Mercurial > hg > orthanc
annotate OrthancServer/Internals/DicomImageDecoder.cpp @ 891:d0a08d8881b7 plugins
configuration
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Mon, 16 Jun 2014 15:40:58 +0200 |
| parents | e21d1a5f5934 |
| children | b3f6fb1130cd |
| rev | line source |
|---|---|
| 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 | |
| 863 | 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. | |
| 846 | 49 |
| 863 | 50 Redistribution and use in source and binary forms, with or without |
| 51 modification, are permitted provided that the following conditions are met: | |
| 846 | 52 |
| 863 | 53 * Redistributions of source code must retain the above copyright notice, |
| 54 this list of conditions and the following disclaimer. | |
| 846 | 55 |
| 863 | 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. | |
| 846 | 59 |
| 863 | 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. | |
| 846 | 64 |
| 863 | 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. | |
| 846 | 75 |
| 863 | 76 =========================================================================*/ |
| 846 | 77 |
| 78 | |
| 79 | |
|
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80 #include "../PrecompiledHeadersServer.h" |
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81 #include "DicomImageDecoder.h" |
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82 |
| 845 | 83 #include "../../Core/OrthancException.h" |
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84 #include "../../Core/ImageFormats/ImageProcessing.h" |
| 861 | 85 #include "../../Core/ImageFormats/PngWriter.h" // TODO REMOVE THIS |
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86 #include "../../Core/DicomFormat/DicomIntegerPixelAccessor.h" |
| 845 | 87 #include "../ToDcmtkBridge.h" |
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88 #include "../FromDcmtkBridge.h" |
| 845 | 89 |
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90 #include <glog/logging.h> |
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91 |
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92 #include <boost/lexical_cast.hpp> |
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93 |
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94 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
| 845 | 95 #include <dcmtk/dcmjpls/djcodecd.h> |
| 96 #include <dcmtk/dcmjpls/djcparam.h> | |
| 97 #include <dcmtk/dcmjpeg/djrplol.h> | |
| 98 #endif | |
| 99 | |
| 100 | |
| 101 namespace Orthanc | |
| 102 { | |
| 852 | 103 class DicomImageDecoder::ImageSource |
| 104 { | |
| 105 private: | |
| 106 std::string psmct_; | |
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107 std::auto_ptr<DicomIntegerPixelAccessor> slowAccessor_; |
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108 std::auto_ptr<ImageAccessor> fastAccessor_; |
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109 |
| 852 | 110 public: |
| 111 void Setup(DcmDataset& dataset, | |
| 112 unsigned int frame) | |
| 113 { | |
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114 psmct_.clear(); |
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115 slowAccessor_.reset(NULL); |
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116 fastAccessor_.reset(NULL); |
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117 |
| 852 | 118 // See also: http://support.dcmtk.org/wiki/dcmtk/howto/accessing-compressed-data |
| 119 | |
| 120 DicomMap m; | |
| 121 FromDcmtkBridge::Convert(m, dataset); | |
| 122 | |
| 123 /** | |
| 124 * Create an accessor to the raw values of the DICOM image. | |
| 125 **/ | |
| 126 | |
| 127 DcmElement* e; | |
| 128 if (dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_PIXEL_DATA), e).good() && | |
| 129 e != NULL) | |
| 130 { | |
| 131 Uint8* pixData = NULL; | |
| 132 if (e->getUint8Array(pixData) == EC_Normal) | |
| 133 { | |
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134 slowAccessor_.reset(new DicomIntegerPixelAccessor(m, pixData, e->getLength())); |
| 852 | 135 } |
| 136 } | |
| 137 else if (DicomImageDecoder::DecodePsmctRle1(psmct_, dataset)) | |
| 138 { | |
| 139 LOG(INFO) << "The PMSCT_RLE1 decoding has succeeded"; | |
| 140 Uint8* pixData = NULL; | |
| 141 if (psmct_.size() > 0) | |
| 142 { | |
| 143 pixData = reinterpret_cast<Uint8*>(&psmct_[0]); | |
| 144 } | |
| 145 | |
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146 slowAccessor_.reset(new DicomIntegerPixelAccessor(m, pixData, psmct_.size())); |
| 852 | 147 } |
| 148 | |
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149 if (slowAccessor_.get() == NULL) |
| 852 | 150 { |
| 151 throw OrthancException(ErrorCode_BadFileFormat); | |
| 152 } | |
| 153 | |
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154 slowAccessor_->SetCurrentFrame(frame); |
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155 |
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156 |
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157 /** |
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158 * If possible, create a fast ImageAccessor to the image buffer. |
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159 **/ |
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160 |
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161 |
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162 } |
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163 |
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164 unsigned int GetWidth() const |
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165 { |
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166 assert(slowAccessor_.get() != NULL); |
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167 return slowAccessor_->GetInformation().GetWidth(); |
