Package org.esa.snap.core.util.math

Class Histogram

java.lang.Object

org.esa.snap.core.util.math.Range

org.esa.snap.core.util.math.Histogram

public class Histogram
extends Range

Instances of the Histogram class store histogram data.

Field Summary

Fields

Modifier and Type	Field	Description
static final float	LEFT_AREA_SKIPPED_95
static final float	RIGHT_AREA_SKIPPED_95

Constructor Summary

Constructors

Constructor	Description
Histogram(int[] binCounts, double min, double max)	Constructs a new instance for the given bin counts and the given value range.

Method Summary

Modifier and Type	Method	Description
void	aggregate(Object values, boolean unsigned, IndexValidator validator, ProgressMonitor pm)
static Histogram	computeHistogram(RenderedImage image, javax.media.jai.ROI roi, int numBins, Range range)
static Histogram	computeHistogramByte(byte[] values, IndexValidator validator, int numBins, Range range, Histogram histo, ProgressMonitor pm)	Computes the histogram for the values in the given byte array in the given value range.
static Histogram	computeHistogramDouble(double[] values, IndexValidator validator, int numBins, Range range, Histogram histogram, ProgressMonitor pm)	Computes the histogram for the values in the given double array in the given value range.
static Histogram	computeHistogramDouble(DoubleList values, IndexValidator validator, int numBins, Range range, Histogram histo, ProgressMonitor pm)	Computes the histogram for the values in the given Histogram.DoubleList in the given value range.
static Histogram	computeHistogramFloat(float[] values, IndexValidator validator, int numBins, Range range, Histogram histogram, ProgressMonitor pm)	Computes the histogram for the values in the given float array in the given value range.
static Histogram	computeHistogramGeneric(Object values, boolean unsigned, IndexValidator validator, int numBins, Range range, Histogram histogram, ProgressMonitor pm)	Computes the histogram for the values in the given Histogram.DoubleList in the given value range.
static Histogram	computeHistogramInt(int[] values, IndexValidator validator, int numBins, Range range, Histogram histogram, ProgressMonitor pm)	Computes the histogram for the values in the given int array in the given value range.
static Histogram	computeHistogramShort(short[] values, IndexValidator validator, int numBins, Range range, Histogram histo, ProgressMonitor pm)	Computes the histogram for the values in the given short array in the given value range.
static Histogram	computeHistogramUByte(byte[] values, IndexValidator validator, int numBins, Range range, Histogram histo, ProgressMonitor pm)	Computes the histogram for the values in the given byte array in the given value range.
static Histogram	computeHistogramUInt(int[] values, IndexValidator validator, int numBins, Range range, Histogram histogram, ProgressMonitor pm)	Computes the histogram for the values in the given int array in the given value range.
static Histogram	computeHistogramUShort(short[] values, IndexValidator validator, int numBins, Range range, Histogram histo, ProgressMonitor pm)	Computes the histogram for the values in the given short array in the given value range.
Range	findRange(double leftHistoAreaSkipped, double rightHistoAreaSkipped)	Returns the value range for the case that the given ratios of the sum of all bin values are skipped from the lower and upper bounds of this histogram.
Range	findRange(double leftHistoAreaSkipped, double rightHistoAreaSkipped, boolean skipLeftPeek, boolean skipRightPeek)
Range	findRangeFor95Percent()	Returns the value range for the case that 2.5% of the sum of all bin values are skipped from the the lower and upper bounds of this histogram.
Range	findRangeForPercent(double threshold)	Returns the value range for any threshold of 0% to 100% where the sum of all bin values are skipped from the the lower and upper bounds of this histogram.
int[]	getBinCounts()	Gets the bin values of this histogram.
int	getBinCountsSum()	Gets the sum of all counts
int	getBinIndex(double value)	Gets the bin index for the given value.
int	getMaxBinCount()	Gets the maximum bin value found this histogram.
int	getNumBins()	Gets the number of bins in this histogram.
Range	getRange(int binIndex)	Gets the data value range for the given bin index.
Range	getRange(int binIndex1, int binIndex2)	Gets the data value range for the given bin index range.
void	setBinCounts(int[] binCounts)	Sets the bin values of this histogram.
void	setBinCounts(int[] binValues, double min, double max)	Sets the bin values and range of this histogram.

