1 /*****************************************************************************
4 ** Name: projections.cpp Projection data classes
5 ** Programmer: Kevin Rosenberg
6 ** Date Started: Aug 84
8 ** This is part of the CTSim program
9 ** Copyright (C) 1983-2000 Kevin Rosenberg
11 ** $Id: projections.cpp,v 1.15 2000/07/15 08:36:13 kevin Exp $
13 ** This program is free software; you can redistribute it and/or modify
14 ** it under the terms of the GNU General Public License (version 2) as
15 ** published by the Free Software Foundation.
17 ** This program is distributed in the hope that it will be useful,
18 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ** GNU General Public License for more details.
22 ** You should have received a copy of the GNU General Public License
23 ** along with this program; if not, write to the Free Software
24 ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 ******************************************************************************/
31 * Projections Constructor for projections matrix storage
34 * proj = projections_create (filename, nView, nDet)
35 * Projections& proj Allocated projections structure & matrix
36 * int nView Number of rotated view
37 * int nDet Number of detectors
41 Projections::Projections (const Scanner& scanner)
44 initFromScanner (scanner);
48 Projections::Projections (const int nView, const int nDet)
54 Projections::Projections (void)
60 Projections::~Projections (void)
67 Projections::init (const int nView, const int nDet)
75 Projections::initFromScanner (const Scanner& scanner)
78 init (scanner.nView(), scanner.nDet());
80 m_phmLen = scanner.phmLen();
81 m_rotInc = scanner.rotInc();
82 m_detInc = scanner.detInc();
84 m_detStart = -scanner.radius() + (scanner.detInc() / 2);
85 m_phmLen = scanner.phmLen();
89 Projections::setNView (int nView) // used by MPI to reduce # of views
99 Projections::newProjData (void)
102 sys_error(ERR_WARNING, "m_projData != NULL [newProjData]");
104 if (m_nView > 0 && m_nDet) {
105 m_projData = new DetectorArray* [m_nView];
107 for (int i = 0; i < m_nView; i++)
108 m_projData[i] = new DetectorArray (m_nDet);
114 * projections_free Free memory allocated to projections
117 * projections_free(proj)
118 * Projections& proj Projectionss to be deallocated
122 Projections::deleteProjData (void)
124 if (m_projData != NULL) {
125 for (int i = 0; i < m_nView; i++)
126 delete m_projData[i];
135 * Projections::headerWwrite Write data header for projections file
140 Projections::headerWrite (fnetorderstream& fs)
142 kuint16 _hsize = m_headerSize;
143 kuint16 _signature = m_signature;
144 kuint32 _nView = m_nView;
145 kuint32 _nDet = m_nDet;
146 kuint32 _geom = m_geometry;
147 kuint16 _remarksize = m_remark.length();
148 kuint16 _year = m_year;
149 kuint16 _month = m_month;
150 kuint16 _day = m_day;
151 kuint16 _hour = m_hour;
152 kuint16 _minute = m_minute;
153 kuint16 _second = m_second;
155 kfloat64 _calcTime = m_calcTime;
156 kfloat64 _rotStart = m_rotStart;
157 kfloat64 _rotInc = m_rotInc;
158 kfloat64 _detStart = m_detStart;
159 kfloat64 _detInc = m_detInc;
160 kfloat64 _phmLen = m_phmLen;
166 fs.writeInt16 (_hsize);
167 fs.writeInt16 (_signature);
168 fs.writeInt32 (_nView);
169 fs.writeInt32 (_nDet);
