- unsigned int iFloorView = static_cast<int>(ppdView[ix][iy]);
- double dFracView = ppdView[ix][iy] - iFloorView;
- unsigned int iFloorDet = static_cast<int>(ppdDet[ix][iy]);
- double dFracDet = ppdDet[ix][iy] - iFloorDet;
-
- if (iFloorDet >= 0 && iFloorView >= 0) {
- std::complex<double> v1 = ppcDetValue[iFloorView][iFloorDet];
- std::complex<double> v2, v3, v4;
- if (iFloorView < nView - 1)
- v2 = ppcDetValue[iFloorView + 1][iFloorDet];
- else
- v2 = ppcDetValue[0][iFloorDet];
- if (iFloorDet < nDetWithZeros - 1)
- v4 = ppcDetValue[iFloorView][iFloorDet+1];
- else
- v4 = v1;
- if (iFloorView < nView - 1 && iFloorDet < nDetWithZeros - 1)
- v3 = ppcDetValue [iFloorView+1][iFloorDet+1];
- else if (iFloorView < nView - 1)
- v3 = v2;
- else
- v3 = ppcDetValue[0][iFloorDet+1];
- std::complex<double> vInterp = (1 - dFracView) * (1 - dFracDet) * v1 +
- dFracView * (1 - dFracDet) * v2 + dFracView * dFracDet * v3 +
- dFracDet * (1 - dFracView) * v4;
- v[ix][iy] = vInterp.real();
- if (vImag)
- vImag[ix][iy] = vInterp.imag();
- } else {
- sys_error (ERR_SEVERE, "Can't find projection data for ix=%d,iy=%d with radView=%f and radDet=%f",
- ix, iy, ppdView[ix][iy], ppdDet[ix][iy]);
- v[ix][iy] = 0;
- if (vImag)
- vImag[ix][iy] = 0;
- }