1 | // ----------------------------------------------------------------------- |
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2 | // GaussSmooth.cc: Member functions for the GaussSmooth class. |
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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 | #include <iostream> |
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29 | #include <math.h> |
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30 | #ifdef HAVE_VALUES_H |
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31 | #include <values.h> |
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32 | #endif |
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33 | #include <duchamp/Utils/GaussSmooth.hh> |
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34 | |
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35 | template <class Type> |
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36 | GaussSmooth<Type>::GaussSmooth() |
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37 | { |
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38 | allocated=false; |
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39 | } |
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40 | template GaussSmooth<float>::GaussSmooth(); |
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41 | template GaussSmooth<double>::GaussSmooth(); |
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42 | |
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43 | template <class Type> |
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44 | GaussSmooth<Type>::~GaussSmooth() |
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45 | { |
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46 | if(allocated) delete [] kernel; |
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47 | } |
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48 | template GaussSmooth<float>::~GaussSmooth(); |
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49 | template GaussSmooth<double>::~GaussSmooth(); |
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50 | |
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51 | template <class Type> |
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52 | GaussSmooth<Type>::GaussSmooth(const GaussSmooth& g) |
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53 | { |
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54 | operator=(g); |
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55 | } |
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56 | template GaussSmooth<float>::GaussSmooth(const GaussSmooth& g); |
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57 | template GaussSmooth<double>::GaussSmooth(const GaussSmooth& g); |
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58 | |
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59 | template <class Type> |
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60 | GaussSmooth<Type>& GaussSmooth<Type>::operator=(const GaussSmooth& g) |
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61 | { |
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62 | if(this==&g) return *this; |
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63 | this->kernMaj = g.kernMaj; |
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64 | this->kernMin = g.kernMin; |
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65 | this->kernPA = g.kernPA; |
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66 | this->kernWidth = g.kernWidth; |
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67 | this->stddevScale = g.stddevScale; |
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68 | if(this->allocated) delete [] this->kernel; |
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69 | this->allocated = g.allocated; |
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70 | if(this->allocated){ |
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71 | this->kernel = new Type[this->kernWidth*this->kernWidth]; |
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72 | for(int i=0;i<this->kernWidth*this->kernWidth;i++) |
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73 | this->kernel[i] = g.kernel[i]; |
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74 | } |
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75 | return *this; |
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76 | } |
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77 | template GaussSmooth<float>& GaussSmooth<float>::operator=(const GaussSmooth& g); |
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78 | template GaussSmooth<double>& GaussSmooth<double>::operator=(const GaussSmooth& g); |
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79 | |
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80 | template <class Type> |
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81 | GaussSmooth<Type>::GaussSmooth(float maj, float min, float pa) |
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82 | { |
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83 | this->allocated=false; |
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84 | this->define(maj, min, pa); |
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85 | } |
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86 | template GaussSmooth<float>::GaussSmooth(float maj, float min, float pa); |
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87 | template GaussSmooth<double>::GaussSmooth(float maj, float min, float pa); |
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88 | |
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89 | template <class Type> |
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90 | GaussSmooth<Type>::GaussSmooth(float maj) |
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91 | { |
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92 | this->allocated=false; |
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93 | this->define(maj, maj, 0); |
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94 | } |
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95 | template GaussSmooth<float>::GaussSmooth(float maj); |
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96 | template GaussSmooth<double>::GaussSmooth(float maj); |
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97 | |
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98 | template <class Type> |
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99 | void GaussSmooth<Type>::define(float maj, float min, float pa) |
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100 | { |
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101 | |
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102 | this->kernMaj = maj; |
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103 | this->kernMin = min; |
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104 | this->kernPA = pa; |
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105 | |
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106 | // The parameters kernMaj & kernMin are the FWHM in the major and |
