Mercurial > hg > orthanc
annotate OrthancServer/Internals/DicomImageDecoder.cpp @ 1177:5b2d8c280ac2 db-changes
Plugins can monitor changes through callbacks
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Wed, 24 Sep 2014 17:37:44 +0200 |
| parents | f009f7c75069 |
| children | 851a55d183c9 |
| 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 { | |
| 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 std::auto_ptr<ImageAccessor> fastAccessor_; |
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229 |
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230 public: |
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231 void Setup(DcmDataset& dataset, |
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232 unsigned int frame) |
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233 { |
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234 psmct_.clear(); |
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235 slowAccessor_.reset(NULL); |
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236 fastAccessor_.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 /** |
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278 * If possible, create a fast ImageAccessor to the image buffer. |
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279 **/ |
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280 |
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281 |
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282 } |
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283 |
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284 unsigned int GetWidth() const |
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285 { |
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286 assert(slowAccessor_.get() != NULL); |
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287 return slowAccessor_->GetInformation().GetWidth(); |
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288 } |
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289 |
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290 unsigned int GetHeight() const |
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291 { |
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292 assert(slowAccessor_.get() != NULL); |
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293 return slowAccessor_->GetInformation().GetHeight(); |
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294 } |
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295 |
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296 unsigned int GetChannelCount() const |
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297 { |
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298 assert(slowAccessor_.get() != NULL); |
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299 return slowAccessor_->GetInformation().GetChannelCount(); |
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300 } |
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301 |
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302 const DicomIntegerPixelAccessor& GetAccessor() const |
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303 { |
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304 assert(slowAccessor_.get() != NULL); |
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305 return *slowAccessor_; |
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306 } |
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307 |
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308 bool HasFastAccessor() const |
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309 { |
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310 return fastAccessor_.get() != NULL; |
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311 } |
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312 |
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313 const ImageAccessor& GetFastAccessor() const |
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314 { |
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315 assert(HasFastAccessor()); |
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316 return *fastAccessor_; |
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317 } |
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318 }; |
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319 |
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320 |
| 845 | 321 void DicomImageDecoder::SetupImageBuffer(ImageBuffer& target, |
| 322 DcmDataset& dataset) | |
| 323 { | |
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324 DicomMap m; |
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325 FromDcmtkBridge::Convert(m, dataset); |
| 845 | 326 |
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327 DicomImageInformation info(m); |
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328 PixelFormat format; |
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329 |
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330 if (!info.ExtractPixelFormat(format)) |
| 845 | 331 { |
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332 LOG(WARNING) << "Unsupported DICOM image: " << info.GetBitsStored() |
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333 << "bpp, " << info.GetChannelCount() << " channels, " |
| 860 | 334 << (info.IsSigned() ? "signed" : "unsigned") |
| 335 << (info.IsPlanar() ? ", planar" : ", non-planar"); | |
| 845 | 336 throw OrthancException(ErrorCode_NotImplemented); |
| 337 } | |
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874
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338 |
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339 target.SetHeight(info.GetHeight()); |
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340 target.SetWidth(info.GetWidth()); |
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341 target.SetFormat(format); |
| 845 | 342 } |
| 343 | |
| 344 | |
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345 bool DicomImageDecoder::IsUncompressedImage(const DcmDataset& dataset) |
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346 { |
| 851 | 347 // http://support.dcmtk.org/docs/dcxfer_8h-source.html |
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348 return (dataset.getOriginalXfer() == EXS_Unknown || |
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349 dataset.getOriginalXfer() == EXS_LittleEndianImplicit || |
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350 dataset.getOriginalXfer() == EXS_BigEndianImplicit || |
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351 dataset.getOriginalXfer() == EXS_LittleEndianExplicit || |
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352 dataset.getOriginalXfer() == EXS_BigEndianExplicit); |
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353 } |
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354 |
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355 |
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356 template <typename PixelType> |
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357 static void CopyPixels(ImageAccessor& target, |
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358 const DicomIntegerPixelAccessor& source) |
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359 { |
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360 const PixelType minValue = std::numeric_limits<PixelType>::min(); |
