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/*****************************************************************************
** FILE IDENTIFICATION
**
** Name: reconstruct.cpp Reconstruction class
** Programmer: Kevin Rosenberg
** Date Started: Aug 84
**
** This is part of the CTSim program
** Copyright (c) 1983-2009 Kevin Rosenberg
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License (version 2) as
** published by the Free Software Foundation.
**
** This program 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 this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
******************************************************************************/
#include "ct.h"
/* NAME
* Reconstructor::Reconstructor Reconstruct Image from Projections
*
* SYNOPSIS
* im = proj.reconstruct (im, filt_type, filt_param, interp_type)
* IMAGE *im Output image
* int filt_type Type of convolution filter to use
* double filt_param Filter specific parameter
* Currently, used only with Hamming filters
* int interp_type Type of interpolation method to use
*
* ALGORITHM
*
* Calculate one-dimensional filter in spatial domain
* Allocate & clear (zero) the 2d output image array
* For each projection view
* Convolve raysum array with filter
* Backproject raysums and add (summate) to image array
* end
*/
Reconstructor::Reconstructor (const Projections& rProj, ImageFile& rIF, const char* const filterName,
double filt_param, const char* const filterMethodName, const int zeropad,
const char* filterGenerationName, const char* const interpName,
int interpFactor, const char* const backprojectName, const int iTrace,
ReconstructionROI* pROI, bool bRebinToParallel, SGP* pSGP)
: m_rOriginalProj(rProj),
m_pProj(bRebinToParallel ? m_rOriginalProj.interpolateToParallel() : &m_rOriginalProj),
m_rImagefile(rIF), m_pProcessSignal(0), m_pBackprojector(0),
m_iTrace(iTrace), m_bRebinToParallel(bRebinToParallel), m_bFail(false), m_adPlotXAxis(0)
{
m_nFilteredProjections = m_pProj->nDet() * interpFactor;
#ifdef HAVE_BSPLINE_INTERP
int spline_order = 0, zoom_factor = 0;
if (interp_type == I_BSPLINE) {
zoom_factor = interpFactor;
spline_order = 3;
zoom_factor = 3;
m_nFilteredProjections = (m_nDet - 1) * (zoom_factor + 1) + 1;
}
#endif
double filterBW = 1. / m_pProj->detInc();
m_pProcessSignal = new ProcessSignal (filterName, filterMethodName, filterBW, m_pProj->detInc(),
m_pProj->nDet(), filt_param, "spatial", filterGenerationName, zeropad, interpFactor, iTrace,
m_pProj->geometry(), m_pProj->focalLength(), m_pProj->sourceDetectorLength(), pSGP);
if (m_pProcessSignal->fail()) {
m_bFail = true;
m_strFailMessage = "Error creating ProcessSignal: ";
m_strFailMessage += m_pProcessSignal->failMessage();
delete m_pProcessSignal; m_pProcessSignal = NULL;
return;
}
m_pBackprojector = new Backprojector (*m_pProj, m_rImagefile, backprojectName, interpName, interpFactor, pROI);
if (m_pBackprojector->fail()) {
m_bFail = true;
m_strFailMessage = "Error creating backprojector: ";
m_strFailMessage += m_pBackprojector->failMessage();
delete m_pBackprojector; m_pBackprojector = NULL;
delete m_pProcessSignal; m_pProcessSignal = NULL;
return;
}
#ifdef HAVE_SGP
m_adPlotXAxis = new double [m_pProj->nDet()];
double x = - ((m_pProj->nDet() - 1) / 2) * m_pProj->detInc();
double xInc = m_pProj->detInc();
for (int i = 0; i < m_pProj->nDet(); i++, x += xInc)
m_adPlotXAxis[i] = x;
#endif
}
Reconstructor::~Reconstructor ()
{
if (m_bRebinToParallel)
delete m_pProj;
delete m_pBackprojector;
