OverlapStatistics.cpp

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#include "OverlapStatistics.h"

#include <cfloat>
#include <iomanip>

#include "Brick.h"
#include "Cube.h"
#include "FileName.h"
#include "IException.h"
#include "MultivariateStatistics.h"
#include "Progress.h"
#include "Projection.h"
#include "ProjectionFactory.h"
#include "PvlObject.h"

using namespace std;
namespace Isis {

  OverlapStatistics::OverlapStatistics(Isis::Cube &x, Isis::Cube &y,
                                       QString progressMsg, double sampPercent) {
    // Test to ensure sampling percent in bound
    if (sampPercent <= 0.0 || sampPercent > 100.0) {
      string msg = "The sampling percent must be a decimal (0.0, 100.0]";
      throw IException(IException::Programmer, msg, _FILEINFO_);
    }

    p_sampPercent = sampPercent;

    // Extract filenames and band number from cubes
    p_xFile = x.fileName();
    p_yFile = y.fileName();

    // Make sure number of bands match
    if (x.bandCount() != y.bandCount()) {
      QString msg = "Number of bands do not match between cubes [" +
                   p_xFile.name() + "] and [" + p_yFile.name() + "]";
      throw IException(IException::User, msg, _FILEINFO_);
    }
    p_bands = x.bandCount();
    p_stats.resize(p_bands);

    //Create projection from each cube
    Projection *projX = x.projection();
    Projection *projY = y.projection();

    // Test to make sure projection parameters match
    if (*projX != *projY) {
      QString msg = "Mapping groups do not match between cubes [" +
                   p_xFile.name() + "] and [" + p_yFile.name() + "]";
      throw IException(IException::Programmer, msg, _FILEINFO_);
    }

    // Figure out the x/y range for both images to find the overlap
    double Xmin1 = projX->ToProjectionX(0.5);
    double Ymax1 = projX->ToProjectionY(0.5);
    double Xmax1 = projX->ToProjectionX(x.sampleCount() + 0.5);
    double Ymin1 = projX->ToProjectionY(x.lineCount() + 0.5);

    double Xmin2 = projY->ToProjectionX(0.5);
    double Ymax2 = projY->ToProjectionY(0.5);
    double Xmax2 = projY->ToProjectionX(y.sampleCount() + 0.5);
    double Ymin2 = projY->ToProjectionY(y.lineCount() + 0.5);

    // Find overlap
    if ((Xmin1 < Xmax2) && (Xmax1 > Xmin2) && (Ymin1 < Ymax2) && (Ymax1 > Ymin2)) {
      double minX = Xmin1 > Xmin2 ? Xmin1 : Xmin2;
      double minY = Ymin1 > Ymin2 ? Ymin1 : Ymin2;
      double maxX = Xmax1 < Xmax2 ? Xmax1 : Xmax2;
      double maxY = Ymax1 < Ymax2 ? Ymax1 : Ymax2;

      // Find Sample range of the overlap
      p_minSampX = (int)(projX->ToWorldX(minX) + 0.5);
      p_maxSampX = (int)(projX->ToWorldX(maxX) + 0.5);
      p_minSampY = (int)(projY->ToWorldX(minX) + 0.5);
      p_maxSampY = (int)(projY->ToWorldX(maxX) + 0.5);
      p_sampRange = p_maxSampX - p_minSampX + 1;

      // Test to see if there was only sub-pixel overlap
      if (p_sampRange <= 0) return;

      // Find Line range of overlap
      p_minLineX = (int)(projX->ToWorldY(maxY) + 0.5);
      p_maxLineX = (int)(projX->ToWorldY(minY) + 0.5);
      p_minLineY = (int)(projY->ToWorldY(maxY) + 0.5);
      p_maxLineY = (int)(projY->ToWorldY(minY) + 0.5);
      p_lineRange = p_maxLineX - p_minLineX + 1;

      // Print percent processed
      Progress progress;
      progress.SetText(progressMsg);

      int linc = (int)(100.0 / sampPercent + 0.5); // Calculate our line increment

      // Define the maximum number of steps to be our line range divided by the
      // line increment, but if they do not divide evenly, then because of
      // rounding, we need to do an additional step for each band
      int maxSteps = (int)(p_lineRange / linc + 0.5);

      if (p_lineRange % linc != 0) maxSteps += 1;
      maxSteps *= p_bands;


      progress.SetMaximumSteps(maxSteps);
      progress.CheckStatus();

      // Collect and store off the overlap statistics
      for (int band = 1; band <= p_bands; band++) {
        Brick b1(p_sampRange, 1, 1, x.pixelType());
        Brick b2(p_sampRange, 1, 1, y.pixelType());

        int i = 0;
        while(i < p_lineRange) {
          b1.SetBasePosition(p_minSampX, (i + p_minLineX), band);
          b2.SetBasePosition(p_minSampY, (i + p_minLineY), band);
          x.read(b1);
          y.read(b2);
          p_stats[band-1].AddData(b1.DoubleBuffer(), b2.DoubleBuffer(), p_sampRange);

