gvsig-raster / org.gvsig.raster / trunk / org.gvsig.raster / org.gvsig.raster.lib / org.gvsig.raster.lib.impl / src / main / java / org / gvsig / raster / impl / datastruct / BufferHistogramImpl.java @ 2623
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/* gvSIG. Geographic Information System of the Valencian Government
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*
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* Copyright (C) 2007-2008 Infrastructures and Transports Department
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* of the Valencian Government (CIT)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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package org.gvsig.raster.impl.datastruct; |
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import org.gvsig.fmap.dal.coverage.RasterLibrary; |
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import org.gvsig.fmap.dal.coverage.dataset.Buffer; |
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import org.gvsig.fmap.dal.coverage.datastruct.BufferHistogram; |
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import org.gvsig.fmap.dal.coverage.datastruct.HistogramClass; |
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import org.gvsig.fmap.dal.coverage.datastruct.NoData; |
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import org.slf4j.LoggerFactory; |
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/**
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* Representa un histograma.
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*
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*/
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public class BufferHistogramImpl implements BufferHistogram { |
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/**
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* Variable que representa el histograma. La primera dimensi?n es el n?mero de
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* bandas y la segunda un array de clases. En el caso b?sico de un RGB una clase tendr? el
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* valor m?nimo igual al m?ximo.
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*/
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private HistogramClass[][] histogram = null; |
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private long[][] table = null; |
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private double[] min = null; |
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private double[] max = null; |
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private NoData noDataValue = null; |
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private int dataType = Buffer.TYPE_UNDEFINED; |
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private int nClasses = 0; |
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/**
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* Constructor
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* @param nBands N?mero de bandas
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* @param nClasses N?mero de clases en que hacemos la divisi?n
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* @param min Valor m?nimo del histograma
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* @param max Valor m?ximo del histograma
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*/
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public BufferHistogramImpl(int nBands, int nClasses, double[] min, double[] max) { |
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if ((nBands != min.length) || (nBands != max.length)) {
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System.out.println("No tiene las mismas bandas"); |
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} |
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constructorHistogramImpl(min, max, nClasses); |
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} |
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private void constructorHistogramImpl(double[] min, double[] max, int nClasses) { |
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table = new long[min.length][nClasses]; |
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for (int i = 0; i < table.length; i++) |
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for (int j = 0; j < table[0].length; j++) |
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table[i][j] = 0;
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this.min = (double[]) min.clone(); |
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this.max = (double[]) max.clone(); |
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this.nClasses = getNumValues();
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} |
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/**
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* Constructor
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* @param nBands N?mero de bandas
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* @param nClasses N?mero de clases en que hacemos la divisi?n
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* @param min Valor m?nimo del histograma
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* @param max Valor m?ximo del histograma
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*/
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public BufferHistogramImpl(int nBands, double[] min, double[] max, int dataType) { |
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int numberClasses;
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this.dataType = dataType;
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this.min = (double[]) min.clone(); |
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this.max = (double[]) max.clone(); |
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if (dataType == Buffer.TYPE_BYTE) { |
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numberClasses = RasterLibrary.defaultNumberOfColors; |
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boolean unsigned = false; |
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for (int i = 0; i < this.min.length; i++) |
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if (this.min[i] < 0) |
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unsigned = true;
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for (int i = 0; i < this.min.length; i++) { |
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if (unsigned) {
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this.min[i] = -128; |
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this.max[i] = 127; |
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} else {
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this.min[i] = 0; |
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this.max[i] = 255; |
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} |
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} |
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} else {
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numberClasses = RasterLibrary.defaultNumberOfClasses; |
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} |
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constructorHistogramImpl(this.min, this.max, numberClasses); |
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} |
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/**
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* Realiza la uni?n entre el histograma actual y el pasado
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* por par?metro.