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168 } |
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169 |
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170 unsigned int GetHeight() const |
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171 { |
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172 assert(slowAccessor_.get() != NULL); |
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173 return slowAccessor_->GetInformation().GetHeight(); |
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174 } |
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175 |
| 852 | 176 unsigned int GetChannelCount() const |
| 177 { | |
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178 assert(slowAccessor_.get() != NULL); |
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179 return slowAccessor_->GetInformation().GetChannelCount(); |
| 852 | 180 } |
| 181 | |
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182 const DicomIntegerPixelAccessor& GetAccessor() const |
| 852 | 183 { |
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184 assert(slowAccessor_.get() != NULL); |
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185 return *slowAccessor_; |
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186 } |
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187 |
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188 bool HasFastAccessor() const |
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189 { |
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190 return fastAccessor_.get() != NULL; |
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191 } |
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192 |
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193 const ImageAccessor& GetFastAccessor() const |
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194 { |
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195 assert(HasFastAccessor()); |
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196 return *fastAccessor_; |
| 852 | 197 } |
| 198 }; | |
| 199 | |
| 200 | |
| 846 | 201 static const DicomTag DICOM_TAG_CONTENT(0x07a1, 0x100a); |
| 202 static const DicomTag DICOM_TAG_COMPRESSION_TYPE(0x07a1, 0x1011); | |
| 203 | |
| 204 bool DicomImageDecoder::IsPsmctRle1(DcmDataset& dataset) | |
| 205 { | |
| 206 DcmElement* e; | |
| 207 char* c; | |
| 208 | |
| 209 // Check whether the DICOM instance contains an image encoded with | |
| 210 // the PMSCT_RLE1 scheme. | |
| 211 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_COMPRESSION_TYPE), e).good() || | |
| 212 e == NULL || | |
| 213 !e->isaString() || | |
| 214 !e->getString(c).good() || | |
| 215 c == NULL || | |
| 216 strcmp("PMSCT_RLE1", c)) | |
| 217 { | |
| 218 return false; | |
| 219 } | |
| 220 else | |
| 221 { | |
| 222 return true; | |
| 223 } | |
| 224 } | |
| 225 | |
| 226 | |
| 227 bool DicomImageDecoder::DecodePsmctRle1(std::string& output, | |
| 228 DcmDataset& dataset) | |
| 229 { | |
| 230 // Check whether the DICOM instance contains an image encoded with | |
| 231 // the PMSCT_RLE1 scheme. | |
| 232 if (!IsPsmctRle1(dataset)) | |
| 233 { | |
| 234 return false; | |
| 235 } | |
| 236 | |
| 237 // OK, this is a custom RLE encoding from Philips. Get the pixel | |
| 238 // data from the appropriate private DICOM tag. | |
| 239 Uint8* pixData = NULL; | |
| 240 DcmElement* e; | |
| 241 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_CONTENT), e).good() || | |
| 242 e == NULL || | |
| 243 e->getUint8Array(pixData) != EC_Normal) | |
| 244 { | |
| 245 return false; | |
| 246 } | |
| 247 | |
| 248 // The "unsigned" below IS VERY IMPORTANT | |
| 249 const uint8_t* inbuffer = reinterpret_cast<const uint8_t*>(pixData); | |
| 250 const size_t length = e->getLength(); | |
| 251 | |
| 252 /** | |
| 253 * The code below is an adaptation of a sample code for GDCM by | |
| 254 * Mathieu Malaterre (under a BSD license). | |
| 255 * http://gdcm.sourceforge.net/html/rle2img_8cxx-example.html | |
| 256 **/ | |
| 257 | |
| 258 // RLE pass | |
| 259 std::vector<uint8_t> temp; | |
| 260 temp.reserve(length); | |
| 261 for (size_t i = 0; i < length; i++) | |
| 262 { | |
| 263 if (inbuffer[i] == 0xa5) | |
| 264 { | |
| 265 temp.push_back(inbuffer[i+2]); | |
| 266 for (uint8_t repeat = inbuffer[i + 1]; repeat != 0; repeat--) | |
| 267 { | |
| 268 temp.push_back(inbuffer[i+2]); | |
| 269 } | |
| 270 i += 2; | |
| 271 } | |
| 272 else | |
| 273 { | |
| 274 temp.push_back(inbuffer[i]); | |
| 275 } | |
| 276 } | |
| 277 | |
| 278 // Delta encoding pass | |
| 279 uint16_t delta = 0; | |
| 280 output.clear(); | |
| 281 output.reserve(temp.size()); | |
| 282 for (size_t i = 0; i < temp.size(); i++) | |
| 283 { | |
| 284 uint16_t value; | |
| 285 | |
| 286 if (temp[i] == 0x5a) | |
| 287 { | |
| 288 uint16_t v1 = temp[i + 1]; | |
| 289 uint16_t v2 = temp[i + 2]; | |
| 290 value = (v2 << 8) + v1; | |
| 291 i += 2; | |
| 292 } | |
| 293 else | |
| 294 { | |
| 295 value = delta + (int8_t) temp[i]; | |
| 296 } | |
| 297 | |
| 298 output.push_back(value & 0xff); | |
| 299 output.push_back(value >> 8); | |
| 300 delta = value; | |
| 301 } | |
| 302 | |
| 303 if (output.size() % 2) | |
| 304 { | |
| 305 output.resize(output.size() - 1); | |
| 306 } | |
| 307 | |
| 308 return true; | |
| 309 } | |
| 310 | |
| 311 | |
| 845 | 312 void DicomImageDecoder::SetupImageBuffer(ImageBuffer& target, |
| 313 DcmDataset& dataset) | |
| 314 { | |
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315 DicomMap m; |
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316 FromDcmtkBridge::Convert(m, dataset); |
| 845 | 317 |
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318 DicomImageInformation info(m); |
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319 PixelFormat format; |