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107 | // minor axis directions. We correct these to the sigma_x and |
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108 | // sigma_y parameters for the 2D gaussian by halving and dividing by |
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109 | // sqrt(2 ln(2)). Actually work with sigma_x^2 to make things |
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110 | // easier. |
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111 | float sigmaX2 = (this->kernMaj*this->kernMaj/4.) / (2.*M_LN2); |
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112 | float sigmaY2 = (this->kernMin*this->kernMin/4.) / (2.*M_LN2); |
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113 | |
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114 | // First determine the size of the kernel. Calculate the size based |
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115 | // on the number of pixels needed to make the exponential drop to |
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116 | // less than the minimum floating-point value. Use the major axis to |
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117 | // get the largest square that includes the ellipse. |
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118 | float majorSigma = this->kernMaj / (4.*M_LN2); |
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119 | int kernelHW = int(ceil(majorSigma * sqrt(-2.*log(1. / MAXFLOAT)))); |
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120 | this->kernWidth = 2*kernelHW + 1; |
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121 | // std::cerr << "Making a kernel of width " << this->kernWidth << "\n"; |
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122 | |
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123 | if(this->allocated) delete [] this->kernel; |
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124 | this->kernel = new Type[this->kernWidth*this->kernWidth]; |
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125 | this->allocated = true; |
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126 | this->stddevScale=0.; |
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127 | float posang = this->kernPA * M_PI/180.; |
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128 | |
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129 | |
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130 | for(int i=0;i<this->kernWidth;i++){ |
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131 | for(int j=0;j<this->kernWidth;j++){ |
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132 | float xpt = (i-kernelHW)*sin(posang) - (j-kernelHW)*cos(posang); |
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133 | |
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134 | float ypt = (i-kernelHW)*cos(posang) + (j-kernelHW)*sin(posang); |
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135 | float rsq = (xpt*xpt/sigmaX2) + (ypt*ypt/sigmaY2); |
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136 | kernel[i*this->kernWidth+j] = exp( -0.5 * rsq); |
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137 | this->stddevScale += |
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138 | kernel[i*this->kernWidth+j]*kernel[i*this->kernWidth+j]; |
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139 | } |
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140 | } |
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141 | this->stddevScale = sqrt(this->stddevScale); |
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142 | // std::cerr << "Stddev scaling factor = " << this->stddevScale << "\n"; |
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143 | } |
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144 | template void GaussSmooth<float>::define(float maj, float min, float pa); |
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145 | template void GaussSmooth<double>::define(float maj, float min, float pa); |
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146 | |
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147 | template <class Type> |
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148 | Type *GaussSmooth<Type>::smooth(Type *input, int xdim, int ydim, bool scaleByCoverage) |
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149 | { |
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150 | /// @details |
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151 | /// Smooth a given two-dimensional array, of dimensions xdim |
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152 | /// \f$\times\f$ ydim, with an elliptical gaussian. Simply runs as a |
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153 | /// front end to GaussSmooth::smooth(float *, int, int, bool *) by |
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154 | /// defining a mask that allows all pixels in the input array. |
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155 | /// |
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156 | /// \param input The 2D array to be smoothed. |
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157 | /// \param xdim The size of the x-dimension of the array. |
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158 | /// \param ydim The size of the y-dimension of the array. |
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159 | /// \return The smoothed array. |
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160 | |
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161 | Type *smoothed; |
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162 | bool *mask = new bool[xdim*ydim]; |
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163 | for(int i=0;i<xdim*ydim;i++) mask[i]=true; |
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164 | smoothed = this->smooth(input,xdim,ydim,mask,scaleByCoverage); |
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165 | delete [] mask; |
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166 | return smoothed; |
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167 | } |
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168 | template float *GaussSmooth<float>::smooth(float *input, int xdim, int ydim, bool scaleByCoverage); |
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169 | template double *GaussSmooth<double>::smooth(double *input, int xdim, int ydim, bool scaleByCoverage); |
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170 | |
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171 | template <class Type> |
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172 | Type *GaussSmooth<Type>::smooth(Type *input, int xdim, int ydim, bool *mask, bool scaleByCoverage) |
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173 | { |
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174 | /// @details |
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175 | /// Smooth a given two-dimensional array, of dimensions xdim |
