i have done 2d dft for image without using function(fft2) and received dft image.now i have to get magnitude and phase image of dft image.help me..

how can i get separated magnitude and phase image..i have done 2d dft without using built-in function.

Answer 1

[Walter Roberson]

magnitude image is abs() of the dft, plotted as an image. phase image is angle() of the dft, plotted as an image.

Remember that dft may have a large component for the first entry, representing the total offset from 0 (sum() of the signal). This tends to swamp everything else, and you need to decide how you are going to deal with it. You can use imshow(TheArray,[]) or imagesc(TheArray) but you might not get much readable in most of the image.