need help in function

is my idea of using a function in em2.m, here is correct?? because i am getting an error,, unknown c0. here i am trying to insert bits of wm into hi.... basically im doing lsb watermarking using function

Answer 1

[Jan]

You export the variables c0, c1, ... from your function, but you do not import it in the main function. So replace

a=my_mod_idea(m,n);

by

[c0,c1,c2,c3,c4,c5,c6,c7] = my_mod_idea(m,n)

Note: Your code will run much faster, if you read the file once in the main function and provide wm as input argument to the my_mod_idea function.

The line

bitset(hi(i,k),1,c0);

does not store the results anywhere. I guess you want:

hi(i,k) = bitset(hi(i,k),1,c0);

[SHALU SINGH]

well..!! thank you, now its work correctly, but now i get problem in extracting an image, here i am using bitget function but it give a blurred image.. should i write a code as i write a code for embedding an image.