/// <summary>
/// Initializes a new instance of the <see cref="Segment" /> class.
/// </summary>
/// <param name="numberOfBands">The number of bands.</param>
/// <param name="statistics">The statistics computed for the segment.</param>
/// <exception cref="System.ArgumentOutOfRangeException">The number of bands is less than 1.</exception>
public Segment(Int32 numberOfBands, SpectralStatistics statistics)
{
if (numberOfBands < 1)
{
throw new ArgumentOutOfRangeException(nameof(numberOfBands), "The number of bands is less than 1.");
}
Count = 0;
// initialize collections
_mean = new Double[numberOfBands];
if (statistics.HasFlag(SpectralStatistics.Variance))
{
_meanSquare = new Double[numberOfBands];
_variance = new Double[numberOfBands];
}
if (statistics.HasFlag(SpectralStatistics.Comoment))
{
_comoment = new Double[numberOfBands, numberOfBands];
}
if (statistics.HasFlag(SpectralStatistics.Covariance))
{
Covariance = new Double[numberOfBands, numberOfBands];
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SegmentCollection" /> class.
/// </summary>
/// <param name="other">The other segment collection.</param>
/// <param name="statistics">The spectral statistics.</param>
/// <exception cref="System.ArgumentNullException">The other segment collection is null.</exception>
public SegmentCollection(SegmentCollection other, SpectralStatistics statistics)
{
if (other == null)
{
throw new ArgumentNullException("other", "The other segment collection is null.");
}
Raster = other.Raster;
Count = other.Count;
Statistics = other.Statistics | statistics;
_indexToSegmentDictionary = new Dictionary <Int32, Segment>();
_segmentToIndexDictionary = new Dictionary <Segment, List <Int32> >();
foreach (Segment otherSegment in other._segmentToIndexDictionary.Keys)
{
List <Int32> otherIndices = other._segmentToIndexDictionary[otherSegment];
Segment segment;
if (Statistics == other.Statistics)
{
segment = new Segment(otherSegment);
otherIndices.ForEach(x => _indexToSegmentDictionary.Add(x, segment));
}
else
{
Int32 rowIndex = otherIndices[0] / Raster.NumberOfColumns;
Int32 columnIndex = otherIndices[0] % Raster.NumberOfColumns;
if (Raster.Format == RasterFormat.Integer)
{
segment = new Segment(Raster.GetValues(rowIndex, columnIndex), Statistics);
for (Int32 i = 0; i < other._segmentToIndexDictionary[otherSegment].Count; i++)
{
_indexToSegmentDictionary.Add(otherIndices[i], segment);
rowIndex = otherIndices[i] / Raster.NumberOfColumns;
columnIndex = otherIndices[i] % Raster.NumberOfColumns;
segment.AddValues(Raster.GetValues(rowIndex, columnIndex));
}
}
else
{
segment = new Segment(Raster.GetFloatValues(rowIndex, columnIndex), Statistics);
for (Int32 i = 0; i < other._segmentToIndexDictionary[otherSegment].Count; i++)
{
_indexToSegmentDictionary.Add(otherIndices[i], segment);
rowIndex = otherIndices[i] / Raster.NumberOfColumns;
columnIndex = otherIndices[i] % Raster.NumberOfColumns;
segment.AddFloatValues(Raster.GetFloatValues(rowIndex, columnIndex));
}
}
}
_segmentToIndexDictionary.Add(segment, new List <Int32>(otherIndices));
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SegmentCollection" /> class.
/// </summary>
/// <param name="raster">The raster.</param>
/// <param name="statistics">The statistics computed for the segments.</param>
/// <exception cref="System.ArgumentNullException">The raster is null.</exception>
public SegmentCollection(IRaster raster, SpectralStatistics statistics)
: this(statistics)
{
if (raster == null)
{
throw new ArgumentNullException("raster", "The raster is null.");
}
Raster = raster;
Count = raster.NumberOfRows * raster.NumberOfColumns;
_indexToSegmentDictionary = new Dictionary <Int32, Segment>(raster.NumberOfRows * raster.NumberOfColumns);
_segmentToIndexDictionary = new Dictionary <Segment, List <Int32> >();
}
/// <summary>
/// Initializes a new instance of the <see cref="Segment" /> class.
/// </summary>
/// <param name="spectralValues">The array of spectral values.</param>
/// <param name="statistics">The statistics computed for the segment.</param>
/// <exception cref="System.ArgumentNullException">The array of spectral values is null.</exception>
/// <exception cref="System.ArgumentException">The array of spectral values is empty.</exception>
public Segment(Double[] spectralValues, SpectralStatistics statistics)
: this(spectralValues == null || spectralValues.Length == 0 ? 1 : spectralValues.Length, statistics)
{
if (spectralValues == null)
{
throw new ArgumentNullException(nameof(spectralValues), "The array of spectral values is null.");
}
if (spectralValues.Length == 0)
{
throw new ArgumentException("The array of spectral values is empty.", "spectralValues");
}
AddFloatValues(spectralValues);
}
/// <summary>
/// Initializes a new instance of the <see cref="QuadSegmentCollection" /> class.