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361 const PixelType maxValue = std::numeric_limits<PixelType>::max(); |
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362 |
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363 for (unsigned int y = 0; y < source.GetInformation().GetHeight(); y++) |
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364 { |
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365 PixelType* pixel = reinterpret_cast<PixelType*>(target.GetRow(y)); |
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366 for (unsigned int x = 0; x < source.GetInformation().GetWidth(); x++) |
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367 { |
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368 for (unsigned int c = 0; c < source.GetInformation().GetChannelCount(); c++, pixel++) |
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369 { |
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370 int32_t v = source.GetValue(x, y, c); |
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371 if (v < static_cast<int32_t>(minValue)) |
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372 { |
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373 *pixel = minValue; |
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374 } |
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375 else if (v > static_cast<int32_t>(maxValue)) |
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376 { |
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377 *pixel = maxValue; |
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378 } |
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379 else |
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380 { |
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381 *pixel = static_cast<PixelType>(v); |
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382 } |
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383 } |
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384 } |
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385 } |
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386 } |
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387 |
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388 |
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389 void DicomImageDecoder::DecodeUncompressedImage(ImageBuffer& target, |
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390 DcmDataset& dataset, |
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391 unsigned int frame) |
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392 { |
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393 if (!IsUncompressedImage(dataset)) |
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394 { |
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395 throw OrthancException(ErrorCode_BadParameterType); |
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396 } |
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397 |
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398 DecodeUncompressedImageInternal(target, dataset, frame); |
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399 } |
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400 |
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401 |
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402 void DicomImageDecoder::DecodeUncompressedImageInternal(ImageBuffer& target, |
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403 DcmDataset& dataset, |
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404 unsigned int frame) |
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405 { |
| 852 | 406 ImageSource source; |
| 407 source.Setup(dataset, frame); | |
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408 |
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409 |
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410 /** |
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411 * Resize the target image. |
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412 **/ |
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413 |
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414 SetupImageBuffer(target, dataset); |
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415 |
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416 if (source.GetWidth() != target.GetWidth() || |
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417 source.GetHeight() != target.GetHeight()) |
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418 { |
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419 throw OrthancException(ErrorCode_InternalError); |
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420 } |
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421 |
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422 |
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423 /** |
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424 * If the format of the DICOM buffer is natively supported, use a |
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425 * direct access to copy its values. |
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426 **/ |
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427 |
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428 ImageAccessor targetAccessor(target.GetAccessor()); |
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429 const DicomImageInformation& info = source.GetAccessor().GetInformation(); |
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430 |
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431 bool fastVersionSuccess = false; |
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432 PixelFormat sourceFormat; |
| 863 | 433 if (!info.IsPlanar() && |
| 434 info.ExtractPixelFormat(sourceFormat)) | |
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435 { |
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436 try |
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437 { |
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438 ImageAccessor sourceImage; |
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439 sourceImage.AssignReadOnly(sourceFormat, |
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440 info.GetWidth(), |
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441 info.GetHeight(), |
| 860 | 442 info.GetWidth() * GetBytesPerPixel(sourceFormat), |
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443 source.GetAccessor().GetPixelData()); |
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444 |
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445 ImageProcessing::Convert(targetAccessor, sourceImage); |
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446 ImageProcessing::ShiftRight(targetAccessor, info.GetShift()); |
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447 fastVersionSuccess = true; |
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448 } |
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449 catch (OrthancException&) |
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450 { |
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451 // Unsupported conversion, use the slow version |
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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 /** |
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457 * Slow version : loop over the DICOM buffer, storing its value |
