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Simple and easy freeman Chain Code algorithm code implementation , This implementation is used to detecting edges in binary images ( 0's,1's pixels), this code start by searching the binary image until it finds a 0 (black pixel).

freeman.m
matlab code
`function []=freeman()clcm=imread('C:\Documents and Settings\Desktop\msi.bmp'); [h w d]=size(m); h; w; d; m row=0; col=0; for i=w:-1:1 % column     for j=1:1:h % row    %    m(j,i)         if(m(j,i)==0)            row=j;            col=i;           break;         end     end end  m(row,col); oldrow=row; oldcol=col; newrow=-1; newcol=-1; %while (row ~=newrow & col ~= newcol ) for i=1:300;              if(checkones(m,oldrow,oldcol)==1)%up 1         %your up is 1          if(m(oldrow,oldcol+1)==1)%righ 1             if(m(oldrow+1,oldcol)==1)%down 1                break;              else                      newrow=oldrow+1;                        newcol=oldcol;             end         else          newrow=oldrow;     newcol=oldcol+1;                           end                 else% your up is 0         if(m(oldrow,oldcol+1)==1)%down                  newrow=oldrow+1;                 newcol=oldcol;         else if(m(oldrow,oldcol+1)==0 &m(oldrow,oldcol-1)~=1)% rigth                     newrow=oldrow;                newcol=oldcol+1;              else if(m(oldrow,oldcol-1)==1)% up             newrow=oldrow-1;     newcol=oldcol;         end        end      oldrow=newrow;   oldcol=newcol;   newrow    newcol       end`

checkones.m
matlab code
`function [c]=checkones(m,row,col)       c=0; if(row==1)     c=1 else        if(m(row-1,col)==1)                         c=1 ;                end endreturn ;`

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M. S. Rakha, Ph.D.
Queen's University

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