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320 |
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321 if (!info.ExtractPixelFormat(format)) |
| 845 | 322 { |
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323 LOG(WARNING) << "Unsupported DICOM image: " << info.GetBitsStored() |
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324 << "bpp, " << info.GetChannelCount() << " channels, " |
| 860 | 325 << (info.IsSigned() ? "signed" : "unsigned") |
| 326 << (info.IsPlanar() ? ", planar" : ", non-planar"); | |
| 845 | 327 throw OrthancException(ErrorCode_NotImplemented); |
| 328 } | |
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329 |
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330 target.SetHeight(info.GetHeight()); |
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331 target.SetWidth(info.GetWidth()); |
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332 target.SetFormat(format); |
| 845 | 333 } |
| 334 | |
| 335 | |
| 336 bool DicomImageDecoder::IsJpegLossless(const DcmDataset& dataset) | |
| 337 { | |
| 851 | 338 // http://support.dcmtk.org/docs/dcxfer_8h-source.html |
| 845 | 339 return (dataset.getOriginalXfer() == EXS_JPEGLSLossless || |
| 340 dataset.getOriginalXfer() == EXS_JPEGLSLossy); | |
| 341 } | |
| 342 | |
| 343 | |
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344 bool DicomImageDecoder::IsUncompressedImage(const DcmDataset& dataset) |
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345 { |
| 851 | 346 // http://support.dcmtk.org/docs/dcxfer_8h-source.html |
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347 return (dataset.getOriginalXfer() == EXS_Unknown || |
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348 dataset.getOriginalXfer() == EXS_LittleEndianImplicit || |
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349 dataset.getOriginalXfer() == EXS_BigEndianImplicit || |
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350 dataset.getOriginalXfer() == EXS_LittleEndianExplicit || |
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351 dataset.getOriginalXfer() == EXS_BigEndianExplicit); |
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352 } |
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353 |
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354 |
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355 template <typename PixelType> |
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356 static void CopyPixels(ImageAccessor& target, |
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357 const DicomIntegerPixelAccessor& source) |
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358 { |
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359 const PixelType minValue = std::numeric_limits<PixelType>::min(); |
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360 const PixelType maxValue = std::numeric_limits<PixelType>::max(); |
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361 |
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362 for (unsigned int y = 0; y < source.GetInformation().GetHeight(); y++) |
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363 { |
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364 PixelType* pixel = reinterpret_cast<PixelType*>(target.GetRow(y)); |
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365 for (unsigned int x = 0; x < source.GetInformation().GetWidth(); x++) |
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366 { |
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367 for (unsigned int c = 0; c < source.GetInformation().GetChannelCount(); c++, pixel++) |
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368 { |
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369 int32_t v = source.GetValue(x, y, c); |
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370 if (v < static_cast<int32_t>(minValue)) |
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371 { |
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372 *pixel = minValue; |
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373 } |
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374 else if (v > static_cast<int32_t>(maxValue)) |
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375 { |
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376 *pixel = maxValue; |
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377 } |
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378 else |
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379 { |
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380 *pixel = static_cast<PixelType>(v); |
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381 } |
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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 void DicomImageDecoder::DecodeUncompressedImage(ImageBuffer& target, |
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389 DcmDataset& dataset, |
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390 unsigned int frame) |
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391 { |
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392 if (!IsUncompressedImage(dataset)) |
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393 { |
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394 throw OrthancException(ErrorCode_BadParameterType); |
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395 } |
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396 |
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397 DecodeUncompressedImageInternal(target, dataset, frame); |
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398 } |
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399 |
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400 |
