1 | // |
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2 | // C++ Implimentation: GenericEdgeDetector |
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3 | // |
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4 | // Description: |
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5 | // |
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6 | // |
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7 | // Author: Takeshi Nakazato <takeshi.nakazato@nao.ac.jp>, (C) 2012 |
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8 | // |
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9 | // Copyright: See COPYING file that comes with this distribution |
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10 | // |
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11 | // |
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12 | #include <math.h> |
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13 | #include <limits.h> |
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14 | #include <stdint.h> |
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15 | |
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16 | #include <casa/Arrays/Vector.h> |
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17 | #include <casa/Arrays/Matrix.h> |
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18 | #include <casa/Arrays/ArrayMath.h> |
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19 | #include <casa/Arrays/ArrayIO.h> |
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20 | #include <casa/Utilities/GenSort.h> |
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21 | |
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22 | #include <coordinates/Coordinates/DirectionCoordinate.h> |
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23 | |
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24 | #include "GenericEdgeDetector.h" |
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25 | |
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26 | using namespace std ; |
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27 | using namespace casa ; |
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28 | |
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29 | namespace asap { |
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30 | |
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31 | GenericEdgeDetector::GenericEdgeDetector() |
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32 | : EdgeDetector() |
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33 | {} |
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34 | |
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35 | GenericEdgeDetector::~GenericEdgeDetector() |
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36 | {} |
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37 | |
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38 | Vector<uInt> GenericEdgeDetector::detect() |
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39 | { |
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40 | os_.origin(LogOrigin( "GenericEdgeDetector", "detect", WHERE )) ; |
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41 | |
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42 | initDetect() ; |
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43 | |
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44 | topixel() ; |
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45 | countup() ; |
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46 | thresholding() ; |
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47 | labeling() ; |
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48 | trimming() ; |
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49 | selection() ; |
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50 | tuning() ; |
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51 | |
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52 | os_ << LogIO::DEBUGGING |
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53 | << "Detected " << off_.nelements() << " integrations as OFF" << LogIO::POST ; |
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54 | |
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55 | return off_ ; |
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56 | } |
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57 | |
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58 | void GenericEdgeDetector::parseOption( const Record &option ) |
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59 | { |
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60 | os_.origin(LogOrigin( "GenericEdgeDetector", "parseOption", WHERE )) ; |
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61 | |
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62 | String name = "fraction" ; |
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63 | if ( option.isDefined( name ) ) { |
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64 | if ( option.dataType( name ) == TpString ) { |
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65 | // should be "xx%" format |
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66 | String fstr = option.asString( name ) ; |
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67 | fstr = fstr.substr(0,fstr.size()-1) ; |
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68 | fraction_ = String::toFloat( fstr ) * 0.01 ; |
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69 | } |
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70 | else { |
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71 | fraction_ = option.asFloat( name ) ; |
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72 | } |
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73 | } |
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74 | else { |
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75 | fraction_ = 0.1 ; // default is 10% |
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76 | } |
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77 | |
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78 | name = "width" ; |
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79 | if ( option.isDefined( name ) ) { |
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80 | width_ = option.asFloat( name ) ; |
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81 | } |
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82 | else { |
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83 | width_ = 0.5 ; // default is half of median separation |
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84 | } |
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85 | |
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86 | name = "elongated" ; |
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87 | if ( option.isDefined( name ) ) { |
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88 | elongated_ = option.asBool( name ) ; |
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89 | } |
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90 | else { |
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91 | elongated_ = False ; // default is two-dimensional processing |
