root / trunk / libraries / libRaster / src / org / gvsig / raster / util / Histogram.java @ 11185
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| 1 | 10939 | nacho | /* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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| 2 | *
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| 3 | * Copyright (C) 2007 IVER T.I. and Generalitat Valenciana.
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| 4 | *
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| 5 | * This program is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU General Public License
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| 7 | * as published by the Free Software Foundation; either version 2
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| 8 | * of the License, or (at your option) any later version.
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| 9 | *
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| 10 | * This program is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | * GNU General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU General Public License
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| 16 | * along with this program; if not, write to the Free Software
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| 17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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| 18 | */
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| 19 | package org.gvsig.raster.util; |
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| 20 | |||
| 21 | 11113 | nacho | |
| 22 | 10939 | nacho | /**
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| 23 | * Representa un histograma.
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| 24 | * @version 27/03/2007
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| 25 | * @author Nacho Brodin (nachobrodin@gmail.com)
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| 26 | 11076 | nacho | *
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| 27 | 10939 | nacho | */
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| 28 | public class Histogram { |
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| 29 | 11113 | nacho | private HistogramClass[][] histogram = null; |
| 30 | private int nClasses = 0; |
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| 31 | |||
| 32 | 11185 | bsanchez | private long[][] table = null; |
| 33 | 10939 | nacho | private static String[] types = {"normal", "accumulated", "logaritmic"}; |
| 34 | 11185 | bsanchez | private double min = Double.MAX_VALUE; |
| 35 | private double max = Double.MIN_VALUE; |
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| 36 | 10939 | nacho | |
| 37 | /**
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| 38 | * Constructor
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| 39 | */
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| 40 | 11185 | bsanchez | public Histogram(int nBands, int nClasses, double min, double max) { |
| 41 | table = new long[nBands][nClasses]; |
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| 42 | for (int i=0; i < table.length; i++) |
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| 43 | for (int j=0; j < table[0].length; j++) |
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| 44 | table[i][j] = 0;
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| 45 | this.min = min;
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| 46 | this.max = max;
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| 47 | 11113 | nacho | this.nClasses = nClasses;
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| 48 | 10939 | nacho | } |
| 49 | 11113 | nacho | |
| 50 | 10939 | nacho | /**
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| 51 | * Obtiene el histograma sin modificar
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| 52 | * @return array bidimensional donde el primer elemento es el valor del pixel
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| 53 | * o rango y el segundo el n?mero de elementos que aparecen.
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| 54 | */
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| 55 | 11113 | nacho | public HistogramClass[][] getHistogram() { |
| 56 | 11185 | bsanchez | if (nClasses <= 0) |
| 57 | 11113 | nacho | return null; |
| 58 | |||
| 59 | 11185 | bsanchez | histogram = new HistogramClass[table.length][nClasses];
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| 60 | 11113 | nacho | |
| 61 | 11185 | bsanchez | for (int i = 0; i < table.length; i++) { |
| 62 | 11113 | nacho | for (int j = 0; j < nClasses; j++) { |
| 63 | 11185 | bsanchez | HistogramClass hc = new HistogramClass(min + ((j*(max-min))/nClasses), min + (((j+1)*(max-min))/nClasses)); |
| 64 | hc.setValue(table[i][j]); |
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| 65 | 11113 | nacho | histogram[i][j] = hc; |
| 66 | } |
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| 67 | } |
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| 68 | 10939 | nacho | return histogram;
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| 69 | } |
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| 70 | |||
| 71 | /**
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| 72 | * Obtiene el n?mero de bandas del histograma
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| 73 | * @return entero que representa el n?mero de bandas
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| 74 | */
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| 75 | public int getNumBands() { |
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| 76 | 11185 | bsanchez | if (table != null) |
| 77 | return table.length;
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| 78 | 10939 | nacho | return 0; |
| 79 | } |
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| 80 | |||
| 81 | /**
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| 82 | * Obtiene la longitud (n?mero de valores) de una banda determinada
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| 83 | * @param band Banda o obtener la longitud
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| 84 | * @return entero con la longitud de la banda
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| 85 | 11185 | bsanchez | * rangos de valores y DataclassList.
