Normalize the image.

Hi sir i have this program to normalized the databese of images but when i run this program i have the error in :S(:,i)=(temp-m)*std/st+m; if you help me sir and thank you a lot ????

temp=reshape(img',irow*icol,1);
%S will eventually be a (N1*N2) x M matrix.
S=[S temp];
%Normalize.%Normalize.
for i=1:size(S,2)
temp=double(S(:,i));
m=mean(temp);
st=std(temp);
S(:,i)=(temp-m)*ust/st+um;
end

[KALYAN ACHARJYA]

Please do provide all details, img, irow, icol, S?

[Adam]

Also what is 'the error' supposed to mean?! Errors come with details usually that help you work out what the problem is.

[sarine_nassima]

thank you for your reponse i have a error in this line

S(:,i)=(temp-m)*ust/st+um;

undefind ust and um ??????

[Adam]

Well, yes, given the code you provided they are undefined. The error message tells you precisely what the problem is!