Mercurial > hg > orthanc
annotate OrthancServer/Internals/DicomImageDecoder.cpp @ 1342:9ec7ac03152d
"?expand" flag for URIs "/patients", "/studies" and "/series"
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 03 Apr 2015 15:25:04 +0200 |
parents | 6e7e5ed91c2d |
children | f967bdf8534e |
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 |
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 |
847
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86 #include "../../Core/DicomFormat/DicomIntegerPixelAccessor.h" |
845 | 87 #include "../ToDcmtkBridge.h" |
847
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88 #include "../FromDcmtkBridge.h" |
845 | 89 |
847
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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 |
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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 |
942
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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") |
1206
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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 } | |
874
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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 |
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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 | |
847
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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 DcmDataset& dataset, |
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536 unsigned int frame) |
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537 { |
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538 if (IsUncompressedImage(dataset)) |
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539 { |
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540 DecodeUncompressedImage(target, dataset, frame); |
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541 return true; |
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542 } |
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543 |
852 | 544 |
847
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545 #if ORTHANC_JPEG_LOSSLESS_ENABLED == 1 |
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546 if (IsJpegLossless(dataset)) |
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547 { |
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548 LOG(INFO) << "Decoding a JPEG-LS image"; |
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549 DecodeJpegLossless(target, dataset, frame); |
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550 return true; |
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551 } |
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552 #endif |
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553 |
852 | 554 |
555 #if ORTHANC_JPEG_ENABLED == 1 | |
556 // TODO Implement this part to speed up JPEG decompression | |
557 #endif | |
558 | |
559 | |
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560 /** |
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561 * This DICOM image format is not natively supported by |
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562 * Orthanc. As a last resort, try and decode it through |
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563 * DCMTK. This will result in higher memory consumption. This is |
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564 * actually the second example of the following page: |
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565 * http://support.dcmtk.org/docs/mod_dcmjpeg.html#Examples |
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566 **/ |
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567 |
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568 { |
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569 LOG(INFO) << "Using DCMTK to decode a compressed image"; |
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570 |
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571 std::auto_ptr<DcmDataset> converted(dynamic_cast<DcmDataset*>(dataset.clone())); |
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572 converted->chooseRepresentation(EXS_LittleEndianExplicit, NULL); |
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573 |
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574 if (converted->canWriteXfer(EXS_LittleEndianExplicit)) |
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575 { |
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576 DecodeUncompressedImageInternal(target, *converted, frame); |
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577 return true; |
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578 } |
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579 } |
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580 |
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581 return false; |
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582 } |
859
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583 |
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584 |
1015
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585 static bool IsColorImage(PixelFormat format) |
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586 { |
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587 return (format == PixelFormat_RGB24 || |
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588 format == PixelFormat_RGBA32); |
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589 } |
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590 |
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591 |
863 | 592 bool DicomImageDecoder::DecodeAndTruncate(ImageBuffer& target, |
593 DcmDataset& dataset, | |
594 unsigned int frame, | |
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595 PixelFormat format, |
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596 bool allowColorConversion) |
859
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597 { |
863 | 598 // TODO Special case for uncompressed images |
599 | |
600 ImageBuffer source; | |
601 if (!Decode(source, dataset, frame)) | |
602 { | |
603 return false; | |
604 } | |
605 | |
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606 // If specified, prevent the conversion between color and |
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607 // grayscale images |
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608 bool isSourceColor = IsColorImage(source.GetFormat()); |
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609 bool isTargetColor = IsColorImage(format); |
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610 |
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611 if (!allowColorConversion) |
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612 { |
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613 if (isSourceColor ^ isTargetColor) |
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614 { |
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615 return false; |
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616 } |
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617 } |
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618 |
863 | 619 if (source.GetFormat() == format) |
620 { | |
621 // No conversion is required, return the temporary image | |
622 target.AcquireOwnership(source); | |
623 return true; | |
624 } | |
859
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625 |
863 | 626 target.SetFormat(format); |
627 target.SetWidth(source.GetWidth()); | |
628 target.SetHeight(source.GetHeight()); | |
629 | |
630 ImageAccessor targetAccessor(target.GetAccessor()); | |
631 ImageAccessor sourceAccessor(source.GetAccessor()); | |
632 ImageProcessing::Convert(targetAccessor, sourceAccessor); | |
633 | |
634 return true; | |
635 } | |
636 | |
637 | |
638 bool DicomImageDecoder::DecodePreview(ImageBuffer& target, | |
639 DcmDataset& dataset, | |
640 unsigned int frame) | |
641 { | |
642 // TODO Special case for uncompressed images | |
643 | |
644 ImageBuffer source; | |
645 if (!Decode(source, dataset, frame)) | |
859
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646 { |
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647 return false; |
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648 } |
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649 |
863 | 650 switch (source.GetFormat()) |
861 | 651 { |
863 | 652 case PixelFormat_RGB24: |
859
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653 { |
863 | 654 // Directly return color images (RGB) |
655 target.AcquireOwnership(source); | |
859
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656 return true; |
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657 } |
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658 |
863 | 659 case PixelFormat_Grayscale8: |
660 case PixelFormat_Grayscale16: | |
661 case PixelFormat_SignedGrayscale16: | |
662 { | |
663 // Grayscale image: Stretch its dynamics to the [0,255] range | |
664 target.SetFormat(PixelFormat_Grayscale8); | |
665 target.SetWidth(source.GetWidth()); | |
666 target.SetHeight(source.GetHeight()); | |
667 | |
668 ImageAccessor targetAccessor(target.GetAccessor()); | |
669 ImageAccessor sourceAccessor(source.GetAccessor()); | |
670 | |
671 int64_t a, b; | |
672 ImageProcessing::GetMinMaxValue(a, b, sourceAccessor); | |
673 | |
674 if (a == b) | |
675 { | |
676 ImageProcessing::Set(targetAccessor, 0); | |
677 } | |
678 else | |
679 { | |
876 | 680 ImageProcessing::ShiftScale(sourceAccessor, static_cast<float>(-a), 255.0f / static_cast<float>(b - a)); |
863 | 681 |
682 if (source.GetFormat() == PixelFormat_Grayscale8) | |
683 { | |
684 target.AcquireOwnership(source); | |
685 } | |
686 else | |
687 { | |
688 ImageProcessing::Convert(targetAccessor, sourceAccessor); | |
689 } | |
690 } | |
691 | |
692 return true; | |
693 } | |
694 | |
859
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695 default: |
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696 throw OrthancException(ErrorCode_NotImplemented); |
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697 } |
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698 } |
845 | 699 } |