Using FFT for data compression step is this a lossy method?

tojeena · Feb 11, 2013

thylacine1975 · Feb 12, 2013

Not necessarily - it depends what you do with the FFT output. If you threshold it/quantize it/throw something away, then yes it is.
Alternatively, if you preserve *all* of the phase/frequency output data, and use it to reconstruct your original signal via the IFFT, then no it's not.

The FFT is simply a transform, and doesn't change the overall signal (information) entropy - it just moves it around. It's not lossy unless you start throwing information away.

tojeena · Feb 13, 2013

thylacine1975 said:
Not necessarily - it depends what you do with the FFT output. If you threshold it/quantize it/throw something away, then yes it is.
Alternatively, if you preserve *all* of the phase/frequency output data, and use it to reconstruct your original signal via the IFFT, then no it's not.

The FFT is simply a transform, and doesn't change the overall signal (information) entropy - it just moves it around. It's not lossy unless you start throwing information away.

Thank you,I would like to use fft for image as a pre processing step for compression using rice codes.

Using FFT for data compression step is this a lossy method?

tojeena

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thylacine1975

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tojeena

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Using FFT for data compression step is this a lossy method?

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