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1 /**
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2 * Stone of Orthanc
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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 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "DicomFrameConverter.h"
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34
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35 #include "../Orthanc/Core/Images/Image.h"
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36 #include "../Orthanc/Core/Images/ImageProcessing.h"
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37 #include "../Orthanc/Core/OrthancException.h"
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38 #include "../Orthanc/Core/Toolbox.h"
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39
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40 namespace OrthancStone
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41 {
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42 void DicomFrameConverter::SetDefaultParameters()
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43 {
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44 isSigned_ = true;
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45 isColor_ = false;
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46 hasRescale_ = false;
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47 rescaleIntercept_ = 0;
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48 rescaleSlope_ = 1;
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49 defaultWindowCenter_ = 128;
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50 defaultWindowWidth_ = 256;
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51 }
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52
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53
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54 Orthanc::PixelFormat DicomFrameConverter::GetExpectedPixelFormat() const
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55 {
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56 // TODO Add more checks, e.g. on the number of bytes per value
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57 // (cf. DicomImageInformation.h in Orthanc)
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58
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59 if (isColor_)
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60 {
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61 return Orthanc::PixelFormat_RGB24;
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62 }
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63 else if (isSigned_)
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64 {
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65 return Orthanc::PixelFormat_SignedGrayscale16;
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66 }
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67 else
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68 {
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69 return Orthanc::PixelFormat_Grayscale16;
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70 }
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71 }
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72
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73
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74 void DicomFrameConverter::ReadParameters(const DicomDataset& dicom)
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75 {
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76 SetDefaultParameters();
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77
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78 if (dicom.HasTag(DICOM_TAG_WINDOW_CENTER))
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79 {
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80 Vector c, w;
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81 dicom.GetVectorValue(c, DICOM_TAG_WINDOW_CENTER);
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82 dicom.GetVectorValue(w, DICOM_TAG_WINDOW_WIDTH);
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83
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84 if (c.size() > 0 && w.size() > 0)
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85 {
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86 defaultWindowCenter_ = static_cast<float>(c[0]);
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87 defaultWindowWidth_ = static_cast<float>(w[0]);
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88 }
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89 }
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90
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91 isSigned_ = (dicom.GetIntegerValue(DICOM_TAG_PIXEL_REPRESENTATION) == 1); // Type 1 tag, must be present
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92
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93 if (dicom.HasTag(DICOM_TAG_RESCALE_INTERCEPT))
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94 {
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95 rescaleIntercept_ = dicom.GetFloatValue(DICOM_TAG_RESCALE_INTERCEPT);
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96 rescaleSlope_ = dicom.GetFloatValue(DICOM_TAG_RESCALE_SLOPE);
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97 hasRescale_ = true;
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98 }
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99
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100 std::string photometric = dicom.GetStringValue(DICOM_TAG_PHOTOMETRIC_INTERPRETATION); // Type 1 tag, must be present
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101 photometric = Orthanc::Toolbox::StripSpaces(photometric);
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102 isColor_ = (photometric != "MONOCHROME1" &&
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103 photometric != "MONOCHROME2");
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104 }
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105
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106
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107 void DicomFrameConverter::ConvertFrame(std::auto_ptr<Orthanc::ImageAccessor>& source) const
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108 {
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109 assert(sizeof(float) == 4);
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110
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111 if (source.get() == NULL)
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112 {
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113 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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114 }
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115
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116 Orthanc::PixelFormat sourceFormat = source->GetFormat();
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117
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118 if (sourceFormat != GetExpectedPixelFormat())
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119 {
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120 throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat);
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121 }
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122
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123 if (sourceFormat == Orthanc::PixelFormat_RGB24)
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124 {
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125 // No conversion has to be done
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126 return;
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127 }
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128
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129 assert(sourceFormat == Orthanc::PixelFormat_Grayscale16 ||
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130 sourceFormat == Orthanc::PixelFormat_SignedGrayscale16);
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131
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132 // This is the case of a grayscale frame. Convert it to Float32.
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133 std::auto_ptr<Orthanc::Image> converted(new Orthanc::Image(Orthanc::PixelFormat_Float32,
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134 source->GetWidth(),
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135 source->GetHeight()));
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136 Orthanc::ImageProcessing::Convert(*converted, *source);
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137
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138 source.reset(NULL); // We don't need the source frame anymore
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139
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140 // Correct rescale slope/intercept if need be
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141 if (hasRescale_)
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142 {
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143 for (unsigned int y = 0; y < converted->GetHeight(); y++)
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144 {
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145 float* p = reinterpret_cast<float*>(converted->GetRow(y));
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146 for (unsigned int x = 0; x < converted->GetWidth(); x++, p++)
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147 {
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148 float value = *p;
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149
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150 if (hasRescale_)
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151 {
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152 value = value * rescaleSlope_ + rescaleIntercept_;
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153 }
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154
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155 *p = value;
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156 }
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157 }
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158 }
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159
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160 source = converted;
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161 }
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162 }
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