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| 86 | 10939 | nacho | */
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| 87 | public int getBandLenght(int band) { |
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| 88 | 11185 | bsanchez | if (table != null) |
| 89 | return table[band].length;
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| 90 | 10939 | nacho | return 0; |
| 91 | } |
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| 92 | |||
| 93 | /**
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| 94 | * Obtiene el n?mero de valores o clases del histograma
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| 95 | * @return entero que representa el n?mero de valores o clases del histograma
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| 96 | */
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| 97 | public int getNumValues() { |
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| 98 | 11113 | nacho | return nClasses;
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| 99 | 10939 | nacho | } |
| 100 | |||
| 101 | /**
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| 102 | * Asigna un histograma
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| 103 | * @param hist histograma asignado
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| 104 | */
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| 105 | 11113 | nacho | public void setHistogram(HistogramClass[][] hist){ |
| 106 | 10939 | nacho | histogram = hist; |
| 107 | } |
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| 108 | |||
| 109 | /**
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| 110 | 11113 | nacho | * Asigna un valor para una posici?n del histograma
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| 111 | * @param band Valor del pixel o clase a asignar
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| 112 | 10939 | nacho | * @param px Valor del pixel
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| 113 | * @param value Valor a asignar
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| 114 | */
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| 115 | 11113 | nacho | public void setHistogramValue(int band, double px, long value) { |
| 116 | 11185 | bsanchez | int pos = (int) ((nClasses * (px - min))/(max-min)); |
| 117 | if (pos < 0) pos = 0; |
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| 118 | if (pos >= nClasses) pos = nClasses - 1; |
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| 119 | table[band][pos] = value; |
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| 120 | 10939 | nacho | } |
| 121 | |||
| 122 | /**
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| 123 | 11185 | bsanchez | * Asigna un valor para una posici?n del histograma segun la posicion en las
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| 124 | * clases
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| 125 | * @param band Valor del pixel o clase a asignar
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| 126 | * @param pos Posicion dentro de la clase. Ejemplo 0..63
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| 127 | * @param value Valor a asignar
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| 128 | */
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| 129 | public void setHistogramValueByPos(int band, int pos, long value) { |
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| 130 | if (pos < 0) pos = 0; |
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| 131 | if (pos >= nClasses) pos = nClasses - 1; |
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| 132 | table[band][pos] = value; |
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| 133 | } |
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| 134 | |||
| 135 | /**
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| 136 | 10939 | nacho | * Obtiene un valor del histograma
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| 137 | * @param band N?mero de banda del valor a recuperar
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| 138 | * @param px Pixel o valor de la clase del valor a recuperar
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| 139 | * @return valor
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| 140 | */
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| 141 | 11185 | bsanchez | public double getHistogramValue(int band, double px) { |
| 142 | if (histogram == null) getHistogram(); |
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| 143 | 11113 | nacho | for (int i = 0; i < histogram[band].length; i++) { |
| 144 | 11185 | bsanchez | if (((HistogramClass)histogram[band][i]).isIn(px))
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| 145 | return ((HistogramClass)histogram[band][i]).getValue();
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| 146 | 11113 | nacho | } |
| 147 | return 0; |
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| 148 | 10939 | nacho | } |
| 149 | |||
| 150 | 11185 | bsanchez | /**
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| 151 | * Obtiene un valor del histograma segun la posicion dentro de las clases
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| 152 | * @param band N?mero de banda del valor a recuperar
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| 153 | * @param px Pixel o valor de la clase del valor a recuperar
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| 154 | * @return valor
