??? Error using ==> times Matrix dimensions must agree.

I am doing lsb watermarking, in which when i am calculating Normalized correlation, I m getting the above error.

NC = sum(sum(bin_img .* share12))/ sum(sum(bin_img .* bin_img))

where bin_img is original watermark

Cdata 64*64 logical

colormap 2*3 double

And share12 is recovered share (recovered as a part of visual secret sharing)

cdata 64* 128 logical

colormap 2*3 double

when i m trying to resize the share12 as the size of bin_img, I am getting the error.

??? Error using ==> iptcheckinput

Function IMRESIZE expected its second input, [MROWS NCOLS], to be
positive.

I m not able to find the problem, plzz do help .....

[Wayne King]

You need to show us the relevant part of the code where imresize() is being called. It's also giving you a very good idea of what the problem is from the error message.

[ankita]

// code part where, i using imresize()

share12 = im2bw(share12);

Ms=size(bin_img,1); %Height

Ns=size(bin_img,2);

share12 = imresize(share12,[Ms,Ns]);

imwrite(sh,'share12.bmp');

Answer 1

[Walter Roberson]

bin_img is empty, so the size is 0 which is not positive.

[ankita]

thnk you sir, You solved my problem.