r182: *** empty log message ***

[ctsim.git] / libctsim / imagefile.cpp

diff --git a/libctsim/imagefile.cpp b/libctsim/imagefile.cpp
index 9ae326f73ed6de8e3bd1038ef736c645d7c7b5b5..3f7c0beff717a84bafe3f588816dfc50d29bf0db 100644 (file)
--- a/libctsim/imagefile.cpp
+++ b/libctsim/imagefile.cpp
@@ -9,7 +9,7 @@
 **  This is part of the CTSim program
 **  Copyright (C) 1983-2000 Kevin Rosenberg
 **
-**  $Id: imagefile.cpp,v 1.7 2000/07/11 10:32:44 kevin Exp $
+**  $Id: imagefile.cpp,v 1.10 2000/08/22 16:49:56 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
@@ -47,29 +47,30 @@ ImageFile::filterResponse (const char* const domainName, double bw, const char*
 }
 
 int
-ImageFile::display (void)
+ImageFile::display (void) const
 {
     double pmin, pmax;
 
-    //    getPixelValueRange (pmin, pmax);
+    getMinMax (pmin, pmax);
 
     return (displayScaling (1, pmin, pmax));
 }
 
 int 
-ImageFile::displayScaling (const int scale, const ImageFileValue pmin, const ImageFileValue pmax)
+ImageFile::displayScaling (const int scale, const ImageFileValue pmin, const ImageFileValue pmax) const
 {
-    int grayscale[256];
     int nx = m_nx;
     int ny = m_ny;
-    ImageFileArray v = getArray();
+    ImageFileArrayConst v = getArray();
+    if (v == NULL || nx == 0 || ny == 0)
+      return 0;
 
 #if HAVE_G2_H
     int pens [nx * ny * scale * scale ];
 
     double view_scale = 255 / (pmax - pmin);
     int id_X11 = g2_open_X11 (nx * scale, ny * scale);
-
+    int grayscale[256];
     for (int i = 0; i < 256; i++) {
        double cval = i / 255.;
        grayscale[i] = g2_ink (id_X11, cval, cval, cval);
@@ -113,11 +114,14 @@ ImageFile::comparativeStatistics (const ImageFile& imComp, double& d, double& r,
        return false;
     }
     ImageFileArrayConst v = getArray();
+    if (v == NULL || m_nx == 0 || m_ny == 0)
+      return false;
+
     ImageFileArrayConst vComp = imComp.getArray();
 
     double myMean = 0.;
-    for (int ix = 0; ix < m_nx; ix++) {
-       for (int iy = 0; iy < m_ny; iy++) {
+    for (unsigned int ix = 0; ix < m_nx; ix++) {
+       for (unsigned int iy = 0; iy < m_ny; iy++) {
            myMean += v[ix][iy];
        }
     }
@@ -127,8 +131,8 @@ ImageFile::comparativeStatistics (const ImageFile& imComp, double& d, double& r,
     double absErrorSum = 0.;
     double sqDiffFromMeanSum = 0.;
     double absValueSum = 0.;
-    for (int ix = 0; ix < m_nx; ix++) {
-       for (int iy = 0; iy < m_ny; iy++) {
+    for (unsigned int ix = 0; ix < m_nx; ix++) {
+       for (unsigned int iy = 0; iy < m_ny; iy++) {
            double diff = v[ix][iy] - vComp[ix][iy];
            sqErrorSum += diff * diff;
            absErrorSum += fabs(diff);
@@ -169,7 +173,9 @@ ImageFile::printComparativeStatistics (const ImageFile& imComp, ostream& os) con
     os << "  Normalized root mean squared distance (d): " << d << endl;
     os << "      Normalized mean absolute distance (r): " << r << endl;
     os << "Worst case distance (2x2 pixel average) (e): " << e << endl;
+    return true;
   }
+  return false;
 }
 
 
@@ -196,6 +202,9 @@ ImageFile::statistics (double& min, double& max, double& mean, double& mode, dou
     int ny = m_ny;
     ImageFileArrayConst v = getArray();
     
+    if (v == NULL || nx == 0 || ny == 0)
+      return;
+
     mean = 0;
     min = v[0][0];
     max = v[0][0];
@@ -210,7 +219,7 @@ ImageFile::statistics (double& min, double& max, double& mean, double& mode, dou
     }
     mean /= (nx * ny);
 
-    static const int nbin = 256;
+    static const int nbin = 1024;
     int hist[ nbin ] = {0};
     double spread = max - min;
     mode = 0;
@@ -235,11 +244,47 @@ ImageFile::statistics (double& min, double& max, double& mean, double& mode, dou
     }
 
     mode = (max_binindex * spread / (nbin - 1)) + min;
-      
-    median = 0.;
+
+    int nPixels = nx * ny;
+    slist<double> vecImage;
+    for (int ix = 0; ix < nx; ix++)
+      for (int iy = 0; iy < ny; iy++)
+       vecImage.push_front (v[ix][iy]);
+    vecImage.sort();
+    slist<double>::const_iterator iter = vecImage.begin();
+    for (int i = 0; i < (nPixels / 2) - 1; i++)
+      iter++; // Advance iterator to (nPixels / 2) - 1;
+
+    if (nPixels % 2) {  // Odd
+      iter++;
+      median = *iter;
+    } else                // Even
+      median = (*iter++ + *iter) / 2;
 }
 
 
+void
+ImageFile::getMinMax (double& min, double& max) const
+{
+    int nx = m_nx;
+    int ny = m_ny;
+    ImageFileArrayConst v = getArray();
+    
+    if (v == NULL || nx == 0 || ny == 0)
+      return;
+
+    min = v[0][0];
+    max = v[0][0];
+    for (int ix = 0; ix < nx; ix++) {
+      for (int iy = 0; iy < ny; iy++) {
+       if (v[ix][iy] > max)
+         max = v[ix][iy];
+       if (v[ix][iy] < min)
+         min = v[ix][iy];
+      }
+    }
+}
+
 void 
 ImageFile::writeImagePGM (const char *outfile, int nxcell, int nycell, double densmin, double densmax)
 {