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Title The Distance Transforn of a Binary Image
Author Sudhanshu Kumar
Author Email sudhanshu_cse [at] yahoo.co.in
Description This is a image processing program which performs the distance transform of a binary image.Distance transform is widely used for image thinning and finding skeleton of an image.

Category Java » Image Processing
Hits 63648
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//1:newfndistrans.java //2:A bmp monochrome image(preferably 512-512) //make the image from mspaint or any other source import java.io.*; import javax.swing.*; import java.awt.*; import java.awt.event.*; public class newfndistrans extends JFrame{ frame frm=null; File f; FileInputStream ff; Color cl; int count; int a[]; int rnum,gnum; int xsize; int ysize; final int sample=5; String str=null; newfndistrans(String str) { super(str); frm=new frame(); count=0; a=new int[8]; rnum=0;gnum=0; } public void paint(Graphics g) { int x,y,i=0,j=0,temp; try{ System.out.println("Starting"); System.out.println("filename="+frm.getfilename()); try{f=frm.getfilename(); ff=new FileInputStream(f); }catch(Exception e){ System.out.println("error in reading file"); } ff.skip(18); i=ff.read(); i=((ff.read()<<8)|i); i=((ff.read()<<16)|i); i=((ff.read()<<24)|i); xsize=i; System.out.println("width="+xsize); i=0; i=ff.read(); i=((ff.read()<<8)|i); i=((ff.read()<<16)|i); i=((ff.read()<<24)|i); ysize=i; System.out.println("Height="+ysize); ff.skip(38);//62-(2+16+4+4=26)=36, actually total=62 Bytes header //note:make it 38 for nrectbit1.bmp and nrectbit2.bmp x=0;y=ysize; int pix[][],mat1[][]; pix=new int[xsize][ysize]; mat1=new int[xsize][ysize]; System.out.println("here"); while(true) { rnum=ff.read(); //System.out.println("rnum="+rnum); if(rnum==-1)break; count=7; //image has 0 for black ,1 for white,but my convention is opposite while(rnum>0) { gnum=rnum%2; if(gnum==0)a[count]=1; else a[count]=0; count--; rnum=rnum/2; } while(count>=0) {a[count]=1;count--; } for(i=0;i<=7;i++) {if(a[i]==0)cl=new Color(255,255,255); else cl=new Color(0,0,0); pix[x][y-1]=a[i]; mat1[x][y-1]=a[i]; g.setColor(cl); g.drawRect(x,y,1,1); x++; if(x==xsize){x=0;y--;} } }//end while System.out.println("File read successfully"); //sleep for 4 seconds(4000 msec) try{Thread.sleep(4000); }catch(Exception e){} //clear the region where the image was drawn,area near the boundaries are also cleaned for(j=0;j<=ysize+2;j++) for(i=0;i<=xsize+2;i++) g.clearRect(i,j,1,1); //cleaning done above //0 means white,1 means black //perform the distance transform for(j=0;j<ysize;j++) for(i=0;i<xsize;i++) { if(mat1[i][j]==0)continue; if((j==0)||(j==ysize-1)){mat1[i][j]=1;continue;} if((i==0)||(i==xsize-1)){mat1[i][j]=1;continue;} temp=findmin(mat1[i-1][j],mat1[i-1][j-1],mat1[i][j-1],mat1[i+1][j-1]); mat1[i][j]=temp+1; } //perform the distance transform from bottom for(j=ysize-1;j>=0;j--) for(i=xsize-1;i>=0;i--) {if(mat1[i][j]==0)continue; if((j==0)||(j==ysize-1)){mat1[i][j]=1;continue;} if((i==0)||(i==xsize-1)){mat1[i][j]=1;continue;} temp=findmin(mat1[i-1][j+1],mat1[i][j+1],mat1[i+1][j+1],mat1[i+1][j]); if(temp>(mat1[i][j]-1))temp=mat1[i][j]-1; mat1[i][j]=temp+1; } int max=-9999,colornum,i1,j1,globmax=-9999; x=0;y=0; for(j=0;j<ysize-(ysize%sample);j+=sample) for(i=0;i<xsize-(xsize%sample);i+=sample) { max=-9999; for(j1=j;j1<j+sample;j1++) for(i1=i;i1<i+sample;i1++) if(max<mat1[i1][j1]) { max=mat1[i1][j1]; //xcord=i1;ycord=j1; } //out of both above for loops if(globmax<max)globmax=max; if(max!=0) { System.out.println("max="+max); for(j1=j;j1<j+sample;j1++) for(i1=i;i1<i+sample;i1++) mat1[i1][j1]=max; } } System.out.println("globmax="+globmax); for(j=0;j<ysize;j++) for(i=0;i<xsize;i++) {colornum=(mat1[i][j]*255)/globmax;//contrast enhancement colornum=255-colornum; cl=new Color(colornum,colornum,colornum); g.setColor(cl); g.drawRect(i,j,1,1); } ff.close(); System.out.println("program ends"); }//end try block catch(Exception e) {System.out.println("Error"+e.getMessage()); } } int findmin(int num1,int num2,int num3,int num4) { int min=4000; if(min>num1)min=num1; if(min>num2)min=num2; if(min>num3)min=num3; if(min>num4)min=num4; return(min); } public static void main(String args[]) { JFrame frm=new newfndistrans("Distance Transform"); frm.setSize(700,700); frm.setVisible(true); }//end main() }// end class fndistrans class frame extends JFrame{ JButton but; JFileChooser fch; String filename; File file=null; //Container con; boolean temp; frame() { super("FileReading"); setSize(700,500); setLayout(new FlowLayout()); temp=true; but=new JButton("Open the binary file"); add(but); fch=new JFileChooser(); but.addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent me) { int retval=fch.showOpenDialog(but); if(retval==JFileChooser.APPROVE_OPTION) { file=fch.getSelectedFile(); filename=file.getName(); System.out.println("1filename="+filename); temp=false; } } }); setVisible(true); while(temp); }//end constructor File getfilename() {System.out.println("filename="+filename); return file; } }

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