root / trunk / libraries / libRaster / src / org / gvsig / raster / grid / filter / segmentation / FirstDerivativeFilter.java @ 21803
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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) 2004 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.segmentation; |
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import org.gvsig.raster.buffer.RasterBuffer; |
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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.grid.filter.RasterFilter; |
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/**
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* Clase base para los filtros de primera derivada.
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*
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* @version 04/06/2007
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* @author Diego Guerrero Sevilla <diego.guerrero@uclm.es>
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*/
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public class FirstDerivativeFilter extends RasterFilter { |
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public static String[] names = new String[] {"sobel", "roberts", "prewitt", "freichen"}; |
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public static final int TYPE_SOBEL = 0; |
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public static final int TYPE_ROBERTS = 1; |
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public static final int TYPE_PREWITT = 2; |
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public static final int TYPE_FREICHEN = 3; |
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protected int umbral = 0; |
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protected boolean compare = false; |
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protected Kernel operatorH; |
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protected Kernel operatorV; |
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private int operator = 0; |
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// Kernels:------------------------------------------
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static final double sobelH[][]= {{-1,0,1},{-2,0,2},{-1,0,1}}; |
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static final double sobelV[][]= {{-1,-2,-1},{0,0,0},{1,2,1}}; |
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static final Kernel sobelHKernel = new Kernel(sobelH); |
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static final Kernel sobelVKernel = new Kernel(sobelV); |
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static final double robertsH[][]= {{0,0,-1},{0,1,0},{0,0,0}}; |
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static final double robertsV[][]= {{-1,0,0},{0,1,0},{0,0,0}}; |
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static final Kernel robertsHKernel = new Kernel(robertsH); |
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static final Kernel robertsVKernel = new Kernel(robertsV); |
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static final double prewittH[][]= {{1,0,-1},{1,0,-1},{1,0,-1}}; |
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static final double prewittV[][] = {{-1,-1,-1},{0,0,0},{1,1,1}}; |
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static final Kernel prewittHKernel = new Kernel(prewittH); |
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static final Kernel prewittVKernel = new Kernel(prewittV); |
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static final double freiChenH[][]= {{-1,-1.4D,-1},{0,0,0},{1,1.4D,1}}; |
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static final double freiChenV[][]= {{-1,0,1},{-1.4D,0,1.4D},{-1,0,1}}; |
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//static final double freiChenH[][]= {{-1,-1.4142D,-1},{0,0,0},{1,1.4142D,1}};
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//static final double freiChenV[][]= {{-1,0,1},{-1.4142D,0,1.4142D},{-1,0,1}};
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static final Kernel freiChenHKernel = new Kernel(freiChenH); |
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static final Kernel freiChenVKernel = new Kernel(freiChenV); |
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// --------------------------------------------------
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/**
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* Constructor
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*/
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public FirstDerivativeFilter() {
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setName(names[0]);
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} |
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public void pre() { |
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exec = true;
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raster = (RasterBuffer) params.get("raster");
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height = raster.getHeight(); |
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width = raster.getWidth(); |
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if (params.get("umbral") != null) |
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umbral = ((Integer) params.get("umbral")).intValue(); |
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else
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umbral = 0;
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if (params.get("compare") != null) |
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compare = ((Boolean) params.get("compare")).booleanValue(); |
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else
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compare = false;
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operator = 0;
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for (int i = 0; i < names.length; i++) { |
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if (names[i].equals(getName())) {
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operator = i; |
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break;
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} |
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} |
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switch (operator) {
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case TYPE_SOBEL:
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operatorH = sobelHKernel; |
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operatorV = sobelVKernel; |
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break;
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case TYPE_ROBERTS:
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operatorH = robertsHKernel; |
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operatorV = robertsVKernel; |
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break;
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case TYPE_PREWITT:
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operatorH = prewittHKernel; |
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operatorV = prewittVKernel; |
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break;
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case TYPE_FREICHEN:
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operatorH = freiChenHKernel; |
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operatorV = freiChenVKernel; |
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break;
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} |
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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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* Obtiene el umbral
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* @return entero que representa el umbral
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*/
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public int getUmbral() { |
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return umbral;
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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 "deteccion_bordes"; |
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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#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.IRasterFilter#getParams()
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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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params.setParam("Umbral",
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new Integer(umbral), |
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Params.SLIDER, |
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new String[] {"0", "255", "0", "1", "25" }); //min, max, valor defecto, intervalo peque?o, intervalo grande; |
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params.setParam("Compare",
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new Boolean(compare), |
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Params.CHECK, |
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null);
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params.setParam("FilterName",
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getName(), |
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-1,
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null);
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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#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#getOutRasterDataType()
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*/
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public int getOutRasterDataType() { |
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return RasterBuffer.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 this.raster; |
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return this.rasterResult; |
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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#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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} |