root / trunk / libraries / libRaster / src / org / gvsig / raster / grid / filter / statistics / TailTrimFilter.java @ 11067
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2006 IVER T.I. and Generalitat Valenciana.
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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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package org.gvsig.raster.grid.filter.statistics; |
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import java.util.Arrays; |
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import org.gvsig.raster.dataset.IBuffer; |
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import org.gvsig.raster.dataset.IStatistics; |
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import org.gvsig.raster.grid.filter.RasterFilter; |
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/**
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* Filtro de recorte de colas. Este filtro toma pixels de la imagen (todos o algunas muestras
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* dependiendo de la variable percentSample) y los ordena. Recorta un porcentaje controlado
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* por tailPercenten ambos extremos del vector ordenado. El nuevo m?ximo y m?nimo coinciden
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* con el valor de la posici?n del vector recortado. Por arriba para el m?ximo y por abajo
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* para el m?nimo.
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* El execute de este filtro no recorre toda la imagen sino que lo
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* hace en funci?n del porcentaje de muestras que quieren tomarse y
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* calculando a partir de este porcentaje un incremento.
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*/
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public abstract class TailTrimFilter extends RasterFilter { |
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public static String genericName = "tailTrim"; |
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protected int count = 0; |
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protected int tailSize = 0; |
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protected int nSamples = 0; |
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protected boolean removeMaxValue = false; |
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protected int incX , incY; |
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//Par?metros del filtro
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protected double tailPercent = 0D; |
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public double percentSamples = 0D; |
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protected int[][] sample = null; |
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protected double[][] sampleDec = null; |
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protected IStatistics stats = null; |
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/**
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* Array con el resultado. La primera dimensi?n es el n?mero de bandas y la segunda son dos elementos
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* el m?ximo y el m?nimo para esa banda.
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*/
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protected double[][] result = null; |
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public TailTrimFilter() {
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super();
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super.fName = genericName;
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this.fPriority = 20; |
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} |
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/**
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* Calcula el incremento de X y de Y para la toma de muestras en el calculo de
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* valores para el recorte
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*/
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public void pre() { |
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raster = (IBuffer) params.get("raster");
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height = raster.getHeight(); |
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width = raster.getWidth(); |
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tailPercent = ((Double) params.get("tail")).doubleValue(); |
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percentSamples = ((Double) params.get("samples")).doubleValue(); |
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removeMaxValue = ((Boolean) params.get("remove")).booleanValue(); |
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stats = ((IStatistics) params.get("stats"));
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if (exec) {
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count = 0;
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if (this.percentSamples == 0) { //Se toman todos los pixeles de la imagen |
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nSamples = height * width; |
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tailSize = (int) Math.round(this.tailPercent * nSamples); |
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} else { //Se toma un porcentaje de pixeles de la imagen para el calculo |
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incX = (int) Math.round(width / (int) Math.round(this.percentSamples * width)); |
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incY = (int) Math.round(height / (int) Math.round(this.percentSamples * height)); |
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nSamples = (int) ((Math.round(width / incX) + 1) * (Math.round(height / incY) + 1)); |
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tailSize = (int) (nSamples * this.tailPercent); |
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} |
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} |
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} |
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protected int posInit = 0; |
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protected int posFin = 0; |
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/**
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* Ordena las muestras , recorta y asigna m?ximo y m?nimo dependiendo del porcentaje
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* de recorte
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*/
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public void post() { |
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if (exec) {
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//Ordenamos los vectores
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if(sample != null){ |
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posInit = 0;
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posFin = sample[0].length - 1; |
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for (int i = 0; i < raster.getBandCount(); i++) |
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Arrays.sort(sample[i]);
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}else{
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posInit = 0;
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posFin = sampleDec[0].length - 1; |
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for (int i = 0; i < raster.getBandCount(); i++) |
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Arrays.sort(sampleDec[i]);
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} |
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//Si est? marcada la opci?n removeMaxValue se calcula la posici?n en la que el m?ximo valor
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//y el m?nimo ya no estan, teniendo as? un subconjunto del vector que elimina estos valores
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if (removeMaxValue) {
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if(sample != null) |
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this.calcPosInitEnd();
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if(sampleDec != null) |
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this.calcPosInitEndDec();
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} |
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//Calculamos de nuevo el n?mero de muestras ya que hemos quitado los valores m?ximo y m?nimo
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nSamples = posFin - posInit; |
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//Como ha podido cambiar nSamples recalculamos tailsize
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tailSize = (int) (nSamples * this.tailPercent); |
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} |
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} |
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/**
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* Calcula la posici?n de inicio y final donde el m?ximo y el m?nimo ya no est?n
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* para valores enteros.
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*/
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private void calcPosInitEnd(){ |
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for (int i = 0; i < sample[0].length; i++) { |
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for(int iBand = 0; iBand < raster.getBandCount(); iBand ++){ |
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if (sample[iBand][i] != sample[iBand][0]){ |
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posInit = i; |
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break;
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} |
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} |
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if(posInit != 0) |
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break;
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} |
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for (int i = sample[0].length - 1; i > 0; i--) { |
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for(int iBand = 0; iBand < raster.getBandCount(); iBand ++){ |
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if (sample[0][i] != sample[0][sample[0].length - 1]){ |
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posFin = i; |
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break;
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} |
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} |
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if(posFin != sample[0].length - 1) |
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break;
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} |
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} |
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/**
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* Calcula la posici?n de inicio y final donde el m?ximo y el m?nimo ya no est?n
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* para valores decimal.
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*/
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private void calcPosInitEndDec(){ |
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for (int i = 0; i < sampleDec[0].length; i++) { |
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for(int iBand = 0; iBand < raster.getBandCount(); iBand ++){ |
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if (sampleDec[iBand][i] != sampleDec[iBand][0]){ |
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posInit = i; |
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break;
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} |
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} |
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if(posInit != 0) |
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break;
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} |
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for (int i = sampleDec[0].length - 1; i > 0; i--) { |
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for(int iBand = 0; iBand < raster.getBandCount(); iBand ++){ |
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if (sampleDec[0][i] != sampleDec[0][sampleDec[0].length - 1]){ |
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posFin = i; |
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break;
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} |
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} |
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if(posFin != sampleDec[0].length - 1) |
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break;
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} |
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} |
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/**
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* Obtiene el porcentaje de recorte
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* @return porcentaje de recorte
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*/
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public double getTailPercent() { |
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return tailPercent;
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} |
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/**
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* Devuelve true si se eliminan los extremos de la serie antes del calculo del recorte de colas
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* o false si no se eliminan.
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* @return
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*/
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public boolean removeMaxValue() { |
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return this.removeMaxValue; |
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} |
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} |