Mercurial > hg > orthanc
annotate Plugins/Samples/GdcmDecoding/Plugin.cpp @ 985:0bfdfc0c6b9b plugins
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 01 Jul 2014 15:22:14 +0200 |
parents | 80d4f1618b33 |
children | 501880d76474 |
rev | line source |
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983
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Sample plugin to replace DCMTK by GDCM when decoding images
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1 /** |
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Sample plugin to replace DCMTK by GDCM when decoding images
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2 * Orthanc - A Lightweight, RESTful DICOM Store |
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3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege, |
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4 * Belgium |
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5 * |
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6 * Permission is hereby granted, free of charge, to any person |
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7 * obtaining a copy of this software and associated documentation |
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8 * files (the "Software"), to deal in the Software without |
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Sample plugin to replace DCMTK by GDCM when decoding images
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9 * restriction, including without limitation the rights to use, copy, |
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Sample plugin to replace DCMTK by GDCM when decoding images
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10 * modify, merge, publish, distribute, sublicense, and/or sell copies |
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Sample plugin to replace DCMTK by GDCM when decoding images
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11 * of the Software, and to permit persons to whom the Software is |
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12 * furnished to do so, subject to the following conditions: |
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13 * |
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14 * The above copyright notice and this permission notice shall be |
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15 * included in all copies or substantial portions of the Software. |
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16 * |
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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Sample plugin to replace DCMTK by GDCM when decoding images
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20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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21 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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22 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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24 * SOFTWARE. |
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25 **/ |
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26 |
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27 |
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28 #include <map> |
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29 #include <string> |
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30 #include <stdexcept> |
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31 #include <sstream> |
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32 |
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33 #include "OrthancContext.h" |
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34 #include "../../../Core/ImageFormats/ImageProcessing.h" |
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35 |
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36 #include <gdcmReader.h> |
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37 #include <gdcmImageReader.h> |
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38 |
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39 |
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40 static bool GetOrthancPixelFormat(Orthanc::PixelFormat& format, |
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41 const gdcm::Image& image) |
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42 { |
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43 if (image.GetPlanarConfiguration() != 0 && |
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44 image.GetPixelFormat().GetSamplesPerPixel() != 1) |
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45 { |
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46 OrthancContext::GetInstance().LogError("Planar configurations are not supported"); |
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47 return false; |
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48 } |
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49 |
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50 if (image.GetPixelFormat().GetSamplesPerPixel() == 1) |
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51 { |
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52 switch (image.GetPixelFormat().GetScalarType()) |
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53 { |
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54 case gdcm::PixelFormat::UINT8: |
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55 format = Orthanc::PixelFormat_Grayscale8; |
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56 return true; |
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57 |
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58 case gdcm::PixelFormat::UINT16: |
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59 format = Orthanc::PixelFormat_Grayscale16; |
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60 return true; |
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61 |
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62 case gdcm::PixelFormat::INT16: |
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63 format = Orthanc::PixelFormat_SignedGrayscale16; |
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64 return true; |
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65 |
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66 default: |
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67 return false; |
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68 } |
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69 } |
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70 else if (image.GetPixelFormat().GetSamplesPerPixel() == 3 && |
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71 image.GetPixelFormat().GetScalarType() == gdcm::PixelFormat::UINT8) |
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72 { |
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73 format = Orthanc::PixelFormat_RGB24; |
985 | 74 return true; |
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75 } |
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76 else if (image.GetPixelFormat().GetSamplesPerPixel() == 4 && |
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77 image.GetPixelFormat().GetScalarType() == gdcm::PixelFormat::UINT8) |
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78 { |
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79 format = Orthanc::PixelFormat_RGBA32; |
985 | 80 return true; |
983
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81 } |
985 | 82 |
983
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83 return false; |
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84 } |
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85 |
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86 |
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87 ORTHANC_PLUGINS_API int32_t DecodeImage(OrthancPluginRestOutput* output, |
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88 const char* url, |
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89 const OrthancPluginHttpRequest* request) |
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90 { |
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91 std::string instance(request->groups[0]); |
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92 std::string outputFormat(request->groups[1]); |
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93 OrthancContext::GetInstance().LogWarning("Using GDCM to decode instance " + instance); |
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94 |
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95 // Download the request DICOM instance from Orthanc into a memory buffer |
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96 std::string dicom; |
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97 OrthancContext::GetInstance().GetDicomForInstance(dicom, instance); |
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98 |
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99 // Prepare a memory stream over the DICOM instance |
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100 std::stringstream stream(dicom); |
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101 |
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102 // Parse the DICOM instance using GDCM |
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103 gdcm::ImageReader imageReader; |
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104 imageReader.SetStream(stream); |
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105 if (!imageReader.Read()) |
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106 { |
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107 OrthancContext::GetInstance().LogError("GDCM cannot extract an image from this DICOM instance"); |
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108 return -1; // Error |