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458 * into the target image. |
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459 **/ |
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460 |
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461 if (!fastVersionSuccess) |
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462 { |
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463 switch (target.GetFormat()) |
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464 { |
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465 case PixelFormat_RGB24: |
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466 case PixelFormat_RGBA32: |
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467 case PixelFormat_Grayscale8: |
| 863 | 468 CopyPixels<uint8_t>(targetAccessor, source.GetAccessor()); |
| 469 break; | |
| 860 | 470 |
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471 case PixelFormat_Grayscale16: |
| 863 | 472 CopyPixels<uint16_t>(targetAccessor, source.GetAccessor()); |
| 473 break; | |
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474 |
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475 case PixelFormat_SignedGrayscale16: |
| 863 | 476 CopyPixels<int16_t>(targetAccessor, source.GetAccessor()); |
| 477 break; | |
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478 |
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479 default: |
| 863 | 480 throw OrthancException(ErrorCode_InternalError); |
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481 } |
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482 } |
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483 } |
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484 |
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485 |
| 845 | 486 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
| 487 void DicomImageDecoder::DecodeJpegLossless(ImageBuffer& target, | |
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488 DcmDataset& dataset, |
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489 unsigned int frame) |
| 845 | 490 { |
| 491 if (!IsJpegLossless(dataset)) | |
| 492 { | |
| 493 throw OrthancException(ErrorCode_BadParameterType); | |
| 494 } | |
| 495 | |
| 496 DcmElement *element = NULL; | |
| 497 if (!dataset.findAndGetElement(ToDcmtkBridge::Convert(DICOM_TAG_PIXEL_DATA), element).good()) | |
| 498 { | |
| 499 throw OrthancException(ErrorCode_BadFileFormat); | |
| 500 } | |
| 501 | |
| 502 DcmPixelData& pixelData = dynamic_cast<DcmPixelData&>(*element); | |
| 503 DcmPixelSequence* pixelSequence = NULL; | |
| 504 if (!pixelData.getEncapsulatedRepresentation | |
| 505 (dataset.getOriginalXfer(), NULL, pixelSequence).good()) | |
| 506 { | |
| 507 throw OrthancException(ErrorCode_BadFileFormat); | |
| 508 } | |
| 509 | |
| 510 SetupImageBuffer(target, dataset); | |
| 511 | |
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512 ImageAccessor targetAccessor(target.GetAccessor()); |
| 845 | 513 |
| 514 /** | |
| 515 * The "DJLSLosslessDecoder" and "DJLSNearLosslessDecoder" in DCMTK | |
| 516 * are exactly the same, except for the "supportedTransferSyntax()" | |
| 517 * virtual function. | |
| 518 * http://support.dcmtk.org/docs/classDJLSDecoderBase.html | |
| 519 **/ | |
| 520 | |
| 521 DJLSLosslessDecoder decoder; DJLSCodecParameter parameters; | |
| 522 //DJLSNearLosslessDecoder decoder; DJLSCodecParameter parameters; | |
| 523 | |
| 524 Uint32 startFragment = 0; // Default | |
| 525 OFString decompressedColorModel; // Out | |
| 526 DJ_RPLossless representationParameter; | |
| 527 OFCondition c = decoder.decodeFrame(&representationParameter, pixelSequence, ¶meters, | |
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528 &dataset, frame, startFragment, targetAccessor.GetBuffer(), |
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529 targetAccessor.GetSize(), decompressedColorModel); |
| 845 | 530 |
| 531 if (!c.good()) | |
| 532 { | |
| 533 throw OrthancException(ErrorCode_InternalError); | |
| 534 } | |
| 535 } | |
| 536 #endif | |
| 846 | 537 |
| 538 | |
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539 |
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540 |
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541 bool DicomImageDecoder::Decode(ImageBuffer& target, |
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542 DcmDataset& dataset, |
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543 unsigned int frame) |
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544 { |
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545 if (IsUncompressedImage(dataset)) |
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546 { |
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547 DecodeUncompressedImage(target, dataset, frame); |
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548 return true; |
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549 } |
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550 |
| 852 | 551 |
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552 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
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553 if (IsJpegLossless(dataset)) |
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554 { |
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555 LOG(INFO) << "Decoding a JPEG-LS image"; |
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556 DecodeJpegLossless(target, dataset, frame); |
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557 return true; |
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558 } |
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559 #endif |
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560 |
| 852 | 561 |
| 562 #if ORTHANC_JPEG_ENABLED == 1 | |
| 563 // TODO Implement this part to speed up JPEG decompression | |
| 564 #endif | |
| 565 | |
| 566 | |
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567 /** |
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568 * This DICOM image format is not natively supported by |
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569 * Orthanc. As a last resort, try and decode it through |
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570 * DCMTK. This will result in higher memory consumption. This is |
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571 * actually the second example of the following page: |
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fully functional JPEG-LS conversion
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572 * http://support.dcmtk.org/docs/mod_dcmjpeg.html#Examples |
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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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fully functional JPEG-LS conversion
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575 { |
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fully functional JPEG-LS conversion
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576 LOG(INFO) << "Using DCMTK to decode a compressed image"; |
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fully functional JPEG-LS conversion
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577 |
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fully functional JPEG-LS conversion
