Mercurial > hg > orthanc-wsi
annotate Framework/ColorSpaces.cpp @ 331:cf828b381bc9
cppcheck
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 18 Oct 2024 13:16:02 +0200 |
parents | c42083d50ddf |
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rev | line source |
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1 /** |
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2 * Orthanc - A Lightweight, RESTful DICOM Store |
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
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4 * Department, University Hospital of Liege, Belgium |
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5 * Copyright (C) 2017-2023 Osimis S.A., Belgium |
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6 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium |
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium |
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8 * |
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9 * This program is free software: you can redistribute it and/or |
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10 * modify it under the terms of the GNU Affero General Public License |
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11 * as published by the Free Software Foundation, either version 3 of |
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12 * the License, or (at your option) any later version. |
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13 * |
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14 * This program is distributed in the hope that it will be useful, but |
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 * Affero General Public License for more details. |
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18 * |
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19 * You should have received a copy of the GNU Affero General Public License |
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20 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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21 **/ |
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22 |
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23 |
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24 #include "ColorSpaces.h" |
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25 |
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26 #include <SerializationToolbox.h> |
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27 #include <Toolbox.h> |
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28 |
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29 #include <boost/math/special_functions/round.hpp> |
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30 |
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31 |
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32 namespace OrthancWSI |
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33 { |
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34 RGBColor::RGBColor(const sRGBColor& srgb) |
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35 { |
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36 if (srgb.GetR() < 0) |
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37 { |
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38 r_ = 0; |
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39 } |
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40 else if (srgb.GetR() >= 1) |
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41 { |
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42 r_ = 255; |
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43 } |
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44 else |
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45 { |
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46 r_ = boost::math::iround(srgb.GetR() * 255.0f); |
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47 } |
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48 |
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49 if (srgb.GetG() < 0) |
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50 { |
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51 g_ = 0; |
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52 } |
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53 else if (srgb.GetG() >= 1) |
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54 { |
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55 g_ = 255; |
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56 } |
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57 else |
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58 { |
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59 g_ = boost::math::iround(srgb.GetG() * 255.0f); |
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60 } |
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61 |
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62 if (srgb.GetB() < 0) |
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63 { |
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64 b_ = 0; |
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65 } |
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66 else if (srgb.GetB() >= 1) |
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67 { |
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68 b_ = 255; |
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69 } |
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70 else |
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71 { |
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72 b_ = boost::math::iround(srgb.GetB() * 255.0f); |
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73 } |
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74 } |
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75 |
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76 |
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77 sRGBColor::sRGBColor(const RGBColor& rgb) |
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78 { |
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79 r_ = static_cast<float>(rgb.GetR()) / 255.0f; |
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80 g_ = static_cast<float>(rgb.GetG()) / 255.0f; |
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81 b_ = static_cast<float>(rgb.GetB()) / 255.0f; |
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82 } |
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83 |
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84 |
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85 static float ApplyGammaXYZ(float value) |
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86 { |
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87 // https://www.image-engineering.de/library/technotes/958-how-to-convert-between-srgb-and-ciexyz |
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88 if (value <= 0.0031308f) |
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89 { |
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90 return value * 12.92f; |
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91 } |
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92 else |
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93 { |
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94 return 1.055f * powf(value, 1.0f / 2.4f) - 0.055f; |
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95 } |
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96 } |
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97 |
