svn-gvsig-desktop / trunk / libraries / libRaster / src / org / gvsig / raster / buffer / BufferInterpolation.java @ 11472
History | View | Annotate | Download (29.4 KB)
| 1 |
/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
|
|---|---|
| 2 |
*
|
| 3 |
* Copyright (C) 2007 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.buffer; |
| 20 |
|
| 21 |
import org.gvsig.raster.dataset.IBuffer; |
| 22 |
|
| 23 |
/**
|
| 24 |
* Clase que contiene la funcionalidad para poder interpolar un buffer de datos
|
| 25 |
* por distintos m?todos.
|
| 26 |
*
|
| 27 |
* @version 07/05/2007
|
| 28 |
* @author Nacho Brodin (nachobrodin@gmail.com)
|
| 29 |
*
|
| 30 |
*/
|
| 31 |
public class BufferInterpolation { |
| 32 |
public final static int INTERPOLATION_Undefined = 0; |
| 33 |
public final static int INTERPOLATION_NearestNeighbour = 1; |
| 34 |
public final static int INTERPOLATION_Bilinear = 2; |
| 35 |
public final static int INTERPOLATION_InverseDistance = 3; |
| 36 |
public final static int INTERPOLATION_BicubicSpline = 4; |
| 37 |
public final static int INTERPOLATION_BSpline = 5; |
| 38 |
|
| 39 |
private RasterBuffer buffer = null; |
| 40 |
|
| 41 |
/**
|
| 42 |
* Constructor. Asigna un RasterBuffer.
|
| 43 |
* @param buf
|
| 44 |
*/
|
| 45 |
public BufferInterpolation(RasterBuffer buf) {
|
| 46 |
this.buffer = buf;
|
| 47 |
} |
| 48 |
|
| 49 |
/**
|
| 50 |
* Ajusta el raster al ancho y alto solicitado por el vecino m?s cercano. Promedia el valor de dos
|
| 51 |
* pixeles contiguos.
|
| 52 |
* @param w Nuevo ancho
|
| 53 |
* @param h Nuevo alto
|
| 54 |
*/
|
| 55 |
public RasterBuffer adjustRasterNearestNeighbourInterpolation(int w, int h) { |
| 56 |
double stepX = (double)w / (double)buffer.width; |
| 57 |
double stepY = (double)h / (double)buffer.height; |
| 58 |
RasterBuffer rasterBuf = new RasterMemoryBuffer(buffer.getDataType(), w, h, buffer.getBandCount(), true); |
| 59 |
|
| 60 |
int[] bands = new int[rasterBuf.getBandCount()]; |
| 61 |
for(int iBand = 0; iBand < rasterBuf.getBandCount(); iBand ++) |
| 62 |
bands[iBand] = iBand; |
| 63 |
|
| 64 |
|
| 65 |
switch (buffer.dataType) {
|
| 66 |
case RasterBuffer.TYPE_BYTE:
|
| 67 |
for(int iBand = 0; iBand < bands.length; iBand ++) { |
| 68 |
if(w <= buffer.width) { //submuestreo |
| 69 |
for(int iRow = 0; iRow < buffer.height; iRow ++) |
| 70 |
for(int iCol = 0; iCol < buffer.width; iCol ++) |
| 71 |
rasterBuf.setElem((int)(iRow * stepY), (int)(iCol * stepX), bands[iBand], buffer.getElemByte(iRow, iCol, iBand)); |
| 72 |
}else{ //supermuestreo |
| 73 |
for(int iRow = 0; iRow < h; iRow ++) |
| 74 |
for(int iCol = 0; iCol < w; iCol ++) |
| 75 |
rasterBuf.setElem(iRow, iCol, bands[iBand], buffer.getElemByte((int)(iRow / stepY), (int)(iCol / stepX), iBand)); |
| 76 |
} |
| 77 |
} |
| 78 |
break;
|
| 79 |
case RasterBuffer.TYPE_DOUBLE:
|
| 80 |
for(int iBand = 0; iBand < bands.length; iBand ++) { |
| 81 |
if(w <= buffer.width) { //submuestreo |
| 82 |
for(int iRow = 0; iRow < buffer.height; iRow ++) |
| 83 |
for(int iCol = 0; iCol < buffer.width; iCol ++) |
| 84 |
rasterBuf.setElem((int)(iRow * stepY), (int)(iCol * stepX), bands[iBand], buffer.getElemDouble(iRow, iCol, iBand)); |
| 85 |
}else{ //supermuestreo |
| 86 |
for(int iRow = 0; iRow < h; iRow ++) |
| 87 |
for(int iCol = 0; iCol < w; iCol ++) |
| 88 |
rasterBuf.setElem(iRow, iCol, bands[iBand], buffer.getElemDouble((int)(iRow / stepY), (int)(iCol / stepX), iBand)); |
| 89 |
} |
| 90 |
} |
| 91 |
break;
|
| 92 |
case RasterBuffer.TYPE_FLOAT:
|
| 93 |
for(int iBand = 0; iBand < bands.length; iBand ++) { |
| 94 |
if(w <= buffer.width) { //submuestreo |
| 95 |
for(int iRow = 0; iRow < buffer.height; iRow ++) |
| 96 |
for(int iCol = 0; iCol < buffer.width; iCol ++) |
| 97 |
rasterBuf.setElem((int)(iRow * stepY), (int)(iCol * stepX), bands[iBand], buffer.getElemFloat(iRow, iCol, iBand)); |
| 98 |
}else{ //supermuestreo |
| 99 |
for(int iRow = 0; iRow < h; iRow ++) |
| 100 |
for(int iCol = 0; iCol < w; iCol ++) |
| 101 |
rasterBuf.setElem(iRow, iCol, bands[iBand], buffer.getElemFloat((int)(iRow / stepY), (int)(iCol / stepX), iBand)); |
| 102 |
} |
| 103 |
} |
| 104 |
break;
|
| 105 |
case RasterBuffer.TYPE_INT:
|
| 106 |
for(int iBand = 0; iBand < bands.length; iBand ++) { |
| 107 |
if(w <= buffer.width) { //submuestreo |
| 108 |
for(int iRow = 0; iRow < buffer.height; iRow ++) |
| 109 |
for(int iCol = 0; iCol < buffer.width; iCol ++) |