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| 155 | */
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| 156 | public double getHistogramValueByPos(int band, int pos) { |
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| 157 | if (pos < 0) pos = 0; |
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| 158 | if (pos >= nClasses) pos = nClasses - 1; |
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| 159 | return table[band][pos];
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| 160 | } |
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| 161 | 11113 | nacho | |
| 162 | 10939 | nacho | /**
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| 163 | * Incrementa un valor de una posici?n del histograma
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| 164 | * @param band N?mero de banda
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| 165 | * @param px Pixel o valor de la clase
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| 166 | */
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| 167 | 11113 | nacho | public void incrementPxValue(int band, double px) { |
| 168 | 11185 | bsanchez | int pos = (int) ((nClasses * (px - min))/(max-min)); |
| 169 | if (pos < 0) pos = 0; |
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| 170 | if (pos >= nClasses) pos = nClasses - 1; |
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| 171 | table[band][pos]++; |
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| 172 | 10939 | nacho | } |
| 173 | |||
| 174 | /**
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| 175 | * Devuelve el histograma acumulado
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| 176 | * @return
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| 177 | */
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| 178 | 11113 | nacho | public HistogramClass[][] getAccumulatedHistogram() { |
| 179 | 11185 | bsanchez | if (histogram != null) { |
| 180 | HistogramClass[][] hist = new HistogramClass[histogram.length][histogram[0].length]; |
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| 181 | 10939 | nacho | for (int iBand = 0; iBand < hist.length; iBand++) { |
| 182 | 11185 | bsanchez | hist[iBand][0] = new HistogramClass(histogram[iBand][0].getMin(), histogram[iBand][0].getMax()); |
| 183 | hist[iBand][0].setValue(histogram[iBand][0].getValue()); |
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| 184 | 11080 | nacho | for (int j = 1; j < hist[iBand].length; j++) { |
| 185 | 11185 | bsanchez | hist[iBand][j] = new HistogramClass(histogram[iBand][j].getMin(), histogram[iBand][j].getMax());
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| 186 | hist[iBand][j].setValue(hist[iBand][j - 1].getValue() + histogram[iBand][j].getValue());
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| 187 | 10939 | nacho | } |
| 188 | } |
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| 189 | 11080 | nacho | return hist;
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| 190 | 10939 | nacho | } |
| 191 | 11185 | bsanchez | return null; |
| 192 | 10939 | nacho | } |
| 193 | |||
| 194 | /**
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| 195 | 11080 | nacho | * Devuelve el histograma logaritmico
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| 196 | 10939 | nacho | * @return
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| 197 | */
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| 198 | 11113 | nacho | public HistogramClass[][] getLogaritmicHistogram() { |
| 199 | 11185 | bsanchez | if (histogram != null) { |
| 200 | HistogramClass[][] hist = new HistogramClass[histogram.length][histogram[0].length]; |
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| 201 | double minim = Double.MAX_VALUE; |
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| 202 | 11080 | nacho | for (int iBand = 0; iBand < histogram.length; iBand++) { |
| 203 | 11185 | bsanchez | for (int j = 0; j < histogram[iBand].length; j++) { |
| 204 | if (minim > histogram[iBand][j].getValue())
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| 205 | minim = histogram[iBand][j].getValue(); |
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| 206 | } |
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| 207 | 11080 | nacho | } |
| 208 | 11185 | bsanchez | for (int iBand = 0; iBand < histogram.length; iBand++) { |
| 209 | for (int j = 0; j < histogram[iBand].length; j++) { |
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| 210 | hist[iBand][j] = new HistogramClass(histogram[iBand][j].getMin(), histogram[iBand][j].getMax());
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| 211 | hist[iBand][j].setValue(java.lang.Math.log(histogram[iBand][j].getValue() - minim + 1.0));
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| 212 | } |
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| 213 | } |
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| 214 | 11080 | nacho | return hist;
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| 215 | } |
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| 216 | 11185 | bsanchez | return null; |
| 217 | |||
| 218 | 10939 | nacho | } |
| 219 | |||
| 220 | /**
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| 221 | * N?mero de tipos de histograma definidos en esta clase.
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| 222 | * @return entero con el n?mero de tipos definidos.
