How to imshow() to show basis images for hadamard transformation in MATLAB?

Question

I have successfully written the MATLAB code for finding the n-order hadamard matrix. Then I found the transpose of that matrix. Then I found the basis images,

e.g., A(1,3)th basis image = hadamard_matrix(:,1)*hadamard_matrix(:,2)'

But whenever I try to print it using imshow() function in matlab, it shows just a completely dark image for all the basis images.

So what is the correct approach to show such basis images in matlab ?

Thanks in advance!

Answer 1

The only reasonable explanation I can think of right now, is that your resulting matrix contains only of values smaller than, say, 0.05.

Instead of the default bounds 0 and 1, try other high/low values. For instance:

imshow(A,[min(min(A)) max(max(A))]);