| 110 |
rasterBuf.setElem((int)(iRow * stepY), (int)(iCol * stepX), bands[iBand], buffer.getElemInt(iRow, iCol, iBand)); |
| 111 |
}else{ //supermuestreo |
| 112 |
for(int iRow = 0; iRow < h; iRow ++) |
| 113 |
for(int iCol = 0; iCol < w; iCol ++) |
| 114 |
rasterBuf.setElem(iRow, iCol, bands[iBand], buffer.getElemInt((int)(iRow / stepY), (int)(iCol / stepX), iBand)); |
| 115 |
} |
| 116 |
} |
| 117 |
break;
|
| 118 |
case RasterBuffer.TYPE_USHORT:
|
| 119 |
case RasterBuffer.TYPE_SHORT:
|
| 120 |
for(int iBand = 0; iBand < bands.length; iBand ++) { |
| 121 |
if(w <= buffer.width) { //submuestreo |
| 122 |
for(int iRow = 0; iRow < buffer.height; iRow ++) |
| 123 |
for(int iCol = 0; iCol < buffer.width; iCol ++) |
| 124 |
rasterBuf.setElem((int)(iRow * stepY), (int)(iCol * stepX), bands[iBand], buffer.getElemShort(iRow, iCol, iBand)); |
| 125 |
}else{ //supermuestreo |
| 126 |
for(int iRow = 0; iRow < h; iRow ++) |
| 127 |
for(int iCol = 0; iCol < w; iCol ++) |
| 128 |
rasterBuf.setElem(iRow, iCol, bands[iBand], buffer.getElemShort((int)(iRow / stepY), (int)(iCol / stepX), iBand)); |
| 129 |
} |
| 130 |
} |
| 131 |
break;
|
| 132 |
} |
| 133 |
return rasterBuf;
|
| 134 |
} |
| 135 |
|
| 136 |
/**
|
| 137 |
* Ajusta el raster al ancho y alto solicitado ajustando con una interpolaci?n bilineal. Promedia
|
| 138 |
* el valor de cuatro pixeles adyacentes.
|
| 139 |
* <P>
|
| 140 |
* Para cada pixel del raster A:(x, y) obtiene el B:(x + 1, y), C:(x, y + 1), D:(x + 1, y + 1)
|
| 141 |
* Para cada valor del kernel se calcula un valor 'd' que es un peso dependiendo de su posici?n.
|
| 142 |
* Este peso depende de la posici?n del pixel destino dentro del origen. La posici?n del pixel destino
|
| 143 |
* en el origen es un valor decimal que puede ir de 0 a 1. Si est? muy pegado a la esquina superior
|
| 144 |
* izquierda estar? cercano a 0 y si est? muy pegado a la esquina inferior derecha estar? cercano a 1.
|
| 145 |
* Este valor est? representado por 'dx' y 'dy'.
|
| 146 |
* </P>
|
| 147 |
* <P>
|
| 148 |
* Los pesos aplicados son a
|
| 149 |
* <UL>
|
| 150 |
* <LI>A (1-dx) * (1-dy)</LI>
|
| 151 |
* <LI>B dx * (1-dy)</LI>
|
| 152 |
* <LI>C (1-dx) * dy</LI>
|
| 153 |
* <LI>D dx * dy</LI>
|
| 154 |
* </UL>
|
| 155 |
* La variable 'z' contiene el valor acumulado de cada peso por el valor del pixel.
|
| 156 |
* La variable 'n' contiene el valor acumulado de los pesos de los cuatro pixeles.
|
| 157 |
* El valor final del pixel ser? 'z/n', es decir un promedio del valor de los cuatro teniendo
|
| 158 |
* en cuenta el peso de cada uno.
|
| 159 |
* </P>
|
| 160 |
* @param w Nuevo ancho del buffer de salida
|
| 161 |
* @param h Nuevo alto del buffer de salida
|
| 162 |
*/
|
| 163 |
public RasterBuffer adjustRasterBilinearInterpolation(int w, int h) { |
| 164 |
double pxSize = (double)buffer.width / (double)w; |
| 165 |
RasterBuffer rasterBuf = new RasterMemoryBuffer(buffer.getDataType(), w, h, buffer.getBandCount(), true); |
| 166 |
|
| 167 |
double posX = pxSize / 2D; |
| 168 |
double posY = posX;
|
| 169 |
double dx = 0D, dy = 0D; |
| 170 |
|
| 171 |
for(int iBand = 0; iBand < buffer.getBandCount(); iBand ++) { |
| 172 |
posY = pxSize / 2D;
|
| 173 |
switch (buffer.dataType) {
|
| 174 |
case RasterBuffer.TYPE_BYTE:
|
| 175 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 176 |
dy = posY - ((int)posY);
|
| 177 |
posX = pxSize / 2D;
|
| 178 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 179 |
dx = posX - ((int)posX);
|
| 180 |
double[] kernel = getKernelByte(((int)posX), ((int)posY), iBand); |
| 181 |
rasterBuf.setElem(iRow, iCol, iBand, (byte)((byte)getBilinearValue(dx, dy, kernel) & 0xff)); |
| 182 |
posX += pxSize; |
| 183 |
} |
| 184 |
posY += pxSize; |
| 185 |
} |
| 186 |
break;
|
| 187 |
case RasterBuffer.TYPE_SHORT:
|
| 188 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 189 |
dy = posY - ((int)posY);
|
| 190 |
posX = pxSize / 2D;
|
| 191 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 192 |
dx = posX - ((int)posX);
|
| 193 |
double[] kernel = getKernelShort(((int)posX), ((int)posY), iBand); |
| 194 |
rasterBuf.setElem(iRow, iCol, iBand, (short)((short)getBilinearValue(dx, dy, kernel) & 0xffff)); |
| 195 |
posX += pxSize; |
| 196 |
} |
| 197 |
posY += pxSize; |
| 198 |
} |
| 199 |
break;
|
| 200 |
case RasterBuffer.TYPE_INT:
|
| 201 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 202 |
