Mercurial > hg > orthanc
annotate OrthancServer/Internals/DicomImageDecoder.cpp @ 1826:ac5b0b4e2434
refactoring of DicomImageDecoder
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Wed, 25 Nov 2015 16:00:57 +0100 |
| parents | b530c3dfe2a6 |
| children | b1291df2f780 |
| rev | line source |
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| 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/Image.h" |
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86 #include "../../Core/Images/ImageProcessing.h" |
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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 #include <dcmtk/dcmdata/dcfilefo.h> |
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95 |
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96 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
| 845 | 97 #include <dcmtk/dcmjpls/djcodecd.h> |
| 98 #include <dcmtk/dcmjpls/djcparam.h> | |
| 99 #include <dcmtk/dcmjpeg/djrplol.h> | |
| 100 #endif | |
| 101 | |
| 102 | |
| 103 namespace Orthanc | |
| 104 { | |
| 846 | 105 static const DicomTag DICOM_TAG_CONTENT(0x07a1, 0x100a); |
| 106 static const DicomTag DICOM_TAG_COMPRESSION_TYPE(0x07a1, 0x1011); | |
| 107 | |
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108 |
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109 static bool IsJpegLossless(const DcmDataset& dataset) |
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110 { |
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111 // http://support.dcmtk.org/docs/dcxfer_8h-source.html |
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112 return (dataset.getOriginalXfer() == EXS_JPEGLSLossless || |
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113 dataset.getOriginalXfer() == EXS_JPEGLSLossy); |
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114 } |
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115 |
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116 |
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117 static bool IsPsmctRle1(DcmDataset& dataset) |
| 846 | 118 { |
| 119 DcmElement* e; | |
| 120 char* c; | |
| 121 | |
| 122 // Check whether the DICOM instance contains an image encoded with | |
| 123 // the PMSCT_RLE1 scheme. | |
| 124 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_COMPRESSION_TYPE), e).good() || | |
| 125 e == NULL || | |
| 126 !e->isaString() || | |
| 127 !e->getString(c).good() || | |
| 128 c == NULL || | |
| 129 strcmp("PMSCT_RLE1", c)) | |
| 130 { | |
| 131 return false; | |
| 132 } | |
| 133 else | |
| 134 { | |
| 135 return true; | |
| 136 } | |
| 137 } | |
| 138 | |
| 139 | |
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140 static bool DecodePsmctRle1(std::string& output, |
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141 DcmDataset& dataset) |
| 846 | 142 { |
| 143 // Check whether the DICOM instance contains an image encoded with | |
| 144 // the PMSCT_RLE1 scheme. | |
| 145 if (!IsPsmctRle1(dataset)) | |
| 146 { | |
| 147 return false; | |
| 148 } | |
| 149 | |
| 150 // OK, this is a custom RLE encoding from Philips. Get the pixel | |
| 151 // data from the appropriate private DICOM tag. | |
| 152 Uint8* pixData = NULL; | |
| 153 DcmElement* e; | |
| 154 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_CONTENT), e).good() || | |
| 155 e == NULL || | |
| 156 e->getUint8Array(pixData) != EC_Normal) | |
| 157 { | |
| 158 return false; | |
| 159 } | |
| 160 | |
| 161 // The "unsigned" below IS VERY IMPORTANT | |
| 162 const uint8_t* inbuffer = reinterpret_cast<const uint8_t*>(pixData); | |
| 163 const size_t length = e->getLength(); | |
| 164 | |
| 165 /** | |
| 166 * The code below is an adaptation of a sample code for GDCM by | |
| 167 * Mathieu Malaterre (under a BSD license). | |
| 168 * http://gdcm.sourceforge.net/html/rle2img_8cxx-example.html | |
| 169 **/ | |
| 170 | |
| 171 // RLE pass | |
| 172 std::vector<uint8_t> temp; | |
| 173 temp.reserve(length); | |
| 174 for (size_t i = 0; i < length; i++) | |
| 175 { | |
| 176 if (inbuffer[i] == 0xa5) | |
| 177 { | |
| 178 temp.push_back(inbuffer[i+2]); | |
| 179 for (uint8_t repeat = inbuffer[i + 1]; repeat != 0; repeat--) | |
| 180 { | |
| 181 temp.push_back(inbuffer[i+2]); | |
| 182 } | |
| 183 i += 2; | |
| 184 } | |
| 185 else | |
| 186 { | |
| 187 temp.push_back(inbuffer[i]); | |
| 188 } | |
| 189 } | |
| 190 | |
| 191 // Delta encoding pass | |
| 192 uint16_t delta = 0; | |
| 193 output.clear(); | |
| 194 output.reserve(temp.size()); | |
| 195 for (size_t i = 0; i < temp.size(); i++) | |
| 196 { | |
| 197 uint16_t value; | |
| 198 | |
| 199 if (temp[i] == 0x5a) | |
| 200 { | |
| 201 uint16_t v1 = temp[i + 1]; | |
| 202 uint16_t v2 = temp[i + 2]; | |
| 203 value = (v2 << 8) + v1; | |
| 204 i += 2; | |
| 205 } | |
| 206 else | |
| 207 { | |
| 208 value = delta + (int8_t) temp[i]; | |
| 209 } | |
| 210 | |
| 211 output.push_back(value & 0xff); | |
| 212 output.push_back(value >> 8); | |
| 213 delta = value; | |
| 214 } | |
| 215 | |
| 216 if (output.size() % 2) | |
| 217 { | |
| 218 output.resize(output.size() - 1); | |
| 219 } | |
| 220 | |
| 221 return true; | |
| 222 } | |
| 223 | |
| 224 | |
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225 class DicomImageDecoder::ImageSource |
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226 { |
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227 private: |
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228 std::string psmct_; |
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229 std::auto_ptr<DicomIntegerPixelAccessor> slowAccessor_; |
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230 |
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231 public: |
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232 void Setup(DcmDataset& dataset, |
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233 unsigned int frame) |
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234 { |
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235 psmct_.clear(); |
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236 slowAccessor_.reset(NULL); |
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237 |
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238 // See also: http://support.dcmtk.org/wiki/dcmtk/howto/accessing-compressed-data |
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239 |
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240 DicomMap m; |
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241 FromDcmtkBridge::Convert(m, dataset); |
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242 |
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243 /** |
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244 * Create an accessor to the raw values of the DICOM image. |
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245 **/ |
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246 |
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247 DcmElement* e; |