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578 std::auto_ptr<DcmDataset> converted(dynamic_cast<DcmDataset*>(dataset.clone())); |
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579 converted->chooseRepresentation(EXS_LittleEndianExplicit, NULL); |
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fully functional JPEG-LS conversion
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580 |
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fully functional JPEG-LS conversion
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581 if (converted->canWriteXfer(EXS_LittleEndianExplicit)) |
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fully functional JPEG-LS conversion
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582 { |
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fully functional JPEG-LS conversion
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583 DecodeUncompressedImageInternal(target, *converted, frame); |
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584 return true; |
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fully functional JPEG-LS conversion
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585 } |
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fully functional JPEG-LS conversion
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586 } |
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fully functional JPEG-LS conversion
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587 |
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fully functional JPEG-LS conversion
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588 return false; |
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589 } |
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859
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ImageProcessing::Convert
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590 |
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ImageProcessing::Convert
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591 |
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1015
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592 static bool IsColorImage(PixelFormat format) |
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593 { |
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594 return (format == PixelFormat_RGB24 || |
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595 format == PixelFormat_RGBA32); |
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596 } |
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597 |
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fix integration tests
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598 |
| 863 | 599 bool DicomImageDecoder::DecodeAndTruncate(ImageBuffer& target, |
| 600 DcmDataset& dataset, | |
| 601 unsigned int frame, | |
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602 PixelFormat format, |
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603 bool allowColorConversion) |
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604 { |
| 863 | 605 // TODO Special case for uncompressed images |
| 606 | |
| 607 ImageBuffer source; | |
| 608 if (!Decode(source, dataset, frame)) | |
| 609 { | |
| 610 return false; | |
| 611 } | |
| 612 | |
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613 // If specified, prevent the conversion between color and |
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614 // grayscale images |
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615 bool isSourceColor = IsColorImage(source.GetFormat()); |
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616 bool isTargetColor = IsColorImage(format); |
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617 |
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618 if (!allowColorConversion) |
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619 { |
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620 if (isSourceColor ^ isTargetColor) |
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621 { |
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622 return false; |
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623 } |
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624 } |
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625 |
| 863 | 626 if (source.GetFormat() == format) |
| 627 { | |
| 628 // No conversion is required, return the temporary image | |
| 629 target.AcquireOwnership(source); | |
| 630 return true; | |
| 631 } | |
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632 |
| 863 | 633 target.SetFormat(format); |
| 634 target.SetWidth(source.GetWidth()); | |
| 635 target.SetHeight(source.GetHeight()); | |
| 636 | |
| 637 ImageAccessor targetAccessor(target.GetAccessor()); | |
| 638 ImageAccessor sourceAccessor(source.GetAccessor()); | |
| 639 ImageProcessing::Convert(targetAccessor, sourceAccessor); | |
| 640 | |
| 641 return true; | |
| 642 } | |
| 643 | |
| 644 | |
| 645 bool DicomImageDecoder::DecodePreview(ImageBuffer& target, | |
| 646 DcmDataset& dataset, | |
| 647 unsigned int frame) | |
| 648 { | |
| 649 // TODO Special case for uncompressed images | |
| 650 | |
| 651 ImageBuffer source; | |
| 652 if (!Decode(source, dataset, frame)) | |
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653 { |
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654 return false; |
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655 } |
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656 |
| 863 | 657 switch (source.GetFormat()) |
| 861 | 658 { |
| 863 | 659 case PixelFormat_RGB24: |
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660 { |
| 863 | 661 // Directly return color images (RGB) |
| 662 target.AcquireOwnership(source); | |
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663 return true; |
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664 } |
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665 |
| 863 | 666 case PixelFormat_Grayscale8: |
| 667 case PixelFormat_Grayscale16: | |
| 668 case PixelFormat_SignedGrayscale16: | |
| 669 { | |
| 670 // Grayscale image: Stretch its dynamics to the [0,255] range | |
| 671 target.SetFormat(PixelFormat_Grayscale8); | |
| 672 target.SetWidth(source.GetWidth()); | |
| 673 target.SetHeight(source.GetHeight()); | |
| 674 | |
| 675 ImageAccessor targetAccessor(target.GetAccessor()); | |
| 676 ImageAccessor sourceAccessor(source.GetAccessor()); | |
| 677 | |
| 678 int64_t a, b; | |
| 679 ImageProcessing::GetMinMaxValue(a, b, sourceAccessor); | |
| 680 | |
| 681 if (a == b) | |
| 682 { | |
| 683 ImageProcessing::Set(targetAccessor, 0); | |
| 684 } | |
| 685 else | |
| 686 { | |
| 876 | 687 ImageProcessing::ShiftScale(sourceAccessor, static_cast<float>(-a), 255.0f / static_cast<float>(b - a)); |
| 863 | 688 |
| 689 if (source.GetFormat() == PixelFormat_Grayscale8) | |
| 690 { | |
| 691 target.AcquireOwnership(source); | |
| 692 } | |
| 693 else | |
| 694 { | |
| 695 ImageProcessing::Convert(targetAccessor, sourceAccessor); | |
| 696 } | |
| 697 } | |
| 698 | |
| 699 return true; | |
| 700 } | |
| 701 | |
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702 default: |
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703 throw OrthancException(ErrorCode_NotImplemented); |
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704 } |
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705 } |
| 845 | 706 } |