Methods inherited from class org.esa.snap.core.util.math.Range

computeRangeByte, computeRangeDouble, computeRangeDouble, computeRangeDouble, computeRangeFloat, computeRangeGeneric, computeRangeInt, computeRangeShort, computeRangeUByte, computeRangeUInt, computeRangeUShort, getMax, getMin, isValid, setMax, setMin, setMinMax, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

LEFT_AREA_SKIPPED_95

public static final float LEFT_AREA_SKIPPED_95

See Also:

• Constant Field Values

RIGHT_AREA_SKIPPED_95

public static final float RIGHT_AREA_SKIPPED_95

See Also:

• Constant Field Values

Constructor Details

Histogram

public Histogram(int[] binCounts,
 double min,
 double max)

Constructs a new instance for the given bin counts and the given value range.

Parameters:

binCounts - the bin counts

min - the minimum value

max - the maximum value

Method Details

getNumBins

public int getNumBins()

Gets the number of bins in this histogram.

Returns:

the number of bins

getBinCounts

public int[] getBinCounts()

Gets the bin values of this histogram.

Returns:

the bin values

setBinCounts

public void setBinCounts(int[] binValues,
 double min,
 double max)

Sets the bin values and range of this histogram.

Parameters:

binValues - the bin values

min - the minimum value of the range

max - the maximum value of the range

setBinCounts

public void setBinCounts(int[] binCounts)

Sets the bin values of this histogram.

Parameters:

binCounts - the bin values

getMaxBinCount

public int getMaxBinCount()

Gets the maximum bin value found this histogram.

Returns:

the maximum bin value

getBinCountsSum

public int getBinCountsSum()

Gets the sum of all counts

Returns:

the sum of all counts.

findRangeFor95Percent

public Range findRangeFor95Percent()

Returns the value range for the case that 2.5% of the sum of all bin values are skipped from the the lower and upper bounds of this histogram.

Returns:

the skipped value range, that include 95% of the sum of all bin values

findRangeForPercent

public Range findRangeForPercent(double threshold)

Returns the value range for any threshold of 0% to 100% where the sum of all bin values are skipped from the the lower and upper bounds of this histogram.

Returns:

the skipped value range, that include given percent of the sum of all bin values

findRange

public Range findRange(double leftHistoAreaSkipped,
 double rightHistoAreaSkipped)

Returns the value range for the case that the given ratios of the sum of all bin values are skipped from the lower and upper bounds of this histogram.

Parameters:

leftHistoAreaSkipped - the normalized area (a ratio of the entire area) of samples skipped from the left end of the histogram, must be greater than or equal to 0.0 and less than 1.0 - rightHistoAreaSkipped

rightHistoAreaSkipped - the normalized area (a ratio of the entire area) of samples skipped from the upper end of the histogram must be greater than or equal to 0.0 and less than 1.0 - leftHistoAreaSkipped

Returns:

the readjusted range

findRange

public Range findRange(double leftHistoAreaSkipped,
 double rightHistoAreaSkipped,
 boolean skipLeftPeek,
 boolean skipRightPeek)

getRange

public Range getRange(int binIndex)

Gets the data value range for the given bin index.

Parameters:

binIndex - the bin index

Returns:

the data value range

getRange

public Range getRange(int binIndex1,
 int binIndex2)

Gets the data value range for the given bin index range.

Parameters:

binIndex1 - the first bin index

binIndex2 - the second bin index

Returns:

the data value range

getBinIndex

public int getBinIndex(double value)

Gets the bin index for the given value.

Parameters:

value - the value

Returns:

the bin index or -1 if the value is not covered by this histogram.

aggregate

public void aggregate(Object values,
 boolean unsigned,
 IndexValidator validator,
 ProgressMonitor pm)

Overrides:

aggregate in class Range

computeHistogramByte

public static Histogram computeHistogramByte(byte[] values,
 IndexValidator validator,
 int numBins,
 Range range,
 Histogram histo,
 ProgressMonitor pm)

Computes the histogram for the values in the given byte array in the given value range. The array elements are interpreted as signed byte values. Values at a given index i for which validator.validate(i) returns false are excluded from the computation.