170 fs.writeInt32 (_geom);
171 fs.writeFloat64 (_calcTime);
172 fs.writeFloat64 (_rotStart);
173 fs.writeFloat64 (_rotInc);
174 fs.writeFloat64 (_detStart);
175 fs.writeFloat64 (_detInc);
176 fs.writeFloat64 (_phmLen);
177 fs.writeInt16 (_year);
178 fs.writeInt16 (_month);
179 fs.writeInt16 (_day);
180 fs.writeInt16 (_hour);
181 fs.writeInt16 (_minute);
182 fs.writeInt16 (_second);
183 fs.writeInt16 (_remarksize);
184 fs.write (m_remark.c_str(), _remarksize);
186 m_headerSize = fs.tellp();
187 _hsize = m_headerSize;
189 fs.writeInt16 (_hsize);
197 * projections_read_header Read data header for projections file
201 Projections::headerRead (fnetorderstream& fs)
203 kuint16 _hsize, _signature, _year, _month, _day, _hour, _minute, _second, _remarksize = 0;
204 kuint32 _nView, _nDet, _geom;
205 kfloat64 _calcTime, _rotStart, _rotInc, _detStart, _detInc, _phmLen;
211 fs.readInt16 (_hsize);
212 fs.readInt16 (_signature);
213 fs.readInt32 (_nView);
214 fs.readInt32 (_nDet);
215 fs.readInt32 (_geom);
216 fs.readFloat64 (_calcTime);
217 fs.readFloat64 (_rotStart);
218 fs.readFloat64 (_rotInc);
219 fs.readFloat64 (_detStart);
220 fs.readFloat64 (_detInc);
221 fs.readFloat64 (_phmLen);
222 fs.readInt16 (_year);
223 fs.readInt16 (_month);
225 fs.readInt16 (_hour);
226 fs.readInt16 (_minute);
227 fs.readInt16 (_second);
228 fs.readInt16 (_remarksize);
231 sys_error (ERR_SEVERE, "Error reading header information , _remarksize=%d [projections_read_header]", _remarksize);
235 if (_signature != m_signature) {
236 sys_error (ERR_SEVERE, "File %s does not have a valid projection file signature", m_filename.c_str());
240 char remarkStorage[_remarksize+1];
241 fs.read (remarkStorage, _remarksize);
243 sys_error (ERR_SEVERE, "Error reading remark, _remarksize = %d", _remarksize);
246 remarkStorage[_remarksize] = 0;
247 m_remark = remarkStorage;
249 off_t _hsizeread = fs.tellg();
250 if (!fs || _hsizeread != _hsize) {
251 sys_error (ERR_WARNING, "File header size read %ld != file header size stored %ld [read_projections_header]\n_remarksize=%ld", (long int) _hsizeread, _hsize, _remarksize);
255 m_headerSize = _hsize;
259 m_calcTime = _calcTime;
260 m_rotStart = _rotStart;
262 m_detStart = _detStart;
272 m_label.setLabelType (Array2dFileLabel::L_HISTORY);
273 m_label.setLabelString (m_remark);
274 m_label.setCalcTime (m_calcTime);
275 m_label.setDateTime (m_year, m_month, m_day, m_hour, m_minute, m_second);
281 Projections::read (const char* filename)
283 frnetorderstream fileRead (filename, ios::in | ios::binary);
284 m_filename = filename;
289 if (! headerRead (fileRead))
295 for (int i = 0; i < m_nView; i++) {
296 if (! detarrayRead (fileRead, *m_projData[i], i))
306 Projections::write (const char* filename)
308 frnetorderstream fs (filename, ios::out | ios::binary | ios::trunc | ios::ate);
309 m_filename = filename;
311 sys_error (ERR_SEVERE, "Error opening file %s for output [projections_create]", filename);
315 time_t t = time(NULL);
316 tm* lt = localtime(&t);
317 m_year = lt->tm_year;
318 m_month = lt->tm_mon;
320 m_hour = lt->tm_hour;
321 m_minute = lt->tm_min;
322 m_second = lt->tm_sec;
324 if (! headerWrite (fs))
327 if (m_projData != NULL) {
328 for (int i = 0; i < m_nView; i++) {
329 if (! detarrayWrite (fs, *m_projData[i], i))
