Mercurial > hg > orthanc
annotate OrthancServer/Internals/DicomImageDecoder.cpp @ 1824:b530c3dfe2a6
refactoring image decoding
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Wed, 25 Nov 2015 14:14:32 +0100 |
| parents | 96582230ddcb |
| children | ac5b0b4e2434 |
| rev | line source |
|---|---|
| 845 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics |
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4 * Department, University Hospital of Liege, Belgium |
| 845 | 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 |
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83 #include "../../Core/Logging.h" |
| 845 | 84 #include "../../Core/OrthancException.h" |
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85 #include "../../Core/Images/ImageProcessing.h" |
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86 #include "../../Core/Images/PngWriter.h" // TODO REMOVE THIS |
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87 #include "../../Core/DicomFormat/DicomIntegerPixelAccessor.h" |
| 845 | 88 #include "../ToDcmtkBridge.h" |
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89 #include "../FromDcmtkBridge.h" |
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90 #include "../ParsedDicomFile.h" |
| 845 | 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 { | |
| 846 | 103 static const DicomTag DICOM_TAG_CONTENT(0x07a1, 0x100a); |
| 104 static const DicomTag DICOM_TAG_COMPRESSION_TYPE(0x07a1, 0x1011); | |
| 105 | |
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106 |
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107 static bool IsJpegLossless(const DcmDataset& dataset) |
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108 { |
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109 // http://support.dcmtk.org/docs/dcxfer_8h-source.html |
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110 return (dataset.getOriginalXfer() == EXS_JPEGLSLossless || |
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111 dataset.getOriginalXfer() == EXS_JPEGLSLossy); |
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112 } |
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113 |
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114 |
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115 static bool IsPsmctRle1(DcmDataset& dataset) |
| 846 | 116 { |
| 117 DcmElement* e; | |
| 118 char* c; | |
| 119 | |
| 120 // Check whether the DICOM instance contains an image encoded with | |
| 121 // the PMSCT_RLE1 scheme. | |
| 122 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_COMPRESSION_TYPE), e).good() || | |
| 123 e == NULL || | |
| 124 !e->isaString() || | |
| 125 !e->getString(c).good() || | |
| 126 c == NULL || | |
| 127 strcmp("PMSCT_RLE1", c)) | |
| 128 { | |
| 129 return false; | |
| 130 } | |
| 131 else | |
| 132 { | |
| 133 return true; | |
| 134 } | |
| 135 } | |
| 136 | |
| 137 | |
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138 static bool DecodePsmctRle1(std::string& output, |
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139 DcmDataset& dataset) |
| 846 | 140 { |
| 141 // Check whether the DICOM instance contains an image encoded with | |
| 142 // the PMSCT_RLE1 scheme. | |
| 143 if (!IsPsmctRle1(dataset)) | |
| 144 { | |
| 145 return false; | |
| 146 } | |
| 147 | |
| 148 // OK, this is a custom RLE encoding from Philips. Get the pixel | |
| 149 // data from the appropriate private DICOM tag. | |
| 150 Uint8* pixData = NULL; | |
| 151 DcmElement* e; | |
| 152 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_CONTENT), e).good() || | |
| 153 e == NULL || | |
| 154 e->getUint8Array(pixData) != EC_Normal) | |
| 155 { | |
| 156 return false; | |
| 157 } | |
| 158 | |
| 159 // The "unsigned" below IS VERY IMPORTANT | |
| 160 const uint8_t* inbuffer = reinterpret_cast<const uint8_t*>(pixData); | |
| 161 const size_t length = e->getLength(); | |
| 162 | |
| 163 /** | |
| 164 * The code below is an adaptation of a sample code for GDCM by | |
| 165 * Mathieu Malaterre (under a BSD license). | |
| 166 * http://gdcm.sourceforge.net/html/rle2img_8cxx-example.html | |
| 167 **/ | |
| 168 | |
| 169 // RLE pass | |
| 170 std::vector<uint8_t> temp; | |
| 171 temp.reserve(length); | |
| 172 for (size_t i = 0; i < length; i++) | |
| 173 { | |
| 174 if (inbuffer[i] == 0xa5) | |
| 175 { | |
| 176 temp.push_back(inbuffer[i+2]); | |
| 177 for (uint8_t repeat = inbuffer[i + 1]; repeat != 0; repeat--) | |
| 178 { | |
| 179 temp.push_back(inbuffer[i+2]); | |
| 180 } | |
| 181 i += 2; | |
| 182 } | |
| 183 else | |
| 184 { | |
| 185 temp.push_back(inbuffer[i]); | |
| 186 } | |
| 187 } | |
| 188 | |
| 189 // Delta encoding pass | |
| 190 uint16_t delta = 0; | |
| 191 output.clear(); | |
| 192 output.reserve(temp.size()); | |
| 193 for (size_t i = 0; i < temp.size(); i++) | |
| 194 { | |
| 195 uint16_t value; | |
| 196 | |
| 197 if (temp[i] == 0x5a) | |
| 198 { | |
| 199 uint16_t v1 = temp[i + 1]; | |
| 200 uint16_t v2 = temp[i + 2]; | |
| 201 value = (v2 << 8) + v1; | |
| 202 i += 2; | |
| 203 } | |
| 204 else | |
| 205 { | |
| 206 value = delta + (int8_t) temp[i]; | |
| 207 } | |
| 208 | |
| 209 output.push_back(value & 0xff); | |
| 210 output.push_back(value >> 8); | |
| 211 delta = value; | |
| 212 } | |
| 213 | |
| 214 if (output.size() % 2) | |
| 215 { | |
| 216 output.resize(output.size() - 1); | |
| 217 } | |
| 218 | |
| 219 return true; | |
| 220 } | |
| 221 | |
| 222 | |
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223 class DicomImageDecoder::ImageSource |
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224 { |
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225 private: |
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226 std::string psmct_; |
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227 std::auto_ptr<DicomIntegerPixelAccessor> slowAccessor_; |
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228 |