/// </summary>
/// <param name="raster">The raster.</param>
/// <exception cref="System.ArgumentNullException">The raster is null.</exception>
public QuadSegmentCollection(IRaster raster, SpectralStatistics statistics)
: base(statistics)
{
if (raster == null)
{
throw new ArgumentNullException("raster", "The raster is null.");
}
Raster = raster;
Count = 1;
_indexToSegmentDictionary = new Dictionary <Int32, Segment>(raster.NumberOfRows * raster.NumberOfColumns);
Segment segment = new Segment(raster, Statistics)
{
MortonCode = 1
};
_segmentToIndexDictionary = new Dictionary <Segment, List <Int32> >();
for (Int32 index = 0; index < raster.NumberOfRows * raster.NumberOfColumns; index++)
{
_indexToSegmentDictionary.Add(index, segment);
}
_segmentToIndexDictionary.Add(_indexToSegmentDictionary[0], new List <Int32>(Enumerable.Range(0, raster.NumberOfRows * raster.NumberOfColumns)));
}
/// <summary>
/// Initializes a new instance of the <see cref="Segment" /> class.
/// </summary>
/// <param name="raster">The raster from which the segment is derived.</param>
/// <param name="statistics">The statistics computed for the segment.</param>
/// <exception cref="System.ArgumentNullException">The raster is null.</exception>
public Segment(IRaster raster, SpectralStatistics statistics)
{
if (raster == null)
{
throw new ArgumentNullException("raster", "The raster is null.");
}
Count = raster.NumberOfRows * raster.NumberOfColumns;
// mean computation
_mean = new Double[raster.NumberOfBands];
for (Int32 rowIndex = 0; rowIndex < raster.NumberOfRows; rowIndex++)
{
for (Int32 columnIndex = 0; columnIndex < raster.NumberOfColumns; columnIndex++)
{
for (Int32 bandIndex = 0; bandIndex < raster.NumberOfBands; bandIndex++)
{
_mean[bandIndex] += raster.GetFloatValue(rowIndex, columnIndex, bandIndex);
}
}
}
for (Int32 bandIndex = 0; bandIndex < raster.NumberOfBands; bandIndex++)
{
_mean[bandIndex] /= (raster.NumberOfColumns * raster.NumberOfRows);
}
// variance computation
if (statistics.HasFlag(SpectralStatistics.Variance) && raster.NumberOfColumns * raster.NumberOfRows > 1)
{
_meanSquare = new Double[raster.NumberOfBands];
_variance = new Double[raster.NumberOfBands];
for (Int32 rowIndex = 0; rowIndex < raster.NumberOfRows; rowIndex++)
{
for (Int32 columnIndex = 0; columnIndex < raster.NumberOfColumns; columnIndex++)
{
for (Int32 bandIndex = 0; bandIndex < raster.NumberOfBands; bandIndex++)
{
_variance[bandIndex] += Math.Pow(_mean[bandIndex] - raster.GetFloatValue(rowIndex, columnIndex, bandIndex), 2);
}
}
}
for (Int32 bandIndex = 0; bandIndex < raster.NumberOfBands; bandIndex++)
{
_meanSquare[bandIndex] = _mean[bandIndex] * _mean[bandIndex];
_variance[bandIndex] /= (raster.NumberOfColumns * raster.NumberOfRows - 1);
}
}
// comoment computation
if (statistics.HasFlag(SpectralStatistics.Comoment))
{
_comoment = new Double[raster.NumberOfBands, raster.NumberOfBands];
for (Int32 rowIndex = 0; rowIndex < raster.NumberOfRows; rowIndex++)
{
for (Int32 columnIndex = 0; columnIndex < raster.NumberOfColumns; columnIndex++)
{
for (Int32 bandIndex = 0; bandIndex < raster.NumberOfBands; bandIndex++)
{
for (Int32 otherBandIndex = 0; otherBandIndex < raster.NumberOfBands; otherBandIndex++)
{
_comoment[bandIndex, otherBandIndex] += (raster.GetFloatValue(rowIndex, columnIndex, bandIndex) - _mean[bandIndex]) * (raster.GetFloatValue(rowIndex, columnIndex, otherBandIndex) - _mean[otherBandIndex]);
}
}
}
}
}
// covariance computation
if (statistics.HasFlag(SpectralStatistics.Covariance) && raster.NumberOfColumns * raster.NumberOfRows > 1)
{
Covariance = new Double[raster.NumberOfBands, raster.NumberOfBands];
for (Int32 rowIndex = 0; rowIndex < raster.NumberOfRows; rowIndex++)
{
for (Int32 columnIndex = 0; columnIndex < raster.NumberOfColumns; columnIndex++)
{
for (Int32 bandIndex = 0; bandIndex < raster.NumberOfBands; bandIndex++)
{
for (Int32 otherBandIndex = 0; otherBandIndex < raster.NumberOfBands; otherBandIndex++)
{
Covariance[bandIndex, otherBandIndex] += (_mean[bandIndex] - raster.GetFloatValue(rowIndex, columnIndex, bandIndex)) * (_mean[otherBandIndex] - raster.GetFloatValue(rowIndex, columnIndex, otherBandIndex));
}
}
}
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SegmentCollection" /> class.
/// </summary>
/// <param name="statistics">The statistics computed for the segments.</param>
public SegmentCollection(SpectralStatistics statistics)
{
Statistics = statistics;
}