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* @param hist
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*/
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public boolean union(BufferHistogram hist) { |
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long[][] auxTable = hist.getTable(); |
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if (auxTable.length != table.length)
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return false; |
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if (auxTable.length == 0) |
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return true; |
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if (auxTable[0].length != table[0].length) |
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return false; |
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for (int i = 0; i < table.length; i++) |
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for (int j = 0; j < table[i].length; j++) |
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table[i][j] += auxTable[i][j]; |
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return true; |
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} |
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/**
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* Asigna la tabla
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* @param t
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*/
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public void setTable(long[][] t) { |
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table = new long[t.length][t[0].length]; |
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for (int i = 0; i < table.length; i++) |
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for (int j = 0; j < table[0].length; j++) |
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table[i][j] = t[i][j]; |
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this.nClasses = getNumValues();
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} |
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/**
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* Devuelve el minimo valor del histograma
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* @return
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*/
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public double getMin(int band) { |
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return min[band];
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} |
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/**
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* Devuelve el maximo valor del histograma
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* @return
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*/
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public double getMax(int band) { |
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return max[band];
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} |
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/**
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* Devuelve los minimos valores del histograma
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* @return
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*/
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public double[] getMinims() { |
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return min;
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} |
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/**
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* Devuelve los maximos valores del histograma
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* @return
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*/
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public double[] getMaxims() { |
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return max;
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} |
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/**
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* Devuelve si un histograma esta en un rango RGB aceptable
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* @return
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*/
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public boolean isInRangeRGB() { |
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if (dataType == Buffer.TYPE_BYTE) |
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return true; |
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return true; |
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} |
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/**
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* Obtiene el histograma sin modificar
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* @return array bidimensional donde el primer elemento es el valor del pixel
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* o rango y el segundo el n?mero de elementos que aparecen.
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*/
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public HistogramClass[][] getHistogram() { |
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if (nClasses == 0) |
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return null; |
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histogram = new HistogramClass[table.length][nClasses];
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for (int i = 0; i < table.length; i++) { |
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for (int j = 0; j < table[i].length; j++) { |
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HistogramClass hc = new HistogramClassImpl( min[i] + ((j * (max[i] - min[i])) / (nClasses - 1)), |
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min[i] + (((j + 1) * (max[i] - min[i])) / (nClasses - 1))); |
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hc.setValue(table[i][j]); |
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histogram[i][j] = hc; |
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} |
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} |
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return histogram;
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} |
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/**
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* Obtiene el n?mero de bandas del histograma
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* @return entero que representa el n?mero de bandas
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*/
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public int getNumBands() { |
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if (table != null) |
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return table.length;
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return 0; |
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} |
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/**
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* Obtiene el tipo de datos del histograma original
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* @return
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*/
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public int getDataType() { |
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return dataType;
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} |
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/**
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* Obtiene la longitud (n?mero de valores) de una banda determinada
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* @param band Banda o obtener la longitud
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* @return entero con la longitud de la banda
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* rangos de valores y DataclassList.
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*/
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public int getBandLenght(int band) { |
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if (table != null) |
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return table[band].length;
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return 0; |
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} |
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/**
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* Obtiene el n?mero de valores o clases del histograma
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* @return entero que representa el n?mero de valores o clases del histograma
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*/
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public int getNumValues() { |
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if (table == null) |
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return 0; |
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if (table.length == 0) |
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return 0; |
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return table[0].length; |
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} |
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/**
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* Asigna un histograma
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* @param hist histograma asignado
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*/
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public void setHistogram(HistogramClass[][] hist){ |
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histogram = hist; |
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} |
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/**
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* Asigna un valor para una posici?n del histograma
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* @param band Valor del pixel o clase a asignar
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* @param px Valor del pixel
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* @param value Valor a asignar
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*/
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public void setHistogramValue(int band, double px, long value) { |