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229 public: |
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230 void Setup(DcmDataset& dataset, |
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231 unsigned int frame) |
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232 { |
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233 psmct_.clear(); |
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234 slowAccessor_.reset(NULL); |
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235 |
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236 // See also: http://support.dcmtk.org/wiki/dcmtk/howto/accessing-compressed-data |
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237 |
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238 DicomMap m; |
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239 FromDcmtkBridge::Convert(m, dataset); |
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240 |
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241 /** |
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242 * Create an accessor to the raw values of the DICOM image. |
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243 **/ |
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244 |
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245 DcmElement* e; |
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246 if (dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_PIXEL_DATA), e).good() && |
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247 e != NULL) |
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248 { |
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249 Uint8* pixData = NULL; |
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250 if (e->getUint8Array(pixData) == EC_Normal) |
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251 { |
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252 slowAccessor_.reset(new DicomIntegerPixelAccessor(m, pixData, e->getLength())); |
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253 } |
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254 } |
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255 else if (DecodePsmctRle1(psmct_, dataset)) |
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256 { |
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257 LOG(INFO) << "The PMSCT_RLE1 decoding has succeeded"; |
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258 Uint8* pixData = NULL; |
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259 if (psmct_.size() > 0) |
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260 { |
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261 pixData = reinterpret_cast<Uint8*>(&psmct_[0]); |
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262 } |
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263 |
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264 slowAccessor_.reset(new DicomIntegerPixelAccessor(m, pixData, psmct_.size())); |
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265 } |
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266 |
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267 if (slowAccessor_.get() == NULL) |
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268 { |
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269 throw OrthancException(ErrorCode_BadFileFormat); |
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270 } |
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271 |
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272 slowAccessor_->SetCurrentFrame(frame); |
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273 } |
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274 |
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275 unsigned int GetWidth() const |
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276 { |
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277 assert(slowAccessor_.get() != NULL); |
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278 return slowAccessor_->GetInformation().GetWidth(); |
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279 } |
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280 |
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281 unsigned int GetHeight() const |
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282 { |
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283 assert(slowAccessor_.get() != NULL); |
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284 return slowAccessor_->GetInformation().GetHeight(); |
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285 } |
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286 |
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287 unsigned int GetChannelCount() const |
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288 { |
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289 assert(slowAccessor_.get() != NULL); |
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290 return slowAccessor_->GetInformation().GetChannelCount(); |
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291 } |
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292 |
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293 const DicomIntegerPixelAccessor& GetAccessor() const |
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294 { |
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295 assert(slowAccessor_.get() != NULL); |
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296 return *slowAccessor_; |
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297 } |
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298 |
| 1190 | 299 unsigned int GetSize() const |
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300 { |
| 1190 | 301 assert(slowAccessor_.get() != NULL); |
| 302 return slowAccessor_->GetSize(); | |
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303 } |
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304 }; |
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305 |