Parameters:

values - the array whose histogram to compute

validator - used to validate the array indexes, must not be null. Use IndexValidator.TRUE instead.

numBins - the number of bins for the histogram

range - the value range, if null the range is automatically computed

pm - a monitor to inform the user about progress

Returns:

the histogram for the given array

See Also:

• computeHistogramUByte(byte[], org.esa.snap.core.util.math.IndexValidator, int, org.esa.snap.core.util.math.Range, org.esa.snap.core.util.math.Histogram, com.bc.ceres.core.ProgressMonitor)

computeHistogramUByte

public static Histogram computeHistogramUByte(byte[] values,
 IndexValidator validator,
 int numBins,
 Range range,
 Histogram histo,
 ProgressMonitor pm)

Computes the histogram for the values in the given byte array in the given value range. The array elements are interpreted as unsigned byte values. Values at a given index i for which validator.validate(i) returns false are excluded from the computation.

Parameters:

values - the array whose histogram to compute

validator - used to validate the array indexes, must not be null. Use IndexValidator.TRUE instead.

numBins - the number of bins for the histogram

range - the value range, if null the range is automatically computed

pm - a monitor to inform the user about progress

Returns:

the histogram for the given array

See Also:

• computeHistogramByte(byte[], org.esa.snap.core.util.math.IndexValidator, int, org.esa.snap.core.util.math.Range, org.esa.snap.core.util.math.Histogram, com.bc.ceres.core.ProgressMonitor)

computeHistogramShort

public static Histogram computeHistogramShort(short[] values,
 IndexValidator validator,
 int numBins,
 Range range,
 Histogram histo,
 ProgressMonitor pm)

Computes the histogram for the values in the given short array in the given value range. The array elements are interpreted as signed short values. Values at a given index i for which validator.validate(i) returns false are excluded from the computation.

Parameters:

values - the array whose histogram to compute

validator - used to validate the array indexes, must not be null. Use IndexValidator.TRUE instead.

numBins - the number of bins for the histogram

range - the value range, if null the range is automatically computed

Returns:

the histogram for the given array

See Also:

• computeHistogramUShort(short[], org.esa.snap.core.util.math.IndexValidator, int, org.esa.snap.core.util.math.Range, org.esa.snap.core.util.math.Histogram, com.bc.ceres.core.ProgressMonitor)

computeHistogramUShort

public static Histogram computeHistogramUShort(short[] values,
 IndexValidator validator,
 int numBins,
 Range range,
 Histogram histo,
 ProgressMonitor pm)

Computes the histogram for the values in the given short array in the given value range. The array elements are interpreted as unsigned short values. Values at a given index i for which validator.validate(i) returns false are excluded from the computation.

Parameters:

values - the array whose histogram to compute

validator - used to validate the array indexes, must not be null. Use IndexValidator.TRUE instead.

numBins - the number of bins for the histogram

range - the value range, if null the range is automatically computed

pm - a monitor to inform the user about progress

Returns:

the histogram for the given array

See Also:

• computeHistogramShort(short[], org.esa.snap.core.util.math.IndexValidator, int, org.esa.snap.core.util.math.Range, org.esa.snap.core.util.math.Histogram, com.bc.ceres.core.ProgressMonitor)

computeHistogramInt

public static Histogram computeHistogramInt(int[] values,
 IndexValidator validator,
 int numBins,
 Range range,
 Histogram histogram,
 ProgressMonitor pm)

Computes the histogram for the values in the given int array in the given value range. The array elements are interpreted as signed byte values. Values at a given index i for which validator.validate(i) returns false are excluded from the computation.

Parameters:

values - the array whose histogram to compute

validator - used to validate the array indexes, must not be null. Use IndexValidator.TRUE instead.

numBins - the number of bins for the histogram

range - the value range, if null the range is automatically computed

histogram - a histogram instance to be reused, can be null

pm - a monitor to inform the user about progress

Returns:

the histogram for the given array

See Also:

• computeHistogramUInt(int[], org.esa.snap.core.util.math.IndexValidator, int, org.esa.snap.core.util.math.Range, org.esa.snap.core.util.math.Histogram, com.bc.ceres.core.ProgressMonitor)

computeHistogramUInt

public static Histogram computeHistogramUInt(int[] values,
 IndexValidator validator,
 int numBins,
 Range range,
 Histogram histogram,
 ProgressMonitor pm)

Computes the histogram for the values in the given int array in the given value range. The array elements are interpreted as unsigned byte values. Values at a given index i for which validator.validate(i) returns false are excluded from the computation.

