** This is part of the CTSim program
** Copyright (C) 1983-2000 Kevin Rosenberg
**
-** $Id: backprojectors.cpp,v 1.15 2000/12/03 15:16:18 kevin Exp $
+** $Id: backprojectors.cpp,v 1.20 2000/12/18 09:31:26 kevin Exp $
**
** 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
// PURPOSE
// Pure virtual base class for all backprojectors.
-Backproject::Backproject (const Projections& proj, ImageFile& im, const int interpType, const int interpFactor)
+Backproject::Backproject (const Projections& proj, ImageFile& im, int interpType, const int interpFactor)
: proj(proj), im(im), interpType(interpType), m_interpFactor(interpFactor)
{
detInc = proj.detInc();
nDet = proj.nDet();
iDetCenter = (nDet - 1) / 2; // index refering to L=0 projection
rotScale = proj.rotInc();
- rotScale /= (proj.nView() * proj.rotInc() / PI); // scale by number of PI rotations
+
+ if (proj.geometry() == Scanner::GEOMETRY_PARALLEL)\r
+ rotScale /= (proj.nView() * proj.rotInc() / PI); // scale by number of PI rotations\r
+ else if (proj.geometry() == Scanner::GEOMETRY_EQUIANGULAR || proj.geometry() == Scanner::GEOMETRY_EQUILINEAR)\r
+ rotScale /= (proj.nView() * proj.rotInc() / (2 * PI)); // scale by number of 2PI rotations\r
+ else\r
+ sys_error (ERR_SEVERE, "Invalid geometry type %d [Backproject::Backproject]", proj.geometry());\r
v = im.getArray();
nx = im.nx();
}
void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double L, int iDetPos)
-{
- ostringstream os;
+{\r
+#if 1
+ std::ostringstream os;
os << "ix=" << ix << ", iy=" << iy << ", theta=" << theta << ", L=" << L << ", detinc=" << detInc << "\n";
os << "ndet=" << nDet << ", detInc=" << detInc << ", iDetCenter=" << iDetCenter << "\n";
os << "xMin=" << xMin << ", xMax=" << xMax << ", xInc=" << xInc << "\n";
os << "yMin=" << yMin << ", yMax=" << yMax << ", yInc=" << yInc << "\n";
os << "iDetPos index outside bounds: " << iDetPos << " [backprojector]";;
- sys_error (ERR_WARNING, os.str().c_str());
+ sys_error (ERR_WARNING, os.str().c_str());\r
+#endif
}
// Precalculates trigometric function value for each point in image for backprojection.
BackprojectTable::BackprojectTable (const Projections& proj, ImageFile& im, int interpType, const int interpFactor)
- : Backproject::Backproject (proj, im, interpType, interpFactor)
+ : Backproject (proj, im, interpType, interpFactor)
{
arrayR.initSetSize (im.nx(), im.ny());
arrayPhi.initSetSize (im.nx(), im.ny());
// Iterates in x & y direction by adding difference in L position
BackprojectDiff::BackprojectDiff (const Projections& proj, ImageFile& im, int interpType, const int interpFactor)
- : Backproject::Backproject (proj, im, interpType, interpFactor)
+ : Backproject (proj, im, interpType, interpFactor)
{
// calculate center of first pixel v[0][0]
double x = xMin + xInc / 2;
kint32 detPosColStart = nearest<kint32> ((start_r * cos (theta - start_phi) / detInc + iDetCenter) * scale);
// precalculate scaled difference for linear interpolation
- double deltaFilteredProj [nDet];
+ double* deltaFilteredProj = new double [nDet];
if (interpType == Backprojector::INTERP_LINEAR) {
for (int i = 0; i < nDet - 1; i++)
deltaFilteredProj[i] = (filteredProj[i+1] - filteredProj[i]) * dInvScale;
*pImCol++ += filteredProj[iDetPos] + (detRemainder * deltaFilteredProj[iDetPos]);
} // end for iy
} //end linear
- } // end for ix
+ } // end for ix\r
+\r
+ delete deltaFilteredProj;
}