dy = posY - ((int)posY);
|
| 203 |
posX = pxSize / 2D;
|
| 204 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 205 |
dx = posX - ((int)posX);
|
| 206 |
double[] kernel = getKernelInt(((int)posX), ((int)posY), iBand); |
| 207 |
rasterBuf.setElem(iRow, iCol, iBand, (int)((int)getBilinearValue(dx, dy, kernel) & 0xff)); |
| 208 |
posX += pxSize; |
| 209 |
} |
| 210 |
posY += pxSize; |
| 211 |
} |
| 212 |
break;
|
| 213 |
case RasterBuffer.TYPE_FLOAT:
|
| 214 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 215 |
dy = posY - ((int)posY);
|
| 216 |
posX = pxSize / 2D;
|
| 217 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 218 |
dx = posX - ((int)posX);
|
| 219 |
double[] kernel = getKernelInt(((int)posX), ((int)posY), iBand); |
| 220 |
rasterBuf.setElem(iRow, iCol, iBand, (float)getBilinearValue(dx, dy, kernel));
|
| 221 |
posX += pxSize; |
| 222 |
} |
| 223 |
posY += pxSize; |
| 224 |
} |
| 225 |
break;
|
| 226 |
case RasterBuffer.TYPE_DOUBLE:
|
| 227 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 228 |
dy = posY - ((int)posY);
|
| 229 |
posX = pxSize / 2D;
|
| 230 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 231 |
dx = posX - ((int)posX);
|
| 232 |
double[] kernel = getKernelInt(((int)posX), ((int)posY), iBand); |
| 233 |
rasterBuf.setElem(iRow, iCol, iBand, (double)getBilinearValue(dx, dy, kernel));
|
| 234 |
posX += pxSize; |
| 235 |
} |
| 236 |
posY += pxSize; |
| 237 |
} |
| 238 |
break;
|
| 239 |
} |
| 240 |
|
| 241 |
} |
| 242 |
|
| 243 |
return rasterBuf;
|
| 244 |
} |
| 245 |
|
| 246 |
/**
|
| 247 |
* Ajusta el raster al ancho y alto solicitado ajustando con una interpolaci?n de distancia inversa.
|
| 248 |
* Asigna el valor de un pixel en funci?n inversa de la distancia.
|
| 249 |
* <P>
|
| 250 |
* Para cada pixel del raster A:(x, y) obtiene el B:(x + 1, y), C:(x, y + 1), D:(x + 1, y + 1)
|
| 251 |
* Para cada valor del kernel se calcula un valor 'd' que es un peso dependiendo de su posici?n.
|
| 252 |
* Este peso ser? dependiente de la posici?n del pixel destino dentro del origen. La posici?n del pixel destino
|
| 253 |
* en el origen es un valor decimal que puede ir de 0 a 1. Si est? muy pegado a la esquina superior
|
| 254 |
* izquierda estar? cercano a 0 y si est? muy pegado a la esquina inferior derecha estar? cercano a 1.
|
| 255 |
* Este valor est? representado por 'dx' y 'dy'. En este caso, y a diferencia del m?todo
|
| 256 |
* bilinear el peso vendr? representado por la inversa de la distancia entre la posici?n
|
| 257 |
* dentro del pixel y el origen del mismo.
|
| 258 |
* </P>
|
| 259 |
* <P>
|
| 260 |
* Los pesos aplicados son a
|
| 261 |
* <UL>
|
| 262 |
* <LI>A 1 / sqrt((1-dx) * (1-dy))</LI>
|
| 263 |
* <LI>B 1 / sqrt(dx * (1-dy))</LI>
|
| 264 |
* <LI>C 1 / sqrt((1-dx) * dy)</LI>
|
| 265 |
* <LI>D 1 / sqrt(dx * dy)</LI>
|
| 266 |
* </UL>
|
| 267 |
* La variable 'z' contiene el valor acumulado de cada peso por el valor del pixel.
|
| 268 |
* La variable 'n' contiene el valor acumulado de los pesos de los cuatro pixeles.
|
| 269 |
* El valor final del pixel ser? 'z/n', es decir un promedio del valor de los cuatro teniendo
|
| 270 |
* en cuenta el peso de cada uno.
|
| 271 |
* </P>
|
| 272 |
* @param w Nuevo ancho del buffer de salida
|
| 273 |
* @param h Nuevo alto del buffer de salida
|
| 274 |
*/
|
| 275 |
public RasterBuffer adjustRasterInverseDistanceInterpolation(int w, int h) { |
| 276 |
double pxSize = (double)buffer.width / (double)w; |
| 277 |
RasterBuffer rasterBuf = new RasterMemoryBuffer(buffer.getDataType(), w, h, buffer.getBandCount(), true); |
| 278 |
|
| 279 |
double posX = pxSize / 2D; |
| 280 |
double posY = posX;
|
| 281 |
double dx = 0D, dy = 0D; |
| 282 |
|
| 283 |
for(int iBand = 0; iBand < buffer.getBandCount(); iBand ++) { |
| 284 |
posY = pxSize / 2D;
|
| 285 |
switch (buffer.dataType) {
|
| 286 |
case RasterBuffer.TYPE_BYTE:
|
| 287 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 288 |
dy = posY - ((int)posY);
|
| 289 |
posX = pxSize / 2D;
|
| 290 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 291 |
dx = posX - ((int)posX);
|
| 292 |
double[] kernel = getKernelByte(((int)posX), ((int)posY), iBand); |
| 293 |
rasterBuf.setElem(iRow, iCol, iBand, (byte)((byte)getInverseDistanceValue(dx, dy, kernel) & 0xff)); |
| 294 |
posX += pxSize; |
| 295 |
} |
| 296 |
posY += pxSize; |
| 297 |
} |
| 298 |
break;
|
| 299 |
case RasterBuffer.TYPE_SHORT:
|
| 300 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 301 |
dy = posY - ((int)posY);
|
| 302 |
posX = pxSize / 2D;
|
| 303 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 304 |
dx = posX - ((int)posX);
|
| 305 |
double[] kernel = getKernelShort(((int)posX), ((int)posY), iBand); |
| 306 |
rasterBuf.setElem(iRow, iCol, iBand, (short)((short)getInverseDistanceValue(dx, dy, kernel) & 0xffff)); |
| 307 |
posX += pxSize; |
| 308 |
} |
| 309 |
posY += pxSize; |
| 310 |
} |
| 311 |
break;
|
| 312 |
case RasterBuffer.TYPE_INT:
|
| 313 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 314 |
dy = posY - ((int)posY);
|
| 315 |
posX = pxSize / 2D;
|
| 316 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 317 |
dx = posX - ((int)posX);
|
| 318 |
double[] kernel = getKernelInt(((int)posX), ((int)posY), iBand); |
| 319 |
rasterBuf.setElem(iRow, iCol, iBand, (int)((int)getInverseDistanceValue(dx, dy, kernel) & 0xff)); |
| 320 |
posX += pxSize; |
| 321 |
} |
| 322 |
posY += pxSize; |
| 323 |
} |
| 324 |
break;
|
| 325 |
case RasterBuffer.TYPE_FLOAT:
|
| 326 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 327 |
dy = posY - ((int)posY);
|
| 328 |
posX = pxSize / 2D;
|
| 329 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 330 |
dx = posX - ((int)posX);
|
| 331 |
double[] kernel = getKernelFloat(((int)posX), ((int)posY), iBand); |
| 332 |
rasterBuf.setElem(iRow, iCol, iBand, (float)getInverseDistanceValue(dx, dy, kernel));
|
| 333 |
posX += pxSize; |
| 334 |
} |
| 335 |
posY += pxSize; |
| 336 |
} |
| 337 |
break;
|
| 338 |
case RasterBuffer.TYPE_DOUBLE:
|
| 339 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 340 |
dy = posY - ((int)posY);
|
| 341 |
posX = pxSize / 2D;
|
| 342 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 343 |
dx = posX - ((int)posX);
|
| 344 |
double[] kernel = getKernelDouble(((int)posX), ((int)posY), iBand); |
| 345 |
rasterBuf.setElem(iRow, iCol, iBand, (double)getInverseDistanceValue(dx, dy, kernel));
|
| 346 |
posX += pxSize; |
| 347 |
} |
| 348 |
posY += pxSize; |
| 349 |
} |
| 350 |
break;
|
| 351 |
} |
| 352 |
|
| 353 |
} |
| 354 |
|
| 355 |
return rasterBuf;
|
| 356 |
} |
| 357 |
|
| 358 |
/**
|
| 359 |
* Ajusta el raster al ancho y alto solicitado ajustando con una interpolaci?n BSpline. Promedia
|
| 360 |
* el valor de cuatro pixeles adyacentes.
|
| 361 |
* @param w Nuevo ancho
|
| 362 |
* @param h Nuevo alto
|
| 363 |
*/
|
| 364 |
public RasterBuffer adjustRasterBSplineInterpolation(int w, int h) { |
| 365 |
double pxSize = (double)buffer.width / (double)w; |
| 366 |
RasterBuffer rasterBuf = new RasterMemoryBuffer(buffer.getDataType(), w, h, buffer.getBandCount(), true); |
| 367 |
|
| 368 |
double posX = pxSize / 2D; |
| 369 |
double posY = posX;
|
| 370 |
double dx = 0D, dy = 0D; |
| 371 |
|
| 372 |
for(int iBand = 0; iBand < buffer.getBandCount(); iBand ++) { |
| 373 |
posY = pxSize / 2D;
|
| 374 |
switch (buffer.dataType) {
|
| 375 |
case RasterBuffer.TYPE_BYTE:
|
| 376 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 377 |
dy = posY - ((int)posY);
|
| 378 |
posX = pxSize / 2D;
|
| 379 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 380 |
dx = posX - ((int)posX);
|
| 381 |
double[][] kernel = get4x4Submatrix(((int)posX), ((int)posY), iBand); |
| 382 |
if(kernel == null) { |
| 383 |
double[] k = getKernelByte(((int)posX), ((int)posY), iBand); |
| 384 |
rasterBuf.setElem(iRow, iCol, iBand, (byte)((byte)getBilinearValue(dx, dy, k) & 0xff)); |
| 385 |
} else
|
| 386 |
rasterBuf.setElem(iRow, iCol, iBand, (byte)((byte)getBSplineValue(dx, dy, kernel) & 0xff)); |
| 387 |
posX += pxSize; |
| 388 |
} |
| 389 |
posY += pxSize; |
| 390 |
} |
| 391 |
break;
|
| 392 |
case RasterBuffer.TYPE_SHORT:
|
| 393 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 394 |
dy = posY - ((int)posY);
|
| 395 |
posX = pxSize / 2D;
|
| 396 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 397 |
dx = posX - ((int)posX);
|
| 398 |
double[][] kernel = get4x4Submatrix(((int)posX), ((int)posY), iBand); |
| 399 |
if(kernel == null) { |
| 400 |
double[] k = getKernelShort(((int)posX), ((int)posY), iBand); |
| 401 |
rasterBuf.setElem(iRow, iCol, iBand, (short)((short)getBilinearValue(dx, dy, k) & 0xffff)); |
| 402 |
} else
|
| 403 |
rasterBuf.setElem(iRow, iCol, iBand, (short)((short)getBSplineValue(dx, dy, kernel) & 0xffff)); |
| 404 |
posX += pxSize; |
| 405 |
} |
