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comparison Framework/Toolbox/DicomFrameConverter.cpp @ 0:351ab0da0150

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initial commit
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 14 Oct 2016 15:34:11 +0200
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children 4b7e0244881f
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1 /**
2 * Stone of Orthanc
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, 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 "DicomFrameConverter.h"
34
35 #include "../Orthanc/Core/Images/Image.h"
36 #include "../Orthanc/Core/Images/ImageProcessing.h"
37 #include "../Orthanc/Core/OrthancException.h"
38 #include "../Orthanc/Core/Toolbox.h"
39
40 namespace OrthancStone
41 {
42 void DicomFrameConverter::SetDefaultParameters()
43 {
44 isSigned_ = true;
45 isColor_ = false;
46 hasRescale_ = false;
47 rescaleIntercept_ = 0;
48 rescaleSlope_ = 1;
49 defaultWindowCenter_ = 128;
50 defaultWindowWidth_ = 256;
51 }
52
53
54 Orthanc::PixelFormat DicomFrameConverter::GetExpectedPixelFormat() const
55 {
56 // TODO Add more checks, e.g. on the number of bytes per value
57 // (cf. DicomImageInformation.h in Orthanc)
58
59 if (isColor_)
60 {
61 return Orthanc::PixelFormat_RGB24;
62 }
63 else if (isSigned_)
64 {
65 return Orthanc::PixelFormat_SignedGrayscale16;
66 }
67 else
68 {
69 return Orthanc::PixelFormat_Grayscale16;
70 }
71 }
72
73
74 void DicomFrameConverter::ReadParameters(const DicomDataset& dicom)
75 {
76 SetDefaultParameters();
77
78 if (dicom.HasTag(DICOM_TAG_WINDOW_CENTER))
79 {
80 Vector c, w;
81 dicom.GetVectorValue(c, DICOM_TAG_WINDOW_CENTER);
82 dicom.GetVectorValue(w, DICOM_TAG_WINDOW_WIDTH);
83
84 if (c.size() > 0 && w.size() > 0)
85 {
86 defaultWindowCenter_ = static_cast<float>(c[0]);
87 defaultWindowWidth_ = static_cast<float>(w[0]);
88 }
89 }
90
91 isSigned_ = (dicom.GetIntegerValue(DICOM_TAG_PIXEL_REPRESENTATION) == 1); // Type 1 tag, must be present
92
93 if (dicom.HasTag(DICOM_TAG_RESCALE_INTERCEPT))
94 {
95 rescaleIntercept_ = dicom.GetFloatValue(DICOM_TAG_RESCALE_INTERCEPT);
96 rescaleSlope_ = dicom.GetFloatValue(DICOM_TAG_RESCALE_SLOPE);
97 hasRescale_ = true;
98 }
99
100 std::string photometric = dicom.GetStringValue(DICOM_TAG_PHOTOMETRIC_INTERPRETATION); // Type 1 tag, must be present
101 photometric = Orthanc::Toolbox::StripSpaces(photometric);
102 isColor_ = (photometric != "MONOCHROME1" &&
103 photometric != "MONOCHROME2");
104 }
105
106
107 void DicomFrameConverter::ConvertFrame(std::auto_ptr<Orthanc::ImageAccessor>& source) const
108 {
109 assert(sizeof(float) == 4);
110
111 if (source.get() == NULL)
112 {
113 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
114 }
115
116 Orthanc::PixelFormat sourceFormat = source->GetFormat();
117
118 if (sourceFormat != GetExpectedPixelFormat())
119 {
120 throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat);
121 }
122
123 if (sourceFormat == Orthanc::PixelFormat_RGB24)
124 {
125 // No conversion has to be done
126 return;
127 }
128
129 assert(sourceFormat == Orthanc::PixelFormat_Grayscale16 ||
130 sourceFormat == Orthanc::PixelFormat_SignedGrayscale16);
131
132 // This is the case of a grayscale frame. Convert it to Float32.
133 std::auto_ptr<Orthanc::Image> converted(new Orthanc::Image(Orthanc::PixelFormat_Float32,
134 source->GetWidth(),
135 source->GetHeight()));
136 Orthanc::ImageProcessing::Convert(*converted, *source);
137
138 source.reset(NULL); // We don't need the source frame anymore
139
140 // Correct rescale slope/intercept if need be
141 if (hasRescale_)
142 {
143 for (unsigned int y = 0; y < converted->GetHeight(); y++)
144 {
145 float* p = reinterpret_cast<float*>(converted->GetRow(y));
146 for (unsigned int x = 0; x < converted->GetWidth(); x++, p++)
147 {
148 float value = *p;
149
150 if (hasRescale_)
151 {
152 value = value * rescaleSlope_ + rescaleIntercept_;
153 }
154
155 *p = value;
156 }
157 }
158 }
159
160 source = converted;
161 }
162 }