javax.media.jai.Histogram.getLowValue()方法的使用及代码示例

x33g5p2x  于2022-01-20 转载在 其他  
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本文整理了Java中javax.media.jai.Histogram.getLowValue()方法的一些代码示例，展示了Histogram.getLowValue()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Histogram.getLowValue()方法的具体详情如下：
包路径：javax.media.jai.Histogram
类名称：Histogram
方法名：getLowValue

Histogram.getLowValue介绍

暂无

代码示例

代码示例来源：origin: geotools/geotools

@Override
  LookupTable createByteLookupTable(Map<String, Object> params) {
    Utilities.ensureNonNull("params", params);
    Histogram h = (Histogram) params.get(KEY_HISTOGRAM);
    final byte[] cumulative = new byte[h.getNumBins(0)];
    // sum of bins (we might have excluded 0 hence we cannot really optimise)
    float totalBinSum = 0;
    for (int i = 0; i < cumulative.length; i++) {
      totalBinSum += h.getBinSize(0, i);
    }
    // this is the scale factor for the histogram equalization process
    final float scale = (float) (h.getHighValue(0) - 1 - h.getLowValue(0)) / totalBinSum;
    float sum = 0;
    for (int i = 1; i < cumulative.length; i++) {
      sum += h.getBinSize(0, i - 1);
      cumulative[i] = (byte) ((sum * scale + h.getLowValue(0)) + .5F);
    }
    return generateLookupTableByte(cumulative);
  }
},

代码示例来源：origin: bcdev/beam

/**
 * Returns the width of the bin cells in the given histogram.
 *
 * @param histogram The histogram to inquire the bin cell width of.
 * @return The width of the bin cells in the histogram.
 */
public static double getBinWidth(Histogram histogram) {
  return (histogram.getHighValue(0) - histogram.getLowValue(0)) / histogram.getNumBins(0);
}

代码示例来源：origin: senbox-org/snap-desktop

static double getBinSize(Histogram histogram) {
  return (histogram.getHighValue(0) - histogram.getLowValue(0)) / histogram.getNumBins(0);
}

代码示例来源：origin: bcdev/beam

static double getBinSize(Histogram histogram) {
  return (histogram.getHighValue(0) - histogram.getLowValue(0)) / histogram.getNumBins(0);
}

代码示例来源：origin: bcdev/beam

private static void migrateOldHistogramData(Histogram oldHistogram, Histogram newHistogram) {
  final double oldMin = oldHistogram.getLowValue(0);
  final double oldMax = oldHistogram.getHighValue(0);
  final int[] oldBins = oldHistogram.getBins(0);
  final int oldNumBins = oldBins.length;
  final double oldBinWidth = computeBinWidth(oldMin, oldMax, oldNumBins);
  final double newMin = newHistogram.getLowValue(0);
  final double newMax = newHistogram.getHighValue(0);
  final int[] newBins = newHistogram.getBins(0);
  final int newNumBins = newBins.length;
  final double newBinWidth = computeBinWidth(newMin, newMax, newNumBins);
  for (int i = 0; i < oldBins.length; i++) {
    int count = oldBins[i];
    if (count == 0) {
      continue;
    }
    final double binCenterValue = oldMin + oldBinWidth * i + oldBinWidth / 2;
    int newBinIndex = (int) Math.floor((binCenterValue - newMin) / newBinWidth);
    if (newBinIndex >= newNumBins) {
      newBinIndex = newNumBins - 1;
    }
    newBins[newBinIndex] += count;
  }
}

代码示例来源：origin: locationtech/geowave

final javax.media.jai.Histogram histogram2) {
final int numBands = Math.min(histogram1.getNumBands(), histogram2.getNumBands());
final double[] lowValue1 = histogram1.getLowValue();
final double[] lowValue2 = histogram2.getLowValue();
final double[] lowValue = new double[numBands];
for (int b = 0; b < numBands; b++) {