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92 | } |
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93 | |
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94 | os_ << "OPTION SUMMARY: " << endl |
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95 | << " fraction=" << fraction_ << endl |
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96 | << " width=" << width_ << endl |
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97 | << " elongated=" << (elongated_ ? "True" : "False") << LogIO::POST ; |
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98 | } |
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99 | |
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100 | void GenericEdgeDetector::topixel() |
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101 | { |
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102 | // os_.origin(LogOrigin( "GenericEdgeDetector", "topixel", WHERE )) ; |
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103 | |
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104 | setup() ; |
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105 | // using DirectionCoordinate |
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106 | Matrix<Double> xform(2,2) ; |
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107 | xform = 0.0 ; |
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108 | xform.diagonal() = 1.0 ; |
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109 | DirectionCoordinate coord( MDirection::J2000, |
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110 | Projection( Projection::SIN ), |
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111 | cenx_, ceny_, |
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112 | dx_, dy_, |
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113 | xform, |
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114 | 0.5*Double(nx_-1), |
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115 | 0.5*Double(ny_-1) ) ; |
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116 | Double *pdir_p = new Double[dir_.nelements()] ; |
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117 | pdir_.takeStorage( dir_.shape(), pdir_p, TAKE_OVER ) ; |
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118 | uInt len = time_.nelements() ; |
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119 | Bool b ; |
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120 | Double *dir_p = dir_.getStorage( b ) ; |
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121 | Double *wdir_p = dir_p ; |
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122 | Vector<Double> world ; |
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123 | Vector<Double> pixel ; |
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124 | IPosition vshape( 1, 2 ) ; |
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125 | for ( uInt i = 0 ; i < len ; i++ ) { |
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126 | world.takeStorage( vshape, wdir_p, SHARE ) ; |
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127 | pixel.takeStorage( vshape, pdir_p, SHARE ) ; |
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128 | coord.toPixel( pixel, world ) ; |
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129 | pdir_p += 2 ; |
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130 | wdir_p += 2 ; |
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131 | } |
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132 | dir_.putStorage( dir_p, b ) ; |
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133 | } |
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134 | |
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135 | void GenericEdgeDetector::setup() |
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136 | { |
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137 | os_.origin(LogOrigin( "GenericEdgeDetector", "setup", WHERE )) ; |
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138 | |
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139 | Double xmax, xmin, ymax, ymin ; |
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140 | minMax( xmin, xmax, dir_.row( 0 ) ) ; |
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141 | minMax( ymin, ymax, dir_.row( 1 ) ) ; |
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142 | Double wx = ( xmax - xmin ) * 1.1 ; |
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143 | Double wy = ( ymax - ymin ) * 1.1 ; |
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144 | |
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145 | cenx_ = 0.5 * ( xmin + xmax ) ; |
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146 | ceny_ = 0.5 * ( ymin + ymax ) ; |
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147 | Double decCorr = cos( ceny_ ) ; |
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148 | |
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149 | uInt len = time_.nelements() ; |
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150 | Matrix<Double> dd = dir_.copy() ; |
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151 | for ( uInt i = len-1 ; i > 0 ; i-- ) { |
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152 | //dd(0,i) = ( dd(0,i) - dd(0,i-1) ) * decCorr ; |
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153 | dd(0,i) = ( dd(0,i) - dd(0,i-1) ) * cos( 0.5*(dd(1,i-1)+dd(1,i)) ) ; |
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154 | dd(1,i) = dd(1,i) - dd(1,i-1) ; |
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155 | } |
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156 | Vector<Double> dr( len-1 ) ; |
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157 | Bool b ; |
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158 | const Double *dir_p = dd.getStorage( b ) ; |
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159 | const Double *x_p = dir_p + 2 ; |
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160 | const Double *y_p = dir_p + 3 ; |
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161 | for ( uInt i = 0 ; i < len-1 ; i++ ) { |
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162 | dr[i] = sqrt( (*x_p) * (*x_p) + (*y_p) * (*y_p) ) ; |
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163 | x_p += 2 ; |
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164 | y_p += 2 ; |
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165 | } |
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166 | dir_.freeStorage( dir_p, b ) ; |
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167 | Double med = median( dr, False, True, True ) ; |
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168 | dy_ = med * width_ ; |
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169 | dx_ = dy_ / decCorr ; |
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170 | |
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171 | Double nxTemp = ceil(wx / dx_); |
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172 | Double nyTemp = ceil(wy / dy_); |
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173 | if (nxTemp > (Double)UINT_MAX || nyTemp > (Double)UINT_MAX) { |