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306 |
| 845 | 307 void DicomImageDecoder::SetupImageBuffer(ImageBuffer& target, |
| 308 DcmDataset& dataset) | |
| 309 { | |
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310 DicomMap m; |
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311 FromDcmtkBridge::Convert(m, dataset); |
| 845 | 312 |
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313 DicomImageInformation info(m); |
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314 PixelFormat format; |
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315 |
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316 if (!info.ExtractPixelFormat(format)) |
| 845 | 317 { |
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318 LOG(WARNING) << "Unsupported DICOM image: " << info.GetBitsStored() |
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319 << "bpp, " << info.GetChannelCount() << " channels, " |
| 860 | 320 << (info.IsSigned() ? "signed" : "unsigned") |
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321 << (info.IsPlanar() ? ", planar, " : ", non-planar, ") |
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322 << EnumerationToString(info.GetPhotometricInterpretation()) |
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323 << " photometric interpretation"; |
| 845 | 324 throw OrthancException(ErrorCode_NotImplemented); |
| 325 } | |
|
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326 |
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327 target.SetHeight(info.GetHeight()); |
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328 target.SetWidth(info.GetWidth()); |
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329 target.SetFormat(format); |
| 845 | 330 } |
| 331 | |
| 332 | |
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333 bool DicomImageDecoder::IsUncompressedImage(const DcmDataset& dataset) |
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334 { |
| 851 | 335 // http://support.dcmtk.org/docs/dcxfer_8h-source.html |
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336 return (dataset.getOriginalXfer() == EXS_Unknown || |
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337 dataset.getOriginalXfer() == EXS_LittleEndianImplicit || |
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338 dataset.getOriginalXfer() == EXS_BigEndianImplicit || |
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339 dataset.getOriginalXfer() == EXS_LittleEndianExplicit || |
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340 dataset.getOriginalXfer() == EXS_BigEndianExplicit); |
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341 } |
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342 |
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343 |
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344 template <typename PixelType> |
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345 static void CopyPixels(ImageAccessor& target, |
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346 const DicomIntegerPixelAccessor& source) |
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347 { |
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348 const PixelType minValue = std::numeric_limits<PixelType>::min(); |
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349 const PixelType maxValue = std::numeric_limits<PixelType>::max(); |
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350 |
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351 for (unsigned int y = 0; y < source.GetInformation().GetHeight(); y++) |
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352 { |
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353 PixelType* pixel = reinterpret_cast<PixelType*>(target.GetRow(y)); |
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354 for (unsigned int x = 0; x < source.GetInformation().GetWidth(); x++) |
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355 { |
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356 for (unsigned int c = 0; c < source.GetInformation().GetChannelCount(); c++, pixel++) |
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357 { |
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358 int32_t v = source.GetValue(x, y, c); |
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359 if (v < static_cast<int32_t>(minValue)) |
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360 { |
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361 *pixel = minValue; |
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362 } |
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363 else if (v > static_cast<int32_t>(maxValue)) |
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364 { |
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365 *pixel = maxValue; |
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366 } |
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367 else |
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368 { |
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369 *pixel = static_cast<PixelType>(v); |
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370 } |
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371 } |
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372 } |
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373 } |
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374 } |
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375 |
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376 |
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377 void DicomImageDecoder::DecodeUncompressedImage(ImageBuffer& target, |
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378 DcmDataset& dataset, |
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379 unsigned int frame) |
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380 { |
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381 if (!IsUncompressedImage(dataset)) |