| 406 |
posY += pxSize; |
| 407 |
} |
| 408 |
break;
|
| 409 |
case RasterBuffer.TYPE_INT:
|
| 410 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 411 |
dy = posY - ((int)posY);
|
| 412 |
posX = pxSize / 2D;
|
| 413 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 414 |
dx = posX - ((int)posX);
|
| 415 |
double[][] kernel = get4x4Submatrix(((int)posX), ((int)posY), iBand); |
| 416 |
if(kernel == null) { |
| 417 |
double[] k = getKernelInt(((int)posX), ((int)posY), iBand); |
| 418 |
rasterBuf.setElem(iRow, iCol, iBand, (int)((int)getBilinearValue(dx, dy, k) & 0xffffffff)); |
| 419 |
} else
|
| 420 |
rasterBuf.setElem(iRow, iCol, iBand, (int)((int)getBSplineValue(dx, dy, kernel) & 0xffffffff)); |
| 421 |
posX += pxSize; |
| 422 |
} |
| 423 |
posY += pxSize; |
| 424 |
} |
| 425 |
break;
|
| 426 |
case RasterBuffer.TYPE_FLOAT:
|
| 427 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 428 |
dy = posY - ((int)posY);
|
| 429 |
posX = pxSize / 2D;
|
| 430 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 431 |
dx = posX - ((int)posX);
|
| 432 |
double[][] kernel = get4x4Submatrix(((int)posX), ((int)posY), iBand); |
| 433 |
if(kernel == null) { |
| 434 |
double[] k = getKernelFloat(((int)posX), ((int)posY), iBand); |
| 435 |
rasterBuf.setElem(iRow, iCol, iBand, (float)getBilinearValue(dx, dy, k));
|
| 436 |
} else
|
| 437 |
rasterBuf.setElem(iRow, iCol, iBand, (float)getBSplineValue(dx, dy, kernel));
|
| 438 |
posX += pxSize; |
| 439 |
} |
| 440 |
posY += pxSize; |
| 441 |
} |
| 442 |
break;
|
| 443 |
case RasterBuffer.TYPE_DOUBLE:
|
| 444 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 445 |
dy = posY - ((int)posY);
|
| 446 |
posX = pxSize / 2D;
|
| 447 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 448 |
dx = posX - ((int)posX);
|
| 449 |
double[][] kernel = get4x4Submatrix(((int)posX), ((int)posY), iBand); |
| 450 |
if(kernel == null) { |
| 451 |
double[] k = getKernelDouble(((int)posX), ((int)posY), iBand); |
| 452 |
rasterBuf.setElem(iRow, iCol, iBand, (double)getBilinearValue(dx, dy, k));
|
| 453 |
} else
|
| 454 |
rasterBuf.setElem(iRow, iCol, iBand, (double)getBSplineValue(dx, dy, kernel));
|
| 455 |
posX += pxSize; |
| 456 |
} |
| 457 |
posY += pxSize; |
| 458 |
} |
| 459 |
break;
|
| 460 |
} |
| 461 |
|
| 462 |
} |
| 463 |
|
| 464 |
return rasterBuf;
|
| 465 |
} |
| 466 |
|
| 467 |
/**
|
| 468 |
* Ajusta el raster al ancho y alto solicitado ajustando con una interpolaci?n de spline bicubica.
|
| 469 |
* @param w Nuevo ancho
|
| 470 |
* @param h Nuevo alto
|
| 471 |
*/
|
| 472 |
public RasterBuffer adjustRasterBicubicSplineInterpolation(int w, int h) { |
| 473 |
double pxSize = (double)buffer.width / (double)w; |
| 474 |
RasterBuffer rasterBuf = new RasterMemoryBuffer(buffer.getDataType(), w, h, buffer.getBandCount(), true); |
| 475 |
|
| 476 |
double posX = pxSize / 2D; |
| 477 |
double posY = posX;
|
| 478 |
double dx = 0D, dy = 0D; |
| 479 |
|
| 480 |
for(int iBand = 0; iBand < buffer.getBandCount(); iBand ++) { |
| 481 |
posY = pxSize / 2D;
|
| 482 |
switch (buffer.dataType) {
|
| 483 |
case RasterBuffer.TYPE_BYTE:
|
| 484 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 485 |
dy = posY - ((int)posY);
|
| 486 |
posX = pxSize / 2D;
|
| 487 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 488 |
dx = posX - ((int)posX);
|
| 489 |
double[][] kernel = get4x4Submatrix(((int)posX), ((int)posY), iBand); |
| 490 |
if(kernel == null) { |
| 491 |
double[] k = getKernelByte(((int)posX), ((int)posY), iBand); |
| 492 |
rasterBuf.setElem(iRow, iCol, iBand, (byte)((byte)getBilinearValue(dx, dy, k) & 0xff)); |
| 493 |
} else
|
| 494 |
rasterBuf.setElem(iRow, iCol, iBand, (byte)((byte)getBicubicSplineValue(dx, dy, kernel) & 0xff)); |
| 495 |
posX += pxSize; |
| 496 |
} |
| 497 |
posY += pxSize; |
| 498 |
} |
| 499 |
break;
|
| 500 |
case RasterBuffer.TYPE_SHORT:
|
| 501 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 502 |
dy = posY - ((int)posY);
|
| 503 |
posX = pxSize / 2D;
|
| 504 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 505 |
dx = posX - ((int)posX);
|
| 506 |
double[][] kernel = get4x4Submatrix(((int)posX), ((int)posY), iBand); |
| 507 |
if(kernel == null) { |
| 508 |
double[] k = getKernelShort(((int)posX), ((int)posY), iBand); |
| 509 |
rasterBuf.setElem(iRow, iCol, iBand, (short)((short)getBilinearValue(dx, dy, k) & 0xffff)); |
| 510 |
} else
|
| 511 |