delete m_pProcessSignal;
delete m_adPlotXAxis;
}
void
Reconstructor::plotFilter (SGP* pSGP)
{
#ifdef HAVE_SGP
int nVecFilter = m_pProcessSignal->getNFilterPoints();
double* adPlotXAxis = new double [nVecFilter];
if (nVecFilter > 0 && pSGP) {
double f = m_pProcessSignal->getFilterMin();
double filterInc = m_pProcessSignal->getFilterIncrement();
for (int i = 0; i < nVecFilter; i++, f += filterInc)
adPlotXAxis[i] = f;
if (m_pProcessSignal->getFilter()) {
EZPlot ezplot;
ezplot.ezset ("title Filter Response");
ezplot.addCurve (adPlotXAxis, m_pProcessSignal->getFilter(), nVecFilter);
ezplot.plot (pSGP);
}
}
delete adPlotXAxis;
#endif
}
void
Reconstructor::reconstructAllViews ()
{
reconstructView (0, m_pProj->nView());
postProcessing();
}
void
Reconstructor::postProcessing()
{
m_pBackprojector->PostProcessing();
}
void
Reconstructor::reconstructView (int iStartView, int iViewCount, SGP* pSGP, bool bBackprojectView, double dGraphWidth)
{
double* adFilteredProj = new double [m_nFilteredProjections]; // filtered projections
if (iViewCount <= 0)
iViewCount = m_pProj->nView() - iStartView;
for (int iView = iStartView; iView < (iStartView + iViewCount); iView++) {
if (m_iTrace == Trace::TRACE_CONSOLE)
std::cout <<"Reconstructing view " << iView << " (last = " << m_pProj->nView() - 1 << ")\n";
const DetectorArray& rDetArray = m_pProj->getDetectorArray (iView);
const DetectorValue* detval = rDetArray.detValues();
m_pProcessSignal->filterSignal (detval, adFilteredProj);
#ifdef HAVE_BSPLINE_INTERP
if (interp_type == I_BSPLINE)
bspline (m_pProj->nDet(), zoom_factor, spline_order, adFilteredProj, adFilteredProj);
#ifdef HAVE_SGP
if (trace >= Trace::TRACE_PLOT && interp_type == I_BSPLINE && pSGP) {
bspline (m_pProj->nDet(), zoom_factor, spline_order, adFilteredProj, adFilteredProj);
ezplot_1d (adFilteredProj, m_nFilteredProjections);
}
#endif
#endif
if (bBackprojectView)
m_pBackprojector->BackprojectView (adFilteredProj, rDetArray.viewAngle());
#ifdef HAVE_SGP
if (m_iTrace >= Trace::TRACE_PLOT && pSGP) {
EZPlot ezplotProj;
std::ostringstream osXLength;
osXLength << "xlength " << dGraphWidth;
ezplotProj.ezset ("clear");
ezplotProj.ezset ("title Raw Projection");
ezplotProj.ezset ("xticks major 5");
ezplotProj.ezset ("yticks major 5");
ezplotProj.ezset ("xlabel ");
ezplotProj.ezset ("ylabel ");
ezplotProj.ezset ("yporigin 0.55");
ezplotProj.ezset ("ylength 0.45");
ezplotProj.ezset (osXLength.str().c_str());
ezplotProj.ezset ("box.");
ezplotProj.ezset ("grid.");
#if 0 // workaround c++ optimizer bug, now disabled by using /O1 in code
double* pdDetval = new double [m_pProj->nDet()];
for (unsigned int id = 0; id < m_pProj->nDet(); id++) {
pdDetval[id] = detval[id];
}
ezplotProj.addCurve (m_adPlotXAxis, pdDetval, m_pProj->nDet());
delete pdDetval;
#else
ezplotProj.addCurve (m_adPlotXAxis, detval, m_pProj->nDet());
#endif
pSGP->setTextPointSize (9);
ezplotProj.plot (pSGP);
ezplotProj.ezset ("clear");
ezplotProj.ezset ("title Filtered Projection");
ezplotProj.ezset ("xticks major 5");
ezplotProj.ezset ("xlabel ");
ezplotProj.ezset ("ylabel ");
ezplotProj.ezset ("yticks major 5");
ezplotProj.ezset ("yporigin 0.10");
ezplotProj.ezset ("ylength 0.45");
ezplotProj.ezset (osXLength.str().c_str());
ezplotProj.ezset ("box");
ezplotProj.ezset ("grid");
ezplotProj.addCurve (m_adPlotXAxis, adFilteredProj, m_nFilteredProjections);
pSGP->setTextPointSize (9);
ezplotProj.plot (pSGP);
}
#endif //HAVE_SGP
}
delete adFilteredProj;
}
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