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how to determine proper size of average filter?

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K
K on 1 May 2011
Hi all, I'd like to ask a question in order determining size for average filter. How to determine proper size of average filter if variance(square of std deviation) = 0.00006 ?
Really thanks in advance.

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Answers (1)

Jan
Jan on 3 May 2011
This depends on your definition or "proper".
There is no best choice for a filter width, because a filter is applied to distinguish the noise and the signal. Now imagine you've measured the sea-level near to a beach. If you are interested in the tides, you need an averaging filter over an hour. To measure the distribution of wave-heigths, a filter over seconds is useful. And if you want to get the influence of the climate, the filter must span some years.
Therefore you need a physical motivation to choose a filter parameter ever and the variance is not a sufficient base.

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