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382 { |
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383 throw OrthancException(ErrorCode_BadParameterType); |
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384 } |
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385 |
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386 DecodeUncompressedImageInternal(target, dataset, frame); |
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387 } |
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388 |
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389 |
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390 void DicomImageDecoder::DecodeUncompressedImageInternal(ImageBuffer& target, |
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391 DcmDataset& dataset, |
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392 unsigned int frame) |
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393 { |
| 852 | 394 ImageSource source; |
| 395 source.Setup(dataset, frame); | |
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396 |
|
858
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397 |
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398 /** |
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399 * Resize the target image. |
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400 **/ |
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401 |
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402 SetupImageBuffer(target, dataset); |
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403 |
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404 if (source.GetWidth() != target.GetWidth() || |
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405 source.GetHeight() != target.GetHeight()) |
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406 { |
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407 throw OrthancException(ErrorCode_InternalError); |
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408 } |
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409 |
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410 |
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411 /** |
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412 * If the format of the DICOM buffer is natively supported, use a |
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413 * direct access to copy its values. |
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414 **/ |
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415 |
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416 ImageAccessor targetAccessor(target.GetAccessor()); |
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417 const DicomImageInformation& info = source.GetAccessor().GetInformation(); |
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418 |
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419 bool fastVersionSuccess = false; |
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420 PixelFormat sourceFormat; |
| 863 | 421 if (!info.IsPlanar() && |
| 422 info.ExtractPixelFormat(sourceFormat)) | |
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423 { |
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424 try |
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425 { |
| 1190 | 426 size_t frameSize = info.GetHeight() * info.GetWidth() * GetBytesPerPixel(sourceFormat); |
| 427 if ((frame + 1) * frameSize <= source.GetSize()) | |
| 428 { | |
| 429 const uint8_t* buffer = reinterpret_cast<const uint8_t*>(source.GetAccessor().GetPixelData()); | |
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430 |
| 1190 | 431 ImageAccessor sourceImage; |
| 432 sourceImage.AssignReadOnly(sourceFormat, | |
| 433 info.GetWidth(), | |
| 434 info.GetHeight(), | |
| 435 info.GetWidth() * GetBytesPerPixel(sourceFormat), | |
| 436 buffer + frame * frameSize); | |
| 437 | |
| 438 ImageProcessing::Convert(targetAccessor, sourceImage); | |
| 439 ImageProcessing::ShiftRight(targetAccessor, info.GetShift()); | |
| 440 fastVersionSuccess = true; | |
| 441 } | |
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442 } |
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443 catch (OrthancException&) |
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444 { |
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445 // Unsupported conversion, use the slow version |
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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 * Slow version : loop over the DICOM buffer, storing its value |
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451 * into the target image. |
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452 **/ |
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453 |
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454 if (!fastVersionSuccess) |
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455 { |
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456 switch (target.GetFormat()) |
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457 { |
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458 case PixelFormat_RGB24: |
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459 case PixelFormat_RGBA32: |
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460 case PixelFormat_Grayscale8: |
| 863 | 461 CopyPixels<uint8_t>(targetAccessor, source.GetAccessor()); |
| 462 break; | |
| 860 | 463 |
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464 case PixelFormat_Grayscale16: |
| 863 | 465 CopyPixels<uint16_t>(targetAccessor, source.GetAccessor()); |
| 466 break; | |
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467 |
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468 case PixelFormat_SignedGrayscale16: |
| 863 | 469 CopyPixels<int16_t>(targetAccessor, source.GetAccessor()); |
| 470 break; | |
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471 |
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472 default: |