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401 void DicomImageDecoder::DecodeUncompressedImageInternal(ImageBuffer& target, |
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402 DcmDataset& dataset, |
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403 unsigned int frame) |
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404 { |
| 852 | 405 ImageSource source; |
| 406 source.Setup(dataset, frame); | |
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407 |
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408 |
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409 /** |
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410 * Resize the target image. |
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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 |
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422 /** |
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423 * If the format of the DICOM buffer is natively supported, use a |
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424 * direct access to copy its values. |
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425 **/ |
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426 |
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427 ImageAccessor targetAccessor(target.GetAccessor()); |
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428 const DicomImageInformation& info = source.GetAccessor().GetInformation(); |
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429 |
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430 bool fastVersionSuccess = false; |
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431 PixelFormat sourceFormat; |
| 863 | 432 if (!info.IsPlanar() && |
| 433 info.ExtractPixelFormat(sourceFormat)) | |
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434 { |
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435 try |
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436 { |
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437 ImageAccessor sourceImage; |
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438 sourceImage.AssignReadOnly(sourceFormat, |
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439 info.GetWidth(), |
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440 info.GetHeight(), |
| 860 | 441 info.GetWidth() * GetBytesPerPixel(sourceFormat), |
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442 source.GetAccessor().GetPixelData()); |
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443 |
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444 ImageProcessing::Convert(targetAccessor, sourceImage); |
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445 ImageProcessing::ShiftRight(targetAccessor, info.GetShift()); |
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446 fastVersionSuccess = true; |
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447 } |
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448 catch (OrthancException&) |
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449 { |
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450 // Unsupported conversion, use the slow version |
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451 } |
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452 } |
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453 |
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454 |
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455 /** |
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456 * Slow version : loop over the DICOM buffer, storing its value |
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457 * into the target image. |
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458 **/ |
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fully functional JPEG-LS conversion
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459 |
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460 if (!fastVersionSuccess) |
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461 { |
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462 switch (target.GetFormat()) |
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463 { |
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464 case PixelFormat_RGB24: |
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465 case PixelFormat_RGBA32: |
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466 case PixelFormat_Grayscale8: |
| 863 | 467 CopyPixels<uint8_t>(targetAccessor, source.GetAccessor()); |
| 468 break; | |
| 860 | 469 |
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470 case PixelFormat_Grayscale16: |
| 863 | 471 CopyPixels<uint16_t>(targetAccessor, source.GetAccessor()); |
| 472 break; | |
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fully functional JPEG-LS conversion
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473 |
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474 case PixelFormat_SignedGrayscale16: |
| 863 | 475 CopyPixels<int16_t>(targetAccessor, source.GetAccessor()); |
| 476 break; | |
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477 |
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478 default: |
| 863 | 479 throw OrthancException(ErrorCode_InternalError); |
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480 } |
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481 } |
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482 } |
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fully functional JPEG-LS conversion
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483 |
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fully functional JPEG-LS conversion
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484 |
| 845 | 485 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
