root / trunk / libraries / libRaster / src / org / gvsig / raster / grid / filter / segmentation / FirstDerivativeShortFilter.java @ 11986
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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.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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/**
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* Filtro de Sobel que se aplica en la imagen. Toma como entrada la imagen y el
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* umbral (cero para no umbralizar).
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*
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* @author Diego Guerrero Sevilla <diego.guerrero@uclm.es>
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*/
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public class FirstDerivativeShortFilter extends FirstDerivativeFilter { |
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protected IBuffer rasterResult = null; |
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/**
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* Constructor para la asignaci?n del identificador del filtro
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* @param fName Cadena que representa el identificador del filtro
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*/
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public FirstDerivativeShortFilter() {
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super();
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.raster.grid.filter.segmentation.FirstDerivativeFilter#pre()
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*/
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public void pre() { |
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super.pre();
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rasterResult = RasterBuffer.getBuffer(IBuffer.TYPE_SHORT, raster.getWidth(), raster.getHeight(), raster.getBandCount(), true);
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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 col, int line) { |
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int out;
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int convoResult[] = new int[4]; |
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int ladoVentana = 3; |
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int semiLado = (ladoVentana - 1) >> 1; |
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double ventana[][] = new double[ladoVentana][ladoVentana]; |
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Kernel kernel = null; |
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for (int band = 0; band < raster.getBandCount(); band++) { |
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if ((col - semiLado >= 0) && (line - semiLado >= 0) && (col + semiLado < width) && (line + semiLado < height)) { |
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// Obtener el vector con la ventanas de muestras
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for (int j = -semiLado; j <= semiLado; j++) |
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for (int i = -semiLado; i <= semiLado; i++) |
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ventana[i + semiLado][j + semiLado] = raster.getElemShort(line + j, col + i, band); |
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kernel = new Kernel(ventana); |
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convoResult[0] = (int) operatorH.convolution(kernel); |
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convoResult[1] = (int) operatorV.convolution(kernel); |
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if (compare) {
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if (convoResult[0] > convoResult[1]) |
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out = convoResult[0];
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else
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out = convoResult[1];
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} else {
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out = (int) Math.sqrt(Math.pow(convoResult[0], 2) + Math.pow(convoResult[1], 2)); |
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} |
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if (umbral > 0) { |
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if (out >= umbral)
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out = 255;
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else
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out = 0;
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} else {
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if (out < 0) |
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out = 0;
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else if (out > 255) |
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out = 255;
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} |
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rasterResult.setElem(line, col, band, (short) out);
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} else {
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rasterResult.setElem(line, col, band, (short) raster.getElemShort(line, col, band));
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} |
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} |
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} |
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public int getInRasterDataType() { |
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return RasterBuffer.TYPE_SHORT;
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} |
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public int getOutRasterDataType() { |
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return RasterBuffer.TYPE_SHORT;
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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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return (Object) this.rasterResult; |
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} else {
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return null; |
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} |
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} |
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} |