** This is part of the CTSim program
** Copyright (C) 1983-2000 Kevin Rosenberg
**
-** $Id: projections.cpp,v 1.3 2000/06/20 17:54:51 kevin Exp $
+** $Id: projections.cpp,v 1.18 2000/07/29 19:50:08 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
/* NAME
- * projections_write_header Write data header for projections file
+ * Projections::headerWwrite Write data header for projections file
*
*/
bool
Projections::headerWrite (fnetorderstream& fs)
{
- kuint32 _hsize = m_headerSize;
+ kuint16 _hsize = m_headerSize;
+ kuint16 _signature = m_signature;
kuint32 _nView = m_nView;
kuint32 _nDet = m_nDet;
kuint32 _geom = m_geometry;
- kuint32 _remarksize = m_remark.length();
+ kuint16 _remarksize = m_remark.length();
+ kuint16 _year = m_year;
+ kuint16 _month = m_month;
+ kuint16 _day = m_day;
+ kuint16 _hour = m_hour;
+ kuint16 _minute = m_minute;
+ kuint16 _second = m_second;
+
kfloat64 _calcTime = m_calcTime;
kfloat64 _rotStart = m_rotStart;
kfloat64 _rotInc = m_rotInc;
if (! fs)
return false;
- fs.writeInt32 (_hsize);
+ fs.writeInt16 (_hsize);
+ fs.writeInt16 (_signature);
fs.writeInt32 (_nView);
fs.writeInt32 (_nDet);
fs.writeInt32 (_geom);
fs.writeFloat64 (_detStart);
fs.writeFloat64 (_detInc);
fs.writeFloat64 (_phmLen);
- fs.writeInt32 (_remarksize);
+ fs.writeInt16 (_year);
+ fs.writeInt16 (_month);
+ fs.writeInt16 (_day);
+ fs.writeInt16 (_hour);
+ fs.writeInt16 (_minute);
+ fs.writeInt16 (_second);
+ fs.writeInt16 (_remarksize);
fs.write (m_remark.c_str(), _remarksize);
m_headerSize = fs.tellp();
_hsize = m_headerSize;
fs.seekp(0);
- fs.writeInt32 (_hsize);
+ fs.writeInt16 (_hsize);
if (! fs)
return false;
bool
Projections::headerRead (fnetorderstream& fs)
{
- kuint32 _hsize;
- kuint32 _nView;
- kuint32 _nDet;
- kuint32 _geom;
- kuint32 _remarksize = 0;
- kfloat64 _calcTime;
- kfloat64 _rotStart;
- kfloat64 _rotInc;
- kfloat64 _detStart;
- kfloat64 _detInc;
- kfloat64 _phmLen;
+ kuint16 _hsize, _signature, _year, _month, _day, _hour, _minute, _second, _remarksize = 0;
+ kuint32 _nView, _nDet, _geom;
+ kfloat64 _calcTime, _rotStart, _rotInc, _detStart, _detInc, _phmLen;
fs.seekg(0);
if (! fs)
return false;
- off_t testPos;
- fs.readInt32 (_hsize);
+ fs.readInt16 (_hsize);
+ fs.readInt16 (_signature);
fs.readInt32 (_nView);
fs.readInt32 (_nDet);
fs.readInt32 (_geom);
fs.readFloat64 (_detStart);
fs.readFloat64 (_detInc);
fs.readFloat64 (_phmLen);
- fs.readInt32 (_remarksize);
- if (_remarksize > 100000) {
- sys_error (ERR_SEVERE, "Insane _remarksize %d [projections::headerRead]", _remarksize);
- return false;
- }
+ fs.readInt16 (_year);
+ fs.readInt16 (_month);
+ fs.readInt16 (_day);
+ fs.readInt16 (_hour);
+ fs.readInt16 (_minute);
+ fs.readInt16 (_second);
+ fs.readInt16 (_remarksize);
if (! fs) {
sys_error (ERR_SEVERE, "Error reading header information , _remarksize=%d [projections_read_header]", _remarksize);
return false;
}
+ if (_signature != m_signature) {
+ sys_error (ERR_SEVERE, "File %s does not have a valid projection file signature", m_filename.c_str());
+ return false;
+ }
+
char remarkStorage[_remarksize+1];
fs.read (remarkStorage, _remarksize);
if (! fs) {
m_detStart = _detStart;
m_detInc = _detInc;
m_phmLen = _phmLen;
+ m_year = _year;
+ m_month = _month;
+ m_day = _day;
+ m_hour = _hour;
+ m_minute = _minute;
+ m_second = _second;
+
+ m_label.setLabelType (Array2dFileLabel::L_HISTORY);
+ m_label.setLabelString (m_remark);
+ m_label.setCalcTime (m_calcTime);
+ m_label.setDateTime (m_year, m_month, m_day, m_hour, m_minute, m_second);
return true;
}
Projections::read (const char* filename)
{
frnetorderstream fileRead (filename, ios::in | ios::binary);
+ m_filename = filename;
if (! fileRead)
return false;
Projections::write (const char* filename)
{
frnetorderstream fs (filename, ios::out | ios::binary | ios::trunc | ios::ate);
-
+ m_filename = filename;
if (! fs) {
sys_error (ERR_SEVERE, "Error opening file %s for output [projections_create]", filename);
return false;
}
+
+ time_t t = time(NULL);
+ tm* lt = localtime(&t);
+ m_year = lt->tm_year;
+ m_month = lt->tm_mon;
+ m_day = lt->tm_mday;
+ m_hour = lt->tm_hour;
+ m_minute = lt->tm_min;
+ m_second = lt->tm_sec;
+
if (! headerWrite (fs))
return false;
darray.setViewAngle (view_angle);
// darray.setNDet ( nDet);