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174 | throw AipsError("Error in setup: Too large number of pixels."); |
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175 | } |
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176 | nx_ = uInt( nxTemp ) ; |
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177 | ny_ = uInt( nyTemp ) ; |
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178 | |
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179 | pcenx_ = 0.5 * Double( nx_ - 1 ) ; |
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180 | pceny_ = 0.5 * Double( ny_ - 1 ) ; |
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181 | |
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182 | os_ << LogIO::DEBUGGING |
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183 | << "rangex=(" << xmin << "," << xmax << ")" << endl |
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184 | << "rangey=(" << ymin << "," << ymax << ")" << endl |
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185 | << "median separation between pointings: " << med << endl |
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186 | << "dx=" << dx_ << ", dy=" << dy_ << endl |
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187 | << "wx=" << wx << ", wy=" << wy << endl |
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188 | << "nx=" << nx_ << ", ny=" << ny_ << LogIO::POST ; |
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189 | } |
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190 | |
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191 | void GenericEdgeDetector::countup() |
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192 | { |
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193 | os_.origin(LogOrigin( "GenericEdgeDetector", "countup", WHERE )) ; |
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194 | |
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195 | try { |
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196 | size_t n = (size_t)nx_ * (size_t)ny_; |
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197 | uInt *a_p = new uInt[n] ; |
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198 | apix_.takeStorage( IPosition(2,nx_,ny_), a_p, TAKE_OVER ) ; |
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199 | } |
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200 | catch (std::bad_alloc const &e) { |
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201 | os_ << LogIO::SEVERE << "Failed to allocate working array" << LogIO::POST; |
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202 | throw e; |
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203 | } |
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204 | catch (...) { |
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205 | os_ << LogIO::SEVERE << "Failed due to unknown error" << LogIO::POST; |
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206 | throw; |
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207 | } |
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208 | apix_ = 0 ; |
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209 | |
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210 | uInt len = time_.nelements() ; |
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211 | uInt ix ; |
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212 | uInt iy ; |
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213 | // pdir_ is always contiguous |
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214 | const Double *pdir_p = pdir_.data() ; |
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215 | const Double *px_p = pdir_p ; |
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216 | const Double *py_p = pdir_p + 1 ; |
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217 | long offset ; |
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218 | // apix_ is always contiguous |
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219 | uInt *a_p = apix_.data(); |
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220 | for ( uInt i = 0 ; i < len ; i++ ) { |
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221 | ix = uInt(round( *px_p )) ; |
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222 | iy = uInt(round( *py_p )) ; |
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223 | offset = ix + iy * nx_ ; |
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224 | *(a_p+offset) += 1 ; |
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225 | px_p += 2 ; |
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226 | py_p += 2 ; |
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227 | } |
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228 | |
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229 | os_ << LogIO::DEBUGGING |
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230 | << "a.max()=" << max(apix_) << ",a.min()=" << min(apix_) << LogIO::POST ; |
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231 | } |
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232 | |
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233 | void GenericEdgeDetector::thresholding() |
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234 | { |
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235 | uInt len = apix_.nelements() ; |
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236 | uInt *a_p = apix_.data() ; |
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237 | for ( uInt i = 0 ; i < len ; i++ ) { |
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238 | *a_p = ((*a_p > 0) ? 1 : 0) ; |
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239 | a_p++ ; |
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240 | } |
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241 | } |
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242 | |
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243 | void GenericEdgeDetector::labeling() |
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244 | { |
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245 | os_.origin(LogOrigin( "GenericEdgeDetector", "labeling", WHERE )) ; |
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246 | |
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247 | uInt n = 1 ; |
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248 | uInt niter = 0 ; |
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249 | const uInt maxiter = 100 ; |
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250 | while ( n > 0 && niter < maxiter ) { |
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251 | n = _labeling() ; |
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252 | os_ << LogIO::DEBUGGING |
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253 | << "cycle " << niter << ": labeled " << n << " pixels" << LogIO::POST ; |
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254 | niter++ ; |
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255 | } |
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256 | if ( niter == maxiter ) { |
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257 | // WARN |
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258 | os_ << LogIO::WARN << "labeling not converged before maxiter=" << maxiter << LogIO::POST ; |