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248 if (dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_PIXEL_DATA), e).good() && |
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249 e != NULL) |
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250 { |
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251 Uint8* pixData = NULL; |
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252 if (e->getUint8Array(pixData) == EC_Normal) |
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253 { |
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254 slowAccessor_.reset(new DicomIntegerPixelAccessor(m, pixData, e->getLength())); |
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255 } |
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256 } |
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257 else if (DecodePsmctRle1(psmct_, dataset)) |
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258 { |
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259 LOG(INFO) << "The PMSCT_RLE1 decoding has succeeded"; |
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260 Uint8* pixData = NULL; |
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261 if (psmct_.size() > 0) |
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262 { |
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263 pixData = reinterpret_cast<Uint8*>(&psmct_[0]); |
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264 } |
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265 |
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266 slowAccessor_.reset(new DicomIntegerPixelAccessor(m, pixData, psmct_.size())); |
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267 } |
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268 |
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269 if (slowAccessor_.get() == NULL) |
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270 { |
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271 throw OrthancException(ErrorCode_BadFileFormat); |
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272 } |
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273 |
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274 slowAccessor_->SetCurrentFrame(frame); |
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275 } |
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276 |
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277 unsigned int GetWidth() const |
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278 { |
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279 assert(slowAccessor_.get() != NULL); |
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280 return slowAccessor_->GetInformation().GetWidth(); |
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281 } |
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282 |
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283 unsigned int GetHeight() const |
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284 { |
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285 assert(slowAccessor_.get() != NULL); |
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286 return slowAccessor_->GetInformation().GetHeight(); |
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287 } |
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288 |
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289 unsigned int GetChannelCount() const |
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290 { |
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291 assert(slowAccessor_.get() != NULL); |
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292 return slowAccessor_->GetInformation().GetChannelCount(); |
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293 } |
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294 |
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295 const DicomIntegerPixelAccessor& GetAccessor() const |
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296 { |
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297 assert(slowAccessor_.get() != NULL); |
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298 return *slowAccessor_; |
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299 } |
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300 |
| 1190 | 301 unsigned int GetSize() const |
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302 { |
| 1190 | 303 assert(slowAccessor_.get() != NULL); |
| 304 return slowAccessor_->GetSize(); | |
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305 } |
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306 }; |
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307 |
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308 |
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309 ImageAccessor* DicomImageDecoder::CreateImage(DcmDataset& dataset) |
| 845 | 310 { |
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311 DicomMap m; |
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312 FromDcmtkBridge::Convert(m, dataset); |
| 845 | 313 |
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314 DicomImageInformation info(m); |
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315 PixelFormat format; |
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316 |
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317 if (!info.ExtractPixelFormat(format)) |
| 845 | 318 { |
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319 LOG(WARNING) << "Unsupported DICOM image: " << info.GetBitsStored() |
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320 << "bpp, " << info.GetChannelCount() << " channels, " |
| 860 | 321 << (info.IsSigned() ? "signed" : "unsigned") |
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322 << (info.IsPlanar() ? ", planar, " : ", non-planar, ") |
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323 << EnumerationToString(info.GetPhotometricInterpretation()) |
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324 << " photometric interpretation"; |
| 845 | 325 throw OrthancException(ErrorCode_NotImplemented); |
| 326 } | |
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327 |
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328 return new Image(format, info.GetWidth(), info.GetHeight()); |
| 845 | 329 } |
| 330 | |
| 331 | |
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332 bool DicomImageDecoder::IsUncompressedImage(const DcmDataset& dataset) |
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333 { |
| 851 | 334 // http://support.dcmtk.org/docs/dcxfer_8h-source.html |
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335 return (dataset.getOriginalXfer() == EXS_Unknown || |
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336 dataset.getOriginalXfer() == EXS_LittleEndianImplicit || |
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337 dataset.getOriginalXfer() == EXS_BigEndianImplicit || |
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338 dataset.getOriginalXfer() == EXS_LittleEndianExplicit || |
