| gvSIG desktop 1

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

 *

 * Copyright (C) 2006 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.gvsig.raster.grid.filter.enhancement;

import org.gvsig.raster.buffer.RasterBuffer;

import org.gvsig.raster.dataset.IBuffer;

import org.gvsig.raster.dataset.properties.DatasetListStatistics;

import org.gvsig.raster.grid.filter.RasterFilter;

/**

 * Clase base para los filtros de realzado lineal. Lee el m?nimo y m?xmo de la clase

 * Statistic que ser?n calculados por PercentTailTrimFilter o ComputeMinMaxFilter dependiendo

 * de si est? activado el recorte de colas o no. En Statistic tambi?n est?n los segundos

 * valores despu?s del m?nimo y m?ximo que son los que se utilizan con la opci?n eliminar

 * extremos activada. Estos se usaran en vez del m?nimo y m?ximo cuando la variable

 * removeExtrema est? a true.

 * @author Nacho Brodin (nachobrodin@gmail.com)

 */

public abstract class LinearEnhancementFilter extends RasterFilter {

        public static String                        genericName = "enhanced";

    protected double[]                         scale = new double[3];

    protected double[]                         offset = new double[3];

    protected DatasetListStatistics        stats = null; 

    protected double[]                         minBandValue = null;

    protected double[]                         maxBandValue = null;

    protected boolean                                 removeEnds = false;

    protected double                                 tailTrim = 0D;

    protected IBuffer                                rasterResult = null;

        protected int                                         nbands = 3;

    /**

     * Constructor

     *

     */

    public LinearEnhancementFilter() {

        super();

        super.fName = genericName;

        this.fPriority = 21;

    }

    /* (non-Javadoc)

     * @see org.cresques.io.raster.IRasterFilter#pre()

     */

    public void pre() {

        raster = (IBuffer) params.get("raster");

        stats = (DatasetListStatistics) params.get("stats");

        removeEnds = ((Boolean) params.get("remove")).booleanValue();

        tailTrim = ((Double) params.get("tailTrim")).doubleValue();

        height = raster.getHeight();

        width = raster.getWidth();

        if(tailTrim != 0){ //Max y Min con recorte de colas

                double[][] tailTrimByBand = (double[][])stats.getTailTrimValue(tailTrim);

                scale = new double[tailTrimByBand.length];

            offset = new double[tailTrimByBand.length];

                minBandValue = new double[tailTrimByBand.length];

                maxBandValue = new double[tailTrimByBand.length];

                for(int i = 0; i < tailTrimByBand.length; i++){

                        minBandValue[i] = tailTrimByBand[i][0];

                        maxBandValue[i] = tailTrimByBand[i][1];

                }

        }else{

                scale = new double[stats.getMin().length];

            offset = new double[stats.getMin().length];

                    if (removeEnds) { //Si est? activado eliminar extremos gastamos el 2? m?ximo/m?nimo

                            minBandValue = stats.getSecondMin();

                    maxBandValue = stats.getSecondMax();

                } else { //Si no est? activado eliminar extremos

                        minBandValue = stats.getMin();

                    maxBandValue = stats.getMax();

                }

        }

        for (int i = 0; i < minBandValue.length; i++) {

            scale[i] = 255D / (maxBandValue[i] - minBandValue[i]);

            offset[i] = (255D * minBandValue[i]) / (minBandValue[i] -

                        maxBandValue[i]);

        }

        nbands = stats.getBandCount();

        rasterResult = RasterBuffer.getBuffer(IBuffer.TYPE_BYTE, raster.getWidth(), raster.getHeight(), raster.getBandCount(), true);

    }

    /**

     * Obtiene true si est? activado el flag de eliminar extremos y false si no lo est?

     */

    public Boolean getRemoveEnds() {

        return new Boolean(removeEnds);

    }

    /**

     * Obtiene el porcentaje de recorte de colas aplicado o 0 si no tiene.

     * @return 

     */

    public Double getTailTrim(){

            return new Double(tailTrim);

    }

    /*

     *  (non-Javadoc)

     * @see org.gvsig.fmap.grid.filter.IRasterFilter#getOutRasterDataType()

     */

    public int getOutRasterDataType() {

                return IBuffer.TYPE_BYTE;

        }

    /*

         *  (non-Javadoc)

         * @see org.gvsig.fmap.grid.filter.IRasterFilter#getResult(java.lang.String)

         */

        public Object getResult(String name) {

        return (Object) this.rasterResult;

        }

}