          // Make sure we consider the last line
          if (i + linc > p_lineRange - 1 && i != p_lineRange - 1) {
            i = p_lineRange - 1;
            progress.AddSteps(1);
          }
          else i += linc; // Increment the current line by our incrementer

          progress.CheckStatus();
        }
      }
    }
  }

  bool OverlapStatistics::HasOverlap() const {
    for (int b = 0; b < p_bands; b++) {
      if (p_stats[b].ValidPixels() > 0) return true;
    }
    return false;
  }


  PvlObject OverlapStatistics::toPvl() const {
    // Output the private variables
    try {
      PvlObject o("OverlapStatistics");
      PvlGroup gX("File1");
      PvlKeyword stsX("StartSample", toString(StartSampleX()));
      PvlKeyword ensX("EndSample", toString(EndSampleX()));
      PvlKeyword stlX("StartLine", toString(StartLineX()));
      PvlKeyword enlX("EndLine", toString(EndLineX()));
      PvlKeyword avgX("Average");
      PvlKeyword stdX("StandardDeviation");
      PvlKeyword varX("Variance");
      for (int band = 1; band <= Bands(); band++) {
        if (HasOverlap(band)) {
          avgX += toString(GetMStats(band).X().Average());
          stdX += toString(GetMStats(band).X().StandardDeviation());
          varX += toString(GetMStats(band).X().Variance());
        }
      }
      gX += stsX;
      gX += ensX;
      gX += stlX;
      gX += enlX;
      gX += avgX;
      gX += stdX;
      gX += varX;

      PvlGroup gY("File2");
      PvlKeyword stsY("StartSample", toString(StartSampleY()));
      PvlKeyword ensY("EndSample", toString(EndSampleY()));
      PvlKeyword stlY("StartLine", toString(StartLineY()));
      PvlKeyword enlY("EndLine", toString(EndLineY()));
      PvlKeyword avgY("Average");
      PvlKeyword stdY("StandardDeviation");
      PvlKeyword varY("Variance");
      for (int band = 1; band <= Bands(); band++) {
        if (HasOverlap(band)) {
          avgY += toString(GetMStats(band).Y().Average());
          stdY += toString(GetMStats(band).Y().StandardDeviation());
          varY += toString(GetMStats(band).Y().Variance());
        }
      }
      gY += stsY;
      gY += ensY;
      gY += stlY;
      gY += enlY;
      gY += avgY;
      gY += stdY;
      gY += varY;

      o += PvlKeyword("File1", FileNameX().name());
      o += PvlKeyword("File2", FileNameY().name());
      o += PvlKeyword("Width", toString(Samples()));
      o += PvlKeyword("Height", toString(Lines()));
      o += PvlKeyword("SamplingPercent", toString(SampPercent()));
      o.AddGroup(gX);
      o.AddGroup(gY);

      PvlKeyword cov("Covariance");
      PvlKeyword cor("Correlation");

      PvlKeyword valid("ValidOverlap");
      PvlKeyword val("ValidPixels");
      PvlKeyword inv("InvalidPixels");
      PvlKeyword tot("TotalPixels");
      for (int band = 1; band <= Bands(); band++) {
        if (HasOverlap(band)) {
          QString validStr = "false";
          if (IsValid(band)) validStr = "true";
          valid += validStr;
          cov += toString(GetMStats(band).Covariance());
          cor += toString(GetMStats(band).Correlation());
          val += toString(GetMStats(band).ValidPixels());
          inv += toString(GetMStats(band).InvalidPixels());
          tot += toString(GetMStats(band).TotalPixels());
        }
      }
      o += valid;
      o += cov;
      o += cor;
      o += val;
      o += inv;
      o += tot;

      for (int band = 1; band <= Bands(); band++) {
        if (HasOverlap(band)) {
          QString bandStr = "LinearRegression" + toString(band);
          PvlKeyword LinReg(bandStr);
          double a, b;
          try {
            GetMStats(band).LinearRegression(a, b);
            LinReg += toString(a);
            LinReg += toString(b);
          }
          catch (IException &e) {
            // It is possible one of the overlaps was constant and therefore
            // the regression would be a vertical line (x=c instead of y=ax+b)
          }
          o += LinReg;
        }
      }

      return o;
    }
    catch (IException &e) {
      QString msg = "Trivial overlap between [" + FileNameX().name();
      msg += "] and [" + FileNameY().name() + "]";
      throw IException(IException::User, msg, _FILEINFO_);
    }
  }


  std::ostream &operator<<(std::ostream &os, Isis::OverlapStatistics &stats) {
    PvlObject p = stats.toPvl();
    os << p << endl;
    return os;
  }


}