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259 | } |
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260 | } |
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261 | |
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262 | uInt GenericEdgeDetector::_labeling() |
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263 | { |
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264 | uInt n = 0 ; |
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265 | for ( uInt ix = 0 ; ix < nx_ ; ix++ ) { |
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266 | Vector<uInt> v( apix_.row( ix ) ) ; |
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267 | uInt nx = __labeling( v ) ; |
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268 | n += nx ; |
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269 | } |
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270 | for ( uInt iy = 0 ; iy < ny_ ; iy++ ) { |
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271 | Vector<uInt> v( apix_.column( iy ) ) ; |
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272 | uInt ny = __labeling( v ) ; |
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273 | n += ny ; |
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274 | } |
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275 | return n ; |
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276 | } |
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277 | |
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278 | uInt GenericEdgeDetector::__labeling( Vector<uInt> &a ) |
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279 | { |
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280 | uInt n = 0 ; |
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281 | if ( allEQ( a, n ) ) { |
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282 | return n ; |
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283 | } |
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284 | |
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285 | uInt start ; |
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286 | uInt end ; |
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287 | _search( start, end, a ) ; |
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288 | for ( uInt i = start+1 ; i < end ; i++ ) { |
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289 | if ( a[i] == 0 ) { |
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290 | a[i] = 1 ; |
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291 | n++ ; |
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292 | } |
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293 | } |
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294 | return n ; |
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295 | } |
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296 | |
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297 | void GenericEdgeDetector::_search( uInt &start, |
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298 | uInt &end, |
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299 | const Vector<uInt> &a ) |
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300 | { |
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301 | uInt n = a.nelements() ; |
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302 | start = 0 ; |
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303 | while( a[start] == 0 ) { |
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304 | start++ ; |
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305 | } |
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306 | end = n - 1 ; |
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307 | while( a[end] == 0 ) { |
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308 | end-- ; |
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309 | } |
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310 | } |
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311 | |
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312 | void GenericEdgeDetector::trimming() |
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313 | { |
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314 | os_.origin(LogOrigin( "GenericEdgeDetector", "trimming", WHERE )) ; |
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315 | |
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316 | const uInt n1 = sum( apix_ ) ; |
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317 | const uInt nTrim = uInt(ceil( n1 * fraction_ )) ; |
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318 | os_ << LogIO::DEBUGGING |
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319 | << "number of nonzero pixel: " << n1 << endl |
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320 | << "number of pixels to be trimmed: " << nTrim << LogIO::POST ; |
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321 | uInt n = 0 ; |
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322 | uInt niter = 0 ; |
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323 | const uInt maxiter = 100 ; |
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324 | if ( !elongated_ ) { |
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325 | while ( n < nTrim && niter < maxiter ) { |
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326 | uInt m = _trimming() ; |
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327 | os_ << LogIO::DEBUGGING |
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328 | << "cycle " << niter << ": trimmed " << m << " pixels" << LogIO::POST ; |
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329 | n += m ; |
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330 | niter++ ; |
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331 | } |
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332 | } |
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333 | else if ( nx_ > ny_ ) { |
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334 | os_ << "1D triming along x-axis" << LogIO::POST ; |
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335 | while ( n < nTrim && niter < maxiter ) { |
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336 | uInt m = _trimming1DX() ; |
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337 | os_ << LogIO::DEBUGGING |
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338 | << "cycle " << niter << ": trimmed " << m << " pixels" << LogIO::POST ; |
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339 | n += m ; |
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340 | niter++ ; |
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341 | } |
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342 | } |
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343 | else { // nx_ < ny_ |
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344 | os_ << "1D triming along y-axis" << LogIO::POST ; |
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345 | while ( n < nTrim && niter < maxiter ) { |
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346 | uInt m = _trimming1DY() ; |
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347 | os_ << LogIO::DEBUGGING |