| 863 | 473 throw OrthancException(ErrorCode_InternalError); |
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474 } |
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475 } |
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476 } |
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477 |
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478 |
| 845 | 479 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
| 480 void DicomImageDecoder::DecodeJpegLossless(ImageBuffer& target, | |
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481 DcmDataset& dataset, |
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482 unsigned int frame) |
| 845 | 483 { |
| 484 if (!IsJpegLossless(dataset)) | |
| 485 { | |
| 486 throw OrthancException(ErrorCode_BadParameterType); | |
| 487 } | |
| 488 | |
| 489 DcmElement *element = NULL; | |
| 490 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_PIXEL_DATA), element).good()) | |
| 491 { | |
| 492 throw OrthancException(ErrorCode_BadFileFormat); | |
| 493 } | |
| 494 | |
| 495 DcmPixelData& pixelData = dynamic_cast<DcmPixelData&>(*element); | |
| 496 DcmPixelSequence* pixelSequence = NULL; | |
| 497 if (!pixelData.getEncapsulatedRepresentation | |
| 498 (dataset.getOriginalXfer(), NULL, pixelSequence).good()) | |
| 499 { | |
| 500 throw OrthancException(ErrorCode_BadFileFormat); | |
| 501 } | |
| 502 | |
| 503 SetupImageBuffer(target, dataset); | |
| 504 | |
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505 ImageAccessor targetAccessor(target.GetAccessor()); |
| 845 | 506 |
| 507 /** | |
| 508 * The "DJLSLosslessDecoder" and "DJLSNearLosslessDecoder" in DCMTK | |
| 509 * are exactly the same, except for the "supportedTransferSyntax()" | |
| 510 * virtual function. | |
| 511 * http://support.dcmtk.org/docs/classDJLSDecoderBase.html | |
| 512 **/ | |
| 513 | |
| 514 DJLSLosslessDecoder decoder; DJLSCodecParameter parameters; | |
| 515 //DJLSNearLosslessDecoder decoder; DJLSCodecParameter parameters; | |
| 516 | |
| 517 Uint32 startFragment = 0; // Default | |
| 518 OFString decompressedColorModel; // Out | |
| 519 DJ_RPLossless representationParameter; | |
| 520 OFCondition c = decoder.decodeFrame(&representationParameter, pixelSequence, ¶meters, | |
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521 &dataset, frame, startFragment, targetAccessor.GetBuffer(), |
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522 targetAccessor.GetSize(), decompressedColorModel); |
| 845 | 523 |
| 524 if (!c.good()) | |
| 525 { | |
| 526 throw OrthancException(ErrorCode_InternalError); | |
| 527 } | |
| 528 } | |
| 529 #endif | |
| 846 | 530 |
| 531 | |
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532 |
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533 |
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534 bool DicomImageDecoder::Decode(ImageBuffer& target, |
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535 ParsedDicomFile& dicom, |
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536 unsigned int frame) |
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537 { |
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538 DcmDataset& dataset = *dicom.GetDcmtkObject().getDataset(); |
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539 |
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540 if (IsUncompressedImage(dataset)) |
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541 { |
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542 DecodeUncompressedImage(target, dataset, frame); |
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543 return true; |
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544 } |
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545 |
| 852 | 546 |
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547 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
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548 if (IsJpegLossless(dataset)) |
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549 { |
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550 LOG(INFO) << "Decoding a JPEG-LS image"; |
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551 DecodeJpegLossless(target, dataset, frame); |
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552 return true; |
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553 } |
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554 #endif |
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555 |
| 852 | 556 |
| 557 #if ORTHANC_JPEG_ENABLED == 1 | |
| 558 // TODO Implement this part to speed up JPEG decompression | |
| 559 #endif | |
| 560 | |
| 561 | |
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562 /** |
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563 * This DICOM image format is not natively supported by |
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564 * Orthanc. As a last resort, try and decode it through |
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565 * DCMTK. This will result in higher memory consumption. This is |
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566 * actually the second example of the following page: |
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567 * http://support.dcmtk.org/docs/mod_dcmjpeg.html#Examples |
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568 **/ |
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569 |
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570 { |
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571 LOG(INFO) << "Using DCMTK to decode a compressed image"; |
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572 |
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573 std::auto_ptr<DcmDataset> converted(dynamic_cast<DcmDataset*>(dataset.clone())); |
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574 converted->chooseRepresentation(EXS_LittleEndianExplicit, NULL); |