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176 | /// \f$\times\f$ ydim, with an elliptical gaussian, where the |
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177 | /// boolean array mask defines which values of the array are valid. |
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178 | /// |
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179 | /// This function convolves the input array with the kernel that |
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180 | /// needs to have been defined. If it has not, the input array is |
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181 | /// returned unchanged. |
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182 | /// |
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183 | /// The mask should be the same size as the input array, and have |
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184 | /// values of true for entries that are considered valid, and false |
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185 | /// for entries that are not. For instance, arrays from FITS files |
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186 | /// should have the mask entries corresponding to BLANK pixels set |
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187 | /// to false. |
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188 | /// |
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189 | /// \param input The 2D array to be smoothed. |
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190 | /// \param xdim The size of the x-dimension of the array. |
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191 | /// \param ydim The size of the y-dimension of the array. |
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192 | /// \param mask The array showing which pixels in the input array |
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193 | /// are valid. |
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194 | /// \return The smoothed array. |
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195 | |
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196 | if(!this->allocated) return input; |
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197 | else{ |
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198 | |
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199 | Type *output = new Type[xdim*ydim]; |
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200 | |
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201 | int pos,comp,xcomp,ycomp,fpos,ct; |
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202 | float fsum,kernsum=0; |
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203 | int kernelHW = this->kernWidth/2; |
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204 | |
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205 | for(int i=0;i<this->kernWidth;i++) |
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206 | for(int j=0;j<this->kernWidth;j++) |
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207 | kernsum += this->kernel[i*this->kernWidth+j]; |
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208 | |
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209 | for(int ypos = 0; ypos<ydim; ypos++){ |
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210 | for(int xpos = 0; xpos<xdim; xpos++){ |
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211 | pos = ypos*xdim + xpos; |
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212 | |
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213 | if(!mask[pos]) output[pos] = input[pos]; |
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214 | else{ |
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215 | |
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216 | ct=0; |
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217 | fsum=0.; |
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218 | output[pos] = 0.; |
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219 | |
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220 | for(int yoff = -kernelHW; yoff<=kernelHW; yoff++){ |
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221 | ycomp = ypos + yoff; |
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222 | if((ycomp>=0)&&(ycomp<ydim)){ |
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223 | |
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224 | for(int xoff = -kernelHW; xoff<=kernelHW; xoff++){ |
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225 | xcomp = xpos + xoff; |
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226 | if((xcomp>=0)&&(xcomp<xdim)){ |
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227 | |
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228 | fpos = (xoff+kernelHW) + (yoff+kernelHW)*this->kernWidth; |
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229 | comp = ycomp*xdim + xcomp; |
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230 | if(mask[comp]){ |
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231 | ct++; |
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232 | fsum += this->kernel[fpos]; |
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233 | output[pos] += input[comp]*this->kernel[fpos]; |
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234 | } |
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235 | |
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236 | } |
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237 | } // xoff loop |
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238 | |
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239 | } |
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240 | }// yoff loop |
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241 | // if(ct>0 && scaleByCoverage) output[pos] /= fsum; |
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242 | if(ct>0 && scaleByCoverage) output[pos] *= kernsum/fsum; |
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243 | |
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244 | } // else{ |
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245 | |
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246 | } //xpos loop |
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247 | } //ypos loop |
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248 | |
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249 | return output; |
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250 | } |
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251 | |
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252 | } |
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253 | template float *GaussSmooth<float>::smooth(float *input, int xdim, int ydim, bool *mask, bool scaleByCoverage); |
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254 | template double *GaussSmooth<double>::smooth(double *input, int xdim, int ydim, bool *mask, bool scaleByCoverage); |
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