Mercurial > hg > orthanc
annotate OrthancServer/Internals/DicomImageDecoder.cpp @ 854:ff530685e46a jpeg
fast version of image copy
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Fri, 06 Jun 2014 12:35:08 +0200 |
| parents | 839be3022203 |
| children | ebc41566f742 |
| rev | line source |
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| 845 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
| 3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege, | |
| 4 * Belgium | |
| 5 * | |
| 6 * This program is free software: you can redistribute it and/or | |
| 7 * modify it under the terms of the GNU General Public License as | |
| 8 * published by the Free Software Foundation, either version 3 of the | |
| 9 * License, or (at your option) any later version. | |
| 10 * | |
| 11 * In addition, as a special exception, the copyright holders of this | |
| 12 * program give permission to link the code of its release with the | |
| 13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
| 14 * that use the same license as the "OpenSSL" library), and distribute | |
| 15 * the linked executables. You must obey the GNU General Public License | |
| 16 * in all respects for all of the code used other than "OpenSSL". If you | |
| 17 * modify file(s) with this exception, you may extend this exception to | |
| 18 * your version of the file(s), but you are not obligated to do so. If | |
| 19 * you do not wish to do so, delete this exception statement from your | |
| 20 * version. If you delete this exception statement from all source files | |
| 21 * in the program, then also delete it here. | |
| 22 * | |
| 23 * This program is distributed in the hope that it will be useful, but | |
| 24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 26 * General Public License for more details. | |
| 27 * | |
| 28 * You should have received a copy of the GNU General Public License | |
| 29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 30 **/ | |
| 31 | |
| 32 | |
| 33 #include "../PrecompiledHeadersServer.h" | |
| 34 #include "DicomImageDecoder.h" | |
| 35 | |
| 846 | 36 |
| 37 /*========================================================================= | |
| 38 | |
| 39 This file is based on portions of the following project | |
| 40 (cf. function "DecodePsmctRle1()"): | |
| 41 | |
| 42 Program: GDCM (Grassroots DICOM). A DICOM library | |
| 43 Module: http://gdcm.sourceforge.net/Copyright.html | |
| 44 | |
| 45 Copyright (c) 2006-2011 Mathieu Malaterre | |
| 46 Copyright (c) 1993-2005 CREATIS | |
| 47 (CREATIS = Centre de Recherche et d'Applications en Traitement de l'Image) | |
| 48 All rights reserved. | |
| 49 | |
| 50 Redistribution and use in source and binary forms, with or without | |
| 51 modification, are permitted provided that the following conditions are met: | |
| 52 | |
| 53 * Redistributions of source code must retain the above copyright notice, | |
| 54 this list of conditions and the following disclaimer. | |
| 55 | |
| 56 * Redistributions in binary form must reproduce the above copyright notice, | |
| 57 this list of conditions and the following disclaimer in the documentation | |
| 58 and/or other materials provided with the distribution. | |
| 59 | |
| 60 * Neither name of Mathieu Malaterre, or CREATIS, nor the names of any | |
| 61 contributors (CNRS, INSERM, UCB, Universite Lyon I), may be used to | |
| 62 endorse or promote products derived from this software without specific | |
| 63 prior written permission. | |
| 64 | |
| 65 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' | |
| 66 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 67 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 68 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR | |
| 69 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 70 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 71 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
| 72 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
| 73 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 74 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 75 | |
| 76 =========================================================================*/ | |
| 77 | |
| 78 | |
| 79 | |
| 845 | 80 #include "../../Core/OrthancException.h" |
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81 #include "../../Core/ImageFormats/ImageProcessing.h" |
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82 #include "../../Core/DicomFormat/DicomIntegerPixelAccessor.h" |
| 845 | 83 #include "../ToDcmtkBridge.h" |
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84 #include "../FromDcmtkBridge.h" |
| 845 | 85 |
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86 #include <glog/logging.h> |
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87 |
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88 #include <boost/lexical_cast.hpp> |
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89 |
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90 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
| 845 | 91 #include <dcmtk/dcmjpls/djcodecd.h> |
| 92 #include <dcmtk/dcmjpls/djcparam.h> | |
| 93 #include <dcmtk/dcmjpeg/djrplol.h> | |
| 94 #endif | |
| 95 | |
| 96 | |
| 97 namespace Orthanc | |
| 98 { | |
| 852 | 99 class DicomImageDecoder::ImageSource |
| 100 { | |
| 101 private: | |
| 102 std::string psmct_; | |
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103 std::auto_ptr<DicomIntegerPixelAccessor> slowAccessor_; |
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104 std::auto_ptr<ImageAccessor> fastAccessor_; |
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105 |
| 852 | 106 public: |
| 107 void Setup(DcmDataset& dataset, | |
| 108 unsigned int frame) | |
| 109 { | |
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110 psmct_.clear(); |
