1);
sf{2} = af{2}(end:-1:1);
sf{3} = af{3}(end:-1:1);
