svn-gvsig-desktop / tags / v1_1_Build_1011 / libraries / libCq_CMS_praster / src / org / cresques / io / datastruct / Statistic.java @ 12904
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/*
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* Cresques Mapping Suite. Graphic Library for constructing mapping applications.
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*
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* Copyright (C) 2004-5.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* cresques@gmail.com
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*/
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package org.cresques.io.datastruct; |
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import java.util.ArrayList; |
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/**
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* Clase para estadisticas
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* @author Luis W. Sevilla (sevilla_lui@gva.es)
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*/
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public class Statistic { |
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/**
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* M?nimo valor de pixel por banda
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*/
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public double[] minBandValue = { |
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Double.MAX_VALUE, Double.MAX_VALUE, |
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Double.MAX_VALUE
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}; |
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/**
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* M?ximo valor de pixel por banda
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*/
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public double[] maxBandValue = { |
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Double.MIN_VALUE, Double.MIN_VALUE, |
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Double.MIN_VALUE
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}; |
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/**
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* Segundo valor m?s peque?o de pixel por banda
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*/
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public double[] secondMinBandValue = { |
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Double.MAX_VALUE, Double.MAX_VALUE, |
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Double.MAX_VALUE
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}; |
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/**
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* Segundo valor m?s grande de pixel por banda
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*/
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public double[] secondMaxBandValue = { |
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Double.MIN_VALUE, Double.MIN_VALUE, |
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Double.MIN_VALUE
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}; |
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/**
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* Historial de valores para una imagen. Esto se usa cuando se solicita varias
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* veces para una misma imagen solo tenga que calcular los valores una vez
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*/
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public ArrayList history = new ArrayList(); |
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/**
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* Porcentaje de recorte de colas
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*/
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public double tailPercent = 0D; |
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/**
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* Constructor
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*/
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public Statistic() {
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super();
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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 static long[][] getBasicStatsFromHistogram(int[][] histogram, boolean[] bands){ |
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if(histogram == null) |
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return null; |
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return getBasicStatsFromHistogram(histogram, 0, histogram[0].length - 1, bands); |
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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 static long[][] getBasicStatsFromHistogram(int[][] histogram, int beginPos, int endPos, boolean[] bands){ |
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if(histogram == null) |
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return null; |
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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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int values = 5; |
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long[][] res = new long[values][]; |
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long[] min = new long[bandCount];//M?nimo |
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long[] max = new long[bandCount];//M?ximo |
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for(int iBand = 0; iBand < bandCount; iBand ++){ |
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max[iBand] = beginPos; |
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min[iBand] = endPos; |
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} |
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long[] average = new long[bandCount]; //Valor de pixel medio (Media) |
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long[] middle = new long[bandCount]; //Mediana |
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long[] nPixelsBand = new long[bandCount];//N?mero de pixels por banda |
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int showBandCounter = 0; //Contador de bandas de las que hay calcular la estadistica |
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for(int iBand = 0; iBand < histogram.length; iBand ++){ |
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if(bands[iBand]){
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int pixels = 0; //N?mero de valores por banda (entre 0 y 255) |
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for(int i = beginPos; i <= endPos; i ++){ |
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//Calculo del m?nimo
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if(histogram[iBand][i] != 0 && i < min[showBandCounter]) |
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min[showBandCounter] = i; |
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//Calculo del m?ximo
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if(histogram[iBand][i] != 0 && i > max[showBandCounter]) |
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max[showBandCounter] = i; |
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//Calculo del n?mero de pixeles
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nPixelsBand[showBandCounter] += (long)histogram[iBand][i];
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if(histogram[iBand][i] != 0) |
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pixels ++; |
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average[showBandCounter] += histogram[iBand][i] * i; |
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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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long middlePos = nPixelsBand[showBandCounter] >> 1; |
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int aux = 0; |
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int i = beginPos;
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for(i = beginPos; aux < middlePos; i++)
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aux += histogram[iBand][i]; |
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middle[showBandCounter] = i - 1;
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showBandCounter ++; |
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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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* Clase que contiene los valores calculados para una imagen.
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* Esto se usa cuando se solicita varias veces para una misma imagen solo
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* tenga que calcular los valores una vez.
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* @author Nacho Brodin (brodin_ign@gva.es)
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*/
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public class History { |
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public String file = null; |
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public double[] min = null; |
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public double[] max = null; |
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public double[] secMin = null; |
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public double[] secMax = null; |
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public History(String file, double[] min, double[] max, double[] secMin, |
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double[] secMax) { |
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this.file = file;
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this.min = (double[]) min.clone(); |
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this.max = (double[]) max.clone(); |
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this.secMin = (double[]) secMin.clone(); |
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this.secMax = (double[]) secMax.clone(); |
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} |
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} |
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} |