root / trunk / libraries / libRaster / src / org / gvsig / raster / datastruct / Histogram.java @ 12383
History | View | Annotate | Download (11.7 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.datastruct; |
20 |
|
21 |
|
22 |
|
23 |
/**
|
24 |
* Representa un histograma.
|
25 |
* @version 27/03/2007
|
26 |
* @author Nacho Brodin (nachobrodin@gmail.com)
|
27 |
*
|
28 |
*/
|
29 |
public class Histogram { |
30 |
/**
|
31 |
* Variable que representa el histograma. La primera dimensi?n es el n?mero de
|
32 |
* bandas y la segunda un array de clases. En el caso b?sico de un RGB una clase tendr? el
|
33 |
* valor m?nimo igual al m?ximo.
|
34 |
*/
|
35 |
private HistogramClass[][] histogram = null; |
36 |
private int nClasses = 0; |
37 |
|
38 |
private long[][] table = null; |
39 |
private static String[] types = {"normal", "accumulated", "logaritmic"}; |
40 |
private double min = Double.MAX_VALUE; |
41 |
private double max = Double.NEGATIVE_INFINITY; |
42 |
|
43 |
/**
|
44 |
* Constructor
|
45 |
*/
|
46 |
public Histogram(int nBands, int nClasses, double min, double max) { |
47 |
table = new long[nBands][nClasses]; |
48 |
for (int i=0; i < table.length; i++) |
49 |
for (int j = 0; j < table[0].length; j++) |
50 |
table[i][j] = 0;
|
51 |
this.min = min;
|
52 |
this.max = max;
|
53 |
this.nClasses = nClasses;
|
54 |
} |
55 |
|
56 |
/**
|
57 |
* Asigna la tabla
|
58 |
* @param t
|
59 |
*/
|
60 |
public void setTable(long[][] t) { |
61 |
table = t; |
62 |
} |
63 |
|
64 |
/**
|
65 |
* Obtiene el histograma sin modificar
|
66 |
* @return array bidimensional donde el primer elemento es el valor del pixel
|
67 |
* o rango y el segundo el n?mero de elementos que aparecen.
|
68 |
*/
|
69 |
public HistogramClass[][] getHistogram() { |
70 |
if (nClasses <= 0) |
71 |
return null; |
72 |
|
73 |
histogram = new HistogramClass[table.length][nClasses];
|
74 |
|
75 |
for (int i = 0; i < table.length; i++) { |
76 |
for (int j = 0; j < nClasses; j++) { |
77 |
HistogramClass hc = new HistogramClass( min + ((j * (max - min)) / nClasses),
|
78 |
min + (((j + 1) * (max - min)) / nClasses));
|
79 |
hc.setValue(table[i][j]); |
80 |
histogram[i][j] = hc; |
81 |
} |
82 |
} |
83 |
return histogram;
|
84 |
} |
85 |
|
86 |
/**
|
87 |
* Obtiene el n?mero de bandas del histograma
|
88 |
* @return entero que representa el n?mero de bandas
|
89 |
*/
|
90 |
public int getNumBands() { |
91 |
if (table != null) |
92 |
return table.length;
|
93 |
return 0; |
94 |
} |
95 |
|
96 |
/**
|
97 |
* Obtiene la longitud (n?mero de valores) de una banda determinada
|
98 |
* @param band Banda o obtener la longitud
|
99 |
* @return entero con la longitud de la banda
|
100 |
* rangos de valores y DataclassList.
