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I am familiar with zoom using fourrier transform on an Image. I am also aware that DCT is used mainly to compress images. Meanwhile, how can someone use this transform to zoom an image?

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    $\begingroup$ Could you please provide more insights on which "Fourier zoom" you are talking about? $\endgroup$ – Laurent Duval Oct 12 '17 at 18:02
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    $\begingroup$ And be aware that there are several types of DCT (which might not be an issue here) $\endgroup$ – Laurent Duval Oct 12 '17 at 18:08
  • $\begingroup$ Mainly I am using fast fourrier transfor (using FFT2 command in matlab) $\endgroup$ – ChiPlusPlus Oct 12 '17 at 19:40
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The following IEEE pdf discusses image interpolation (aka zooming) by DCT. Have a look at it The main idea remains the same: the DCT spectra is zero padded and converted back into time to obtain the interpolated image which yields the zooming effect.

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  • $\begingroup$ @damdam092 have you seen the paper ? $\endgroup$ – Fat32 Oct 13 '17 at 16:01

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