1 /*****************************************************************************
5 ** Purpose: Imagefile classes
6 ** Programmer: Kevin Rosenberg
7 ** Date Started: June 2000
9 ** This is part of the CTSim program
10 ** Copyright (C) 1983-2000 Kevin Rosenberg
12 ** $Id: imagefile.cpp,v 1.20 2000/12/16 06:12:47 kevin Exp $
14 ** This program is free software; you can redistribute it and/or modify
15 ** it under the terms of the GNU General Public License (version 2) as
16 ** published by the Free Software Foundation.
18 ** This program is distributed in the hope that it will be useful,
19 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ** GNU General Public License for more details.
23 ** You should have received a copy of the GNU General Public License
24 ** along with this program; if not, write to the Free Software
25 ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 ******************************************************************************/
31 F32Image::F32Image (int nx, int ny)
\r
32 : Array2dFile (nx, ny, sizeof(kfloat32), Array2dFile::PIXEL_FLOAT32)
\r
36 F32Image::F32Image (void)
\r
39 setPixelFormat (Array2dFile::PIXEL_FLOAT32);
\r
40 setPixelSize (sizeof(kfloat32));
\r
43 F64Image::F64Image (int nx, int ny)
\r
44 : Array2dFile (nx, ny, sizeof(kfloat64), Array2dFile::PIXEL_FLOAT64)
\r
48 F64Image::F64Image (void)
\r
51 setPixelFormat (PIXEL_FLOAT64);
\r
52 setPixelSize (sizeof(kfloat64));
\r
56 ImageFile::filterResponse (const char* const domainName, double bw, const char* const filterName, double filt_param)
58 int hx = (m_nx - 1) / 2;
59 int hy = (m_ny - 1) / 2;
60 ImageFileArray v = getArray();
61 SignalFilter filter (filterName, domainName, bw, filt_param);
63 for (int i = -hx; i <= hx; i++) {
64 for (int j = -hy; j <= hy; j++) {
65 double r = sqrt (i * i + j * j);
67 v[i+hx][j+hy] = filter.response (r);
73 ImageFile::display (void) const
77 getMinMax (pmin, pmax);
79 return (displayScaling (1, pmin, pmax));
83 ImageFile::displayScaling (const int scale, const ImageFileValue pmin, const ImageFileValue pmax) const
87 ImageFileArrayConst v = getArray();
88 if (v == NULL || nx == 0 || ny == 0)
92 int* pPens = new int [nx * ny * scale * scale ];
94 double view_scale = 255 / (pmax - pmin);
95 int id_X11 = g2_open_X11 (nx * scale, ny * scale);
97 for (int i = 0; i < 256; i++) {
98 double cval = i / 255.;
99 grayscale[i] = g2_ink (id_X11, cval, cval, cval);
102 for (int iy = ny - 1; iy >= 0; iy--) {
103 int iRowPos = ((ny - 1 - iy) * scale) * (nx * scale);
104 for (int ix = 0; ix < nx; ix++) {
105 int cval = static_cast<int>((v[ix][iy] - pmin) * view_scale);
110 for (int sy = 0; sy < scale; sy++)
111 for (int sx = 0; sx < scale; sx++)
112 pPens[iRowPos+(sy * nx * scale)+(sx + (ix * scale))] = grayscale[cval];
116 g2_image (id_X11, 0., 0., nx * scale, ny * scale, pPens);
127 // ImageFile::comparativeStatistics Calculate comparative stats
130 // d Normalized root mean squared distance measure
131 // r Normalized mean absolute distance measure
132 // e Worst case distance measure
135 // G.T. Herman, Image Reconstruction From Projections, 1980
138 ImageFile::comparativeStatistics (const ImageFile& imComp, double& d, double& r, double& e) const
140 if (imComp.nx() != m_nx && imComp.ny() != m_ny) {
141 sys_error (ERR_WARNING, "Image sizes differ [ImageFile::comparativeStatistics]");
144 ImageFileArrayConst v = getArray();
145 if (v == NULL || m_nx == 0 || m_ny == 0)
148 ImageFileArrayConst vComp = imComp.getArray();
151 for (unsigned int ix = 0; ix < m_nx; ix++) {
152 for (unsigned int iy = 0; iy < m_ny; iy++) {
