public static int[] compute(Histogram h) {
int autoThreshold = 5000;
double threshold = ((h.getTotals())[0]) / autoThreshold;
int[] bins = h.getBins(0);
int nBins = bins.length;
int histogramMin = 0, histogramMax = 0;
double[] pThreshold = h.getPTileThreshold(0.4);
for (int loop = (int) pThreshold[0]; loop < nBins; loop++)
if (bins[loop] > threshold) {
histogramMin = loop;
break;
}
for (int loop = nBins - 1; loop >= 0; loop--)
if (bins[loop] > threshold) {
histogramMax = loop;
break;
}
if (histogramMax >= histogramMin) {
int lowValue = (int) h.getLowValue(0);
int min = lowValue + histogramMin;
int max = lowValue + histogramMax;
if (min == max) {
min = (int) h.getLowValue(0);
max = (int) h.getHighValue(0);
}
return new int[] {max - min, min + (int) ((max - min) / 2)};
}
return null;
}
private void copyStx(RasterDataNode sourceRaster, RasterDataNode targetRaster) {
final Stx sourceStx = sourceRaster.getStx();
final Histogram sourceHistogram = sourceStx.getHistogram();
final Histogram targetHistogram =
new Histogram(
sourceStx.getHistogramBinCount(),
sourceHistogram.getLowValue(0),
sourceHistogram.getHighValue(0),
1);
System.arraycopy(
sourceHistogram.getBins(0),
0,
targetHistogram.getBins(0),
0,
sourceStx.getHistogramBinCount());
final Stx targetStx =
new Stx(
sourceStx.getMinimum(),
sourceStx.getMaximum(),
sourceStx.getMean(),
sourceStx.getStandardDeviation(),
sourceStx.getCoefficientOfVariation(),
sourceStx.getEquivalentNumberOfLooks(),
sourceStx.isLogHistogram(),
sourceStx.isIntHistogram(),
targetHistogram,
sourceStx.getResolutionLevel());
targetRaster.setStx(targetStx);
}