root / trunk / libraries / libRaster / src / org / gvsig / raster / grid / filter / enhancement / LinearStretchEnhancementByteFilter.java @ 19409
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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.dataset.IBuffer; |
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import org.gvsig.raster.grid.filter.enhancement.LinearStretchParams.Stretch; |
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/**
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* Filtro de realce lineal para tipos de datos byte. El realce es aplicado por intervalos.
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* Para cada pixel se obtiene en que intervalo se encuentra y se aplica la scala y offset
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* calculados para ese intervalo.
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*
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* @version 11/05/2007
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*/
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public class LinearStretchEnhancementByteFilter extends LinearStretchEnhancementFilter { |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.enhancement.LinearEnhancementFilter#process(int, int)
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*/
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public void process(int col, int line) { |
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for (int iBand = 0; iBand < raster.getBandCount(); iBand++) { |
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int p = (int)(raster.getElemByte(line, col, iBand) & 0xff); |
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if (renderBands[iBand] < 0) { |
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rasterResult.setElem(line, col, iBand, (byte) p);
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continue;
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} |
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processValue(p, stretchs.gray, col, line, iBand); |
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switch (iBand) {
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case 0: processValue(p, scaleOffsetList[0], col, line, iBand); |
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break;
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case 1: processValue(p, scaleOffsetList[1], col, line, iBand); |
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break;
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case 2: processValue(p, scaleOffsetList[2], col, line, iBand); |
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break;
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} |
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} |
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} |
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/**
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* Procesa un dato del raster aplicandole el factor de escala y desplazamiento que
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* necesita.
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* @param p Valor del punto
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* @param data Estructura de datos con los valores de escala y desplazamiento
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* @param col Columna del valor dentro del raster
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* @param line L?nea del valor dentro del raster
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* @param iBand N?mero de banda del valor dentro del raster
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* @return true si ha podido ser procesado y false si no lo hace
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*/
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private void processValue(int p, Stretch data, int col, int line, int iBand) { |
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if(data.scale != null) { |
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if (p > data.maxValue)
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p = (int) data.maxValue;
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else if (p < data.minValue) |
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p = (int) data.minValue;
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for (int i = 0; i < data.scale.length; i++) { |
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if(p >= data.stretchIn[i] && p <= data.stretchIn[i + 1]) |
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p = (int)(((double)p) * data.scale[i] + data.offset[i]); |
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} |
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rasterResult.setElem(line, col, iBand, (byte)p);
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} |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.enhancement.LinearEnhancementFilter#getInRasterDataType()
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*/
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public int getInRasterDataType() { |
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return IBuffer.TYPE_BYTE;
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} |
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} |