Digital Filtering Methods

Savitsky - Golay filtering in 1-D.

can replace i-th point with simple "tent filter"

Yi ¬ 1 . Yi-1 + 2 . Yi + 1 . Yi+1 --------------------------------- 4

or in general Yi ¬ Snj=-n aj Yj -------------------- Snj=-n aj

If we choose aj's in appropriate manner (Savitsky - Golay), then the above formula is equivalent to computing a polynomial least square fit for each point on curve.

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