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111 slowAccessor_.reset(NULL); |
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112 fastAccessor_.reset(NULL); |
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113 |
| 852 | 114 // See also: http://support.dcmtk.org/wiki/dcmtk/howto/accessing-compressed-data |
| 115 | |
| 116 DicomMap m; | |
| 117 FromDcmtkBridge::Convert(m, dataset); | |
| 118 | |
| 119 /** | |
| 120 * Create an accessor to the raw values of the DICOM image. | |
| 121 **/ | |
| 122 | |
| 123 DcmElement* e; | |
| 124 if (dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_PIXEL_DATA), e).good() && | |
| 125 e != NULL) | |
| 126 { | |
| 127 Uint8* pixData = NULL; | |
| 128 if (e->getUint8Array(pixData) == EC_Normal) | |
| 129 { | |
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130 slowAccessor_.reset(new DicomIntegerPixelAccessor(m, pixData, e->getLength())); |
| 852 | 131 } |
| 132 } | |
| 133 else if (DicomImageDecoder::DecodePsmctRle1(psmct_, dataset)) | |
| 134 { | |
| 135 LOG(INFO) << "The PMSCT_RLE1 decoding has succeeded"; | |
| 136 Uint8* pixData = NULL; | |
| 137 if (psmct_.size() > 0) | |
| 138 { | |
| 139 pixData = reinterpret_cast<Uint8*>(&psmct_[0]); | |
| 140 } | |
| 141 | |
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142 slowAccessor_.reset(new DicomIntegerPixelAccessor(m, pixData, psmct_.size())); |
| 852 | 143 } |
| 144 | |
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145 if (slowAccessor_.get() == NULL) |
| 852 | 146 { |
| 147 throw OrthancException(ErrorCode_BadFileFormat); | |
| 148 } | |
| 149 | |
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150 slowAccessor_->SetCurrentFrame(frame); |
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151 |
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152 |
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153 /** |
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154 * If possible, create a fast ImageAccessor to the image buffer. |
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155 **/ |
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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 unsigned int GetWidth() const |
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161 { |
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162 assert(slowAccessor_.get() != NULL); |
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163 return slowAccessor_->GetInformation().GetWidth(); |
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164 } |
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165 |
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166 unsigned int GetHeight() const |
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167 { |
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168 assert(slowAccessor_.get() != NULL); |
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169 return slowAccessor_->GetInformation().GetHeight(); |
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170 } |
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171 |
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172 unsigned int GetBytesPerPixel() const |
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173 { |
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174 assert(slowAccessor_.get() != NULL); |
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175 return slowAccessor_->GetInformation().GetBytesPerPixel(); |
| 852 | 176 } |
| 177 | |
| 178 unsigned int GetChannelCount() const | |
| 179 { | |
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180 assert(slowAccessor_.get() != NULL); |
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181 return slowAccessor_->GetInformation().GetChannelCount(); |
| 852 | 182 } |
| 183 | |
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184 const DicomIntegerPixelAccessor& GetAccessor() const |
| 852 | 185 { |
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186 assert(slowAccessor_.get() != NULL); |
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187 return *slowAccessor_; |
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188 } |
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189 |
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190 bool HasFastAccessor() const |
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191 { |
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192 return fastAccessor_.get() != NULL; |
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193 } |
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194 |
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195 const ImageAccessor& GetFastAccessor() const |
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196 { |
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197 assert(HasFastAccessor()); |
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198 return *fastAccessor_; |
| 852 | 199 } |
| 200 }; | |
| 201 | |
| 202 | |
| 846 | 203 static const DicomTag DICOM_TAG_CONTENT(0x07a1, 0x100a); |
| 204 static const DicomTag DICOM_TAG_COMPRESSION_TYPE(0x07a1, 0x1011); | |
| 205 | |
| 206 bool DicomImageDecoder::IsPsmctRle1(DcmDataset& dataset) | |
| 207 { | |
| 208 DcmElement* e; | |
| 209 char* c; | |
| 210 | |
| 211 // Check whether the DICOM instance contains an image encoded with | |
| 212 // the PMSCT_RLE1 scheme. | |
| 213 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_COMPRESSION_TYPE), e).good() || | |
| 214 e == NULL || | |
| 215 !e->isaString() || | |
| 216 !e->getString(c).good() || | |
| 217 c == NULL || | |
| 218 strcmp("PMSCT_RLE1", c)) | |
| 219 { | |
| 220 return false; | |
| 221 } | |
| 222 else | |
| 223 { | |
| 224 return true; | |
| 225 } | |
| 226 } | |
| 227 | |
| 228 | |
| 229 bool DicomImageDecoder::DecodePsmctRle1(std::string& output, | |
