root / trunk / libraries / libRaster / src / org / gvsig / raster / grid / filter / enhancement / EcualizationFilter.java @ 19491
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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.enhancement; |
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import org.gvsig.raster.buffer.RasterBuffer; |
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import org.gvsig.raster.dataset.FileNotOpenException; |
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import org.gvsig.raster.dataset.IBuffer; |
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import org.gvsig.raster.dataset.Params; |
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import org.gvsig.raster.dataset.io.RasterDriverException; |
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import org.gvsig.raster.dataset.properties.DatasetListStatistics; |
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import org.gvsig.raster.datastruct.Histogram; |
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import org.gvsig.raster.datastruct.HistogramException; |
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import org.gvsig.raster.grid.filter.RasterFilter; |
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/**
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* Clase base para los filtros de ecualizaci?n de histograma.
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*
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* @version 31/05/2007
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*/
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public class EcualizationFilter extends RasterFilter { |
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protected DatasetListStatistics stats = null; |
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protected double[] minBandValue = null; |
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protected double[] maxBandValue = null; |
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protected int nbands = 3; |
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protected int[] renderBands = null; |
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protected int[] k = null; |
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public static String[] names = new String[] {"ecualization"}; |
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protected Histogram histogram = null; |
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protected long nPixels = 0; |
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protected int[][] resValues = null; |
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protected long[][] lahe = null; |
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protected long[][] laheNegative = null; |
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protected int nElements = 0; |
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protected int[] ecualizedBands = null; |
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/**
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* Construye un LinearEnhancementFilter
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*/
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public EcualizationFilter() {
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setName(names[0]);
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.RasterFilter#pre()
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*/
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public void pre() { |
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raster = (IBuffer) params.get("raster");
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stats = (DatasetListStatistics) params.get("stats");
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histogram = (Histogram) params.get("histogram");
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if(histogram == null) |
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return;
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renderBands = (int[]) params.get("renderBands"); |
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if(renderBands != null && renderBands.length < raster.getBandCount()) { |
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int[] newRenderBands = new int[raster.getBandCount()]; |
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for (int i = 0; i < renderBands.length; i++) |
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newRenderBands[i] = renderBands[i]; |
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for (int i = renderBands.length; i < newRenderBands.length; i++) |
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newRenderBands[i] = i; |
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renderBands = newRenderBands; |
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} |
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if(renderBands == null) |
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renderBands = new int[]{0, 1, 2}; |
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ecualizedBands = (int[]) params.get("ecualizedBands"); |
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if(ecualizedBands == null) |
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ecualizedBands = renderBands; |
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height = raster.getHeight(); |
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width = raster.getWidth(); |
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nPixels = height * width; |
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try {
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stats.calcFullStatistics(); |
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} catch (FileNotOpenException e) {
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exec = false;
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} catch (RasterDriverException e) {
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exec = false;
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} catch (InterruptedException e) { |
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exec = false;
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} |
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if(raster.getDataType() == IBuffer.TYPE_BYTE) {
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minBandValue = stats.getMinRGB(); |
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maxBandValue = stats.getMaxRGB(); |
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} |
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if(minBandValue[0] == 0 && maxBandValue[0] == 0) { |
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minBandValue = new double[raster.getBandCount()]; |
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maxBandValue = new double[raster.getBandCount()]; |
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for (int i = 0; i < minBandValue.length; i++) { |
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minBandValue[i] = 0;
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maxBandValue[i] = 255;
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} |
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//minBandValue = stats.getMin();
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//maxBandValue = stats.getMax();
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} |
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//Histogram rgbHistogram = Histogram.convertHistogramToRGB(histogram);
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Histogram rgbHistogram; |
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try {
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rgbHistogram = Histogram.convertHistogramToRGB(raster.getHistogram()); |
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} catch (HistogramException e) {
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return;
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} catch (InterruptedException e) { |
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return;
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} |
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double[][] accumNormalize = Histogram.convertTableToNormalizeAccumulate(rgbHistogram.getTable()); |
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double[][] accumNormalizeNeg = Histogram.convertTableToNormalizeAccumulate(rgbHistogram.getNegativeTable()); |
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lahe = lahe(accumNormalize, 255);
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laheNegative = lahe(accumNormalizeNeg, 255);
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nElements = (laheNegative[0].length - 1); |
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nbands = stats.getBandCount(); |
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rasterResult = RasterBuffer.getBuffer(IBuffer.TYPE_BYTE, raster.getWidth(), raster.getHeight(), raster.getBandCount(), true);
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} |
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/**
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* M?todo lahe para la ecualizaci?n. Cada posici?n del array resultante tendr? el valor de salida para
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* un valor de entrada dado.
