filters_sym.m

Double Density Wavelet Soft

function [af, sf] = filters_sym

% [af, sf] = filters_sym;
% Non-tight frame symmetric filters with 4 vanishing moments
% af : analysis filters
% sf : synthesis filters

af{1} = [
   0.02722186296669
   0.01121654966880
  -0.11270921793626
   0.09607810395615
   0.68529948253117
   0.68529948253117
   0.09607810395615
  -0.11270921793626
   0.01121654966880
   0.02722186296669
   ];

af{2} = [
   0.04488939651608
   0.00567077289237
  -0.28634869777356
   0.23578852836512
   0.23578852836512
  -0.28634869777356
   0.00567077289237
   0.04488939651608
   ];

af{3} = [
   0.02767057807905
   0.00715884384190
  -0.27767057807905
   0.48568231231620
  -0.27767057807905
   0.00715884384190
   0.02767057807905
   ];

sf{1} = [ 
  -0.03923740398231
  -0.07351803812277
   0.18173346513849
   0.63812875815314
   0.63812875815314
   0.18173346513849
  -0.07351803812277
  -0.03923740398231
    ];

sf{2} = [
   0.02379437723099
   0.03778447272064
  -0.07053788812010
  -0.25303694427344
   0.26199598244191
   0.26199598244191
  -0.25303694427344
  -0.07053788812010
   0.03778447272064
   0.02379437723099
   ];

sf{3} = [
   0.01102889070037
   0.01920442192095
  -0.02002440664340
  -0.26920442192095
   0.51799103188605
  -0.26920442192095
  -0.02002440664340
   0.01920442192095
   0.01102889070037
    ];