?? graylevelclass.java
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/* * Otsu Thresholding algorithm * * Copyright (c) 2003 by Christopher Mei (christopher.mei@sophia.inria.fr) * * This plugin is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * 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 plugin; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */import java.util.*;import ij.*;import ij.process.*;/** * This class implements a class of pixels with basic statistical functions. **/public class GrayLevelClass { private static float[] probabilityHistogram; public static boolean probabilityHistogramDone; public static int N; private int index; private float omega; private float mu; public GrayLevelClass(ByteProcessor img, boolean first) { if(!probabilityHistogramDone) { int[] histogram = img.getHistogram(); probabilityHistogram = new float[256]; for(int i=0; i<256 ; i++) { probabilityHistogram[i] = ((float) histogram[i])/((float) N); //IJ.write(" "+probabilityHistogram[i]); } probabilityHistogramDone = true; } if(first) { index = 1; omega = probabilityHistogram[index-1]; if(omega == 0) mu = 0; else mu = 1*probabilityHistogram[index-1]/omega; } else { index = 2; omega = 0; mu = 0; for(int i=index; i<256 ; i++) { omega += probabilityHistogram[i-1]; mu += probabilityHistogram[i-1]*i; } if(omega == 0) mu = 0; else mu /= omega; } } public void removeFromBeginning() { index++; mu = 0; omega = 0; for(int i=index; i<256 ; i++) { omega += probabilityHistogram[i-1]; mu += i*probabilityHistogram[i-1];//i* } if(omega == 0) mu = 0; else mu /= omega; /*mu *= omega; mu -= probabilityHistogram[index-2];//(index-1)* omega -= probabilityHistogram[index-2]; if(omega == 0) mu = 0; else mu /= omega;*/ } public void addToEnd() { index++; mu = 0; omega = 0; for(int i=1; i<index ; i++) { omega += probabilityHistogram[i-1]; mu += i*probabilityHistogram[i-1]; } if(omega == 0) mu = 0; else mu /= omega; /*mu *= omega; omega += probabilityHistogram[index-1]; mu += probabilityHistogram[index-1];//index* if(omega == 0) mu = 0; else mu /=omega; */ } public String toString() { StringBuffer ret = new StringBuffer(); ret.append("Index : "+index+"\n"); ret.append("Mu : "+mu+"\n"); ret.append("Omega : "+omega+"\n"); /*for(int i=0; i<10; i++) { ret.append( "\n" ); }*/ return ret.toString(); } public float getMu() { return mu; } public float getOmega() { return omega; } public int getThreshold() { return index; }}
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