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339 dataset.getOriginalXfer() == EXS_BigEndianExplicit); |
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340 } |
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341 |
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342 |
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343 template <typename PixelType> |
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344 static void CopyPixels(ImageAccessor& target, |
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345 const DicomIntegerPixelAccessor& source) |
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346 { |
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347 const PixelType minValue = std::numeric_limits<PixelType>::min(); |
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348 const PixelType maxValue = std::numeric_limits<PixelType>::max(); |
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349 |
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350 for (unsigned int y = 0; y < source.GetInformation().GetHeight(); y++) |
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351 { |
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352 PixelType* pixel = reinterpret_cast<PixelType*>(target.GetRow(y)); |
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353 for (unsigned int x = 0; x < source.GetInformation().GetWidth(); x++) |
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354 { |
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355 for (unsigned int c = 0; c < source.GetInformation().GetChannelCount(); c++, pixel++) |
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356 { |
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357 int32_t v = source.GetValue(x, y, c); |
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358 if (v < static_cast<int32_t>(minValue)) |
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359 { |
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360 *pixel = minValue; |
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361 } |
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362 else if (v > static_cast<int32_t>(maxValue)) |
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363 { |
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364 *pixel = maxValue; |
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365 } |
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366 else |
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367 { |
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368 *pixel = static_cast<PixelType>(v); |
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369 } |
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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 ImageAccessor* DicomImageDecoder::DecodeUncompressedImage(DcmDataset& dataset, |
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377 unsigned int frame) |
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378 { |
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379 if (!IsUncompressedImage(dataset)) |
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380 { |
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381 throw OrthancException(ErrorCode_BadParameterType); |
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382 } |
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383 |
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384 return DecodeUncompressedImageInternal(dataset, frame); |
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385 } |
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386 |
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387 |
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388 ImageAccessor* DicomImageDecoder::DecodeUncompressedImageInternal(DcmDataset& dataset, |
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389 unsigned int frame) |
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390 { |
| 852 | 391 ImageSource source; |
| 392 source.Setup(dataset, frame); | |
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393 |
|
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394 |
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395 /** |
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396 * Resize the target image. |
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397 **/ |
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398 |
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399 std::auto_ptr<ImageAccessor> target(CreateImage(dataset)); |
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400 |
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401 if (source.GetWidth() != target->GetWidth() || |
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402 source.GetHeight() != target->GetHeight()) |
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403 { |
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404 throw OrthancException(ErrorCode_InternalError); |
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405 } |
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406 |
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407 |
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408 /** |
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409 * If the format of the DICOM buffer is natively supported, use a |
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410 * direct access to copy its values. |
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411 **/ |
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412 |
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413 const DicomImageInformation& info = source.GetAccessor().GetInformation(); |
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414 |
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415 bool fastVersionSuccess = false; |
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416 PixelFormat sourceFormat; |
| 863 | 417 if (!info.IsPlanar() && |
| 418 info.ExtractPixelFormat(sourceFormat)) | |
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419 { |
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420 try |
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421 { |
| 1190 | 422 size_t frameSize = info.GetHeight() * info.GetWidth() * GetBytesPerPixel(sourceFormat); |
| 423 if ((frame + 1) * frameSize <= source.GetSize()) | |
| 424 { | |
| 425 const uint8_t* buffer = reinterpret_cast<const uint8_t*>(source.GetAccessor().GetPixelData()); | |
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426 |
| 1190 | 427 ImageAccessor sourceImage; |
| 428 sourceImage.AssignReadOnly(sourceFormat, | |
| 429 info.GetWidth(), | |
| 430 info.GetHeight(), | |
| 431 info.GetWidth() * GetBytesPerPixel(sourceFormat), | |
| 432 buffer + frame * frameSize); | |
| 433 | |
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434 ImageProcessing::Convert(*target, sourceImage); |
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435 ImageProcessing::ShiftRight(*target, info.GetShift()); |
| 1190 | 436 fastVersionSuccess = true; |