rasterBuf.setElem(iRow, iCol, iBand, (short)((short)getBicubicSplineValue(dx, dy, kernel) & 0xffff)); |
| 512 |
posX += pxSize; |
| 513 |
} |
| 514 |
posY += pxSize; |
| 515 |
} |
| 516 |
break;
|
| 517 |
case RasterBuffer.TYPE_INT:
|
| 518 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 519 |
dy = posY - ((int)posY);
|
| 520 |
posX = pxSize / 2D;
|
| 521 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 522 |
dx = posX - ((int)posX);
|
| 523 |
double[][] kernel = get4x4Submatrix(((int)posX), ((int)posY), iBand); |
| 524 |
if(kernel == null) { |
| 525 |
double[] k = getKernelInt(((int)posX), ((int)posY), iBand); |
| 526 |
rasterBuf.setElem(iRow, iCol, iBand, (int)((int)getBilinearValue(dx, dy, k) & 0xffffffff)); |
| 527 |
} else
|
| 528 |
rasterBuf.setElem(iRow, iCol, iBand, (int)((int)getBicubicSplineValue(dx, dy, kernel) & 0xffffffff)); |
| 529 |
posX += pxSize; |
| 530 |
} |
| 531 |
posY += pxSize; |
| 532 |
} |
| 533 |
break;
|
| 534 |
case RasterBuffer.TYPE_FLOAT:
|
| 535 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 536 |
dy = posY - ((int)posY);
|
| 537 |
posX = pxSize / 2D;
|
| 538 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 539 |
dx = posX - ((int)posX);
|
| 540 |
double[][] kernel = get4x4Submatrix(((int)posX), ((int)posY), iBand); |
| 541 |
if(kernel == null) { |
| 542 |
double[] k = getKernelFloat(((int)posX), ((int)posY), iBand); |
| 543 |
rasterBuf.setElem(iRow, iCol, iBand, (float)getBilinearValue(dx, dy, k));
|
| 544 |
} else
|
| 545 |
rasterBuf.setElem(iRow, iCol, iBand, (float)getBicubicSplineValue(dx, dy, kernel));
|
| 546 |
posX += pxSize; |
| 547 |
} |
| 548 |
posY += pxSize; |
| 549 |
} |
| 550 |
break;
|
| 551 |
case RasterBuffer.TYPE_DOUBLE:
|
| 552 |
for(int iRow = 0; iRow < h; iRow ++) { |
| 553 |
dy = posY - ((int)posY);
|
| 554 |
posX = pxSize / 2D;
|
| 555 |
for(int iCol = 0; iCol < w; iCol ++) { |
| 556 |
dx = posX - ((int)posX);
|
| 557 |
double[][] kernel = get4x4Submatrix(((int)posX), ((int)posY), iBand); |
| 558 |
if(kernel == null) { |
| 559 |
double[] k = getKernelDouble(((int)posX), ((int)posY), iBand); |
| 560 |
rasterBuf.setElem(iRow, iCol, iBand, (double)getBilinearValue(dx, dy, k));
|
| 561 |
} else
|
| 562 |
rasterBuf.setElem(iRow, iCol, iBand, (double)getBicubicSplineValue(dx, dy, kernel));
|
| 563 |
posX += pxSize; |
| 564 |
} |
| 565 |
posY += pxSize; |
| 566 |
} |
| 567 |
break;
|
| 568 |
} |
| 569 |
|
| 570 |
} |
| 571 |
|
| 572 |
return rasterBuf;
|
| 573 |
} |
| 574 |
|
| 575 |
/**
|
| 576 |
*
|
| 577 |
* @param dx
|
| 578 |
* @param dy
|
| 579 |
* @param kernel
|
| 580 |
* @return
|
| 581 |
*/
|
| 582 |
private double getBicubicSplineValue(double dx, double dy, double[][] kernel) { |
| 583 |
int i;
|
| 584 |
double a0, a2, a3, b1, b2, b3;
|
| 585 |
double[] c = new double[4]; |
| 586 |
|
| 587 |
for(i = 0; i < 4; i++) { |
| 588 |
a0 = kernel[0][i] - kernel[1][i]; |
| 589 |
a2 = kernel[2][i] - kernel[1][i]; |
| 590 |
a3 = kernel[3][i] - kernel[1][i]; |
| 591 |
|
| 592 |
b1 = -a0 / 3.0 + a2 - a3 / 6.0; |
| 593 |
b2 = a0 / 2.0 + a2 / 2.0; |
| 594 |
b3 = -a0 / 6.0 - a2 / 2.0 + a3 / 6.0; |
| 595 |
|
| 596 |
c[i] = kernel[1][i] + b1 * dx + b2 * (dx * dx) + b3 * (dx * dx * dx);
|
| 597 |
} |
| 598 |
|
| 599 |
a0 = c[0] - c[1]; |
| 600 |
a2 = c[2] - c[1]; |
| 601 |
a3 = c[3] - c[1]; |
| 602 |
|
| 603 |
b1 = -a0 / 3.0 + a2 - a3 / 6.0; |
| 604 |
b2 = a0 / 2.0 + a2 / 2.0; |
| 605 |
b3 = -a0 / 6.0 - a2 / 2.0 + a3 / 6.0; |
| 606 |
|
| 607 |
return( c[1] + b1 * dy + b2 * (dy * dy) + b3 * (dy * dy * dy) ); |
| 608 |
} |
| 609 |
|
| 610 |
/**
|
| 611 |
*
|
| 612 |
* @param dx
|
| 613 |
* @param dy
|
| 614 |
* @param kernel
|
| 615 |
* @return
|
| 616 |
*/
|
| 617 |
private double getBSplineValue(double dx, double dy, double[][] kernel) { |
| 618 |
int i = 0, ix = 0, iy = 0; |
| 619 |
double px = 0, py = 0, z = 0; |
| 620 |
double[] Rx = new double[4]; |
| 621 |
double[] Ry = new double[4]; |
| 622 |
|
| 623 |
for(i = 0, px = -1.0 - dx, py = -1.0 - dy; i < 4; i++, px++, py++){ |
| 624 |
Rx[i] = 0.0;
|
| 625 |
Ry[i] = 0.0;
|
| 626 |
|
| 627 |
if( (z = px + 2.0) > 0.0 ) |
| 628 |
Rx[i] += z * z * z; |
| 629 |
if( (z = px + 1.0) > 0.0 ) |
| 630 |
Rx[i] += -4.0 * z * z * z;
|
| 631 |
if( (z = px + 0.0) > 0.0 ) |
| 632 |
Rx[i] += 6.0 * z * z * z;
|
| 633 |
if( (z = px - 1.0) > 0.0 ) |
| 634 |
Rx[i] += -4.0 * z * z * z;
|
| 635 |
if( (z = py + 2.0) > 0.0 ) |
| 636 |
