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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1$\begingroup$ Could you please provide more insights on which "Fourier zoom" you are talking about? $\endgroup$– Laurent DuvalCommented Oct 12, 2017 at 18:02
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1$\begingroup$ And be aware that there are several types of DCT (which might not be an issue here) $\endgroup$– Laurent DuvalCommented Oct 12, 2017 at 18:08
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$\begingroup$ Mainly I am using fast fourrier transfor (using FFT2 command in matlab) $\endgroup$– ChiPlusPlusCommented Oct 12, 2017 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 ? $\endgroup$– Fat32Commented Oct 13, 2017 at 16:01