|
101 |
*/
|
102 |
public int getBandLenght(int band) { |
103 |
if (table != null) |
104 |
return table[band].length;
|
105 |
return 0; |
106 |
} |
107 |
|
108 |
/**
|
109 |
* Obtiene el n?mero de valores o clases del histograma
|
110 |
* @return entero que representa el n?mero de valores o clases del histograma
|
111 |
*/
|
112 |
public int getNumValues() { |
113 |
return nClasses;
|
114 |
} |
115 |
|
116 |
/**
|
117 |
* Asigna un histograma
|
118 |
* @param hist histograma asignado
|
119 |
*/
|
120 |
public void setHistogram(HistogramClass[][] hist){ |
121 |
histogram = hist; |
122 |
} |
123 |
|
124 |
/**
|
125 |
* Asigna un valor para una posici?n del histograma
|
126 |
* @param band Valor del pixel o clase a asignar
|
127 |
* @param px Valor del pixel
|
128 |
* @param value Valor a asignar
|
129 |
*/
|
130 |
public void setHistogramValue(int band, double px, long value) { |
131 |
int pos = (int) ((nClasses * (px - min))/(max-min)); |
132 |
if (pos < 0) pos = 0; |
133 |
if (pos >= nClasses) pos = nClasses - 1; |
134 |
table[band][pos] = value; |
135 |
} |
136 |
|
137 |
/**
|
138 |
* Asigna un valor para una posici?n del histograma segun la posicion en las
|
139 |
* clases
|
140 |
* @param band Valor del pixel o clase a asignar
|
141 |
* @param pos Posicion dentro de la clase. Ejemplo 0..63
|
142 |
* @param value Valor a asignar
|
143 |
*/
|
144 |
public void setHistogramValueByPos(int band, int pos, long value) { |
145 |
if (pos < 0) pos = 0; |
146 |
if (pos >= nClasses) pos = nClasses - 1; |
147 |
table[band][pos] = value; |
148 |
} |
149 |
|
150 |
/**
|
151 |
* Obtiene un valor del histograma
|
152 |
* @param band N?mero de banda del valor a recuperar
|
153 |
* @param px Pixel o valor de la clase del valor a recuperar
|
154 |
* @return valor
|
155 |
*/
|
156 |
public double getHistogramValue(int band, double px) { |
157 |
if (histogram == null) getHistogram(); |
158 |
for (int i = 0; i < histogram[band].length; i++) { |
159 |
if (((HistogramClass)histogram[band][i]).isIn(px))
|
160 |
return ((HistogramClass)histogram[band][i]).getValue();
|
161 |
} |
162 |
return 0; |
163 |
} |
164 |
|
165 |
/**
|
166 |
* Obtiene un valor del histograma segun la posicion dentro de las clases
|
167 |
* @param band N?mero de banda del valor a recuperar
|
168 |
* @param px Pixel o valor de la clase del valor a recuperar
|
169 |
* @return valor
|
170 |
*/
|
171 |
public double getHistogramValueByPos(int band, int pos) { |
172 |
if (pos < 0) pos = 0; |
173 |
if (pos >= nClasses)
|
174 |
pos = nClasses - 1;
|
175 |
return table[band][pos];
|
176 |
} |
177 |
|
178 |
/**
|
179 |
* Incrementa un valor de una posici?n del histograma
|
180 |
* @param band N?mero de banda
|
181 |
* @param px Pixel o valor de la clase
|
182 |
*/
|
183 |
public void incrementPxValue(int band, double px) { |
184 |
int pos = (int) ((nClasses * (px - min)) / (max - min)); |
185 |
if (pos < 0) |
186 |
pos = 0;
|
187 |
if (pos >= nClasses)
|
188 |
pos = nClasses - 1;
|
189 |
table[band][pos]++; |
190 |
} |
191 |
|
192 |
/**
|
193 |
* Devuelve el histograma acumulado
|
194 |
* @return
|
195 |
*/
|
196 |
public HistogramClass[][] getAccumulatedHistogram() { |
197 |
if (histogram != null) { |
198 |
HistogramClass[][] hist = new HistogramClass[histogram.length][histogram[0].length]; |
199 |
for (int iBand = 0; iBand < hist.length; iBand++) { |
200 |
hist[iBand][0] = new HistogramClass(histogram[iBand][0].getMin(), histogram[iBand][0].getMax()); |
201 |
hist[iBand][0].setValue(histogram[iBand][0].getValue()); |
202 |
for (int j = 1; j < hist[iBand].length; j++) { |
203 |
hist[iBand][j] = new HistogramClass(histogram[iBand][j].getMin(), histogram[iBand][j].getMax());
|
204 |
hist[iBand][j].setValue(hist[iBand][j - 1].getValue() + histogram[iBand][j].getValue());
|
205 |
} |
206 |
} |
207 |
return hist;
|
208 |
} |
209 |
return null; |
210 |
} |
211 |
|
212 |
/**
|
213 |
* Devuelve el histograma logaritmico
|
214 |
* @return
|
215 |
*/
|
216 |
public HistogramClass[][] getLogaritmicHistogram() { |
217 |
if (histogram != null) { |
218 |
HistogramClass[][] hist = new HistogramClass[histogram.length][histogram[0].length]; |
219 |
double minim = Double.MAX_VALUE; |
220 |
for (int iBand = 0; iBand < histogram.length; iBand++) { |
221 |
for (int j = 0; j < histogram[iBand].length; j++) { |
222 |
if (minim > histogram[iBand][j].getValue())
|
223 |
minim = histogram[iBand][j].getValue(); |
224 |
} |
225 |
} |
226 |
for (int iBand = 0; iBand < histogram.length; iBand++) { |
227 |
for (int j = 0; j < histogram[iBand].length; j++) { |
228 |
hist[iBand][j] = new HistogramClass(histogram[iBand][j].getMin(), histogram[iBand][j].getMax());
|
229 |
hist[iBand][j].setValue(java.lang.Math.log(histogram[iBand][j].getValue() - minim + 1.0));
|
230 |
} |
231 |
} |
232 |
return hist;
|
233 |
} |
234 |
return null; |
235 |
|
236 |
} |
237 |
|
238 |
/**
|
239 |
* N?mero de tipos de histograma definidos en esta clase.