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348 | << "cycle " << niter << ": trimmed " << m << " pixels" << LogIO::POST ; |
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349 | n += m ; |
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350 | niter++ ; |
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351 | } |
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352 | } |
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353 | os_ << LogIO::DEBUGGING |
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354 | << "number of pixels actually trimmed: " << n << LogIO::POST ; |
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355 | |
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356 | if ( niter == maxiter ) { |
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357 | // WARN |
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358 | os_ << LogIO::WARN << "trimming not converged before maxiter=" << maxiter << LogIO::POST ; |
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359 | } |
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360 | } |
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361 | |
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362 | uInt GenericEdgeDetector::_trimming() |
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363 | { |
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364 | uInt n = 0 ; |
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365 | Block<uInt> flatIdxList( apix_.nelements() ) ; |
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366 | uInt start ; |
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367 | uInt end ; |
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368 | uInt flatIdx ; |
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369 | for ( uInt ix = 0 ; ix < nx_ ; ix++ ) { |
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370 | Vector<uInt> v( apix_.row( ix ) ) ; |
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371 | if ( allEQ( v, (uInt)0 ) ) { |
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372 | continue ; |
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373 | } |
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374 | _search( start, end, v ) ; |
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375 | uInt offset = start * nx_ ; |
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376 | flatIdx = offset + ix ; |
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377 | flatIdxList[n++] = flatIdx ; |
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378 | if ( start != end ) { |
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379 | offset = end * nx_ ; |
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380 | flatIdx = offset + ix ; |
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381 | flatIdxList[n++] = flatIdx ; |
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382 | } |
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383 | } |
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384 | for ( uInt iy = 0 ; iy < ny_ ; iy++ ) { |
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385 | Vector<uInt> v( apix_.column( iy ) ) ; |
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386 | if ( allEQ( v, (uInt)0 ) ) { |
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387 | continue ; |
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388 | } |
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389 | uInt offset = iy * nx_ ; |
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390 | _search( start, end, v ) ; |
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391 | flatIdx = offset + start ; |
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392 | flatIdxList[n++] = flatIdx ; |
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393 | if ( start != end ) { |
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394 | flatIdx = offset + end ; |
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395 | flatIdxList[n++] = flatIdx ; |
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396 | } |
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397 | } |
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398 | n = genSort( flatIdxList.storage(), |
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399 | n, |
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400 | Sort::Ascending, |
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401 | Sort::QuickSort | Sort::NoDuplicates ) ; |
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402 | Vector<uInt> v( IPosition(1,apix_.nelements()), apix_.data(), SHARE ) ; |
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403 | const uInt *idx_p = flatIdxList.storage() ; |
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404 | for ( uInt i = 0 ; i < n ; i++ ) { |
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405 | v[*idx_p] = 0 ; |
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406 | idx_p++ ; |
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407 | } |
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408 | |
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409 | return n ; |
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410 | } |
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411 | |
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412 | uInt GenericEdgeDetector::_trimming1DX() |
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413 | { |
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414 | uInt n = 0 ; |
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415 | const uInt nx = apix_.nrow() ; |
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416 | Vector<uInt> v1, v2 ; |
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417 | uInt ix, jx ; |
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418 | for ( ix = 0 ; ix < nx_ ; ix++ ) { |
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419 | v1.reference( apix_.row( ix ) ) ; |
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420 | if ( anyNE( v1, n ) ) break ; |
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421 | } |
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422 | for ( jx = nx-1 ; jx > ix ; jx-- ) { |
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423 | v2.reference( apix_.row( jx ) ) ; |
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424 | if ( anyNE( v2, n ) ) break ; |
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425 | } |
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426 | n += _trimming1D( v1 ) ; |
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427 | if ( ix != jx ) |
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428 | n+= _trimming1D( v2 ) ; |
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429 | |
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430 | return n ; |
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431 | } |
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432 | |
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433 | uInt GenericEdgeDetector::_trimming1DY() |
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434 | { |
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435 | uInt n = 0 ; |