代码示例来源：origin: bcdev/beam

private HistogramStxOp getHistogramOp(String vdnName, double minimum, double maximum, Band band) {
    HistogramStxOp histogramStxOp = histogramMap.get(vdnName);
    boolean intHistogram;
    intHistogram = band.getGeophysicalImage().getSampleModel().getDataType() < DataBuffer.TYPE_FLOAT;
    if (histogramStxOp == null) {
      histogramStxOp = new HistogramStxOp(initialBinCount, minimum, maximum, intHistogram, false);
      histogramMap.put(vdnName, histogramStxOp);
    } else {
      final Histogram oldHistogram = histogramStxOp.getHistogram();
      final double oldMin = oldHistogram.getLowValue()[0];
      final double oldMax = oldHistogram.getHighValue()[0];
      if (minimum < oldMin || maximum > oldMax) {
        histogramStxOp = HistogramExpanderTransmitter.createExpandedHistogramOp(oldHistogram, minimum, maximum, intHistogram, this.initialBinCount);
        histogramMap.put(vdnName, histogramStxOp);
      }
    }
    return histogramStxOp;
  }
}

代码示例来源：origin: bcdev/beam

private static Histogram getBeamHistogram(RenderedOp histogramImage) {
  javax.media.jai.Histogram jaiHistogram = JAIUtils.getHistogramOf(histogramImage);
    int[] bins = jaiHistogram.getBins(0);
  int minIndex = 0;
  int maxIndex = bins.length - 1;
  for (int i = 0; i < bins.length; i++) {
    if (bins[i] > 0) {
      minIndex = i;
      break;
    }
  }
  for (int i = bins.length - 1; i >= 0; i--) {
    if (bins[i] > 0) {
      maxIndex = i;
      break;
    }
  }
  double lowValue = jaiHistogram.getLowValue(0);
  double highValue = jaiHistogram.getHighValue(0);
  int numBins = jaiHistogram.getNumBins(0);
  double binWidth = (highValue - lowValue) / numBins;
  int[] croppedBins = new int[maxIndex - minIndex + 1];
  System.arraycopy(bins, minIndex, croppedBins, 0, croppedBins.length);
  return new Histogram(croppedBins, lowValue + minIndex * binWidth, lowValue
      + (maxIndex + 1.0) * binWidth);
}

代码示例来源：origin: bcdev/beam

static HistogramStxOp createExpandedHistogramOp(Histogram oldHistogram, double minimum, double maximum, boolean intHistogram, int initialBinCount) {
  final double oldMin = oldHistogram.getLowValue()[0];
  final double oldMax = oldHistogram.getHighValue()[0];
  final double newMin = Math.min(oldMin, minimum);

代码示例来源：origin: senbox-org/snap-desktop

HashMap<String, Object> statistics = new HashMap<>();
Histogram histogram = getHistogram(mask);
statistics.put("minimum", histogram.getLowValue(0));
statistics.put("maximum", histogram.getHighValue(0));
statistics.put("median", histogram.getPTileThreshold(0.5)[0]);

代码示例来源：origin: bcdev/beam

HashMap<String, Number> statistics = new HashMap<>();
Histogram histogram = getHistogram(mask);
statistics.put("minimum", histogram.getLowValue(0));
statistics.put("maximum", histogram.getHighValue(0));
statistics.put("median", histogram.getPTileThreshold(0.5)[0]);

代码示例来源：origin: bcdev/beam

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.isLogHistogram(),
                 sourceStx.isIntHistogram(),
                 targetHistogram,
                 sourceStx.getResolutionLevel());
  targetRaster.setStx(targetStx);
}

代码示例来源：origin: bcdev/beam

pb.add(1);  // yPeriod
pb.add(histogram.getLowValue()); // ?

代码示例来源：origin: bcdev/beam

@Test
public void testMinMaxBinsLogHistogram() throws Exception {
  StxFactory factory = new StxFactory();
  factory
      .withMinimum(0.1)
      .withMaximum(10)
      .withLogHistogram(true)
      .withHistogramBins(new int[]{1, 2, 3, 6, 6, 3, 2, 1});
  Stx stx = factory.create();
  assertNotNull(stx.getHistogram());
  assertEquals(1, stx.getHistogram().getNumBands());
  assertEquals(8, stx.getHistogram().getNumBins()[0]);
  assertEquals(0.1, stx.getMinimum(), 1e-10);
  assertEquals(10, stx.getMaximum(), 1e-10);
  assertEquals(Math.pow(10.0, stx.getHistogram().getMean()[0]), stx.getMean(), 1e-3);
  assertEquals(Math.pow(10.0, 0), stx.getMedian(), 1e-3);
  assertEquals(-1.0, stx.getHistogram().getLowValue(0), 1e-10);
  assertEquals(1.0, stx.getHistogram().getHighValue(0), 1e-10);
  assertArrayEquals(new int[]{1, 2, 3, 6, 6, 3, 2, 1}, stx.getHistogramBins());
}

