svn-gvsig-desktop / trunk / libraries / libRaster / src / org / gvsig / raster / grid / filter / enhancement / EqualizationShortFilter.java @ 24831
History | View | Annotate | Download (2.85 KB)
| 1 |
/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
|
|---|---|
| 2 |
*
|
| 3 |
* Copyright (C) 2006 IVER T.I. and Generalitat Valenciana.
|
| 4 |
*
|
| 5 |
* This program is free software; you can redistribute it and/or
|
| 6 |
* modify it under the terms of the GNU General Public License
|
| 7 |
* as published by the Free Software Foundation; either version 2
|
| 8 |
* of the License, or (at your option) any later version.
|
| 9 |
*
|
| 10 |
* This program is distributed in the hope that it will be useful,
|
| 11 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 12 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
| 13 |
* GNU General Public License for more details.
|
| 14 |
*
|
| 15 |
* You should have received a copy of the GNU General Public License
|
| 16 |
* along with this program; if not, write to the Free Software
|
| 17 |
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
|
| 18 |
*/
|
| 19 |
package org.gvsig.raster.grid.filter.enhancement; |
| 20 |
|
| 21 |
import org.gvsig.raster.dataset.IBuffer; |
| 22 |
/**
|
| 23 |
* Filtro de ecualizaci?n de histograma para tipo de datos short.
|
| 24 |
*
|
| 25 |
* @version 11/05/2007
|
| 26 |
* @author Nacho Brodin (nachobrodin@gmail.com)
|
| 27 |
*/
|
| 28 |
public class EqualizationShortFilter extends EqualizationFilter { |
| 29 |
|
| 30 |
/*
|
| 31 |
* (non-Javadoc)
|
| 32 |
* @see org.gvsig.raster.grid.filter.enhancement.LinearEnhancementFilter#process(int, int)
|
| 33 |
*/
|
| 34 |
public void process(int col, int line) { |
| 35 |
for (int iBand = 0; iBand < raster.getBandCount(); iBand++) { |
| 36 |
short p = raster.getElemShort(line, col, iBand);
|
| 37 |
if(!equalizationActive(iBand)) {
|
| 38 |
rasterResult.setElem(line, col, iBand, p); |
| 39 |
continue;
|
| 40 |
} |
| 41 |
|
| 42 |
if (p > maxBandValue[renderBands[iBand]])
|
| 43 |
p = (short) maxBandValue[renderBands[iBand]];
|
| 44 |
else if (p < minBandValue[renderBands[iBand]]) |
| 45 |
p = (short) minBandValue[renderBands[iBand]];
|
| 46 |
|
| 47 |
int pos = (int)(((p + dto[iBand]) * nClasses) / distance[iBand]); |
| 48 |
int ecualizationPositive = (int)(lahe[renderBands[iBand]][pos]); |
| 49 |
int ecualizationNegative = (int)(lahe[renderBands[iBand]][nElements - pos]); |
| 50 |
double value = ((nElements - ecualizationNegative) + ecualizationPositive) / 2; |
| 51 |
|
| 52 |
rasterResult.setElem(line, col, iBand, (short)value);
|
| 53 |
} |
| 54 |
} |
| 55 |
|
| 56 |
double[] distance = null; |
| 57 |
double[] dto = null; |
| 58 |
/*
|
| 59 |
* (non-Javadoc)
|
| 60 |
* @see org.gvsig.raster.grid.filter.RasterFilter#pre()
|
| 61 |
*/
|
| 62 |
public void pre() { |
| 63 |
super.pre();
|
| 64 |
distance = new double[raster.getBandCount()]; |
| 65 |
dto = new double[raster.getBandCount()]; |
| 66 |
for (int i = 0; i < raster.getBandCount(); i++) { |
| 67 |
distance[i] = maxBandValue[renderBands[i]] - minBandValue[renderBands[i]]; |
| 68 |
dto[i] = -minBandValue[renderBands[i]]; |
| 69 |
} |
| 70 |
} |
| 71 |
|
| 72 |
/*
|
| 73 |
* (non-Javadoc)
|
| 74 |
* @see org.gvsig.raster.grid.filter.enhancement.LinearEnhancementFilter#getInRasterDataType()
|
| 75 |
*/
|
| 76 |
public int getInRasterDataType() { |
| 77 |
return IBuffer.TYPE_SHORT;
|
| 78 |
} |
| 79 |
|
| 80 |
/*
|
| 81 |
* (non-Javadoc)
|
| 82 |
* @see org.gvsig.raster.grid.filter.RasterFilter#getOutRasterDataType()
|
| 83 |
*/
|
| 84 |
public int getOutRasterDataType() { |
| 85 |
return IBuffer.TYPE_SHORT;
|
| 86 |
} |
| 87 |
} |