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98 |
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99 sRGBColor::sRGBColor(const XYZColor& xyz) |
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100 { |
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101 // https://en.wikipedia.org/wiki/SRGB#From_CIE_XYZ_to_sRGB |
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102 // https://www.image-engineering.de/library/technotes/958-how-to-convert-between-srgb-and-ciexyz |
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103 const float sr = 3.2404542f * xyz.GetX() - 1.5371385f * xyz.GetY() - 0.4985314f * xyz.GetZ(); |
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104 const float sg = -0.9692660f * xyz.GetX() + 1.8760108f * xyz.GetY() + 0.0415560f * xyz.GetZ(); |
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105 const float sb = 0.0556434f * xyz.GetX() - 0.2040259f * xyz.GetY() + 1.0572252f * xyz.GetZ(); |
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106 |
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107 r_ = ApplyGammaXYZ(sr); |
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108 g_ = ApplyGammaXYZ(sg); |
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109 b_ = ApplyGammaXYZ(sb); |
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110 } |
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111 |
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112 |
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113 static float LinearizeXYZ(float value) |
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114 { |
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115 // https://www.image-engineering.de/library/technotes/958-how-to-convert-between-srgb-and-ciexyz |
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116 if (value <= 0.04045f) |
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117 { |
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118 return value / 12.92f; |
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119 } |
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120 else |
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121 { |
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122 return powf((value + 0.055f) / 1.055f, 2.4f); |
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123 } |
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124 } |
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125 |
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126 |
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127 XYZColor::XYZColor(const sRGBColor& srgb) |
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128 { |
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129 // https://en.wikipedia.org/wiki/SRGB#From_sRGB_to_CIE_XYZ |
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130 // https://www.image-engineering.de/library/technotes/958-how-to-convert-between-srgb-and-ciexyz |
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131 const float linearizedR = LinearizeXYZ(srgb.GetR()); |
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132 const float linearizedG = LinearizeXYZ(srgb.GetG()); |
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133 const float linearizedB = LinearizeXYZ(srgb.GetB()); |
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134 |
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135 x_ = 0.4124564f * linearizedR + 0.3575761f * linearizedG + 0.1804375f * linearizedB; |
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136 y_ = 0.2126729f * linearizedR + 0.7151522f * linearizedG + 0.0721750f * linearizedB; |
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137 z_ = 0.0193339f * linearizedR + 0.1191920f * linearizedG + 0.9503041f * linearizedB; |
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138 } |
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139 |
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140 |
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141 static const float LAB_DELTA = 6.0f / 29.0f; |
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142 |
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143 static float LABf_inv(float t) |
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144 { |
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145 if (t > LAB_DELTA) |
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146 { |
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147 return powf(t, 3.0f); |
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148 } |
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149 else |
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150 { |
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151 return 3.0f * LAB_DELTA * LAB_DELTA * (t - 4.0f / 29.0f); |
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152 } |
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153 } |
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154 |
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155 |
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156 // Those correspond to Standard Illuminant D65 |
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157 // https://en.wikipedia.org/wiki/CIELAB_color_space#From_CIEXYZ_to_CIELAB |
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158 static const float X_N = 95.0489f; |
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159 static const float Y_N = 100.0f; |
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160 static const float Z_N = 108.8840f; |
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161 |
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162 XYZColor::XYZColor(const LABColor& lab) |
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163 { |
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164 // https://en.wikipedia.org/wiki/CIELAB_color_space#From_CIELAB_to_CIEXYZ |
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165 const float shared = (lab.GetL() + 16.0f) / 116.0f; |
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166 |
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167 x_ = X_N * LABf_inv(shared + lab.GetA() / 500.0f) / 100.0f; |
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168 y_ = Y_N * LABf_inv(shared) / 100.0f; |
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169 z_ = Z_N * LABf_inv(shared - lab.GetB() / 200.0f) / 100.0f; |
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170 } |
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171 |
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172 |
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173 static float LABf(float t) |
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174 { |
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175 if (t > powf(LAB_DELTA, 3.0f)) |
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176 { |
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177 return powf(t, 1.0f / 3.0f); |
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178 } |
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179 else |
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180 { |
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181 return t / 3.0f * powf(LAB_DELTA, -2.0f) + 4.0f / 29.0f; |
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182 } |
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183 } |
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184 |
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185 |