156 myMean /= (m_nx * m_ny);
158 double sqErrorSum = 0.;
159 double absErrorSum = 0.;
160 double sqDiffFromMeanSum = 0.;
161 double absValueSum = 0.;
162 for (unsigned int ix2 = 0; ix2 < m_nx; ix2++) {
163 for (unsigned int iy = 0; iy < m_ny; iy++) {
164 double diff = v[ix2][iy] - vComp[ix2][iy];
165 sqErrorSum += diff * diff;
166 absErrorSum += fabs(diff);
167 double diffFromMean = v[ix2][iy] - myMean;
168 sqDiffFromMeanSum += diffFromMean * diffFromMean;
169 absValueSum += fabs(v[ix2][iy]);
173 d = sqrt (sqErrorSum / sqDiffFromMeanSum);
174 r = absErrorSum / absValueSum;
179 for (int ix3 = 0; ix3 < hx; ix3++) {
180 for (int iy = 0; iy < hy; iy++) {
181 double avgPixel = 0.25 * (v[2*ix3][2*iy] + v[2*ix3+1][2*iy] + v[2*ix3][2*iy+1] + v[2*ix3+1][2*iy+1]);
182 double avgPixelComp = 0.25 * (vComp[2*ix3][2*iy] + vComp[2*ix3+1][2*iy] + vComp[2*ix3][2*iy+1] + vComp[2*ix3+1][2*iy+1]);
183 double error = fabs (avgPixel - avgPixelComp);
196 ImageFile::printComparativeStatistics (const ImageFile& imComp, std::ostream& os) const
200 if (comparativeStatistics (imComp, d, r, e)) {
201 os << " Normalized root mean squared distance (d): " << d << std::endl;
202 os << " Normalized mean absolute distance (r): " << r << std::endl;
203 os << "Worst case distance (2x2 pixel average) (e): " << e << std::endl;
211 ImageFile::printStatistics (std::ostream& os) const
213 double min, max, mean, mode, median, stddev;
215 statistics (min, max, mean, mode, median, stddev);
217 os << " min: " << min << std::endl;
218 os << " max: " << max << std::endl;
219 os << " mean: " << mean << std::endl;
220 os << " mode: " << mode << std::endl;
221 os << "median: " << median << std::endl;
222 os << "stddev: " << stddev << std::endl;
227 ImageFile::statistics (double& min, double& max, double& mean, double& mode, double& median, double& stddev) const
231 ImageFileArrayConst v = getArray();
233 if (v == NULL || nx == 0 || ny == 0)
239 for (int ix = 0; ix < nx; ix++) {
240 for (int iy = 0; iy < ny; iy++) {
250 static const int nbin = 1024;
251 int hist[ nbin ] = {0};
252 double spread = max - min;
255 for (int ix4 = 0; ix4 < nx; ix4++) {
256 for (int iy = 0; iy < ny; iy++) {
257 int b = static_cast<int>((((v[ix4][iy] - min) / spread) * (nbin - 1)) + 0.5);
259 double diff = (v[ix4][iy] - mean);
260 stddev += diff * diff;
263 stddev = sqrt(stddev / (nx * ny));
265 int max_binindex = 0;
267 for (int ibin = 0; ibin < nbin; ibin++) {
268 if (hist[ibin] > max_bin) {
269 max_bin = hist[ibin];
274 mode = (max_binindex * spread / (nbin - 1)) + min;
276 int nPixels = nx * ny;
277 std::list<double> vecImage;
278 for (int ix5 = 0; ix5 < nx; ix5++)
279 for (int iy = 0; iy < ny; iy++)
280 vecImage.push_front (v[ix5][iy]);
282 std::list<double>::const_iterator iter = vecImage.begin();
283 for (int i = 0; i < (nPixels / 2) - 1; i++)
284 iter++; // Advance iterator to (nPixels / 2) - 1;
286 if (nPixels % 2) { // Odd
290 median = (*iter++ + *iter) / 2;
295 ImageFile::getMinMax (double& min, double& max) const
299 ImageFileArrayConst v = getArray();
301 if (v == NULL || nx == 0 || ny == 0)
306 for (int ix = 0; ix < nx; ix++) {
307 for (int iy = 0; iy < ny; iy++) {
317 ImageFile::writeImagePGM (const char *outfile, int nxcell, int nycell, double densmin, double densmax)
322 ImageFileArray v = getArray();
324 unsigned char* rowp = new unsigned char [nx * nxcell];
326 if ((fp = fopen (outfile, "wb")) == NULL)
330 fprintf(fp, "%d %d\n", nx, ny);
331 fprintf(fp, "255\n");
333 for (int irow = ny - 1; irow >= 0; irow--) {
334 for (int icol = 0; icol < nx; icol++) {