342 * detarrayRead Read a Detector Array structure from the disk
345 * detarrayRead (proj, darray, view_num)
346 * DETARRAY *darray Detector array storage location to be filled
347 * int view_num View number to read
351 Projections::detarrayRead (fnetorderstream& fs, DetectorArray& darray, const int iview)
353 const int detval_bytes = darray.nDet() * sizeof(kfloat32);
354 const int detheader_bytes = sizeof(kfloat64) /* view_angle */ + sizeof(kint32) /* nDet */;
355 const int view_bytes = detheader_bytes + detval_bytes;
356 const off_t start_data = m_headerSize + (iview * view_bytes);
357 DetectorValue* detval_ptr = darray.detValues();
361 fs.seekg (start_data);
363 fs.readFloat64 (view_angle);
365 darray.setViewAngle (view_angle);
366 // darray.setNDet ( nDet);
368 for (unsigned int i = 0; i < nDet; i++) {
370 fs.readFloat32 (detval);
371 detval_ptr[i] = detval;
381 * detarrayWrite Write detector array data to the disk
384 * detarrayWrite (darray, view_num)
385 * DETARRAY *darray Detector array data to be written
386 * int view_num View number to write
389 * This routine writes the detarray data from the disk sequentially to
390 * the file that was opened with open_projections(). Data is written in
395 Projections::detarrayWrite (fnetorderstream& fs, const DetectorArray& darray, const int iview)
397 const int detval_bytes = darray.nDet() * sizeof(float);
398 const int detheader_bytes = sizeof(kfloat64) /* view_angle */ + sizeof(kint32) /* nDet */;
399 const int view_bytes = detheader_bytes + detval_bytes;
400 const off_t start_data = m_headerSize + (iview * view_bytes);
401 const DetectorValue* const detval_ptr = darray.detValues();
402 kfloat64 view_angle = darray.viewAngle();
403 kuint32 nDet = darray.nDet();
405 fs.seekp (start_data);
407 sys_error (ERR_SEVERE, "Error seeking detectory array [detarrayWrite]");
411 fs.writeFloat64 (view_angle);
412 fs.writeInt32 (nDet);
414 for (unsigned int i = 0; i < nDet; i++) {
415 kfloat32 detval = detval_ptr[i];
416 fs.writeFloat32 (detval);
426 * prt_projections Print projections data
429 * prt_projections (proj)
430 * Projections& proj Projection data to be printed
434 Projections::printProjectionData (void)
436 printf("Projections Print\n\n");
437 printf("Description: %s\n", m_remark.c_str());
438 printf("nView = %d nDet = %d\n", m_nView, m_nDet);
439 printf("rotStart = %8.4f rotInc = %8.4f\n", m_rotStart, m_rotInc);
440 printf("detStart = %8.4f detInc = %8.4f\n", m_detStart, m_detInc);
442 if (m_projData != NULL) {
443 for (int ir = 0; ir < m_nView; ir++) {
444 DetectorValue* detval = m_projData[ir]->detValues();
445 for (int id = 0; id < m_projData[ir]->nDet(); id++)
446 printf("%8.4f ", detval[id]);
453 Projections::printScanInfo (void) const
455 printf ("Number of detectors: %d\n", m_nDet);
456 printf (" Number of views: %d\n", m_nView);
457 printf (" Remark: %s\n", m_remark.c_str());
458 printf (" phmLen: %f\n", m_phmLen);
459 printf (" detStart: %f\n", m_detStart);
460 printf (" detInc: %f\n", m_detInc);
461 printf (" rotStart: %f\n", m_rotStart);
462 printf (" rotInc: %f\n", m_rotInc);
468 * Projections::reconstruct Reconstruct Image from Projections
471 * im = proj.reconstruct (im, filt_type, filt_param, interp_type)