| 486 void DicomImageDecoder::DecodeJpegLossless(ImageBuffer& target, | |
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487 DcmDataset& dataset, |
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488 unsigned int frame) |
| 845 | 489 { |
| 490 if (!IsJpegLossless(dataset)) | |
| 491 { | |
| 492 throw OrthancException(ErrorCode_BadParameterType); | |
| 493 } | |
| 494 | |
| 495 DcmElement *element = NULL; | |
| 496 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_PIXEL_DATA), element).good()) | |
| 497 { | |
| 498 throw OrthancException(ErrorCode_BadFileFormat); | |
| 499 } | |
| 500 | |
| 501 DcmPixelData& pixelData = dynamic_cast<DcmPixelData&>(*element); | |
| 502 DcmPixelSequence* pixelSequence = NULL; | |
| 503 if (!pixelData.getEncapsulatedRepresentation | |
| 504 (dataset.getOriginalXfer(), NULL, pixelSequence).good()) | |
| 505 { | |
| 506 throw OrthancException(ErrorCode_BadFileFormat); | |
| 507 } | |
| 508 | |
| 509 SetupImageBuffer(target, dataset); | |
| 510 | |
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511 ImageAccessor targetAccessor(target.GetAccessor()); |
| 845 | 512 |
| 513 /** | |
| 514 * The "DJLSLosslessDecoder" and "DJLSNearLosslessDecoder" in DCMTK | |
| 515 * are exactly the same, except for the "supportedTransferSyntax()" | |
| 516 * virtual function. | |
| 517 * http://support.dcmtk.org/docs/classDJLSDecoderBase.html | |
| 518 **/ | |
| 519 | |
| 520 DJLSLosslessDecoder decoder; DJLSCodecParameter parameters; | |
| 521 //DJLSNearLosslessDecoder decoder; DJLSCodecParameter parameters; | |
| 522 | |
| 523 Uint32 startFragment = 0; // Default | |
| 524 OFString decompressedColorModel; // Out | |
| 525 DJ_RPLossless representationParameter; | |
| 526 OFCondition c = decoder.decodeFrame(&representationParameter, pixelSequence, ¶meters, | |
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527 &dataset, frame, startFragment, targetAccessor.GetBuffer(), |
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528 targetAccessor.GetSize(), decompressedColorModel); |
| 845 | 529 |
| 530 if (!c.good()) | |
| 531 { | |
| 532 throw OrthancException(ErrorCode_InternalError); | |
| 533 } | |
| 534 } | |
| 535 #endif | |
| 846 | 536 |
| 537 | |
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538 |
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539 |
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540 bool DicomImageDecoder::Decode(ImageBuffer& target, |
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541 DcmDataset& dataset, |
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542 unsigned int frame) |
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543 { |
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544 if (IsUncompressedImage(dataset)) |
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545 { |
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546 DecodeUncompressedImage(target, dataset, frame); |
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547 return true; |
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548 } |
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549 |
| 852 | 550 |
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551 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
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552 if (IsJpegLossless(dataset)) |
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553 { |
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554 LOG(INFO) << "Decoding a JPEG-LS image"; |
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fully functional JPEG-LS conversion
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555 DecodeJpegLossless(target, dataset, frame); |
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556 return true; |
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557 } |
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558 #endif |
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559 |
| 852 | 560 |
| 561 #if ORTHANC_JPEG_ENABLED == 1 | |
| 562 // TODO Implement this part to speed up JPEG decompression | |
| 563 #endif | |
| 564 | |
| 565 | |
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fully functional JPEG-LS conversion
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566 /** |
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567 * This DICOM image format is not natively supported by |
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568 * Orthanc. As a last resort, try and decode it through |
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569 * DCMTK. This will result in higher memory consumption. This is |
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fully functional JPEG-LS conversion
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570 * actually the second example of the following page: |
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fully functional JPEG-LS conversion
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571 * http://support.dcmtk.org/docs/mod_dcmjpeg.html#Examples |
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fully functional JPEG-LS conversion
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572 **/ |
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fully functional JPEG-LS conversion
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573 |
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fully functional JPEG-LS conversion
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574 { |
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575 LOG(INFO) << "Using DCMTK to decode a compressed image"; |
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fully functional JPEG-LS conversion
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576 |