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int pos = (int) (((nClasses - 1) * (px - min[band])) / (max[band] - min[band])); |
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if (pos < 0) |
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pos = 0;
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if (pos >= nClasses)
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pos = nClasses - 1;
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table[band][pos] = value; |
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} |
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/**
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* Asigna un valor para una posici?n del histograma segun la posicion en las
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* clases
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* @param band Valor del pixel o clase a asignar
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* @param pos Posicion dentro de la clase. Ejemplo 0..63
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* @param value Valor a asignar
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*/
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public void setHistogramValueByPos(int band, int pos, long value) { |
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if (pos < 0) |
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pos = 0;
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if (pos >= nClasses)
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pos = nClasses - 1;
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table[band][pos] = value; |
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} |
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/**
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* Obtiene un valor del histograma
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* @param band N?mero de banda del valor a recuperar
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* @param px Pixel o valor de la clase del valor a recuperar
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* @return valor
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*/
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public double getHistogramValue(int band, double px) { |
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if (histogram == null) |
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getHistogram(); |
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for (int i = 0; i < histogram[band].length; i++) |
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if (((HistogramClass) histogram[band][i]).isIn(px))
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return ((HistogramClass) histogram[band][i]).getValue();
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return 0; |
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} |
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/**
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* Obtiene un valor del histograma segun la posicion dentro de las clases
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* @param band N?mero de banda del valor a recuperar
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* @param px Pixel o valor de la clase del valor a recuperar
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* @return valor
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*/
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public double getHistogramValueByPos(int band, int pos) { |
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if (pos < 0) |
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pos = 0;
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if (pos >= nClasses)
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pos = nClasses - 1;
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return table[band][pos];
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} |
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/**
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* Incrementa un valor de una posici?n del histograma
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* @param band N?mero de banda
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* @param px Pixel o valor de la clase
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*/
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public void incrementPxValue(int band, double px) { |
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if (Double.isNaN(px)) |
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return;
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if (noDataValue != null && noDataValue.isDefined()) { |
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switch (dataType) {
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case Buffer.TYPE_BYTE: |
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if(((byte)px) == noDataValue.getValue().byteValue()) |
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return;
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break;
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case Buffer.TYPE_SHORT: |
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if(((short)px) == noDataValue.getValue().shortValue()) |
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return;
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break;
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case Buffer.TYPE_INT: |
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if(((int)px) == noDataValue.getValue().intValue()) |
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return;
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break;
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case Buffer.TYPE_FLOAT: |
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if(((float)px) == noDataValue.getValue().floatValue()) |
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return;
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break;
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case Buffer.TYPE_DOUBLE: |
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if(((double)px) == noDataValue.getValue().doubleValue()) |
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return;
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break;
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} |
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} |
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int pos = (int) (((nClasses - 1) * (px - min[band])) / (max[band] - min[band])); |
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if (pos < 0) |
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pos = 0;
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if (pos >= nClasses)
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pos = nClasses - 1;
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table[band][pos]++; |
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} |
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/**
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* Calculo de estad?sticas a partir de un histograma. El resultado de la funci?n es un array
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* bidimensional donde el primer ?ndice inndica la estadistica y el segundo el n?mero de banda.
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*
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* <UL>
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* <LI>m?nimo</LI>
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* <LI>m?ximo</LI>
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* <LI>media</LI>
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* <LI>mediana</LI>
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* <LI>N?mero de pixels</LI>
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* </UL>
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* @param histogram
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* @param bandas solicitadas. Cada elemento del vector representa una banda. Si est? a true se calcula la
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* estadistica para esa banda y si est? a false no se calcular?.
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* @return
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*/
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public double[][] getBasicStats(boolean[] bands) { |
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if (histogram == null) |
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return null; |
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return getBasicStats(0, histogram[0].length - 1, bands); |
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} |
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|
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/**
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* Calculo de estad?sticas a partir de un histograma. El resultado de la funci?n es un array
|
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* bidimensional donde el primer ?ndice inndica la estadistica y el segundo el n?mero de banda.
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*
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* <UL>
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* <LI>m?nimo</LI>
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* <LI>m?ximo</LI>
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* <LI>media</LI>
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* <LI>mediana</LI>
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* <LI>N?mero de pixels</LI>
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* </UL>
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* @param histogram
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* @param beginPos Posici?n de inicio del histograma para contabilizar estadisticas
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* @param endPos Posici?n de fin del histograma para contabilizar estadisticas
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* @param bandas solicitadas. Cada elemento del vector representa una banda. Si est? a true se calcula la
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* estadistica para esa banda y si est? a false no se calcular?.