- for (int i = 0; i < nDet; i++) {
+ for (unsigned int i = 0; i < nDet; i++) {
kfloat32 detval;
fs.readFloat32 (detval);
detval_ptr[i] = detval;
fs.writeFloat64 (view_angle);
fs.writeInt32 (nDet);
- for (int i = 0; i < nDet; i++) {
+ for (unsigned int i = 0; i < nDet; i++) {
kfloat32 detval = detval_ptr[i];
fs.writeFloat32 (detval);
}
}
+
+/* NAME
+ * Projections::reconstruct 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
+ */
+
+bool
+Projections::reconstruct (ImageFile& im, const char* const filterName, double filt_param, const char* const filterMethodName, const int zeropad, const char* const interpName, int interpFactor, const char* const backprojectName, const int trace) const
+{
+ double detInc = m_detInc;
+ int n_filteredProj = m_nDet * interpFactor;
+ double filteredProj [n_filteredProj]; // filtered projections
+
+#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;
+ n_filteredProj = (m_nDet - 1) * (zoom_factor + 1) + 1;
+ }
+#endif
+
+ double filterBW = 1. / detInc;
+ SignalFilter filter (filterName, filterMethodName, filterBW, m_detInc, m_nDet, filt_param, "spatial", zeropad, interpFactor);
+ filter.setTraceLevel(trace);
+
+ if (filter.fail()) {
+ sys_error (ERR_SEVERE, "%s [Projections::reconstruct]", filter.failMessage().c_str());
+ return false;
+ }
+
+ if (trace)
+ cout << "Reconstruct: filter="<<filterName<< ", interp="<<interpName<<", backproject="<<backprojectName<<endl;
+
+#if HAVE_SGP
+ int nVecFilter = filter.getNFilterPoints();
+ double plot_xaxis [nVecFilter]; // array for plotting
+
+ if (trace > TRACE_TEXT && nVecFilter > 0) {
+ int i;
+ double f;
+ double filterInc = filter.getFilterIncrement();
+ for (i = 0, f = filter.getFilterMin(); i < nVecFilter; i++, f += filterInc)
+ plot_xaxis[i] = f;
+
+ if (filter.getFilter()) {
+ SGPDriver sgpDriver ("Filter Function");
+ SGP sgp (sgpDriver);
+ EZPlot ezplot (sgp);
+
+ ezplot.ezset ("title Filter Response");
+ ezplot.addCurve (plot_xaxis, filter.getFilter(), nVecFilter);
+ ezplot.plot();
+ cio_put_str ("Press any key to continue");
+ cio_kb_getc ();
+ }
+ }
+ if (trace >= TRACE_TEXT) {
+ printf ("nview=%d, ndet=%d, det_start=%.4f, detInc=%.4f\n", m_nView, m_nDet, m_detStart, m_detInc);
+ }
+#endif //HAVE_SGP
+
+ Backprojector bj (*this, im, backprojectName, interpName, interpFactor);
+ if (bj.fail()) {
+ sys_error (ERR_SEVERE, "%s [Projections::reconstruct]", bj.failMessage().c_str());
+ return false;
+ }
+
+ for (int iview = 0; iview < m_nView; iview++) {
+ if (trace >= TRACE_TEXT)
+ printf ("Reconstructing view %d (last = %d)\n", iview, m_nView - 1);
+
+ const DetectorArray& darray = getDetectorArray (iview);
+ const DetectorValue* detval = darray.detValues();
+
+ filter.filterSignal (detval, filteredProj);
+
+
+
+#ifdef HAVE_BSPLINE_INTERP
+ if (interp_type == I_BSPLINE)
+ bspline (m_nDet, zoom_factor, spline_order, filteredProj, filteredProj);
+
+#ifdef HAVE_SGP
+ if (trace >= TRACE_PLOT && interp_type == I_BSPLINE) {
+ bspline (m_nDet, zoom_factor, spline_order, filteredProj, filteredProj);
+ ezplot_1d (filteredProj, n_filteredProj);
+ }
+#endif
+#endif
+
+ bj.BackprojectView (filteredProj, darray.viewAngle());
+
+#ifdef HAVE_SGP
+ if (trace >= TRACE_PLOT) {
+ SGPDriver sgpDriverProj ("Projection");
+ SGP sgpProj (sgpDriverProj);
+ EZPlot ezplotProj (sgpProj);
+
+ ezplotProj.ezset ("clear");
+ ezplotProj.ezset ("title Filtered Projection");
+ ezplotProj.ezset ("xticks major 5.");
+ ezplotProj.ezset ("xlabel ");
+ ezplotProj.ezset ("ylabel ");
+ ezplotProj.ezset ("yporigin .5.");
+ ezplotProj.ezset ("ylength .5.");
+ ezplotProj.ezset ("box.");
+ ezplotProj.ezset ("grid.");
+ ezplotProj.addCurve (plot_xaxis, detval, m_nDet);
+ ezplotProj.plot();
+ ezplotProj.ezset ("clear");
+ ezplotProj.ezset ("xticks major 5.");
+ ezplotProj.ezset ("xlabel ");
+ ezplotProj.ezset ("ylabel ");
+ ezplotProj.ezset ("ylength .5.");
+ ezplotProj.ezset ("box");
+ ezplotProj.ezset ("grid");
+ ezplotProj.addCurve (plot_xaxis, filteredProj, n_filteredProj);
+ ezplotProj.plot();
+
+ cout << "Do you want to exit with current pic (y/n)? " << flush;
+ char str[256];
+ fgets(str, sizeof(str), stdin);
+ if (tolower(str[0]) == 'y') {
+ break;
+ }
+ }
+#endif //HAVE_SGP
+ }
+
+ return true;
+}
+
projects / ctsim.git / blobdiff