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577 std::auto_ptr<DcmDataset> converted(dynamic_cast<DcmDataset*>(dataset.clone())); |
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578 converted->chooseRepresentation(EXS_LittleEndianExplicit, NULL); |
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579 |
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fully functional JPEG-LS conversion
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580 if (converted->canWriteXfer(EXS_LittleEndianExplicit)) |
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fully functional JPEG-LS conversion
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581 { |
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fully functional JPEG-LS conversion
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582 DecodeUncompressedImageInternal(target, *converted, frame); |
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fully functional JPEG-LS conversion
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583 return true; |
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fully functional JPEG-LS conversion
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parents:
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584 } |
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fully functional JPEG-LS conversion
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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585 } |
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fully functional JPEG-LS conversion
Sebastien Jodogne <s.jodogne@gmail.com>
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586 |
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fully functional JPEG-LS conversion
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587 return false; |
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fully functional JPEG-LS conversion
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|
588 } |
|
859
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ImageProcessing::Convert
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|
589 |
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ImageProcessing::Convert
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590 |
| 863 | 591 bool DicomImageDecoder::DecodeAndTruncate(ImageBuffer& target, |
| 592 DcmDataset& dataset, | |
| 593 unsigned int frame, | |
| 594 PixelFormat format) | |
|
859
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595 { |
| 863 | 596 // TODO Special case for uncompressed images |
| 597 | |
| 598 ImageBuffer source; | |
| 599 if (!Decode(source, dataset, frame)) | |
| 600 { | |
| 601 return false; | |
| 602 } | |
| 603 | |
| 604 if (source.GetFormat() == format) | |
| 605 { | |
| 606 // No conversion is required, return the temporary image | |
| 607 target.AcquireOwnership(source); | |
| 608 return true; | |
| 609 } | |
|
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610 |
| 863 | 611 target.SetFormat(format); |
| 612 target.SetWidth(source.GetWidth()); | |
| 613 target.SetHeight(source.GetHeight()); | |
| 614 | |
| 615 ImageAccessor targetAccessor(target.GetAccessor()); | |
| 616 ImageAccessor sourceAccessor(source.GetAccessor()); | |
| 617 ImageProcessing::Convert(targetAccessor, sourceAccessor); | |
| 618 | |
| 619 return true; | |
| 620 } | |
| 621 | |
| 622 | |
| 623 bool DicomImageDecoder::DecodePreview(ImageBuffer& target, | |
| 624 DcmDataset& dataset, | |
| 625 unsigned int frame) | |
| 626 { | |
| 627 // TODO Special case for uncompressed images | |
| 628 | |
| 629 ImageBuffer source; | |
| 630 if (!Decode(source, dataset, frame)) | |
|
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631 { |
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632 return false; |
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633 } |
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634 |
| 863 | 635 switch (source.GetFormat()) |
| 861 | 636 { |
| 863 | 637 case PixelFormat_RGB24: |
|
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638 { |
| 863 | 639 // Directly return color images (RGB) |
| 640 target.AcquireOwnership(source); | |
|
859
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641 return true; |
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642 } |
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643 |
| 863 | 644 case PixelFormat_Grayscale8: |
| 645 case PixelFormat_Grayscale16: | |
| 646 case PixelFormat_SignedGrayscale16: | |
| 647 { | |
| 648 // Grayscale image: Stretch its dynamics to the [0,255] range | |
| 649 target.SetFormat(PixelFormat_Grayscale8); | |
| 650 target.SetWidth(source.GetWidth()); | |
| 651 target.SetHeight(source.GetHeight()); | |
| 652 | |
| 653 ImageAccessor targetAccessor(target.GetAccessor()); | |
| 654 ImageAccessor sourceAccessor(source.GetAccessor()); | |
| 655 | |
| 656 int64_t a, b; | |
| 657 ImageProcessing::GetMinMaxValue(a, b, sourceAccessor); | |
| 658 | |
| 659 if (a == b) | |
| 660 { | |
| 661 ImageProcessing::Set(targetAccessor, 0); | |
| 662 } | |
| 663 else | |
| 664 { | |
| 876 | 665 ImageProcessing::ShiftScale(sourceAccessor, static_cast<float>(-a), 255.0f / static_cast<float>(b - a)); |
| 863 | 666 |
| 667 if (source.GetFormat() == PixelFormat_Grayscale8) | |
| 668 { | |
| 669 target.AcquireOwnership(source); | |
| 670 } | |
| 671 else | |
| 672 { | |
| 673 ImageProcessing::Convert(targetAccessor, sourceAccessor); | |
| 674 } | |
| 675 } | |
| 676 | |
| 677 return true; | |
| 678 } | |
| 679 | |
|
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680 default: |
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681 throw OrthancException(ErrorCode_NotImplemented); |
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682 } |
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683 } |
| 845 | 684 } |