1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*
-----------------------------------------------------------------------
Copyright: 2010-2016, iMinds-Vision Lab, University of Antwerp
2014-2016, CWI, Amsterdam
Contact: astra@uantwerpen.be
Website: http://www.astra-toolbox.com/
This file is part of the ASTRA Toolbox.
The ASTRA Toolbox is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
The ASTRA Toolbox is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
-----------------------------------------------------------------------
*/
#ifndef _INC_ASTRA_PARALLELPROJECTIONGEOMETRY2D
#define _INC_ASTRA_PARALLELPROJECTIONGEOMETRY2D
#include "ProjectionGeometry2D.h"
#include "ParallelVecProjectionGeometry2D.h"
namespace astra
{
/**
* This class defines a 2D parallel beam projection geometry.
*
* <img src="../images/par_proj_geom.svg" width="600"/>
* This geometry is defined by a number of parameters:
* - The number of detectors (DetCount).
* The distance between the first detector and the projection of the origin \f$O\f$ is equal to
* the distance between the last detector and the projection of \f$O\f$.
* - The width of each detector (detector width). All detectors are equidistant.
* - A list of projection angles (\f$\theta\f$), measured w.r.t. the y-axis of the volume. In Radians. Should lie in the interval \f$[-\frac{\pi}{4},\frac{7\pi}{4}]\f$.
*
* This class provides functionality to convert between detector index and detector offset \f$t\f$.
*
* \par XML Configuration
* \astra_xml_item{DetectorCount, int, Number of detectors for each projection.}
* \astra_xml_item{DetectorWidth, float, Width of each detector.}
* \astra_xml_item{ProjectionAngles, vector of float, projection angles w.r.t. the y-axis of the volume in radians.}
*
* \par MATLAB example
* \astra_code{
* proj_geom = astra_struct('parallel');\n
* proj_geom.DetectorCount = 512;\n
* proj_geom.DetectorWidth = 1.0;\n
* proj_geom.ProjectionAngles = linspace(0\,pi\,100);\n
* }
*/
class _AstraExport CParallelProjectionGeometry2D : public CProjectionGeometry2D
{
public:
/** Default constructor. Sets all numeric member variables to 0 and all pointer member variables to NULL.
*
* If an object is constructed using this default constructor, it must always be followed by a call
* to one of the init() methods before the object can be used. Any use before calling init() is not allowed,
* except calling the member function isInitialized().
*
*/
CParallelProjectionGeometry2D();
/** Constructor. Create an instance of the CParallelProjectionGeometry2D class.
*
* @param _iProjectionAngleCount Number of projection angles.
* @param _iDetectorCount Number of detectors, i.e., the number of detector measurements for each projection angle.
* @param _fDetectorWidth Width of a detector cell, in unit lengths. All detector cells are assumed to have equal width.
* @param _pfProjectionAngles Pointer to an array of projection angles. The angles will be copied from this array.
*/
CParallelProjectionGeometry2D(int _iProjectionAngleCount,
int _iDetectorCount,
float32 _fDetectorWidth,
const float32* _pfProjectionAngles);
/** Copy constructor.
*/
CParallelProjectionGeometry2D(const CParallelProjectionGeometry2D& _projGeom);
/** Destructor.
*/
~CParallelProjectionGeometry2D();
/** Assignment operator.
*/
CParallelProjectionGeometry2D& operator=(const CParallelProjectionGeometry2D& _other);
/** Initialize the geometry with a config object.
*
* @param _cfg Configuration Object
* @return initialization successful?
*/
virtual bool initialize(const Config& _cfg);
/** Initialization. Initializes an instance of the CProjectionGeometry2D class. If the object has been
* initialized before, the object is reinitialized and memory is freed and reallocated if necessary.
*
* @param _iProjectionAngleCount Number of projection angles.
* @param _iDetectorCount Number of detectors, i.e., the number of detector measurements for each projection angle.
* @param _fDetectorWidth Width of a detector cell, in unit lengths. All detector cells are assumed to have equal width.
* @param _pfProjectionAngles Pointer to an array of projection angles. The angles will be copied from this array.
*/
bool initialize(int _iProjectionAngleCount,
int _iDetectorCount,
float32 _fDetectorWidth,
const float32* _pfProjectionAngles);
/** Create a hard copy.
*/
virtual CProjectionGeometry2D* clone();
/** Return true if this geometry instance is the same as the one specified.
*
* @return true if this geometry instance is the same as the one specified.
*/
virtual bool isEqual(CProjectionGeometry2D*) const;
/** Returns true if the type of geometry defined in this class is the one specified in _sType.
*
* @param _sType geometry type to compare to.
* @return true if _sType == "parallel".
*/
virtual bool isOfType(const std::string& _sType);
/** Get all settings in a Config object.
*
* @return Configuration Object.
*/
virtual Config* getConfiguration() const;
/**
* Returns a vector describing the direction of a ray belonging to a certain detector,
* the direction is the same for all detectors in one projection
*
* @param _iProjectionIndex index of projection
* @param _iProjectionIndex index of detector
*
* @return a unit vector describing the direction
*/
virtual CVector3D getProjectionDirection(int _iProjectionIndex, int _iDetectorIndex = 0);
/** Create a vector geom
*/
CParallelVecProjectionGeometry2D* toVectorGeometry();
};
} // namespace astra
#endif /* _INC_ASTRA_PARALLELPROJECTIONGEOMETRY2D */
|
