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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Last changed April 01, 1998, G. Scott Owen, owen@siggraph.org