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575 |
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576 if (converted->canWriteXfer(EXS_LittleEndianExplicit)) |
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577 { |
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578 DecodeUncompressedImageInternal(target, *converted, frame); |
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579 return true; |
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580 } |
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fully functional JPEG-LS conversion
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581 } |
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582 |
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fully functional JPEG-LS conversion
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583 return false; |
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584 } |
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859
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585 |
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ImageProcessing::Convert
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586 |
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587 static bool IsColorImage(PixelFormat format) |
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588 { |
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589 return (format == PixelFormat_RGB24 || |
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590 format == PixelFormat_RGBA32); |
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591 } |
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592 |
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593 |
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594 bool DicomImageDecoder::TruncateDecodedImage(ImageBuffer& target, |
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595 ImageBuffer& source, |
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596 PixelFormat format, |
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597 bool allowColorConversion) |
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598 { |
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599 // If specified, prevent the conversion between color and |
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600 // grayscale images |
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601 bool isSourceColor = IsColorImage(source.GetFormat()); |
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602 bool isTargetColor = IsColorImage(format); |
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603 |
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604 if (!allowColorConversion) |
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605 { |
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606 if (isSourceColor ^ isTargetColor) |
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607 { |
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608 return false; |
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609 } |
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610 } |
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611 |
| 863 | 612 if (source.GetFormat() == format) |
| 613 { | |
| 614 // No conversion is required, return the temporary image | |
| 615 target.AcquireOwnership(source); | |
| 616 return true; | |
| 617 } | |
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618 |
| 863 | 619 target.SetFormat(format); |
| 620 target.SetWidth(source.GetWidth()); | |
| 621 target.SetHeight(source.GetHeight()); | |
| 622 | |
| 623 ImageAccessor targetAccessor(target.GetAccessor()); | |
| 624 ImageAccessor sourceAccessor(source.GetAccessor()); | |
| 625 ImageProcessing::Convert(targetAccessor, sourceAccessor); | |
| 626 | |
| 627 return true; | |
| 628 } | |
| 629 | |
| 630 | |
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631 bool DicomImageDecoder::PreviewDecodedImage(ImageBuffer& target, |
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632 ImageBuffer& source) |
| 863 | 633 { |
| 634 switch (source.GetFormat()) | |
| 861 | 635 { |
| 863 | 636 case PixelFormat_RGB24: |
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637 { |
| 863 | 638 // Directly return color images (RGB) |
| 639 target.AcquireOwnership(source); | |
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640 return true; |
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641 } |
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642 |
| 863 | 643 case PixelFormat_Grayscale8: |
| 644 case PixelFormat_Grayscale16: | |
| 645 case PixelFormat_SignedGrayscale16: | |
| 646 { | |
| 647 // Grayscale image: Stretch its dynamics to the [0,255] range | |
| 648 target.SetFormat(PixelFormat_Grayscale8); | |
| 649 target.SetWidth(source.GetWidth()); | |
| 650 target.SetHeight(source.GetHeight()); | |
| 651 | |
| 652 ImageAccessor targetAccessor(target.GetAccessor()); | |
| 653 ImageAccessor sourceAccessor(source.GetAccessor()); | |
| 654 | |
| 655 int64_t a, b; | |
| 656 ImageProcessing::GetMinMaxValue(a, b, sourceAccessor); | |
| 657 | |
| 658 if (a == b) | |
| 659 { | |
| 660 ImageProcessing::Set(targetAccessor, 0); | |
| 661 } | |
| 662 else | |
| 663 { | |
| 876 | 664 ImageProcessing::ShiftScale(sourceAccessor, static_cast<float>(-a), 255.0f / static_cast<float>(b - a)); |
| 863 | 665 |
| 666 if (source.GetFormat() == PixelFormat_Grayscale8) | |
| 667 { | |
| 668 target.AcquireOwnership(source); | |
| 669 } | |
| 670 else | |
| 671 { | |
| 672 ImageProcessing::Convert(targetAccessor, sourceAccessor); | |
| 673 } | |
| 674 } | |
| 675 | |
| 676 return true; | |
| 677 } | |
| 678 | |
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679 default: |
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680 throw OrthancException(ErrorCode_NotImplemented); |
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681 } |
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682 } |
| 845 | 683 } |