| 230 DcmDataset& dataset) | |
| 231 { | |
| 232 // Check whether the DICOM instance contains an image encoded with | |
| 233 // the PMSCT_RLE1 scheme. | |
| 234 if (!IsPsmctRle1(dataset)) | |
| 235 { | |
| 236 return false; | |
| 237 } | |
| 238 | |
| 239 // OK, this is a custom RLE encoding from Philips. Get the pixel | |
| 240 // data from the appropriate private DICOM tag. | |
| 241 Uint8* pixData = NULL; | |
| 242 DcmElement* e; | |
| 243 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_CONTENT), e).good() || | |
| 244 e == NULL || | |
| 245 e->getUint8Array(pixData) != EC_Normal) | |
| 246 { | |
| 247 return false; | |
| 248 } | |
| 249 | |
| 250 // The "unsigned" below IS VERY IMPORTANT | |
| 251 const uint8_t* inbuffer = reinterpret_cast<const uint8_t*>(pixData); | |
| 252 const size_t length = e->getLength(); | |
| 253 | |
| 254 /** | |
| 255 * The code below is an adaptation of a sample code for GDCM by | |
| 256 * Mathieu Malaterre (under a BSD license). | |
| 257 * http://gdcm.sourceforge.net/html/rle2img_8cxx-example.html | |
| 258 **/ | |
| 259 | |
| 260 // RLE pass | |
| 261 std::vector<uint8_t> temp; | |
| 262 temp.reserve(length); | |
| 263 for (size_t i = 0; i < length; i++) | |
| 264 { | |
| 265 if (inbuffer[i] == 0xa5) | |
| 266 { | |
| 267 temp.push_back(inbuffer[i+2]); | |
| 268 for (uint8_t repeat = inbuffer[i + 1]; repeat != 0; repeat--) | |
| 269 { | |
| 270 temp.push_back(inbuffer[i+2]); | |
| 271 } | |
| 272 i += 2; | |
| 273 } | |
| 274 else | |
| 275 { | |
| 276 temp.push_back(inbuffer[i]); | |
| 277 } | |
| 278 } | |
| 279 | |
| 280 // Delta encoding pass | |
| 281 uint16_t delta = 0; | |
| 282 output.clear(); | |
| 283 output.reserve(temp.size()); | |
| 284 for (size_t i = 0; i < temp.size(); i++) | |
| 285 { | |
| 286 uint16_t value; | |
| 287 | |
| 288 if (temp[i] == 0x5a) | |
| 289 { | |
| 290 uint16_t v1 = temp[i + 1]; | |
| 291 uint16_t v2 = temp[i + 2]; | |
| 292 value = (v2 << 8) + v1; | |
| 293 i += 2; | |
| 294 } | |
| 295 else | |
| 296 { | |
| 297 value = delta + (int8_t) temp[i]; | |
| 298 } | |
| 299 | |
| 300 output.push_back(value & 0xff); | |
| 301 output.push_back(value >> 8); | |
| 302 delta = value; | |
| 303 } | |
| 304 | |
| 305 if (output.size() % 2) | |
| 306 { | |
| 307 output.resize(output.size() - 1); | |
| 308 } | |
| 309 | |
| 310 return true; | |
| 311 } | |
| 312 | |
| 313 | |
| 845 | 314 void DicomImageDecoder::SetupImageBuffer(ImageBuffer& target, |
| 315 DcmDataset& dataset) | |
| 316 { | |
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317 DicomMap m; |
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318 FromDcmtkBridge::Convert(m, dataset); |
| 845 | 319 |
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320 DicomImageInformation info(m); |
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321 PixelFormat format; |
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322 |
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323 if (!info.ExtractPixelFormat(format)) |
| 845 | 324 { |
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325 LOG(WARNING) << "Unsupported DICOM image: " << info.GetBitsStored() |
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326 << "bpp, " << info.GetChannelCount() << " channels, " |
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327 << (info.IsSigned() ? "signed" : "unsigned"); |
| 845 | 328 throw OrthancException(ErrorCode_NotImplemented); |
| 329 } | |
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330 |
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331 target.SetHeight(info.GetHeight()); |
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332 target.SetWidth(info.GetWidth()); |
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333 target.SetFormat(format); |
| 845 | 334 } |
| 335 | |
| 336 | |
| 337 bool DicomImageDecoder::IsJpegLossless(const DcmDataset& dataset) | |
| 338 { | |
| 851 | 339 // http://support.dcmtk.org/docs/dcxfer_8h-source.html |
| 845 | 340 return (dataset.getOriginalXfer() == EXS_JPEGLSLossless || |
| 341 dataset.getOriginalXfer() == EXS_JPEGLSLossy); | |
| 342 } | |
| 343 | |
| 344 | |
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345 bool DicomImageDecoder::IsUncompressedImage(const DcmDataset& dataset) |
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346 { |
| 851 | 347 // http://support.dcmtk.org/docs/dcxfer_8h-source.html |
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348 return (dataset.getOriginalXfer() == EXS_Unknown || |
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349 dataset.getOriginalXfer() == EXS_LittleEndianImplicit || |
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350 dataset.getOriginalXfer() == EXS_BigEndianImplicit || |
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351 dataset.getOriginalXfer() == EXS_LittleEndianExplicit || |
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352 dataset.getOriginalXfer() == EXS_BigEndianExplicit); |
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353 } |
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354 |
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355 |
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356 template <typename PixelType> |
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357 static void CopyPixels(ImageAccessor& target, |
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358 const DicomIntegerPixelAccessor& source) |
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359 { |
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360 const PixelType minValue = std::numeric_limits<PixelType>::min(); |
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361 const PixelType maxValue = std::numeric_limits<PixelType>::max(); |
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362 |
