Index of /kankel/ph566/examples/smoothing
Name Last modified Size
Parent Directory -
boxcar.jpg 07-Sep-2007 17:20 529K
boxcar.pro 07-Sep-2007 15:02 540
This example shows how a simple boxcar smoothing can help your eye to see a
trend that is obscured by noise. There is a short IDL program (boxcar.pro) and
an image of the output (boxcar.jpg). As we discussed in class, the boxcar is a
poorly designed filter. Nevertheless, it is quite useful. If you would like to
see some more sophisticated examples of linear digital filters, check out
Numerical Recipes on Optimal (Wiener) Filtering and Savitzky-Golay filters:
http://www.nrbook.com/a/bookcpdf/c13-3.pdf
http://www.nrbook.com/a/bookcpdf/c14-8.pdf
On the Physics 567 web page is an example of a nonlinear (median) filter that
both smooths the data and calculates a band of statistical confidence for the
result:
http://solar.physics.montana.edu/kankel/ph567/examples/median_filter/