Mercurial > hg > orthanc-stone

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

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 14 Oct 2016 15:34:11 +0200
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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 "SliceGeometry.h"
34
35 #include "GeometryToolbox.h"
36
37 #include "../Orthanc/Core/Logging.h"
38 #include "../Orthanc/Core/Toolbox.h"
39 #include "../Orthanc/Core/OrthancException.h"
40
41 namespace OrthancStone
42 {
43 void SliceGeometry::CheckAndComputeNormal()
44 {
45 // DICOM expects normal vectors to define the axes: "The row and
46 // column direction cosine vectors shall be normal, i.e., the dot
47 // product of each direction cosine vector with itself shall be
48 // unity."
49 // http://dicom.nema.org/medical/dicom/current/output/chtml/part03/sect_C.7.6.2.html
50 if (!GeometryToolbox::IsNear(boost::numeric::ublas::norm_2(axisX_), 1.0) ||
51 !GeometryToolbox::IsNear(boost::numeric::ublas::norm_2(axisY_), 1.0))
52 {
53 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
54 }
55
56 // The vectors within "Image Orientation Patient" must be
57 // orthogonal, according to the DICOM specification: "The row and
58 // column direction cosine vectors shall be orthogonal, i.e.,
59 // their dot product shall be zero."
60 // http://dicom.nema.org/medical/dicom/current/output/chtml/part03/sect_C.7.6.2.html
61 if (!GeometryToolbox::IsCloseToZero(boost::numeric::ublas::inner_prod(axisX_, axisY_)))
62 {
63 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
64 }
65
66 GeometryToolbox::CrossProduct(normal_, axisX_, axisY_);
67
68 // Just a sanity check, it should be useless by construction
69 assert(GeometryToolbox::IsNear(boost::numeric::ublas::norm_2(normal_), 1.0));
70 }
71
72
73 void SliceGeometry::SetupCanonical()
74 {
75 GeometryToolbox::AssignVector(origin_, 0, 0, 0);
76 GeometryToolbox::AssignVector(axisX_, 1, 0, 0);
77 GeometryToolbox::AssignVector(axisY_, 0, 1, 0);
78 CheckAndComputeNormal();
79 }
80
81
82 SliceGeometry::SliceGeometry(const Vector& origin,
83 const Vector& axisX,
84 const Vector& axisY) :
85 origin_(origin),
86 axisX_(axisX),
87 axisY_(axisY)
88 {
89 CheckAndComputeNormal();
90 }
91
92
93 void SliceGeometry::Setup(const std::string& imagePositionPatient,
94 const std::string& imageOrientationPatient)
95 {
96 std::string tmpPosition = Orthanc::Toolbox::StripSpaces(imagePositionPatient);
97 std::string tmpOrientation = Orthanc::Toolbox::StripSpaces(imageOrientationPatient);
98
99 Vector orientation;
100 if (!GeometryToolbox::ParseVector(origin_, tmpPosition) ||
101 !GeometryToolbox::ParseVector(orientation, tmpOrientation) ||
102 origin_.size() != 3 ||
103 orientation.size() != 6)
104 {
105 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
106 }
107
108 axisX_.resize(3);
109 axisX_[0] = orientation[0];
110 axisX_[1] = orientation[1];
111 axisX_[2] = orientation[2];
112
113 axisY_.resize(3);
114 axisY_[0] = orientation[3];
115 axisY_[1] = orientation[4];
116 axisY_[2] = orientation[5];
117
118 CheckAndComputeNormal();
119 }
120
121
122 SliceGeometry::SliceGeometry(const DicomDataset& dicom)
123 {
124 if (dicom.HasTag(DICOM_TAG_IMAGE_POSITION_PATIENT) &&
125 dicom.HasTag(DICOM_TAG_IMAGE_ORIENTATION_PATIENT))
126 {
127 Setup(dicom.GetStringValue(DICOM_TAG_IMAGE_POSITION_PATIENT),
128 dicom.GetStringValue(DICOM_TAG_IMAGE_ORIENTATION_PATIENT));
129 }
130 else
131 {
132 SetupCanonical();
133 }
134 }
135
136
137 Vector SliceGeometry::MapSliceToWorldCoordinates(double x,
138 double y) const
139 {
140 return origin_ + x * axisX_ + y * axisY_;
141 }
142
143
144 double SliceGeometry::ProjectAlongNormal(const Vector& point) const
145 {
146 return boost::numeric::ublas::inner_prod(point, normal_);
147 }
148
149
150 void SliceGeometry::ProjectPoint(double& offsetX,
151 double& offsetY,
152 const Vector& point) const
153 {
154 // Project the point onto the slice
155 Vector projection;
156 GeometryToolbox::ProjectPointOntoPlane(projection, point, normal_, origin_);
157
158 // As the axes are orthonormal vectors thanks to
159 // CheckAndComputeNormal(), the following dot products give the
160 // offset of the origin of the slice wrt. the origin of the
161 // reference plane https://en.wikipedia.org/wiki/Vector_projection
162 offsetX = boost::numeric::ublas::inner_prod(axisX_, projection - origin_);
163 offsetY = boost::numeric::ublas::inner_prod(axisY_, projection - origin_);
164 }
165 }