| 437 } | |
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438 } |
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439 catch (OrthancException&) |
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440 { |
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441 // Unsupported conversion, use the slow version |
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442 } |
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443 } |
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444 |
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445 /** |
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446 * Slow version : loop over the DICOM buffer, storing its value |
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447 * into the target image. |
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448 **/ |
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449 |
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450 if (!fastVersionSuccess) |
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451 { |
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452 switch (target->GetFormat()) |
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453 { |
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454 case PixelFormat_RGB24: |
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455 case PixelFormat_RGBA32: |
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456 case PixelFormat_Grayscale8: |
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457 CopyPixels<uint8_t>(*target, source.GetAccessor()); |
| 863 | 458 break; |
| 860 | 459 |
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460 case PixelFormat_Grayscale16: |
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461 CopyPixels<uint16_t>(*target, source.GetAccessor()); |
| 863 | 462 break; |
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463 |
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464 case PixelFormat_SignedGrayscale16: |
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465 CopyPixels<int16_t>(*target, source.GetAccessor()); |
| 863 | 466 break; |
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467 |
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468 default: |
| 863 | 469 throw OrthancException(ErrorCode_InternalError); |
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470 } |
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471 } |
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472 |
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473 return target.release(); |
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474 } |
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475 |
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476 |
| 845 | 477 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
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478 ImageAccessor* DicomImageDecoder::DecodeJpegLossless(DcmDataset& dataset, |
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479 unsigned int frame) |
| 845 | 480 { |
| 481 if (!IsJpegLossless(dataset)) | |
| 482 { | |
| 483 throw OrthancException(ErrorCode_BadParameterType); | |
| 484 } | |
| 485 | |
| 486 DcmElement *element = NULL; | |
| 487 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_PIXEL_DATA), element).good()) | |
| 488 { | |
| 489 throw OrthancException(ErrorCode_BadFileFormat); | |
| 490 } | |
| 491 | |
| 492 DcmPixelData& pixelData = dynamic_cast<DcmPixelData&>(*element); | |
| 493 DcmPixelSequence* pixelSequence = NULL; | |
| 494 if (!pixelData.getEncapsulatedRepresentation | |
| 495 (dataset.getOriginalXfer(), NULL, pixelSequence).good()) | |
| 496 { | |
| 497 throw OrthancException(ErrorCode_BadFileFormat); | |
| 498 } | |
| 499 | |
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500 std::auto_ptr<ImageAccessor> target(CreateImage(dataset)); |
| 845 | 501 |
| 502 /** | |
| 503 * The "DJLSLosslessDecoder" and "DJLSNearLosslessDecoder" in DCMTK | |
| 504 * are exactly the same, except for the "supportedTransferSyntax()" | |
| 505 * virtual function. | |
| 506 * http://support.dcmtk.org/docs/classDJLSDecoderBase.html | |
| 507 **/ | |
| 508 | |
| 509 DJLSLosslessDecoder decoder; DJLSCodecParameter parameters; | |
| 510 //DJLSNearLosslessDecoder decoder; DJLSCodecParameter parameters; | |
| 511 | |
| 512 Uint32 startFragment = 0; // Default | |
| 513 OFString decompressedColorModel; // Out | |
| 514 DJ_RPLossless representationParameter; | |
| 515 OFCondition c = decoder.decodeFrame(&representationParameter, pixelSequence, ¶meters, | |
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516 &dataset, frame, startFragment, target->GetBuffer(), |
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517 target->GetSize(), decompressedColorModel); |
| 845 | 518 |
| 519 if (!c.good()) | |
| 520 { | |
| 521 throw OrthancException(ErrorCode_InternalError); | |
| 522 } | |
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523 |
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524 return target.release(); |
| 845 | 525 } |
| 526 #endif | |
| 846 | 527 |
| 528 | |
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529 |
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530 |
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531 ImageAccessor* DicomImageDecoder::Decode(ParsedDicomFile& dicom, |
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532 unsigned int frame) |
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533 { |
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534 DcmDataset& dataset = *dicom.GetDcmtkObject().getDataset(); |
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535 |
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536 if (IsUncompressedImage(dataset)) |
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537 { |
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538 return DecodeUncompressedImage(dataset, frame); |
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539 } |
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540 |
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541 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
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542 if (IsJpegLossless(dataset)) |
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543 { |
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544 LOG(INFO) << "Decoding a JPEG-LS image"; |
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545 return DecodeJpegLossless(dataset, frame); |
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546 } |
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547 #endif |
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548 |
| 852 | 549 |
| 550 #if ORTHANC_JPEG_ENABLED == 1 | |
| 551 // TODO Implement this part to speed up JPEG decompression | |
| 552 #endif | |
| 553 | |
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554 /** |
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555 * This DICOM image format is not natively supported by |