代码示例来源：origin: bcdev/beam

@Test
public void testMinIsMax() throws Exception {
  StxFactory factory = new StxFactory();
  factory
      .withMinimum(0)
      .withMaximum(0)
      .withHistogramBins(new int[]{1000, 0, 0, 0, 0, 0, 0, 0});
  Stx stx = factory.create();
  assertEquals(0, stx.getMinimum(), 1e-10);
  assertEquals(0, stx.getMaximum(), 1e-10);
  assertEquals(0, stx.getMean(), 1e-10);
  assertEquals(0, stx.getMedian(), 1e-10);
  assertNotNull(stx.getHistogram());
  assertEquals(1, stx.getHistogram().getNumBands());
  assertEquals(8, stx.getHistogram().getNumBins()[0]);
  assertEquals(0, stx.getHistogram().getLowValue(0), 1E-10);
  assertEquals(1.0E-10, stx.getHistogram().getHighValue(0), 1E-10);
  assertTrue(stx.getHistogram().getLowValue(0) < stx.getHistogram().getHighValue(0));
  assertArrayEquals(new int[]{1000, 0, 0, 0, 0, 0, 0, 0}, stx.getHistogramBins());
}

代码示例来源：origin: bcdev/beam

@Test
public void testMinAndMaxAreTheSameVeryLargePositiveValue() throws Exception {
  double aLargePositiveValue = Double.MAX_VALUE;
  double aSlightlySmallerValue = Math.nextAfter(aLargePositiveValue, Double.NEGATIVE_INFINITY);
  StxFactory factory = new StxFactory();
  factory
      .withMinimum(aLargePositiveValue)
      .withMaximum(aLargePositiveValue)
      .withHistogramBins(new int[]{1000, 0, 0, 0, 0, 0, 0, 0});
  Stx stx = factory.create();
  assertEquals(aLargePositiveValue, stx.getMinimum(), 1e-10);
  assertEquals(aLargePositiveValue, stx.getMaximum(), 1e-10);
  assertEquals(aLargePositiveValue, stx.getMean(), 1e-10);
  assertEquals(aLargePositiveValue, stx.getMedian(), 1e-10);
  assertNotNull(stx.getHistogram());
  assertEquals(1, stx.getHistogram().getNumBands());
  assertEquals(8, stx.getHistogram().getNumBins()[0]);
  assertEquals(aSlightlySmallerValue, stx.getHistogram().getLowValue(0), 1E-10);
  assertEquals(aLargePositiveValue, stx.getHistogram().getHighValue(0), 1E-10);
  assertTrue(stx.getHistogram().getLowValue(0) < stx.getHistogram().getHighValue(0));
  assertArrayEquals(new int[]{1000, 0, 0, 0, 0, 0, 0, 0}, stx.getHistogramBins());
}

代码示例来源：origin: bcdev/beam

@Test
public void testMinAndMaxAreTheSameVeryLargeNegativeValue() throws Exception {
  double aLargeNegativeValue = -Double.MAX_VALUE;
  double aSlightlyLargerValue = Math.nextUp(aLargeNegativeValue);
  StxFactory factory = new StxFactory();
  factory
      .withMinimum(aLargeNegativeValue)
      .withMaximum(aLargeNegativeValue)
      .withHistogramBins(new int[]{1000, 0, 0, 0, 0, 0, 0, 0});
  Stx stx = factory.create();
  assertEquals(aLargeNegativeValue, stx.getMinimum(), 1e-10);
  assertEquals(aLargeNegativeValue, stx.getMaximum(), 1e-10);
  assertEquals(aLargeNegativeValue, stx.getMean(), 1e-10);
  assertEquals(aLargeNegativeValue, stx.getMedian(), 1e-10);
  assertNotNull(stx.getHistogram());
  assertEquals(1, stx.getHistogram().getNumBands());
  assertEquals(8, stx.getHistogram().getNumBins()[0]);
  assertEquals(aLargeNegativeValue, stx.getHistogram().getLowValue(0), 1E-10);
  assertEquals(aSlightlyLargerValue, stx.getHistogram().getHighValue(0), 1E-10);
  assertTrue(stx.getHistogram().getLowValue(0) < stx.getHistogram().getHighValue(0));
  assertArrayEquals(new int[]{1000, 0, 0, 0, 0, 0, 0, 0}, stx.getHistogramBins());
}

