igray is the image to be encrypted but not used in the algorithm

clc; clear all; imgname=input('Enter an image file name: ', 's'); irgb=imread(imgname);

[p,q,r]=size(irgb); m=1:p; n=1:q; ir=irgb(m,n,1); ig=irgb(m,n,2); ib=irgb(m,n,3); for m=1:p for n=1:q igray(m,n)=(0.2989*ir(m,n)+0.5870*ig(m,n)+0.1140*ib(m,n)); end end %rgb2gray(irgb)

igray=double(igray);

str=input('Enter a string: ','s'); str=double(str); len=size(str); strlen=len(1,2); k=rand([1,20],1);

m=1; n=1; str(strlen+1)=0; for i=1:strlen+1 g=str(i); a=zeros(1,7); for j=1:7 a(j)=rem(g,2); g=floor(g/2); %disp(g); if g==1 a(j+1)=rem(g,2); break end end %dec2bin(g) a; for j=1:7 if j==7 b(7)=a(1); else b(j)=a(j+1); end end %circshift(a,1,2);

    for j=1:7
       f=dec2bin(igray(m,n),8);
       f=f-'0';
       f(8)=b(j);
       %disp(f);
       m=m+1;
    if m>p
       n=n+1;
    end
    if n>q
        display('String too long to fit');
    end
  end

end %disp(a); %disp(b); % for j=0:6 % str1(i)=str1(i)+b(j+1)*(2^j); % end % end %bin2dec(b) % % str1(1,1+strlen)=0; % for i=1:strlen+1 % Emb(1,i+1)=str1(1,i); % end % % m=1; % for j=1:k:p % for i=1:k:q % if(m>strlen+2) % break; % else % igray(i,j)=Emb(m); % m=m+1; % end % end % end %disp(Emb);

% igray matrix is being written into the gif image file but is not ussed in % the encryption algorithm. f matrix is used but it is not saved into an % external image file imwrite(igray,'abcd.gif'); imtool('abcd.gif');

Answer 1

[Image Analyst]

It looks to me like igray was used:

f=dec2bin(igray(m,n),8);

[Anushree Bhatt]

Yes it was but all these changes are made to the function f but at the end we aren't using f at the end

[Image Analyst]

Yeah, so? So use if you want to.

[Anushree Bhatt]

That wasn't the doubt sir

[Image Analyst]

We don't know how to answer you. Read this and then ask an actual question (a sentence that ends with a question mark), or at least explain what the "doubt" was so that some encryption expert might be able to answer you.