Ry[i] += z * z * z; |
| 637 |
if( (z = py + 1.0) > 0.0 ) |
| 638 |
Ry[i] += -4.0 * z * z * z;
|
| 639 |
if( (z = py + 0.0) > 0.0 ) |
| 640 |
Ry[i] += 6.0 * z * z * z;
|
| 641 |
if( (z = py - 1.0) > 0.0 ) |
| 642 |
Ry[i] += -4.0 * z * z * z;
|
| 643 |
|
| 644 |
Rx[i] /= 6.0;
|
| 645 |
Ry[i] /= 6.0;
|
| 646 |
} |
| 647 |
|
| 648 |
for(iy = 0, z = 0.0; iy < 4; iy++) { |
| 649 |
for(ix = 0; ix < 4; ix++) { |
| 650 |
z += kernel[ix][iy] * Rx[ix] * Ry[iy]; |
| 651 |
} |
| 652 |
} |
| 653 |
return z;
|
| 654 |
} |
| 655 |
|
| 656 |
/**
|
| 657 |
* Calcula los valores N y Z para el m?todo bilinear y obtiene el valor del pixel como
|
| 658 |
* Z / N
|
| 659 |
* @param dx distancia en X desde el centro del pixel hasta el punto. Es un valor entre 0 y 1
|
| 660 |
* @param dy distancia en Y desde el centro del pixel hasta el punto. Es un valor entre 0 y 1
|
| 661 |
* @param kernel valor del pixel y alrededor
|
| 662 |
* @return valor del pixel
|
| 663 |
*/
|
| 664 |
private double getBilinearValue(double dx, double dy, double[] kernel) { |
| 665 |
double z = 0.0, n = 0.0, d; |
| 666 |
d = (1.0 - dx) * (1.0 - dy); |
| 667 |
z += d * kernel[0];
|
| 668 |
n += d; |
| 669 |
|
| 670 |
d = dx * (1.0 - dy);
|
| 671 |
z += d * kernel[1];
|
| 672 |
n += d; |
| 673 |
|
| 674 |
d = (1.0 - dx) * dy;
|
| 675 |
z += d * kernel[2];
|
| 676 |
n += d; |
| 677 |
|
| 678 |
d = dx * dy; |
| 679 |
z += d * kernel[3];
|
| 680 |
n += d; |
| 681 |
|
| 682 |
double b = 0; |
| 683 |
if(n > 0.0) |
| 684 |
b = (z / n); |
| 685 |
return b;
|
| 686 |
} |
| 687 |
|
| 688 |
/**
|
| 689 |
* Calcula los valores N y Z para el m?todo de distancia inversa y calcula el valor del
|
| 690 |
* pixel como Z / N.
|
| 691 |
* @param dx distancia en X desde el centro del pixel hasta el punto. Es un valor entre 0 y 1
|
| 692 |
* @param dy distancia en Y desde el centro del pixel hasta el punto. Es un valor entre 0 y 1
|
| 693 |
* @param kernel valor del pixel y alrededor
|
| 694 |
* @return valor del pixel
|
| 695 |
*/
|
| 696 |
private double getInverseDistanceValue(double dx, double dy, double[] kernel) { |
| 697 |
double z = 0.0, n = 0.0, d; |
| 698 |
d = 1.0 / Math.sqrt(dx * dx + dy * dy); |
| 699 |
z += d * kernel[0];
|
| 700 |
n += d; |
| 701 |
|
| 702 |
d = 1.0 / Math.sqrt((1.0 - dx) * ( 1.0 - dx) + dy * dy); |
| 703 |
z += d * kernel[1];
|
| 704 |
n += d; |
| 705 |
|
| 706 |
d = 1.0 / Math.sqrt(dx*dx + (1.0-dy)*(1.0-dy)); |
| 707 |
z += d * kernel[2];
|
| 708 |
n += d; |
| 709 |
|
| 710 |
d = 1.0 / Math.sqrt((1.0 - dx) *( 1.0 - dx) + (1.0 - dy) * (1.0 - dy)); |
| 711 |
z += d * kernel[3];
|
| 712 |
n += d; |
| 713 |
|
| 714 |
double b = 0; |
| 715 |
if(n > 0.0) |
| 716 |
b = (z / n); |
| 717 |
return b;
|
| 718 |
} |
| 719 |
|
| 720 |
/**
|
| 721 |
* Obtiene un kernel de 4x4 elementos. Si alguno de los elementos se sale de la imagen
|
| 722 |
* , por ejemplo en los bordes devuelve null.
|
| 723 |
* @param x
|
| 724 |
* @param y
|
| 725 |
* @param band
|
| 726 |
* @return
|
| 727 |
*/
|
| 728 |
private double[][] get4x4Submatrix(int x, int y, int band) { |
| 729 |
int ix, iy, px, py;
|
| 730 |
double[][] z_xy = new double[4][4]; |
| 731 |
|
| 732 |
for(iy = 0, py = y - 1; iy < 4; iy++, py++) { |
| 733 |
for(ix = 0, px = x - 1; ix < 4; ix++, px++) { |
| 734 |
if (!buffer.isInside(px, py))
|
| 735 |
return null; |
| 736 |
else {
|
| 737 |
switch(buffer.getDataType()) {
|
| 738 |
case IBuffer.TYPE_BYTE: z_xy[ix][iy] = (buffer.getElemByte(py, px, band) & 0xff); break; |
| 739 |
case IBuffer.TYPE_SHORT: z_xy[ix][iy] = (buffer.getElemShort(py, px, band) & 0xffff); break; |
| 740 |
case IBuffer.TYPE_INT: z_xy[ix][iy] = (buffer.getElemInt(py, px, band) & 0xffffffff); break; |
| 741 |
case IBuffer.TYPE_FLOAT: z_xy[ix][iy] = buffer.getElemFloat(py, px, band); break; |
| 742 |
case IBuffer.TYPE_DOUBLE: z_xy[ix][iy] = buffer.getElemDouble(py, px, band); break; |
| 743 |
} |
| 744 |
} |
| 745 |
} |
| 746 |
} |
| 747 |
return z_xy;
|
| 748 |
} |
| 749 |
|
| 750 |
/**
|
| 751 |
* Obtiene un kernel de cuatro elemento que corresponden a los pixeles (x, y), (x + 1, y),
|
| 752 |
* (x, y + 1), (x + 1, y + 1). Si los pixeles x + 1 o y + 1 se salen del raster de origen
|
| 753 |
* se tomar? x e y.
|
| 754 |
* @param x Coordenada X del pixel inicial
|
| 755 |
* @param y Coordenada Y del pixel inicial
|
| 756 |
* @param band N?mero de banda.
|
| 757 |
* @return Kernel solicitado en forma de array.