代码示例来源：origin: bcdev/beam

@Test
public void testMinMaxBins() throws Exception {
  StxFactory factory = new StxFactory();
  factory
      .withMinimum(-1.0)
      .withMaximum(1.0)
      .withHistogramBins(new int[]{1, 2, 3, 6, 6, 3, 2, 1});
  Stx stx = factory.create();
  assertEquals(-1.0, stx.getMinimum(), 1e-10);
  assertEquals(1.0, stx.getMaximum(), 1e-10);
  assertEquals(-0.125, stx.getMean(), 1e-10);
  assertEquals(0.0, stx.getMedian(), 1e-10);
  assertNotNull(stx.getHistogram());
  assertEquals(1, stx.getHistogram().getNumBands());
  assertEquals(8, stx.getHistogram().getNumBins()[0]);
  assertEquals(-1.0, stx.getHistogram().getLowValue(0), 1e-10);
  assertEquals(1.0, stx.getHistogram().getHighValue(0), 1e-10);
  assertArrayEquals(new int[]{1, 2, 3, 6, 6, 3, 2, 1}, stx.getHistogramBins());
}

代码示例来源：origin: bcdev/beam

@Test
public void testMinMaxBinsIntHistogram() throws Exception {
  StxFactory factory = new StxFactory();
  factory
      .withMinimum(1)
      .withMaximum(100)
      .withIntHistogram(true)
      .withHistogramBins(new int[]{1, 2, 3, 6, 6, 3, 2, 1});
  Stx stx = factory.create();
  assertEquals(1, stx.getMinimum(), 1e-10);
  assertEquals(100, stx.getMaximum(), 1e-10);
  assertEquals(44.75, stx.getMean(), 1e-10);
  assertEquals(51.0, stx.getMedian(), 1e-10);
  assertNotNull(stx.getHistogram());
  assertEquals(1, stx.getHistogram().getNumBands());
  assertEquals(8, stx.getHistogram().getNumBins()[0]);
  assertEquals(1, stx.getHistogram().getLowValue(0), 1e-10);
  assertEquals(101, stx.getHistogram().getHighValue(0), 1e-10);
  assertArrayEquals(new int[]{1, 2, 3, 6, 6, 3, 2, 1}, stx.getHistogramBins());
}

代码示例来源：origin: bcdev/beam

@Test
public void testMinMaxBinsLogHistogramWithNegativeMinimum() throws Exception {
  StxFactory factory = new StxFactory();
  factory
      .withMinimum(-10)
      .withMaximum(+10)
      .withLogHistogram(true)
      .withHistogramBins(new int[]{1, 2, 3, 6, 6, 3, 2, 1});
  Stx stx = factory.create();
  assertEquals(-10, stx.getMinimum(), 1e-10);
  assertEquals(+10, stx.getMaximum(), 1e-10);
  assertEquals(0.0, stx.getMean(), 1e-3);
  assertEquals(0.0, stx.getMedian(), 1e-3);
  assertNotNull(stx.getHistogram());
  assertEquals(1, stx.getHistogram().getNumBands());
  assertEquals(8, stx.getHistogram().getNumBins()[0]);
  assertEquals(-9.0, stx.getHistogram().getLowValue(0), 1e-10); // 1E-9 is the max value we handle
  assertEquals(1.0, stx.getHistogram().getHighValue(0), 1e-10);
  assertArrayEquals(new int[]{1, 2, 3, 6, 6, 3, 2, 1}, stx.getHistogramBins());
}

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