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* @return
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*/
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public double[][] getBasicStats(double beginPos2, double endPos2, boolean[] bands) { |
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if (histogram == null) |
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getHistogram(); |
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int beginPos = (int) ((beginPos2 * (nClasses - 1)) / 100.0); |
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int endPos = (int) ((endPos2 * (nClasses - 1)) / 100.0); |
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// Contamos el n?mero de bandas para las cuales se calcula la estad?stica
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int bandCount = 0; |
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for (int iBand = 0; iBand < bands.length; iBand++) |
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if (bands[iBand])
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bandCount++; |
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double[][] res = new double[5][]; |
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double[] average = new double[bandCount]; // Valor de pixel medio (Media) |
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double[] middle = new double[bandCount]; // Mediana |
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double[] nPixelsBand = new double[bandCount];// N?mero de pixels por banda |
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int showBandCounter = 0; // Contador de bandas de las que hay calcular la |
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// estadistica
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for (int iBand = 0; iBand < histogram.length; iBand++) { |
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if (bands[iBand]) {
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for (int i = beginPos; i <= endPos; i++) { |
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// Calculo del n?mero de pixeles
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nPixelsBand[showBandCounter] += histogram[iBand][i].getValue(); |
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average[showBandCounter] += histogram[iBand][i].getValue() * ((histogram[iBand][i].getMax() + histogram[iBand][i].getMin())/2);
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} |
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// Calculo de la media
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try {
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average[showBandCounter] /= nPixelsBand[showBandCounter]; |
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} catch (ArithmeticException exc) { |
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average[showBandCounter] = 0;
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} |
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// Calculo de mediana
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double stopPos = nPixelsBand[showBandCounter] / 2; |
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double aux = 0; |
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int i = beginPos;
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for (i = beginPos; aux <= stopPos; i++) {
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if (i >= histogram[iBand].length)
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break;
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try {
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aux += histogram[iBand][i].getValue(); |
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} catch (ArrayIndexOutOfBoundsException e) { |
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LoggerFactory.getLogger(getClass().getName()).debug("Acceso a un valor de histogram (Banda: " + iBand + " Posici?n: " + i + ") fuera de l?mites. (NBandas: " + histogram.length + " Valores:" + histogram[iBand].length + ")", e); |
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} |
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} |
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middle[showBandCounter] = (histogram[iBand][i - 1].getMax() + histogram[iBand][i - 1].getMin()) / 2; |
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showBandCounter++; |
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} |
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} |
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|
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res[0] = min;
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res[1] = max;
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res[2] = average;
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res[3] = middle;
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res[4] = nPixelsBand;
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return res;
|
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} |
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|
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/**
|
| 474 |
* Obtiene la tabla de valores
|
| 475 |
* @return
|
| 476 |
*/
|
| 477 |
public long[][] getTable() { |
| 478 |
return table;
|
| 479 |
} |
| 480 |
|
| 481 |
/*
|
| 482 |
* (non-Javadoc)
|
| 483 |
* @see org.gvsig.fmap.dal.coverage.datastruct.BufferHistogram#addTable(long[][])
|
| 484 |
*/
|
| 485 |
public void addTable(long[][] table) { |
| 486 |
if(this.table == null) { |
| 487 |
this.table = table;
|
| 488 |
return;
|
| 489 |
} |
| 490 |
long[][] newTable = new long[this.table.length + table.length][]; |
| 491 |
for (int i = 0; i < this.table.length; i++) { |
| 492 |
newTable[i] = this.table[i];
|
| 493 |
} |
| 494 |
for (int i = this.table.length; i < (this.table.length + table.length); i++) { |
| 495 |
newTable[i] = table[i]; |
| 496 |
} |
| 497 |
table = newTable; |
| 498 |
} |
| 499 |
|
| 500 |
/**
|
| 501 |
* Obtiene la tabla de valores normalizada. Divide todos los elementos por el n?mero de
|
| 502 |
* pixeles total.
|
| 503 |
* @return tabla de valores normalizada
|
| 504 |
*/
|
| 505 |
public static double[][] convertToNormalizeHistogram(long[][] tableToConvert) { |
| 506 |
long[] nValues = new long[tableToConvert.length]; |
| 507 |
for (int i = 0; i < tableToConvert.length; i++) |
| 508 |
for (int j = 0; j < tableToConvert[i].length; j++) |
| 509 |
nValues[i] += tableToConvert[i][j]; |
| 510 |
|
| 511 |
double[][] res = new double[tableToConvert.length][tableToConvert[0].length]; |
| 512 |
for (int i = 0; i < tableToConvert.length; i++) |
| 513 |
for (int j = 0; j < tableToConvert[i].length; j++) |
| 514 |
res[i][j] = (double)((double)tableToConvert[i][j] / (double)nValues[i]); |
| 515 |
|
| 516 |
return res;
|
| 517 |
} |
| 518 |
|
| 519 |
/**
|
| 520 |
* Obtiene la tabla de valores normalizada y acumulada. Divide todos los elementos por el n?mero de
|
| 521 |
* pixeles total.
