root / trunk / libraries / libRaster / src / org / gvsig / raster / dataset / properties / DatasetHistogram.java @ 10960
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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) 2007 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.dataset.properties; |
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import org.gvsig.raster.RasterLibrary; |
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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.InvalidSetViewException; |
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import org.gvsig.raster.dataset.RasterDataset; |
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import org.gvsig.raster.dataset.RasterDriverException; |
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import org.gvsig.raster.util.DataClassList; |
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import org.gvsig.raster.util.Histogram; |
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/**
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* Clase para la gesti?n de histogramas de un raster. Es la encargada del calculo de un histograma
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* total o parcial de un raster a partir de los datos de disco. Adem?s tambi?n es la encargada de gestionar
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* salvar este histograma a .rmf. En caso de que solicite un histograma del raster completo este ir?
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* a buscarlo al fichero rmf asociado antes de calcularlo por si ya existise. Al realizar el calculo
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* del histograma de la imagen completa este ser? salvado en el fichero .rmf asociado al raster.
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*
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*/
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public class DatasetHistogram { |
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/**
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* clases en las que se divide el histograma
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*/
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private DataClassList classes = null; |
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/**
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* Histograma de la imagen completa
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*/
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private Histogram histogram = null; |
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/**
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* Dataset del cual se calcula el histograma
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*/
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private RasterDataset dataset = null; |
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/**
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* Constructor
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* @param dataset
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*/
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public DatasetHistogram(RasterDataset dataset){
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this.dataset = dataset;
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} |
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/**
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* Asigna una lista de clases sobre la que se calcular? la petici?n de
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* histograma.
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* @param classes
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*/
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public void setClasses(DataClassList classes){ |
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this.classes = classes;
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} |
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/**
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* Obtiene el histograma. Si puede conseguirlo del fichero rmf ir? all? a
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* buscarlo sino lo calcular?.
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* @return histograma
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*/
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public Histogram getHistogram() throws FileNotOpenException, RasterDriverException { |
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try {
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if(dataset != null){ |
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if(classes == null){ |
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if(dataset.getDataType() == IBuffer.TYPE_BYTE){
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histogram = new Histogram(dataset.getBandCount(), 256); |
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return getHistogramByValue();
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}else{
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DatasetStatistics stats = dataset.getStatistics(); |
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stats.calcFullStatistics(); |
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classes = DataClassList.getClasses(stats.getMinimun(), stats.getMaximun(), RasterLibrary.defaultNumberOfClasses); |
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} |
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} |
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histogram = new Histogram(dataset.getBandCount(), classes.length());
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return getHistogramByClass();
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} |
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} catch (InvalidSetViewException e) {
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//La vista se selecciona autom?ticamente no deber?a darse esta excepci?n
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} |
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return null; |
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} |
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/**
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* Obtiene un histograma para valores de tipo byte. El resto de tipos
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* de datos se separan por clases, bien introducidas por el usuario
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* bien autocalculadas.
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*
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* @return histograma
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*/
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private Histogram getHistogramByValue() throws InvalidSetViewException, FileNotOpenException, RasterDriverException { |
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if(dataset.getDataType() != IBuffer.TYPE_BYTE)
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return null; |
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for (int band = 0; band < dataset.getBandCount(); band++) { |
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for (int line = 0; line < dataset.getHeight(); line++) { |
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Object obj = dataset.readCompleteLine(line, band);
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byte[] bLine = (byte[])obj; |
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for (int k = 0; k < bLine.length; k++) |
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histogram.incrementPxValue(band, (bLine[k] & 0xff));
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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 histograma teniendo en cuenta la lista de clases
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* @return Histograma correspondiente a la lista de clases
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*/
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private Histogram getHistogramByClass() throws InvalidSetViewException, FileNotOpenException, RasterDriverException { |
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if(classes == null) |
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return null; |
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for (int band = 0; band < dataset.getBandCount(); band++) { |
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for (int line = 0; line < dataset.getHeight(); line++) { |
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Object obj = dataset.readCompleteLine(line, band);
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switch(dataset.getDataType()){
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case IBuffer.TYPE_BYTE: byte[] bLine = (byte[])obj; |
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for (int k = 0; k < bLine.length; k++) { |
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int pixelValue = classes.getClassPosition((double)bLine[k]); |
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if(pixelValue >= 0) |
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histogram.incrementPxValue(band, pixelValue); |
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} |
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break;
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case IBuffer.TYPE_SHORT: short[] sLine = (short[])obj; |
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for (int k = 0; k < sLine.length; k++) { |
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int pixelValue = classes.getClassPosition((double)sLine[k]); |
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if(pixelValue >= 0) |
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histogram.incrementPxValue(band, pixelValue); |
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} |
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break;
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case IBuffer.TYPE_INT: int[] iLine = (int[])obj; |
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for (int k = 0; k < iLine.length; k++) { |
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int pixelValue = classes.getClassPosition((double)iLine[k]); |
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if(pixelValue >= 0) |
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histogram.incrementPxValue(band, pixelValue); |
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} |
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break;
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case IBuffer.TYPE_FLOAT: float[] fLine = (float[])obj; |
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for (int k = 0; k < fLine.length; k++) { |
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int pixelValue = classes.getClassPosition((double)fLine[k]); |
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if(pixelValue >= 0) |
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histogram.incrementPxValue(band, pixelValue); |
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} |
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break;
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case IBuffer.TYPE_DOUBLE: double[] dLine = (double[])obj; |
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for (int k = 0; k < dLine.length; k++) { |
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int pixelValue = classes.getClassPosition((double)dLine[k]); |
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if(pixelValue >= 0) |
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histogram.incrementPxValue(band, pixelValue); |
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} |
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break;
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} |
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} |
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} |
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return histogram;
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} |
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} |