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363 for (unsigned int y = 0; y < source.GetInformation().GetHeight(); y++) |
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364 { |
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365 PixelType* pixel = reinterpret_cast<PixelType*>(target.GetRow(y)); |
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366 for (unsigned int x = 0; x < source.GetInformation().GetWidth(); x++) |
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367 { |
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368 for (unsigned int c = 0; c < source.GetInformation().GetChannelCount(); c++, pixel++) |
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369 { |
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370 int32_t v = source.GetValue(x, y, c); |
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371 if (v < static_cast<int32_t>(minValue)) |
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372 { |
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373 *pixel = minValue; |
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374 } |
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375 else if (v > static_cast<int32_t>(maxValue)) |
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376 { |
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377 *pixel = maxValue; |
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378 } |
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379 else |
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380 { |
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381 *pixel = static_cast<PixelType>(v); |
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382 } |
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383 } |
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384 } |
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385 } |
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386 } |
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387 |
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388 |
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389 void DicomImageDecoder::DecodeUncompressedImage(ImageBuffer& target, |
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390 DcmDataset& dataset, |
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391 unsigned int frame) |
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392 { |
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393 if (!IsUncompressedImage(dataset)) |
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394 { |
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395 throw OrthancException(ErrorCode_BadParameterType); |
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396 } |
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397 |
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398 DecodeUncompressedImageInternal(target, dataset, frame); |
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399 } |
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400 |
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401 |
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402 void DicomImageDecoder::DecodeUncompressedImageInternal(ImageBuffer& target, |
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403 DcmDataset& dataset, |
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404 unsigned int frame) |
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405 { |
| 852 | 406 ImageSource source; |
| 407 source.Setup(dataset, frame); | |
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408 |
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409 /** |
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410 * Resize the target image, with some sanity checks. |
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411 **/ |
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412 |
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413 SetupImageBuffer(target, dataset); |
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414 |
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415 if (source.GetWidth() != target.GetWidth() || |
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416 source.GetHeight() != target.GetHeight()) |
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417 { |
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418 throw OrthancException(ErrorCode_InternalError); |
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419 } |
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420 |
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421 bool ok; |
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422 switch (target.GetFormat()) |
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423 { |
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424 case PixelFormat_RGB24: |
| 852 | 425 ok = source.GetChannelCount() == 3; |
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426 break; |
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427 |
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428 case PixelFormat_RGBA32: |
| 852 | 429 ok = source.GetChannelCount() == 4; |
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430 break; |
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431 |
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432 case PixelFormat_Grayscale8: |
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433 case PixelFormat_Grayscale16: |
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434 case PixelFormat_SignedGrayscale16: |
| 852 | 435 ok = source.GetChannelCount() == 1; |
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436 break; |
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437 |
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438 default: |