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| 223 | */
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| 224 | 11080 | nacho | public static int getHistogramTypesCount() { |
| 225 | 10939 | nacho | return types.length;
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| 226 | } |
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| 227 | |||
| 228 | /**
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| 229 | * Obtiene un tipo de histograma a partir de su posici?n en el array
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| 230 | * @param pos posici?n en el array del tipo a obtener
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| 231 | * @return Tipo
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| 232 | */
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| 233 | 11080 | nacho | public static String getType(int pos) { |
| 234 | 10939 | nacho | return types[pos];
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| 235 | } |
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| 236 | |||
| 237 | 10943 | nacho | /**
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| 238 | * Obtiene el histograma correspondiente al tipo pasado por par?metro. Los tipos
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| 239 | * est?n definidos en esta misma clase de forma est?tica en la variable types.
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| 240 | * @param type Tipo a devolver
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| 241 | * @return Histograma
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| 242 | */
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| 243 | 11113 | nacho | public HistogramClass[][] getHistogramByType(String type) { |
| 244 | 10943 | nacho | if(type.equals(types[0])) |
| 245 | return getHistogram();
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| 246 | if(type.equals(types[1])) |
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| 247 | return getAccumulatedHistogram();
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| 248 | if(type.equals(types[2])) |
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| 249 | return getLogaritmicHistogram();
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| 250 | return null; |
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| 251 | } |
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| 252 | 10973 | nacho | |
| 253 | 11080 | nacho | /**
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| 254 | * Calculo de estad?sticas a partir de un histograma. El resultado de la funci?n es un array
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| 255 | * bidimensional donde el primer ?ndice inndica la estadistica y el segundo el n?mero de banda.
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| 256 | *
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| 257 | * <UL>
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| 258 | * <LI>m?nimo</LI>
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| 259 | * <LI>m?ximo</LI>
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| 260 | * <LI>media</LI>
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| 261 | * <LI>mediana</LI>
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| 262 | * <LI>N?mero de pixels</LI>
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| 263 | * </UL>
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| 264 | * @param histogram
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| 265 | * @param bandas solicitadas. Cada elemento del vector representa una banda. Si est? a true se calcula la
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| 266 | * estadistica para esa banda y si est? a false no se calcular?.
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| 267 | * @return
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| 268 | */
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| 269 | public long[][] getBasicStats(boolean[] bands) { |
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| 270 | 11185 | bsanchez | if (histogram == null) |
| 271 | 11080 | nacho | return null; |
| 272 | return getBasicStats(0, histogram[0].length - 1, bands); |
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| 273 | } |
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| 274 | |||
| 275 | /**
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| 276 | * Calculo de estad?sticas a partir de un histograma. El resultado de la funci?n es un array
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| 277 | * bidimensional donde el primer ?ndice inndica la estadistica y el segundo el n?mero de banda.
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| 278 | *
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| 279 | * <UL>
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| 280 | * <LI>m?nimo</LI>
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| 281 | * <LI>m?ximo</LI>
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| 282 | * <LI>media</LI>
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| 283 | * <LI>mediana</LI>
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| 284 | * <LI>N?mero de pixels</LI>
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| 285 | * </UL>
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| 286 | * @param histogram
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| 287 | * @param beginPos Posici?n de inicio del histograma para contabilizar estadisticas
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| 288 | * @param endPos Posici?n de fin del histograma para contabilizar estadisticas
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| 289 | * @param bandas solicitadas. Cada elemento del vector representa una banda. Si est? a true se calcula la
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| 290 | * estadistica para esa banda y si est? a false no se calcular?.