472 * IMAGE *im Output image
473 * int filt_type Type of convolution filter to use
474 * double filt_param Filter specific parameter
475 * Currently, used only with Hamming filters
476 * int interp_type Type of interpolation method to use
480 * Calculate one-dimensional filter in spatial domain
481 * Allocate & clear (zero) the 2d output image array
482 * For each projection view
483 * Convolve raysum array with filter
484 * Backproject raysums and add (summate) to image array
489 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
491 double detInc = m_detInc;
492 int n_filteredProj = m_nDet * interpFactor;
493 double filteredProj [n_filteredProj]; // filtered projections
495 #ifdef HAVE_BSPLINE_INTERP
496 int spline_order = 0, zoom_factor = 0;
497 if (interp_type == I_BSPLINE) {
498 zoom_factor = interpFactor;
501 n_filteredProj = (m_nDet - 1) * (zoom_factor + 1) + 1;
505 double filterBW = 1. / detInc;
506 SignalFilter filter (filterName, filterMethodName, filterBW, m_detInc, m_nDet, filt_param, "spatial", zeropad, interpFactor);
507 filter.setTraceLevel(trace);
510 sys_error (ERR_SEVERE, "%s [Projections::reconstruct]", filter.failMessage().c_str());
515 cout << "Reconstruct: filter="<<filterName<< ", interp="<<interpName<<", backproject="<<backprojectName<<endl;
519 int nVecFilter = filter.getNFilterPoints();
520 double plot_xaxis [nVecFilter]; // array for plotting
522 if (trace > TRACE_TEXT && nVecFilter > 0) {
525 double filterInc = filter.getFilterIncrement();
526 for (i = 0, f = filter.getFilterMin(); i < nVecFilter; i++, f += filterInc)
529 if (filter.getFilter()) {
530 gid = ezplot (plot_xaxis, filter.getFilter(), nVecFilter);
531 cio_put_str ("Press any key to continue");
536 if (trace >= TRACE_TEXT) {
537 printf ("nview=%d, ndet=%d, det_start=%.4f, detInc=%.4f\n", m_nView, m_nDet, m_detStart, m_detInc);
541 Backprojector bj (*this, im, backprojectName, interpName, interpFactor);
543 sys_error (ERR_SEVERE, "%s [Projections::reconstruct]", bj.failMessage().c_str());
547 for (int iview = 0; iview < m_nView; iview++) {
548 if (trace >= TRACE_TEXT)
549 printf ("Reconstructing view %d (last = %d)\n", iview, m_nView - 1);
551 const DetectorArray& darray = getDetectorArray (iview);
552 const DetectorValue* detval = darray.detValues();
554 filter.filterSignal (detval, filteredProj);
557 if (trace >= TRACE_PLOT) {
559 ezset ("xticks major 5.");
562 ezset ("xlength .5.");
565 ezset ("ufinish yes.");
566 ezplot (detval, plot_xaxis, m_nDet);
568 ezset ("xticks major 5.");
571 ezset ("ustart yes.");
572 ezset ("xporigin .5.");
573 ezset ("xlength .5.");
577 gid = ezplot (filteredProj, plot_xaxis, n_filteredProj);
581 #ifdef HAVE_BSPLINE_INTERP
582 if (interp_type == I_BSPLINE)
583 bspline (m_nDet, zoom_factor, spline_order, filteredProj, filteredProj);
586 if (trace >= TRACE_PLOT && interp_type == I_BSPLINE) {
587 bspline (m_nDet, zoom_factor, spline_order, filteredProj, filteredProj);
588 ezplot_1d (filteredProj, n_filteredProj);
593 bj.BackprojectView (filteredProj, darray.viewAngle());
596 if (trace >= TRACE_PLOT) {
598 printf ("Do you want to exit with current pic (y/n) -- ");
599 fgets(str, sizeof(str), stdin);
600 sgp2_close (sgp2_get_active_win());
601 if (tolower(str[0]) == 'y') {