|
240 |
* @return entero con el n?mero de tipos definidos.
|
241 |
*/
|
242 |
public static int getHistogramTypesCount() { |
243 |
return types.length;
|
244 |
} |
245 |
|
246 |
/**
|
247 |
* Obtiene un tipo de histograma a partir de su posici?n en el array
|
248 |
* @param pos posici?n en el array del tipo a obtener
|
249 |
* @return Tipo
|
250 |
*/
|
251 |
public static String getType(int pos) { |
252 |
return types[pos];
|
253 |
} |
254 |
|
255 |
/**
|
256 |
* Obtiene el histograma correspondiente al tipo pasado por par?metro. Los tipos
|
257 |
* est?n definidos en esta misma clase de forma est?tica en la variable types.
|
258 |
* @param type Tipo a devolver
|
259 |
* @return Histograma
|
260 |
*/
|
261 |
public HistogramClass[][] getHistogramByType(String type) { |
262 |
if(type.equals(types[0])) |
263 |
return getHistogram();
|
264 |
if(type.equals(types[1])) |
265 |
return getAccumulatedHistogram();
|
266 |
if(type.equals(types[2])) |
267 |
return getLogaritmicHistogram();
|
268 |
return null; |
269 |
} |
270 |
|
271 |
/**
|
272 |
* Calculo de estad?sticas a partir de un histograma. El resultado de la funci?n es un array
|
273 |
* bidimensional donde el primer ?ndice inndica la estadistica y el segundo el n?mero de banda.
|
274 |
*
|
275 |
* <UL>
|
276 |
* <LI>m?nimo</LI>
|
277 |
* <LI>m?ximo</LI>
|
278 |
* <LI>media</LI>
|
279 |
* <LI>mediana</LI>
|
280 |
* <LI>N?mero de pixels</LI>
|
281 |
* </UL>
|
282 |
* @param histogram
|
283 |
* @param bandas solicitadas. Cada elemento del vector representa una banda. Si est? a true se calcula la
|
284 |
* estadistica para esa banda y si est? a false no se calcular?.
|
285 |
* @return
|
286 |
*/
|
287 |
public long[][] getBasicStats(boolean[] bands) { |
288 |
if (histogram == null) |
289 |
return null; |
290 |
return getBasicStats(0, histogram[0].length - 1, bands); |
291 |
} |
292 |
|
293 |
/**
|
294 |
* Calculo de estad?sticas a partir de un histograma. El resultado de la funci?n es un array
|
295 |
* bidimensional donde el primer ?ndice inndica la estadistica y el segundo el n?mero de banda.
|
296 |
*
|
297 |
* <UL>
|
298 |
* <LI>m?nimo</LI>
|
299 |
* <LI>m?ximo</LI>
|
300 |
* <LI>media</LI>
|
301 |
* <LI>mediana</LI>
|
302 |
* <LI>N?mero de pixels</LI>
|
303 |
* </UL>
|
304 |
* @param histogram
|
305 |
* @param beginPos Posici?n de inicio del histograma para contabilizar estadisticas
|
306 |
* @param endPos Posici?n de fin del histograma para contabilizar estadisticas
|
307 |
* @param bandas solicitadas. Cada elemento del vector representa una banda. Si est? a true se calcula la
|
308 |
* estadistica para esa banda y si est? a false no se calcular?.