| 852 | 439 ok = false; |
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440 break; |
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441 } |
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442 |
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443 if (!ok) |
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444 { |
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445 throw OrthancException(ErrorCode_InternalError); |
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446 } |
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447 |
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448 |
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449 /** |
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450 * If the format of the DICOM buffer is natively supported, use a |
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451 * direct access to copy its values. |
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452 **/ |
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453 |
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454 ImageAccessor targetAccessor(target.GetAccessor()); |
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455 const DicomImageInformation& info = source.GetAccessor().GetInformation(); |
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456 |
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457 bool fastVersionSuccess = false; |
|
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458 PixelFormat sourceFormat; |
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459 if (info.ExtractPixelFormat(sourceFormat)) |
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460 { |
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461 try |
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462 { |
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463 ImageAccessor sourceImage; |
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464 sourceImage.AssignReadOnly(sourceFormat, |
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465 info.GetWidth(), |
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466 info.GetHeight(), |
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467 info.GetWidth() * info.GetBytesPerPixel(), |
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468 source.GetAccessor().GetPixelData()); |
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469 |
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470 ImageProcessing::Convert(targetAccessor, sourceImage); |
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471 ImageProcessing::ShiftRight(targetAccessor, info.GetShift()); |
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472 fastVersionSuccess = true; |
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473 } |
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474 catch (OrthancException&) |
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475 { |
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476 // Unsupported conversion |
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477 } |
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478 } |
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479 |
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480 |
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481 /** |
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482 * Loop over the DICOM buffer, storing its value into the target |
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483 * image. |
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484 **/ |
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485 |
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486 if (!fastVersionSuccess) |
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487 { |
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488 switch (target.GetFormat()) |
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489 { |
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490 case PixelFormat_RGB24: |
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491 case PixelFormat_RGBA32: |
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492 case PixelFormat_Grayscale8: |
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493 CopyPixels<uint8_t>(targetAccessor, source.GetAccessor()); |
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494 break; |
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495 |
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496 case PixelFormat_Grayscale16: |
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497 CopyPixels<uint16_t>(targetAccessor, source.GetAccessor()); |
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498 break; |
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499 |
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500 case PixelFormat_SignedGrayscale16: |
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501 CopyPixels<int16_t>(targetAccessor, source.GetAccessor()); |
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502 break; |
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503 |
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504 default: |
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505 throw OrthancException(ErrorCode_InternalError); |
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506 } |
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507 } |
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508 } |
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509 |
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510 |
| 845 | 511 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
| 512 void DicomImageDecoder::DecodeJpegLossless(ImageBuffer& target, | |
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513 DcmDataset& dataset, |