335 int pos = icol * nxcell;
336 double dens = (v[icol][irow] - densmin) / (densmax - densmin);
337 dens = clamp (dens, 0., 1.);
338 for (int p = pos; p < pos + nxcell; p++) {
339 rowp[p] = static_cast<unsigned int> (dens * 255.);
342 for (int ir = 0; ir < nycell; ir++) {
343 for (int ic = 0; ic < nx * nxcell; ic++)
344 fputc( rowp[ic], fp );
353 ImageFile::writeImagePGMASCII (const char *outfile, int nxcell, int nycell, double densmin, double densmax)
358 ImageFileArray v = getArray();
360 unsigned char* rowp = new unsigned char [nx * nxcell];
362 if ((fp = fopen (outfile, "wb")) == NULL)
366 fprintf(fp, "%d %d\n", nx, ny);
367 fprintf(fp, "255\n");
369 for (int irow = ny - 1; irow >= 0; irow--) {
370 for (int icol = 0; icol < nx; icol++) {
371 int pos = icol * nxcell;
372 double dens = (v[icol][irow] - densmin) / (densmax - densmin);
373 dens = clamp (dens, 0., 1.);
374 for (int p = pos; p < pos + nxcell; p++) {
375 rowp[p] = static_cast<unsigned int> (dens * 255.);
378 for (int ir = 0; ir < nycell; ir++) {
379 for (int ic = 0; ic < nx * nxcell; ic++)
380 fprintf(fp, "%d ", rowp[ic]);
392 ImageFile::writeImagePNG (const char *outfile, int bitdepth, int nxcell, int nycell, double densmin, double densmax)
397 double max_out_level = (1 << bitdepth) - 1;
400 ImageFileArray v = getArray();
402 unsigned char* rowp = new unsigned char [nx * nxcell * (bitdepth / 8)];
404 if ((fp = fopen (outfile, "wb")) == NULL)
407 png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
411 info_ptr = png_create_info_struct(png_ptr);
413 png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
418 if (setjmp(png_ptr->jmpbuf)) {
419 png_destroy_write_struct(&png_ptr, &info_ptr);
424 png_init_io(png_ptr, fp);
426 png_set_IHDR(png_ptr, info_ptr, nx * nxcell, ny * nycell, bitdepth, PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_DEFAULT);
428 png_write_info(png_ptr, info_ptr);
429 for (int irow = ny - 1; irow >= 0; irow--) {
430 png_bytep row_pointer = rowp;
432 for (int icol = 0; icol < nx; icol++) {
433 int pos = icol * nxcell;
434 double dens = (v[icol][irow] - densmin) / (densmax - densmin);
435 dens = clamp (dens, 0., 1.);
436 unsigned int outval = static_cast<unsigned int> (dens * max_out_level);
438 for (int p = pos; p < pos + nxcell; p++) {
443 rowp[rowpos] = (outval >> 8) & 0xFF;
444 rowp[rowpos+1] = (outval & 0xFF);
448 for (int ir = 0; ir < nycell; ir++)
449 png_write_rows (png_ptr, &row_pointer, 1);
452 png_write_end(png_ptr, info_ptr);
453 png_destroy_write_struct(&png_ptr, &info_ptr);
462 static const int N_GRAYSCALE=256;
465 ImageFile::writeImageGIF (const char *outfile, int nxcell, int nycell, double densmin, double densmax)
469 int gs_indices[N_GRAYSCALE];
472 ImageFileArray v = getArray();
474 unsigned char rowp [nx * nxcell];
478 gif = gdImageCreate(nx * nxcell, ny * nycell);
479 for (int i = 0; i < N_GRAYSCALE; i++)
480 gs_indices[i] = gdImageColorAllocate(gif, i, i, i);
482 int lastrow = ny * nycell - 1;
483 for (int irow = 0; irow < ny; irow++) {
484 int rpos = irow * nycell;
485 for (int ir = rpos; ir < rpos + nycell; ir++) {
486 for (int icol = 0; icol < nx; icol++) {
487 int cpos = icol * nxcell;
488 double dens = (v[icol][irow] - densmin) / (densmax - densmin);
489 dens = clamp(dens, 0., 1.);
490 for (int ic = cpos; ic < cpos + nxcell; ic++) {
491 rowp[ic] = (unsigned int) (dens * (double) (N_GRAYSCALE - 1));
492 gdImageSetPixel(gif, ic, lastrow - ir, gs_indices[rowp[ic]]);
498 if ((out = fopen(outfile,"w")) == NULL) {
499 sys_error(ERR_FATAL, "Error opening output file %s for writing", outfile);