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436 | const uInt ny = apix_.ncolumn() ; |
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437 | Vector<uInt> v1, v2 ; |
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438 | uInt iy, jy ; |
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439 | for ( iy = 0 ; iy < ny_ ; iy++ ) { |
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440 | v1.reference( apix_.column( iy ) ) ; |
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441 | if ( anyNE( v1, n ) ) break ; |
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442 | } |
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443 | for ( jy = ny-1 ; jy > iy ; jy-- ) { |
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444 | v2.reference( apix_.column( jy ) ) ; |
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445 | if ( anyNE( v2, n ) ) break ; |
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446 | } |
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447 | n += _trimming1D( v1 ) ; |
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448 | if ( iy != jy ) |
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449 | n+= _trimming1D( v2 ) ; |
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450 | |
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451 | return n ; |
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452 | } |
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453 | |
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454 | uInt GenericEdgeDetector::_trimming1D( Vector<uInt> &a ) |
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455 | { |
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456 | uInt len = a.nelements() ; |
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457 | uInt n = 0 ; |
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458 | for ( uInt i = 0 ; i < len ; i++ ) { |
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459 | if ( a[i] == 1 ) { |
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460 | a[i] = 0 ; |
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461 | n++ ; |
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462 | } |
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463 | } |
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464 | |
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465 | return n ; |
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466 | } |
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467 | |
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468 | void GenericEdgeDetector::selection() |
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469 | { |
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470 | // os_.origin(LogOrigin( "GenericEdgeDetector", "selection", WHERE )) ; |
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471 | |
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472 | uInt nrow = pdir_.shape()[1] ; |
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473 | const Double *px_p = pdir_.data() ; |
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474 | const Double *py_p = px_p + 1 ; |
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475 | Vector<uInt> v( IPosition(1,apix_.nelements()), apix_.data(), SHARE ) ; |
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476 | uInt n = 0 ; |
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477 | for ( uInt irow = 0 ; irow < nrow ; irow++ ) { |
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478 | uInt idx = int(round(*px_p)) + int(round(*py_p)) * nx_ ; |
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479 | if ( v[idx] == 0 ) { |
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480 | tempuInt_[n++] = irow ; |
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481 | } |
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482 | px_p += 2 ; |
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483 | py_p += 2 ; |
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484 | } |
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485 | off_ = vectorFromTempStorage( n ) ; |
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486 | } |
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487 | |
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488 | void GenericEdgeDetector::tuning() |
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489 | { |
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490 | os_.origin(LogOrigin( "GenericEdgeDetector", "tuning", WHERE )) ; |
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491 | |
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492 | const uInt len = off_.nelements() ; |
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493 | if ( len == 0 ) |
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494 | return ; |
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495 | |
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496 | Block<uInt> diff( len-1 ) ; |
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497 | for ( uInt i = 0 ; i < len-1 ; i++ ) { |
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498 | diff[i] = off_[i+1] - off_[i] ; |
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499 | } |
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500 | const uInt threshold = 3 ; |
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501 | uInt n = 0 ; |
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502 | for ( uInt i = 0 ; i < len ; i++ ) { |
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503 | tempuInt_[n++] = off_[i] ; |
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504 | } |
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505 | for ( uInt i = 1 ; i < len ; i++ ) { |
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506 | uInt ii = i - 1 ; |
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507 | if ( diff[ii] != 1 && diff[ii] < threshold ) { |
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508 | uInt t = off_[ii]+1 ; |
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509 | uInt u = off_[i] ; |
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510 | for ( uInt j = t ; j < u ; j++ ) { |
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511 | os_ << LogIO::DEBUGGING |
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512 | << "move " << j << " from ON to OFF" << LogIO::POST ; |
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513 | tempuInt_[n++] = j ; |
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514 | } |
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515 | } |
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516 | } |
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517 | if ( n > len ) { |
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518 | off_.resize() ; |
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519 | off_ = vectorFromTempStorage( n ) ; |
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520 | } |
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521 | } |
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522 | |
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523 | } // namespace asap |
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