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109 } |
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110 |
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111 gdcm::Image& image = imageReader.GetImage(); |
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112 |
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113 // Log information about the decoded image |
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114 char tmp[1024]; |
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115 sprintf(tmp, "Image format: %dx%d %s with %d color channel(s)", image.GetRows(), image.GetColumns(), |
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116 image.GetPixelFormat().GetScalarTypeAsString(), image.GetPixelFormat().GetSamplesPerPixel()); |
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117 OrthancContext::GetInstance().LogWarning(tmp); |
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118 |
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119 // Create a read-only accessor to the bitmap decoded by GDCM |
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120 Orthanc::PixelFormat format; |
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121 if (!GetOrthancPixelFormat(format, image)) |
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122 { |
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123 OrthancContext::GetInstance().LogError("This sample plugin does not support this image format"); |
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124 return -1; // Error |
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125 } |
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126 |
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127 Orthanc::ImageAccessor decodedImage; |
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128 std::vector<char> decodedBuffer(image.GetBufferLength()); |
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129 |
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130 if (decodedBuffer.size()) |
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131 { |
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132 image.GetBuffer(&decodedBuffer[0]); |
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133 unsigned int pitch = image.GetColumns() * ::Orthanc::GetBytesPerPixel(format); |
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134 decodedImage.AssignWritable(format, image.GetColumns(), image.GetRows(), pitch, &decodedBuffer[0]); |
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135 } |
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136 else |
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137 { |
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138 // Empty image |
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139 decodedImage.AssignWritable(format, 0, 0, 0, NULL); |
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140 } |
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141 |
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142 |
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143 // Convert the pixel format from GDCM to the format requested by the REST query |
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144 Orthanc::ImageBuffer converted; |
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145 converted.SetWidth(decodedImage.GetWidth()); |
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146 converted.SetHeight(decodedImage.GetHeight()); |
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147 |
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148 if (outputFormat == "preview") |
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149 { |
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150 if (format == Orthanc::PixelFormat_RGB24 || |
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151 format == Orthanc::PixelFormat_RGBA32) |
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152 { |
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153 // Do not rescale color image |
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154 converted.SetFormat(Orthanc::PixelFormat_RGB24); |
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155 } |
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156 else |
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157 { |
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158 converted.SetFormat(Orthanc::PixelFormat_Grayscale8); |
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159 |
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160 // Rescale the image to the [0,255] range |
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161 int64_t a, b; |
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162 Orthanc::ImageProcessing::GetMinMaxValue(a, b, decodedImage); |
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163 |
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164 float offset = -a; |
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165 float scaling = 255.0f / static_cast<float>(b - a); |
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166 Orthanc::ImageProcessing::ShiftScale(decodedImage, offset, scaling); |
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167 } |
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168 } |
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169 else if (outputFormat == "image-uint8") |
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170 { |
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171 converted.SetFormat(Orthanc::PixelFormat_Grayscale8); |
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172 } |
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173 else if (outputFormat == "image-uint16") |
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174 { |
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175 converted.SetFormat(Orthanc::PixelFormat_Grayscale16); |
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176 } |
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177 else if (outputFormat == "image-int16") |
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178 { |
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179 converted.SetFormat(Orthanc::PixelFormat_SignedGrayscale16); |
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180 } |
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181 else |
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182 { |
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183 OrthancContext::GetInstance().LogError("Unknown output format: " + outputFormat); |
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184 return -1; |
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185 } |
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186 |
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187 Orthanc::ImageAccessor convertedAccessor(converted.GetAccessor()); |
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188 Orthanc::ImageProcessing::Convert(convertedAccessor, decodedImage); |
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189 |
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190 |
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191 // Compress the converted image as a PNG file |
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192 OrthancContext::GetInstance().CompressAndAnswerPngImage(output, convertedAccessor); |
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193 |
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194 return 0; // Success |
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195 } |
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196 |
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197 |
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198 extern "C" |
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199 { |
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200 ORTHANC_PLUGINS_API int32_t OrthancPluginInitialize(OrthancPluginContext* context) |
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201 { |
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202 OrthancContext::GetInstance().Initialize(context); |
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203 OrthancContext::GetInstance().LogWarning("Initializing GDCM decoding"); |
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204 OrthancContext::GetInstance().Register("/instances/([^/]+)/(preview|image-uint8|image-uint16|image-int16)", DecodeImage); |
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205 return 0; |
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206 } |
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207 |
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208 ORTHANC_PLUGINS_API void OrthancPluginFinalize() |
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209 { |
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210 OrthancContext::GetInstance().LogWarning("Finalizing GDCM decoding"); |
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211 OrthancContext::GetInstance().Finalize(); |
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212 } |
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213 |
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214 ORTHANC_PLUGINS_API const char* OrthancPluginGetName() |
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215 { |
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216 return "gdcm-decoding"; |
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217 } |
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218 |
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219 ORTHANC_PLUGINS_API const char* OrthancPluginGetVersion() |
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220 { |
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221 return "1.0"; |
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222 } |
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223 } |