CustusX  16.5
An IGT application
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cxImageDefaultTFGenerator.cpp
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1 /*=========================================================================
2 This file is part of CustusX, an Image Guided Therapy Application.
3 
4 Copyright (c) 2008-2014, SINTEF Department of Medical Technology
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32 
34 
35 #include "vtkImageData.h"
36 #include "cxImage.h"
37 #include "cxImageLUT2D.h"
38 #include "cxImageTF3D.h"
39 #include "math.h"
40 #include "cxSettings.h"
41 #include "cxMathUtils.h"
42 
43 namespace cx
44 {
45 
47 {
48 
49 }
50 
52 {
53  // add shading for known preoperative modalities
54  if (mImage->getModality().contains("CT") || mImage->getModality().contains("MR"))
55  mImage->setShadingOn(settings()->value("View/shadingOn").value<bool>());
56 }
57 
59 {
60  ImageLUT2DPtr tf(new ImageLUT2D());
61 
62  double_pair fullRange = this->getFullScalarRange();
63  double_pair range = this->guessInitialScalarRange();
64  double smin = range.first;
65  double smax = range.second;
66 
67  IntIntMap opacity;
68  opacity[fullRange.first - 1] = 0;
69  opacity[fullRange.first] = 255;
70  tf->resetAlpha(opacity);
71 
72  ColorMap colors;
73  colors[smin] = QColor(Qt::black);
74  colors[smax] = QColor(Qt::white);
75  tf->resetColor(colors);
76 
77  return tf;
78 }
79 
81 {
82  ImageTF3DPtr tf(new ImageTF3D());
83 
84  double_pair range = this->guessInitialScalarRange();
85 
86  double smin = range.first;
87  double smax = range.second;
88  double srange = smax - smin;
89 
90  IntIntMap opacity;
91  // Note the ordering: add in descending order to ensure zero is
92  // always written into smin, also for binary volumes
93  // Round is required for binary volumes.
94  opacity[smin + roundAwayFromZero(0.5*srange)] = 255;
95  opacity[smin + roundAwayFromZero(0.3*srange)] = 255.0 * 0.7;
96  opacity[smin + roundAwayFromZero(0.1*srange)] = 0;
97  tf->resetAlpha(opacity);
98 
99  ColorMap colors;
100  colors[smin] = QColor(Qt::black);
101  colors[smax] = QColor(Qt::white);
102  tf->resetColor(colors);
103 
104  return tf;
105 }
106 
107 bool ImageDefaultTFGenerator::hasValidInitialWindow() const
108 {
109  return mImage->getInitialWindowWidth()>0;
110 }
111 
112 double_pair ImageDefaultTFGenerator::guessInitialScalarRange() const
113 {
114  double_pair srange = this->getFullScalarRange();
115 
116  if (this->hasValidInitialWindow())
117  {
118  srange = this->getInitialWindowRange();
119  }
120  // no initial window: add heuristics for each modality
121  if (!this->hasValidInitialWindow())
122  {
123  if (this->isUnsignedChar())
124  {
125  srange.first = 0;
126  srange.second = 255;
127 
128  if (this->looksLikeBinaryImage())
129  {
130  srange.first = 0;
131  srange.second = 1;
132  }
133  }
134  if (mImage->getModality().contains("CT"))
135  {
136  srange = this->guessCTRange();
137  }
138  if (mImage->getModality().contains("MR"))
139  {
140  srange = this->guessMRRange();
141  }
142  }
143 
144  srange = this->ensureNonZeroRoundedRange(srange);
145  return srange;
146 }
147 
148 bool ImageDefaultTFGenerator::isUnsignedChar() const
149 {
150  return mImage->getBaseVtkImageData()->GetScalarType() == VTK_UNSIGNED_CHAR;
151 }
152 
153 bool ImageDefaultTFGenerator::looksLikeBinaryImage() const
154 {
155  double_pair r = this->getFullScalarRange();
156  return similar(r.first, 0) && similar(r.second, 1);
157 }
158 
159 
160 double_pair ImageDefaultTFGenerator::ensureNonZeroRoundedRange(double_pair range) const
161 {
162  range.first = roundAwayFromZero(range.first);
163  range.second = roundAwayFromZero(range.second);
164  range.second = std::max(range.second, range.first+1);
165  return range;
166 }
167 
168 double_pair ImageDefaultTFGenerator::getFullScalarRange() const
169 {
170  double smin = mImage->getBaseVtkImageData()->GetScalarRange()[0];
171  double smax = mImage->getBaseVtkImageData()->GetScalarRange()[1];
172  return std::make_pair(smin, smax);
173 }
174 
175 double_pair ImageDefaultTFGenerator::getInitialWindowRange() const
176 {
177  double smin = mImage->getInitialWindowLevel() - mImage->getInitialWindowWidth()/2;
178  double smax = mImage->getInitialWindowLevel() + mImage->getInitialWindowWidth()/2;
179  return std::make_pair(smin, smax);
180 }
181 
182 double_pair ImageDefaultTFGenerator::guessCTRange() const
183 {
184  // signed: [-1024...3072]
185  // choose a default from lung to bone, approximately.
186  double smin = -500;
187  double smax = 900;
188  if (0 >= mImage->getMin()) // unsigned: [0..4096]
189  {
190  int ct_signed2unsigned = 1024;
191  smin += ct_signed2unsigned;
192  smax += ct_signed2unsigned;
193  }
194  return std::make_pair(smin, smax);
195 }
196 
197 double_pair ImageDefaultTFGenerator::guessMRRange() const
198 {
199  double_pair srange = this->getFullScalarRange();
200  srange.second *= 0.25; // usually lots of high-intensity noise of no interest
201  return srange;
202 }
203 
204 
205 } // namespace cx
Handler for the transfer functions used in 3d image volumes.
Definition: cxImageTF3D.h:72
boost::shared_ptr< class Image > ImagePtr
Definition: cxDicomWidget.h:48
Handling of color and opacity for 2D slices.
Definition: cxImageLUT2D.h:68
std::pair< double, double > double_pair
bool similar(const DoubleBoundingBox3D &a, const DoubleBoundingBox3D &b, double tol)
double roundAwayFromZero(double val)
Definition: cxMathUtils.cpp:35
std::map< int, QColor > ColorMap
Definition: cxImage.h:57
boost::shared_ptr< class ImageLUT2D > ImageLUT2DPtr
Settings * settings()
Shortcut for accessing the settings instance.
Definition: cxSettings.cpp:42
std::map< int, int > IntIntMap
Definition: cxImage.h:56
boost::shared_ptr< class ImageTF3D > ImageTF3DPtr