I have some alloy microstructure images, showing elongated grains (darker colours) and the grain boundaries (lighter colours). If I take the Fourier transform of the image, there are directional bands in the Fourier image.
Is there a relationship between the angle of these bands in the Fourier image and the orientation of the grain boundaries in the real space image?
Another observation is that if high frequencies are removed, and the inverse Fourier transform is taken, a significant amount of noise is removed, and I am mostly left with the grain boundaries of the microstructure. Is there any other kind of useful information that can be extracted from the Fourier image?