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annotate Framework/ColorSpaces.cpp @ 334:f011fc199b6a default tip

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 18 Oct 2024 15:44:18 +0200
parents c42083d50ddf
children
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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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24 #include "ColorSpaces.h"
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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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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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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 }