| gvSIG desktop 1

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

*

* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

*

* This program is free software; you can redistribute it and/or

* modify it under the terms of the GNU General Public License

* as published by the Free Software Foundation; either version 2

* of the License, or (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

*/

package org.cresques.filter.segmentation;

import java.awt.Image;

import org.cresques.filter.RasterFilter;

import org.cresques.io.data.RasterBuf;

import org.gvsig.i18n.Messages;

/**

 * Clase base para los filtros Sobel.

 *

 * @author Diego Guerrero Sevilla  <diego.guerrero@uclm.es>

 *

 */

public abstract class FirstDerivativeFilter extends RasterFilter {

        public static final int TYPE_SOBEL  = 0;

        public static final int TYPE_ROBERTS  = 1;

        public static final int TYPE_PREWITT  = 2;

        public static final int TYPE_FREICHEN  = 3;

        protected int                         umbral = 0;

        protected boolean                 compare = false;

        protected Image                  imageResult = null;

        protected RasterBuf         rasterResult = null;

        protected Kernel                 operatorH;

        protected Kernel                 operatorV;

        protected int                        operator;

        // Kernels:------------------------------------------

        double sobelH[][]= {{-1,0,1},{-2,0,2},{-1,0,1}};

        double sobelV[][]= {{-1,-2,-1},{0,0,0},{1,2,1}};

        Kernel sobelHKernel = new Kernel(sobelH);

        Kernel sobelVKernel = new Kernel(sobelV);

        double robertsH[][]= {{0,0,-1},{0,1,0},{0,0,0}};

        double robertsV[][]= {{-1,0,0},{0,1,0},{0,0,0}};

        Kernel robertsHKernel = new Kernel(robertsH);

        Kernel robertsVKernel = new Kernel(robertsV);

        double prewittH[][]= {{1,0,-1},{1,0,-1},{1,0,-1}};

        double prewittV[][]= {{-1,-1,-1},{0,0,0},{1,1,1}};

        Kernel prewittHKernel = new Kernel(prewittH);

        Kernel prewittVKernel = new Kernel(prewittV);

        double freiChenH[][]= {{1,0,-1},{1.4142D,0,-1.4142D},{1,0,-1}};

        double freiChenV[][]= {{-1,-1.4142D,-1},{0,0,0},{1,1.4142D,1}};

        Kernel freiChenHKernel = new Kernel(freiChenH);

        Kernel freiChenVKernel = new Kernel(freiChenV);

        // --------------------------------------------------

        public FirstDerivativeFilter() {

                super();

        }

        /**

         * Constructor para la asignaci?n del identificador del filtro

         * @param fName Cadena que representa el identificador del filtro 

         */

        public FirstDerivativeFilter(String fName) {

                super();

                super.filterName = fName;

        }

        public void pre() {

                if (params.get("umbral")!=null)

                        umbral = ((Integer)params.get("umbral")).intValue();

                else this.umbral = 0;

                if (params.get("compare")!=null)

                        compare = ((Boolean)params.get("compare")).booleanValue();

                else this.compare = false;

                if (params.get("operator")!=null)

                        operator = ((Integer)params.get("operator")).intValue();

                else this.operator = 0;

                switch (operator){

                case TYPE_SOBEL:

                        operatorH=sobelHKernel;

                        operatorV=sobelVKernel;

                        break;

                case TYPE_ROBERTS:

                        operatorH=robertsHKernel;

                        operatorV=robertsVKernel;

                        break;

                case TYPE_PREWITT:

                        operatorH=prewittHKernel;

                        operatorV=prewittVKernel;

                        break;

                case TYPE_FREICHEN:

                        operatorH=freiChenHKernel;

                        operatorV=freiChenVKernel;

                        break;

                }

        }

        public void post() {

                // TODO Auto-generated method stub

        }

        /**

         * Obtiene el umbral 

         * @return entero que representa el umbral

         */

        public int getUmbral() {

                return umbral;

        }

}