How can I choose right filter based on unfiltered and filtered signals

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Koustubh Shirke 2020-4-1

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回答： Image Analyst 2020-4-4

Hi Matlabers

I have two signals in matlab. One is unfiltered and other is filtered. Second is just noiseless version of first unfiltered signal.

How can I find out which filter should I use to get that unfiltred signal from filtred one ?

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Birdman 2020-4-1

Can you share your signals as mat file?

Koustubh Shirke 2020-4-1

Hi, Unfortunately cant share the data. First signal is more noise, and second filtered signal is smooth

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Image Analyst 2020-4-4

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You can't tell definitively. There are lots of different filters that could give the same output of a given signal. It could be a linear filter (like a low pass filter in the time/spatial or Fourier/frequency domain, or an inverse/Wiener filter), or a non-linear filter (like a median filter or whatever).