i have done 2d dft using fft2 and received phase and magnitude image.how to store that image shown using imshow in separate variable.

imshow(abs(fftshift(image)),[24 10000]). using this im getting the image but how to store it a separate variable for future operation. please tel me except Saveas . if i give a= abs(....); im getting white image of magnitude..help to solve it.

Answer 1

[Nitin]

I suspect because the values are too high. You might need to rescale your image. This should rescale your image between 0 and 1.

imshow(I,[]);

To save it, just convert it:

I = mat2gray(A, [amin amax])

You can find more info here:

The returned matrix I contains values in the range 0.0 (black) to 1.0 (full intensity or white). amin and amax are the values in A that correspond to 0.0 and 1.0.