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514 unsigned int frame) |
| 845 | 515 { |
| 516 if (!IsJpegLossless(dataset)) | |
| 517 { | |
| 518 throw OrthancException(ErrorCode_BadParameterType); | |
| 519 } | |
| 520 | |
| 521 DcmElement *element = NULL; | |
| 522 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_PIXEL_DATA), element).good()) | |
| 523 { | |
| 524 throw OrthancException(ErrorCode_BadFileFormat); | |
| 525 } | |
| 526 | |
| 527 DcmPixelData& pixelData = dynamic_cast<DcmPixelData&>(*element); | |
| 528 DcmPixelSequence* pixelSequence = NULL; | |
| 529 if (!pixelData.getEncapsulatedRepresentation | |
| 530 (dataset.getOriginalXfer(), NULL, pixelSequence).good()) | |
| 531 { | |
| 532 throw OrthancException(ErrorCode_BadFileFormat); | |
| 533 } | |
| 534 | |
| 535 SetupImageBuffer(target, dataset); | |
| 536 | |
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537 ImageAccessor targetAccessor(target.GetAccessor()); |
| 845 | 538 |
| 539 /** | |
| 540 * The "DJLSLosslessDecoder" and "DJLSNearLosslessDecoder" in DCMTK | |
| 541 * are exactly the same, except for the "supportedTransferSyntax()" | |
| 542 * virtual function. | |
| 543 * http://support.dcmtk.org/docs/classDJLSDecoderBase.html | |
| 544 **/ | |
| 545 | |
| 546 DJLSLosslessDecoder decoder; DJLSCodecParameter parameters; | |
| 547 //DJLSNearLosslessDecoder decoder; DJLSCodecParameter parameters; | |
| 548 | |
| 549 Uint32 startFragment = 0; // Default | |
| 550 OFString decompressedColorModel; // Out | |
| 551 DJ_RPLossless representationParameter; | |
| 552 OFCondition c = decoder.decodeFrame(&representationParameter, pixelSequence, ¶meters, | |
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553 &dataset, frame, startFragment, targetAccessor.GetBuffer(), |
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554 targetAccessor.GetSize(), decompressedColorModel); |
| 845 | 555 |
| 556 if (!c.good()) | |
| 557 { | |
| 558 throw OrthancException(ErrorCode_InternalError); | |
| 559 } | |
| 560 } | |
| 561 #endif | |
| 846 | 562 |
| 563 | |
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564 |
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565 bool DicomImageDecoder::Decode(ImageBuffer& target, |
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566 DcmDataset& dataset, |
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567 unsigned int frame) |
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568 { |
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569 if (IsUncompressedImage(dataset)) |
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570 { |
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571 DecodeUncompressedImage(target, dataset, frame); |
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572 return true; |
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573 } |
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574 |
| 852 | 575 |
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576 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
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577 if (IsJpegLossless(dataset)) |
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578 { |
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579 LOG(INFO) << "Decoding a JPEG-LS image"; |
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580 DecodeJpegLossless(target, dataset, frame); |
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581 return true; |
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582 } |
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583 #endif |
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584 |
| 852 | 585 |
| 586 #if ORTHANC_JPEG_ENABLED == 1 | |
| 587 // TODO Implement this part to speed up JPEG decompression | |
| 588 #endif | |
| 589 | |
| 590 | |
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591 /** |
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592 * This DICOM image format is not natively supported by |
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593 * Orthanc. As a last resort, try and decode it through |
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594 * DCMTK. This will result in higher memory consumption. This is |
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595 * actually the second example of the following page: |
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596 * http://support.dcmtk.org/docs/mod_dcmjpeg.html#Examples |
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597 **/ |
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598 |
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599 { |
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600 LOG(INFO) << "Using DCMTK to decode a compressed image"; |
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601 |
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602 std::auto_ptr<DcmDataset> converted(dynamic_cast<DcmDataset*>(dataset.clone())); |
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603 converted->chooseRepresentation(EXS_LittleEndianExplicit, NULL); |
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604 |
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605 if (converted->canWriteXfer(EXS_LittleEndianExplicit)) |
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606 { |
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607 DecodeUncompressedImageInternal(target, *converted, frame); |
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608 return true; |
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609 } |
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610 } |
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611 |
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612 return false; |
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613 } |
| 845 | 614 } |