|
| 522 |
* @return tabla de valores normalizada
|
| 523 |
*/
|
| 524 |
public static double[][] convertTableToNormalizeAccumulate(long[][] tableToConvert) { |
| 525 |
double[][] res = convertToNormalizeHistogram(tableToConvert); |
| 526 |
for (int i = 0; i < tableToConvert.length; i++) |
| 527 |
for (int j = 0; j < tableToConvert[i].length; j++) |
| 528 |
if(j > 0) |
| 529 |
res[i][j] += res[i][j - 1];
|
| 530 |
|
| 531 |
return res;
|
| 532 |
} |
| 533 |
|
| 534 |
/**
|
| 535 |
* Obtiene el histograma de la imagen negativa.
|
| 536 |
* @return long[][]
|
| 537 |
*/
|
| 538 |
public long[][] getNegativeTable() { |
| 539 |
long[][] tableNeg = new long[table.length][table[0].length]; |
| 540 |
for (int i = 0; i < tableNeg.length; i++) |
| 541 |
for (int j = 0; j < tableNeg[i].length; j++) |
| 542 |
tableNeg[i][table[i].length - j - 1] = table[i][j];
|
| 543 |
return tableNeg;
|
| 544 |
} |
| 545 |
|
| 546 |
/**
|
| 547 |
* Convierte un histograma al rango de valores de RGB, en pocas palabras
|
| 548 |
* aplica una operacion 0xff a cada pixel para quitar los numeros negativos
|
| 549 |
* y desplazarlos a su rango visual.
|
| 550 |
* @param histogram
|
| 551 |
*/
|
| 552 |
public static BufferHistogram convertHistogramToRGB(BufferHistogram histogram) { |
| 553 |
if (histogram == null) |
| 554 |
return null; |
| 555 |
|
| 556 |
if (histogram.getDataType() != Buffer.TYPE_BYTE) |
| 557 |
return histogram;
|
| 558 |
|
| 559 |
double min = histogram.getMin(0); |
| 560 |
double max = histogram.getMax(0); |
| 561 |
|
| 562 |
long table2[][] = histogram.getTable(); |
| 563 |
|
| 564 |
long newTable[][] = new long[table2.length][table2[0].length]; |
| 565 |
|
| 566 |
// Ponemos a cero todos los valores
|
| 567 |
for (int i = 0; i < table2.length; i++) |
| 568 |
for (int j = 0; j < table2[i].length; j++) |
| 569 |
newTable[i][j] = 0;
|
| 570 |
|
| 571 |
// Sumamos en la posicion calculada nueva el valor correspondiente
|
| 572 |
for (int i = 0; i < table2.length; i++) { |
| 573 |
for (int j = 0; j < table2[i].length; j++) { |
| 574 |
double val = ((j * (max - min)) / 255) + min; |
| 575 |
int pos = ((int) val) & 0xff; |
| 576 |
if (pos < 0) |
| 577 |
pos = 0;
|
| 578 |
if (pos >= newTable[i].length)
|
| 579 |
pos = newTable[i].length - 1;
|
| 580 |
|
| 581 |
newTable[i][pos] += table2[i][j]; |
| 582 |
} |
| 583 |
} |
| 584 |
|
| 585 |
double mins[] = new double[histogram.getNumBands()]; |
| 586 |
double maxs[] = new double[histogram.getNumBands()]; |
| 587 |
|
| 588 |
for (int i = 0; i < mins.length; i++) { |
| 589 |
mins[i] = 0;
|
| 590 |
maxs[i] = 255;
|
| 591 |
} |
| 592 |
|
| 593 |
BufferHistogramImpl histogramNew = new BufferHistogramImpl(histogram.getNumBands(), mins, maxs, Buffer.TYPE_BYTE); |
| 594 |
|
| 595 |
histogramNew.setTable(newTable); |
| 596 |
|
| 597 |
return histogramNew;
|
| 598 |
} |
| 599 |
|
| 600 |
/**
|
| 601 |
* @param noDataValue the noDataValue to set
|
| 602 |
*/
|
| 603 |
public void setNoDataValue(NoData noDataValue) { |
| 604 |
this.noDataValue = noDataValue;
|
| 605 |
} |
| 606 |
} |