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556 * Orthanc. As a last resort, try and decode it through |
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557 * DCMTK. This will result in higher memory consumption. This is |
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558 * actually the second example of the following page: |
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559 * http://support.dcmtk.org/docs/mod_dcmjpeg.html#Examples |
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560 **/ |
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561 |
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562 { |
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563 LOG(INFO) << "Using DCMTK to decode a compressed image"; |
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564 |
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565 std::auto_ptr<DcmDataset> converted(dynamic_cast<DcmDataset*>(dataset.clone())); |
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566 converted->chooseRepresentation(EXS_LittleEndianExplicit, NULL); |
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567 |
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568 if (converted->canWriteXfer(EXS_LittleEndianExplicit)) |
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569 { |
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570 return DecodeUncompressedImageInternal(*converted, frame); |
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571 } |
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572 } |
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573 |
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574 return NULL; |
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575 } |
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859
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576 |
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577 |
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578 static bool IsColorImage(PixelFormat format) |
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579 { |
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580 return (format == PixelFormat_RGB24 || |
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581 format == PixelFormat_RGBA32); |
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582 } |
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583 |
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584 |
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585 bool DicomImageDecoder::TruncateDecodedImage(std::auto_ptr<ImageAccessor>& image, |
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586 PixelFormat format, |
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587 bool allowColorConversion) |
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588 { |
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589 // If specified, prevent the conversion between color and |
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590 // grayscale images |
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591 bool isSourceColor = IsColorImage(image->GetFormat()); |
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592 bool isTargetColor = IsColorImage(format); |
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593 |
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594 if (!allowColorConversion) |
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595 { |
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596 if (isSourceColor ^ isTargetColor) |
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597 { |
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598 return false; |
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599 } |
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600 } |
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601 |
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602 if (image->GetFormat() != format) |
| 863 | 603 { |
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604 // A conversion is required |
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605 std::auto_ptr<ImageAccessor> target(new Image(format, image->GetWidth(), image->GetHeight())); |
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606 ImageProcessing::Convert(*target, *image); |
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607 image = target; |
| 863 | 608 } |
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609 |
| 863 | 610 return true; |
| 611 } | |
| 612 | |
| 613 | |
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614 bool DicomImageDecoder::PreviewDecodedImage(std::auto_ptr<ImageAccessor>& image) |
| 863 | 615 { |
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616 switch (image->GetFormat()) |
| 861 | 617 { |
| 863 | 618 case PixelFormat_RGB24: |
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619 { |
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620 // Directly return color images without modification (RGB) |
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621 return true; |
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622 } |
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623 |
| 863 | 624 case PixelFormat_Grayscale8: |
| 625 case PixelFormat_Grayscale16: | |
| 626 case PixelFormat_SignedGrayscale16: | |
| 627 { | |
| 628 // Grayscale image: Stretch its dynamics to the [0,255] range | |
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629 int64_t a, b; |
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630 ImageProcessing::GetMinMaxValue(a, b, *image); |
| 863 | 631 |
| 632 if (a == b) | |
| 633 { | |
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634 ImageProcessing::Set(*image, 0); |
| 863 | 635 } |
| 636 else | |
| 637 { | |
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638 ImageProcessing::ShiftScale(*image, static_cast<float>(-a), 255.0f / static_cast<float>(b - a)); |
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639 } |
| 863 | 640 |
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641 // If the source image is not grayscale 8bpp, convert it |
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642 if (image->GetFormat() != PixelFormat_Grayscale8) |
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643 { |
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644 std::auto_ptr<ImageAccessor> target(new Image(PixelFormat_Grayscale8, image->GetWidth(), image->GetHeight())); |
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645 ImageProcessing::Convert(*target, *image); |
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646 image = target; |
| 863 | 647 } |
| 648 | |
| 649 return true; | |
| 650 } | |
| 651 | |
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652 default: |
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653 throw OrthancException(ErrorCode_NotImplemented); |
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654 } |
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655 } |
| 845 | 656 } |