1 | // ----------------------------------------------------------------------- |
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2 | // filter.hh: Defining a filter function for wavelet reconstruction. |
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3 | // ----------------------------------------------------------------------- |
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4 | // Copyright (C) 2006, Matthew Whiting, ATNF |
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5 | // |
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6 | // This program is free software; you can redistribute it and/or modify it |
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7 | // under the terms of the GNU General Public License as published by the |
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8 | // Free Software Foundation; either version 2 of the License, or (at your |
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9 | // option) any later version. |
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10 | // |
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11 | // Duchamp is distributed in the hope that it will be useful, but WITHOUT |
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12 | // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 | // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 | // for more details. |
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15 | // |
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16 | // You should have received a copy of the GNU General Public License |
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17 | // along with Duchamp; if not, write to the Free Software Foundation, |
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18 | // Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA |
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19 | // |
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20 | // Correspondence concerning Duchamp may be directed to: |
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21 | // Internet email: Matthew.Whiting [at] atnf.csiro.au |
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22 | // Postal address: Dr. Matthew Whiting |
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23 | // Australia Telescope National Facility, CSIRO |
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24 | // PO Box 76 |
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25 | // Epping NSW 1710 |
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26 | // AUSTRALIA |
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27 | // ----------------------------------------------------------------------- |
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28 | #ifndef FILTER_H |
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29 | #define FILTER_H |
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30 | |
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31 | #include <vector> |
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32 | #include <string> |
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33 | |
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34 | namespace duchamp |
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35 | { |
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36 | |
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37 | /** |
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38 | * A class to store details of the wavelet's filter. |
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39 | * This stores all details of and functions related to the filter used to |
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40 | * generate the wavelets used in the reconstruction (and baseline |
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41 | * subtraction) functions. |
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42 | * |
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43 | * It stores the coefficients of the filter, as well as the number of scales |
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44 | * associated with it, and the sigma factors, that relate the value of the rms |
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45 | * at a given scale with the measured value. |
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46 | */ |
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47 | |
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48 | class Filter |
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49 | { |
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50 | public: |
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51 | // these are all in atrous.cc |
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52 | Filter(); ///< Constructor |
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53 | Filter(const Filter& f); |
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54 | Filter& operator=(const Filter& f); |
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55 | virtual ~Filter(); ///< Destructor |
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56 | |
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57 | /** Define the parameters for a given filter. */ |
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58 | void define(int code); |
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59 | |
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60 | /** Calculate the number of scales possible with a given filter and |
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61 | data size. */ |
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62 | int getNumScales(long length); |
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63 | |
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64 | /** Calculate the maximum number of pixels able to be analysed with |
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65 | a filter at a given scale. */ |
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66 | int getMaxSize(int scale); |
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67 | |
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68 | /** Return the width of the filter */ |
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69 | int width(){return filter1D.size();}; |
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70 | |
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71 | // these are inline functions. |
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72 | /** Return the text name of the filter */ |
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73 | std::string getName(){return name;}; |
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74 | |
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75 | /** Return the i-th value of the coefficient array. */ |
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76 | double coeff(int i){return filter1D[i];}; |
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77 | |
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78 | /** Set the i-th value of the coefficient array. */ |
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79 | void setCoeff(int i, double val){filter1D[i] = val;}; |
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80 | |
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81 | /** Return the maximum number of scales in the sigmaFactor array for |
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82 | the given dimension */ |
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83 | int maxFactor(int dim){return maxNumScales[dim-1];}; |
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84 | |
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85 | /** Set the maximum number of scales in the sigmaFactor array for |
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86 | the given dimension */ |
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87 | void setMaxFactor(int dim, int val){maxNumScales[dim-1] = val;}; |
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88 | |
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89 | /** Return the sigma scaling factor for the given dimension and |
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90 | scale of the wavelet transform. */ |
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91 | double sigmaFactor(int dim, int scale){return (*sigmaFactors[dim-1])[scale];}; |
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92 | /** Set the sigma scaling factor for the given dimension and |
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93 | scale of the wavelet transform. */ |
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94 | void setSigmaFactor(int dim, int scale, double val){(*sigmaFactors[dim])[scale] = val;}; |
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95 | |
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96 | private: |
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97 | std::string name; ///< what is the filter called? |
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98 | std::vector <double> filter1D; ///< filter coefficients. |
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99 | std::vector <int> maxNumScales; ///< max number of scales for the sigmaFactor arrays, for each dim. |
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100 | std::vector < std::vector <double>* > sigmaFactors; ///< arrays of sigmaFactors, one for each dim. |
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101 | |
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102 | // these are all in atrous.cc |
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103 | void loadSpline(); ///< set up parameters for using the |
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104 | /// B3-Spline filter. |
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105 | void loadTriangle(); ///< set up parameters for using the |
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106 | /// Triangle function. |
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107 | void loadHaar(); ///< set up parameters for using the |
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108 | /// Haar wavelet. |
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109 | |
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110 | }; |
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111 | |
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112 | } |
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113 | |
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114 | #endif |
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115 | |
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