Parameters:

values - the array whose histogram to compute

validator - used to validate the array indexes, must not be null. Use IndexValidator.TRUE instead.

range - the value range, if null the range is automatically computed

histogram - a histogram instance to be reused, can be null

pm - a monitor to inform the user about progress

Returns:

the histogram for the given array of values

See Also:

• computeHistogramInt(int[], org.esa.snap.core.util.math.IndexValidator, int, org.esa.snap.core.util.math.Range, org.esa.snap.core.util.math.Histogram, com.bc.ceres.core.ProgressMonitor)

computeHistogramFloat

public static Histogram computeHistogramFloat(float[] values,
 IndexValidator validator,
 int numBins,
 Range range,
 Histogram histogram,
 ProgressMonitor pm)

Computes the histogram for the values in the given float array in the given value range. Values at a given index i for which validator.validate(i) returns false are excluded from the computation.

Parameters:

values - the array whose histogram to compute

validator - used to validate the array indexes, must not be null. Use IndexValidator.TRUE instead.

numBins - the number of bins for the histogram

range - the value range, if null the range is automatically computed

histogram - a histogram instance to be reused, can be null

pm - a monitor to inform the user about progress

Returns:

the histogram for the given array of values

See Also:

• computeHistogramDouble(double[], org.esa.snap.core.util.math.IndexValidator, int, org.esa.snap.core.util.math.Range, org.esa.snap.core.util.math.Histogram, com.bc.ceres.core.ProgressMonitor)

computeHistogramDouble

public static Histogram computeHistogramDouble(double[] values,
 IndexValidator validator,
 int numBins,
 Range range,
 Histogram histogram,
 ProgressMonitor pm)

Computes the histogram for the values in the given double array in the given value range. Values at a given index i for which validator.validate(i) returns false are excluded from the computation.

Parameters:

values - the array whose histogram to compute

validator - used to validate the array indexes, must not be null. Use IndexValidator.TRUE instead.

numBins - the number of bins for the histogram

range - the value range, if null the range is automatically computed

histogram - a histogram instance to be reused, can be null

pm - a monitor to inform the user about progress

Returns:

the histogram for the given array of values

See Also:

• computeHistogramFloat(float[], org.esa.snap.core.util.math.IndexValidator, int, org.esa.snap.core.util.math.Range, org.esa.snap.core.util.math.Histogram, com.bc.ceres.core.ProgressMonitor)

computeHistogramDouble

public static Histogram computeHistogramDouble(DoubleList values,
 IndexValidator validator,
 int numBins,
 Range range,
 Histogram histo,
 ProgressMonitor pm)

Computes the histogram for the values in the given Histogram.DoubleList in the given value range. Values at a given index i for which validator.validate(i) returns false are excluded from the computation.

Parameters:

values - the Histogram.DoubleList whose histogram to compute

validator - used to validate the indexes, must not be null. Use IndexValidator.TRUE instead.

numBins - the number of bins for the histogram

range - the value range, if null the range is automatically computed

pm - a monitor to inform the user about progress

Returns:

the histogram for the given values

See Also:

• computeHistogramByte(byte[], org.esa.snap.core.util.math.IndexValidator, int, org.esa.snap.core.util.math.Range, org.esa.snap.core.util.math.Histogram, com.bc.ceres.core.ProgressMonitor)

computeHistogramGeneric

public static Histogram computeHistogramGeneric(Object values,
 boolean unsigned,
 IndexValidator validator,
 int numBins,
 Range range,
 Histogram histogram,
 ProgressMonitor pm)

Computes the histogram for the values in the given Histogram.DoubleList in the given value range. Values at a given index i for which validator.validate(i) returns false are excluded from the computation.

Parameters:

values - the Histogram.DoubleList whose histogram to compute

validator - used to validate the indexes, must not be null. Use IndexValidator.TRUE instead.

numBins - the number of bins for the histogram

range - the value range, if null the range is automatically computed

pm - a monitor to inform the user about progress

Returns:

the histogram for the given values

See Also:

• computeHistogramByte(byte[], org.esa.snap.core.util.math.IndexValidator, int, org.esa.snap.core.util.math.Range, org.esa.snap.core.util.math.Histogram, com.bc.ceres.core.ProgressMonitor)

computeHistogram

public static Histogram computeHistogram(RenderedImage image,
 javax.media.jai.ROI roi,
 int numBins,
 Range range)