Dear sir/mam i have matlab code for "REGION BASED FRACTAL IMAGE COMPRESSION FOR STILL IMAGES " . Actually i dint understood the code can anybody give the line by line explanation for this code??

I = imread('lena.jpg');  
I=imresize(I,[250 250]);
%I=im2bw(I);
[x,y]=size(I);
figure,imshow(I),title('Original Image')  ;
for ii=1:x
            for jj=1:y
               if(I(ii,jj)>=0&&I(ii,jj)<=50)
                   I(ii,jj)=0;
               end
               if(I(ii,jj)>=51&&I(ii,jj)<=100)
                   I(ii,jj)=50;
               end
               if(I(ii,jj)>=101&&I(ii,jj)<=150)
                   I(ii,jj)=100;
               end
               if(I(ii,jj)>=151&&I(ii,jj)<=200)
                   I(ii,jj)=150;
               end
               if(I(ii,jj)>=201&&I(ii,jj)<=256)
                   I(ii,jj)=200;
               end

              end
  end      
   % figure,imshow(I)  ;      
  T1=I;
  T2=I;
  for i=1:x
      for j=1:y
          T2(i,j)=0;
      end
  end

w=11;

for i=1:x
    for j=1:y

          if(T2(i,j)==0)
          l1=i;
          l2=j;
           ll1=l1;
           ll2=l2;
          rl=1;
          while(rl==1)
              ll1=ll1+1;
              ll2=ll2+1;
              if(ll1<=x&&ll2<=y)
          for ii=l1:ll1
              for jj=l2:ll2
                  if(I(ii,jj)~=I(l1,l2))
                      rl=0;
                  end
              end
          end    
              else
                    rl=0;
              end
          end
          if(ll1<=x&&ll2<=y)
           for ii=l1:ll1
              for jj=l2:ll2

                  T1(ii,jj)=w;
                 if(I(i,j)~=0)
                      T2(ii,jj)=I(i,j);
                  else
                      T2(ii,jj)=1;
                  end
                   end
              end
           end  

           if(w<=250)
              w=w+24;
           else
               w=11;
           end

        end

      end
  end
  figure,imshow(T1),title('Original Image after Quad-Tree Optimization')  ;  ;
  figure,imshow(T2) ,title('Original Image after Restoration from quad-Tree')  ; ;

Answer 1

[Image Analyst]

I believe that is covered in the FAQ: http://matlab.wikia.com/wiki/FAQ#Can_you_program_up_the_algorithm_in_this_article_for_me_and_explain_it_to_me.3F but it can't hurt to ask - maybe you'll get lucky.