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| 291 | * @return
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| 292 | */
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| 293 | 11185 | bsanchez | public long[][] getBasicStats(int beginPos2, int endPos2, boolean[] bands){ |
| 294 | if (histogram == null) getHistogram(); |
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| 295 | 11080 | nacho | |
| 296 | 11185 | bsanchez | // Preparar las posiciones para los rangos de los HistogramClass
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| 297 | int beginPos = (int) ((nClasses * (beginPos2 - min)) / (max - min)); |
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| 298 | if (beginPos < 0) beginPos = 0; |
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| 299 | if (beginPos >= nClasses) beginPos = nClasses - 1; |
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| 300 | int endPos = (int) ((nClasses * (endPos2 - min)) / (max - min)); |
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| 301 | if (endPos < 0) endPos = 0; |
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| 302 | if (endPos >= nClasses) endPos = nClasses - 1; |
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| 303 | |||
| 304 | 11080 | nacho | //Contamos el n?mero de bandas para las cuales se calcula la estad?stica
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| 305 | 11185 | bsanchez | int bandCount = 0; |
| 306 | for (int iBand = 0; iBand < bands.length; iBand ++) |
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| 307 | if (bands[iBand]) bandCount ++;
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| 308 | 11080 | nacho | |
| 309 | int values = 5; |
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| 310 | long[][] res = new long[values][]; |
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| 311 | |||
| 312 | long[] min = new long[bandCount];//M?nimo |
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| 313 | long[] max = new long[bandCount];//M?ximo |
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| 314 | 11185 | bsanchez | for (int iBand = 0; iBand < bandCount; iBand ++) { |
| 315 | 11080 | nacho | max[iBand] = beginPos; |
| 316 | min[iBand] = endPos; |
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| 317 | } |
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| 318 | long[] average = new long[bandCount]; //Valor de pixel medio (Media) |
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| 319 | long[] middle = new long[bandCount]; //Mediana |
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| 320 | long[] nPixelsBand = new long[bandCount];//N?mero de pixels por banda |
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| 321 | |||
| 322 | int showBandCounter = 0; //Contador de bandas de las que hay calcular la estadistica |
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| 323 | 11185 | bsanchez | for (int iBand = 0; iBand < histogram.length; iBand ++){ |
| 324 | 11080 | nacho | if(bands[iBand]){
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| 325 | int pixels = 0; //N?mero de valores por banda (entre 0 y 255) |
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| 326 | for(int i = beginPos; i <= endPos; i ++){ |
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| 327 | 10973 | nacho | |
| 328 | 11080 | nacho | //Calculo del m?nimo
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| 329 | 11185 | bsanchez | if(histogram[iBand][i].getValue() != 0 && i < min[showBandCounter]) |
| 330 | 11080 | nacho | min[showBandCounter] = i; |
| 331 | 10973 | nacho | |
| 332 | 11080 | nacho | //Calculo del m?ximo
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| 333 | 11185 | bsanchez | if(histogram[iBand][i].getValue() != 0 && i > max[showBandCounter]) |
| 334 | 11080 | nacho | max[showBandCounter] = i; |
| 335 | |||
| 336 | //Calculo del n?mero de pixeles
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| 337 | 11185 | bsanchez | nPixelsBand[showBandCounter] += (long)histogram[iBand][i].getValue();
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| 338 | 11080 | nacho | |
| 339 | 11185 | bsanchez | if(histogram[iBand][i].getValue() != 0) |
| 340 | 11080 | nacho | pixels ++; |
| 341 | |||
| 342 | 11185 | bsanchez | average[showBandCounter] += histogram[iBand][i].getValue() * i; |
| 343 | 11080 | nacho | } |
| 344 | //Calculo de la media
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| 345 | try{
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| 346 | average[showBandCounter] /= nPixelsBand[showBandCounter]; |
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| 347 | }catch(ArithmeticException exc){ |
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| 348 | average[showBandCounter] = 0;
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| 349 | } |
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| 350 | |||
| 351 | //Calculo de mediana
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| 352 | long middlePos = nPixelsBand[showBandCounter] >> 1; |
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| 353 | int aux = 0; |
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| 354 | int i = beginPos;
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| 355 | for(i = beginPos; aux < middlePos; i++)
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| 356 | 11185 | bsanchez | aux += histogram[iBand][i].getValue(); |
| 357 | 11080 | nacho | middle[showBandCounter] = i - 1;
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| 358 | |||
| 359 | showBandCounter ++; |
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| 360 | } |
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| 361 | } |
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| 362 | |||
| 363 | res[0] = min;
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| 364 | res[1] = max;
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| 365 | res[2] = average;
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| 366 | res[3] = middle;
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| 367 | res[4] = nPixelsBand;
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| 368 | 11185 | bsanchez | return res;
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| 369 | 11080 | nacho | } |
| 370 | } |