|
| 758 |
*/
|
| 759 |
private double[] getKernelByte(int x, int y, int band) { |
| 760 |
double[] d = new double[4]; |
| 761 |
d[0] = (buffer.getElemByte(y, x, band) & 0xff); |
| 762 |
int nextX = ((x + 1) >= buffer.getWidth()) ? x : (x + 1); |
| 763 |
int nextY = ((y + 1) >= buffer.getHeight()) ? y : (y + 1); |
| 764 |
d[1] = (buffer.getElemByte(y, nextX, band) & 0xff); |
| 765 |
d[2] = (buffer.getElemByte(nextY, x, band) & 0xff); |
| 766 |
d[3] = (buffer.getElemByte(nextY, nextX, band) & 0xff); |
| 767 |
return d;
|
| 768 |
} |
| 769 |
|
| 770 |
/**
|
| 771 |
* Obtiene un kernel de cuatro elemento que corresponden a los pixeles (x, y), (x + 1, y),
|
| 772 |
* (x, y + 1), (x + 1, y + 1). Si los pixeles x + 1 o y + 1 se salen del raster de origen
|
| 773 |
* se tomar? x e y.
|
| 774 |
* @param x Coordenada X del pixel inicial
|
| 775 |
* @param y Coordenada Y del pixel inicial
|
| 776 |
* @param band N?mero de banda.
|
| 777 |
* @return Kernel solicitado en forma de array.
|
| 778 |
*/
|
| 779 |
private double[] getKernelShort(int x, int y, int band) { |
| 780 |
double[] d = new double[4]; |
| 781 |
d[0] = (buffer.getElemShort(y, x, band) & 0xffff); |
| 782 |
int nextX = ((x + 1) >= buffer.getWidth()) ? x : (x + 1); |
| 783 |
int nextY = ((y + 1) >= buffer.getHeight()) ? y : (y + 1); |
| 784 |
d[1] = (buffer.getElemShort(y, nextX, band) & 0xffff); |
| 785 |
d[2] = (buffer.getElemShort(nextY, x, band) & 0xffff); |
| 786 |
d[3] = (buffer.getElemShort(nextY, nextX, band) & 0xffff); |
| 787 |
return d;
|
| 788 |
} |
| 789 |
|
| 790 |
/**
|
| 791 |
* Obtiene un kernel de cuatro elemento que corresponden a los pixeles (x, y), (x + 1, y),
|
| 792 |
* (x, y + 1), (x + 1, y + 1). Si los pixeles x + 1 o y + 1 se salen del raster de origen
|
| 793 |
* se tomar? x e y.
|
| 794 |
* @param x Coordenada X del pixel inicial
|
| 795 |
* @param y Coordenada Y del pixel inicial
|
| 796 |
* @param band N?mero de banda.
|
| 797 |
* @return Kernel solicitado en forma de array.
|
| 798 |
*/
|
| 799 |
private double[] getKernelInt(int x, int y, int band) { |
| 800 |
double[] d = new double[4]; |
| 801 |
d[0] = (buffer.getElemInt(y, x, band) & 0xffffffff); |
| 802 |
int nextX = ((x + 1) >= buffer.getWidth()) ? x : (x + 1); |
| 803 |
int nextY = ((y + 1) >= buffer.getHeight()) ? y : (y + 1); |
| 804 |
d[1] = (buffer.getElemInt(y, nextX, band) & 0xffffffff); |
| 805 |
d[2] = (buffer.getElemInt(nextY, x, band) & 0xffffffff); |
| 806 |
d[3] = (buffer.getElemInt(nextY, nextX, band) & 0xffffffff); |
| 807 |
return d;
|
| 808 |
} |
| 809 |
|
| 810 |
/**
|
| 811 |
* Obtiene un kernel de cuatro elemento que corresponden a los pixeles (x, y), (x + 1, y),
|
| 812 |
* (x, y + 1), (x + 1, y + 1). Si los pixeles x + 1 o y + 1 se salen del raster de origen
|
| 813 |
* se tomar? x e y.
|
| 814 |
* @param x Coordenada X del pixel inicial
|
| 815 |
* @param y Coordenada Y del pixel inicial
|
| 816 |
* @param band N?mero de banda.
|
| 817 |
* @return Kernel solicitado en forma de array.
|
| 818 |
*/
|
| 819 |
private double[] getKernelFloat(int x, int y, int band) { |
| 820 |
double[] d = new double[4]; |
| 821 |
d[0] = buffer.getElemFloat(y, x, band);
|
| 822 |
int nextX = ((x + 1) >= buffer.getWidth()) ? x : (x + 1); |
| 823 |
int nextY = ((y + 1) >= buffer.getHeight()) ? y : (y + 1); |
| 824 |
d[1] = buffer.getElemFloat(y, nextX, band);
|
| 825 |
d[2] = buffer.getElemFloat(nextY, x, band);
|
| 826 |
d[3] = buffer.getElemFloat(nextY, nextX, band);
|
| 827 |
return d;
|
| 828 |
} |
| 829 |
|
| 830 |
/**
|
| 831 |
* Obtiene un kernel de cuatro elemento que corresponden a los pixeles (x, y), (x + 1, y),
|
| 832 |
* (x, y + 1), (x + 1, y + 1). Si los pixeles x + 1 o y + 1 se salen del raster de origen
|
| 833 |
* se tomar? x e y.
|
| 834 |
* @param x Coordenada X del pixel inicial
|
| 835 |
* @param y Coordenada Y del pixel inicial
|
| 836 |
* @param band N?mero de banda.
|
| 837 |
* @return Kernel solicitado en forma de array.
|
| 838 |
*/
|
| 839 |
private double[] getKernelDouble(int x, int y, int band) { |
| 840 |
double[] d = new double[4]; |
| 841 |
d[0] = buffer.getElemDouble(y, x, band);
|
| 842 |
int nextX = ((x + 1) >= buffer.getWidth()) ? x : (x + 1); |
| 843 |
int nextY = ((y + 1) >= buffer.getHeight()) ? y : (y + 1); |
| 844 |
d[1] = buffer.getElemDouble(y, nextX, band);
|
| 845 |
d[2] = buffer.getElemDouble(nextY, x, band);
|
| 846 |
d[3] = buffer.getElemDouble(nextY, nextX, band);
|
| 847 |
return d;
|
| 848 |
} |
| 849 |
} |