/**
* Constructs an OverlapStatistics object. Compares the two input cubes and
* finds where they overlap.
*
* @param x The first input cube
* @param y The second input cube
* @param progressMsg (Default value of "Gathering Overlap Statistics") Text
* for indicating progress during statistic gathering
* @param sampPercent (Default value of 100.0) Sampling percent, or the percentage
* of lines to consider during the statistic gathering procedure
*
* @throws Isis::iException::User - All images must have the same number of
* bands
*/
OverlapStatistics::OverlapStatistics(Isis::Cube &x, Isis::Cube &y,
std::string 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::Message(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.Bands() != y.Bands()) {
string msg = "Number of bands do not match between cubes [" +
p_xFile.Name() + "] and [" + p_yFile.Name() + "]";
throw iException::Message(iException::User,msg,_FILEINFO_);
}
p_bands = x.Bands();
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) {
string msg = "Mapping groups do not match between cubes [" +
p_xFile.Name() + "] and [" + p_yFile.Name() + "]";
throw iException::Message(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.Samples()+0.5);
double Ymin1 = projX->ToProjectionY(x.Lines()+0.5);
double Xmin2 = projY->ToProjectionX(0.5);
double Ymax2 = projY->ToProjectionY(0.5);
double Xmax2 = projY->ToProjectionX(y.Samples()+0.5);
double Ymin2 = projY->ToProjectionY(y.Lines()+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();
}
}
}
}
