Why we shift zero-frequency component to center of spectrum of an image?
<pre><code>F = round(fftshift(abs(fft2(A))))
</code></pre>

<p>where A is the image.</p>

<p>I am studying contrast stretching in Digital Image Processing. I don't understand zero frequency component. I searched for it but I couldn't understand it, kindly refer some documentation about zero frequency component.</p>