|
309 |
* @return
|
310 |
*/
|
311 |
public long[][] getBasicStats(int beginPos2, int endPos2, boolean[] bands){ |
312 |
if (histogram == null) getHistogram(); |
313 |
|
314 |
// Preparar las posiciones para los rangos de los HistogramClass
|
315 |
int beginPos = (int) ((nClasses * (beginPos2 - min)) / (max - min)); |
316 |
if (beginPos < 0) beginPos = 0; |
317 |
if (beginPos >= nClasses) beginPos = nClasses - 1; |
318 |
int endPos = (int) ((nClasses * (endPos2 - min)) / (max - min)); |
319 |
if (endPos < 0) endPos = 0; |
320 |
if (endPos >= nClasses) endPos = nClasses - 1; |
321 |
|
322 |
//Contamos el n?mero de bandas para las cuales se calcula la estad?stica
|
323 |
int bandCount = 0; |
324 |
for (int iBand = 0; iBand < bands.length; iBand ++) |
325 |
if (bands[iBand]) bandCount ++;
|
326 |
|
327 |
int values = 5; |
328 |
long[][] res = new long[values][]; |
329 |
|
330 |
long[] min = new long[bandCount];//M?nimo |
331 |
long[] max = new long[bandCount];//M?ximo |
332 |
for (int iBand = 0; iBand < bandCount; iBand ++) { |
333 |
max[iBand] = beginPos; |
334 |
min[iBand] = endPos; |
335 |
} |
336 |
long[] average = new long[bandCount]; //Valor de pixel medio (Media) |
337 |
long[] middle = new long[bandCount]; //Mediana |
338 |
long[] nPixelsBand = new long[bandCount];//N?mero de pixels por banda |
339 |
|
340 |
int showBandCounter = 0; //Contador de bandas de las que hay calcular la estadistica |
341 |
for (int iBand = 0; iBand < histogram.length; iBand ++){ |
342 |
if(bands[iBand]){
|
343 |
int pixels = 0; //N?mero de valores por banda (entre 0 y 255) |
344 |
for(int i = beginPos; i <= endPos; i ++){ |
345 |
|
346 |
//Calculo del m?nimo
|
347 |
if(histogram[iBand][i].getValue() != 0 && i < min[showBandCounter]) |
348 |
min[showBandCounter] = i; |
349 |
|
350 |
//Calculo del m?ximo
|
351 |
if(histogram[iBand][i].getValue() != 0 && i > max[showBandCounter]) |
352 |
max[showBandCounter] = i; |
353 |
|
354 |
//Calculo del n?mero de pixeles
|
355 |
nPixelsBand[showBandCounter] += (long)histogram[iBand][i].getValue();
|
356 |
|
357 |
if(histogram[iBand][i].getValue() != 0) |
358 |
pixels ++; |
359 |
|
360 |
average[showBandCounter] += histogram[iBand][i].getValue() * i; |
361 |
} |
362 |
//Calculo de la media
|
363 |
try{
|
364 |
average[showBandCounter] /= nPixelsBand[showBandCounter]; |
365 |
}catch(ArithmeticException exc){ |
366 |
average[showBandCounter] = 0;
|
367 |
} |
368 |
|
369 |
//Calculo de mediana
|
370 |
long middlePos = nPixelsBand[showBandCounter] >> 1; |
371 |
int aux = 0; |
372 |
int i = beginPos;
|
373 |
for(i = beginPos; aux < middlePos; i++)
|
374 |
aux += histogram[iBand][i].getValue(); |
375 |
middle[showBandCounter] = i - 1;
|
376 |
|
377 |
showBandCounter ++; |
378 |
} |
379 |
} |
380 |
|
381 |
res[0] = min;
|
382 |
res[1] = max;
|
383 |
res[2] = average;
|
384 |
res[3] = middle;
|
385 |
res[4] = nPixelsBand;
|
386 |
return res;
|
387 |
} |
388 |
} |