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* @param accumNorm Histograma acumulado
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* @param value Valor m?ximo
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* @return
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*/
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private long[][] lahe(double[][] accumNorm, int value) { |
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long[][] res = new long[accumNorm.length][accumNorm[0].length]; |
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for (int i = 0; i < res.length; i++) |
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for (int j = 0; j < res[i].length; j++) |
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res[i][j] = Math.round(accumNorm[i][j] * value);
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return res;
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} |
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/**
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* Consulta si la ecualizaci?n est? activa para una banda o no
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* @param band N?mero de banda a consultar si se ha activado la ecualizaci?n
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* @return true si est? activa para esa banda y false si no lo est?.
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*/
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protected boolean ecualizationActive(int band) { |
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for (int i = 0; i < ecualizedBands.length; i++) { |
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if(band == ecualizedBands[i])
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return true; |
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} |
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return false; |
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} |
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/**
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* Obtiene una distribuci?n de probabilidad de niveles de gris.
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* @param bands N?mero de bandas
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* @param nValues Valores a distribuir. Tipicamente 255
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* @return
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*/
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/*private double[][] getProbabilityDistribution(int bands, int nValues) {
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double[][] res = new double[bands][nValues];
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for (int i = 0; i < res.length; i++)
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for (int j = 0; j < res[i].length; j++)
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res[i][j] += (double)((double)j / 255D);
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return res;
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}*/
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/**
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* Calcula un histograma aproximado ecualizado.
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* @param accumNorm
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* @param distrib
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* @return
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*/
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/*private double[][] calcApproximation(double[][] accumNorm, double[][] distrib) {
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double[][] res = new double[accumNorm.length][accumNorm[0].length];
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resValues = new int[accumNorm.length][accumNorm[0].length];
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for (int i = 0; i < accumNorm.length; i++) {
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for (int j = 0; j < accumNorm[i].length; j++) {
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double[] v = searchProbability(distrib[i], accumNorm[i][j]);
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if(v != null) {
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res[i][j] = v[0];
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resValues[i][j] = (int)v[1];
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}
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}
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}
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return res;
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}*/
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/**
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* En un array de distribuci?n de probabilidades busca la m?s cercana
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* al valor pasado
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* @param distrib Array de probabilidades
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* @param value Valor a buscar en el array
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* @return valor m?s cercano en el array
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*/
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/*private double[] searchProbability(double[] distrib, double value) {
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double dif = Math.abs(distrib[0] - value);
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for (int i = 1; i < distrib.length; i++) {
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double newDif = Math.abs(distrib[i] - value);
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if(newDif < dif)
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dif = newDif;
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else
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return new double[]{dif, i - 1};
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}
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return null;
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}*/
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.RasterFilter#getOutRasterDataType()
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*/
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public int getOutRasterDataType() { |
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return IBuffer.TYPE_BYTE;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.RasterFilter#getResult(java.lang.String)
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*/
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public Object getResult(String name) { |
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if (name.equals("raster")) |
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if(!exec)
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return (Object) this.raster; |
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else
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return (Object) this.rasterResult; |
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return null; |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.RasterFilter#getGroup()
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*/
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public String getGroup() { |
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return "radiometricos"; |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.RasterFilter#getUIParams()
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*/
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public Params getUIParams(String nameFilter) { |
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Params params = new Params();
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return params;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.RasterFilter#post()
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*/
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public void post() { |
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// En caso de que nadie apunte a raster, se liberar? su memoria.
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raster = null;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.RasterFilter#getInRasterDataType()
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*/
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public int getInRasterDataType() { |
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return 0; |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.RasterFilter#process(int, int)
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*/
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public void process(int x, int y) { |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.RasterFilter#getNames()
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*/
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public String[] getNames() { |
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return names;
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.RasterFilter#isVisible()
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*/
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public boolean isVisible() { |
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return false; |
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} |
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} |