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186 LABColor::LABColor(const XYZColor& xyz) |
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187 { |
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188 // https://en.wikipedia.org/wiki/CIELAB_color_space#From_CIEXYZ_to_CIELAB |
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189 |
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190 const float fx = LABf(xyz.GetX() * 100.0f / X_N); |
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191 const float fy = LABf(xyz.GetY() * 100.0f / Y_N); |
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192 const float fz = LABf(xyz.GetZ() * 100.0f / Z_N); |
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193 |
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194 l_ = 116.0f * fy - 16.0f; |
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195 a_ = 500.0f * (fx - fy); |
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196 b_ = 200.0f * (fy - fz); |
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197 } |
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198 |
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199 |
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200 static uint16_t EncodeUint16(float value, |
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201 float minValue, |
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202 float maxValue) |
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203 { |
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204 if (value <= minValue) |
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205 { |
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206 return 0; |
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207 } |
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208 else if (value >= maxValue) |
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209 { |
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210 return 0xffff; |
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211 } |
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212 else |
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213 { |
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214 float lambda = (value - minValue) / (maxValue - minValue); |
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215 assert(lambda >= 0 && lambda <= 1); |
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216 return static_cast<uint16_t>(boost::math::iround(lambda * static_cast<float>(0xffff))); |
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217 } |
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218 } |
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219 |
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220 |
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221 void LABColor::EncodeDicomRecommendedAbsentPixelCIELab(uint16_t target[3]) const |
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222 { |
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223 /** |
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224 * "An L value linearly scaled to 16 bits, such that 0x0000 |
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225 * corresponds to an L of 0.0, and 0xFFFF corresponds to an L of |
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226 * 100.0." |
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227 **/ |
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228 target[0] = EncodeUint16(GetL(), 0.0f, 100.0f); |
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229 |
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230 /** |
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231 * "An a* then a b* value, each linearly scaled to 16 bits and |
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232 * offset to an unsigned range, such that 0x0000 corresponds to an |
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233 * a* or b* of -128.0, 0x8080 corresponds to an a* or b* of 0.0 |
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234 * and 0xFFFF corresponds to an a* or b* of 127.0" |
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235 **/ |
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236 target[1] = EncodeUint16(GetA(), -128.0f, 127.0f); |
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237 target[2] = EncodeUint16(GetB(), -128.0f, 127.0f); |
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238 } |
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239 |
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240 |
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241 LABColor LABColor::DecodeDicomRecommendedAbsentPixelCIELab(uint16_t l, |
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242 uint16_t a, |
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243 uint16_t b) |
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244 { |
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245 return LABColor(static_cast<float>(l) / static_cast<float>(0xffff) * 100.0f, |
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246 -128.0f + static_cast<float>(a) / static_cast<float>(0xffff) * 255.0f, |
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247 -128.0f + static_cast<float>(b) / static_cast<float>(0xffff) * 255.0f); |
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248 } |
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249 |
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250 |
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251 bool LABColor::DecodeDicomRecommendedAbsentPixelCIELab(LABColor& target, |
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252 const std::string& tag) |
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253 { |
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254 std::vector<std::string> channels; |
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255 Orthanc::Toolbox::TokenizeString(channels, tag, '\\'); |
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256 |
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257 unsigned int l, a, b; |
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258 if (channels.size() == 3 && |
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259 Orthanc::SerializationToolbox::ParseUnsignedInteger32(l, channels[0]) && |
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260 Orthanc::SerializationToolbox::ParseUnsignedInteger32(a, channels[1]) && |
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261 Orthanc::SerializationToolbox::ParseUnsignedInteger32(b, channels[2]) && |
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262 l <= 0xffffu && |
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263 a <= 0xffffu && |
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264 b <= 0xffffu) |
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265 { |
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266 target = LABColor::DecodeDicomRecommendedAbsentPixelCIELab(l, a, b); |
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267 return true; |
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268 } |
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269 else |
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270 { |
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271 return false; |
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272 } |
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273 } |
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274 } |