This filter was an important development in signal processing the idea similar to a moving average that averages a large window of points, but instead of just averaging the points it performs a least squares fit.
Updated: For the Time Noise Reduce there is now a derivative order that allows the derivative to be evaluated.
Requires Jama,the java matrix library.

All three of the following files are required to compile the plugin

SavitzkyGolayFilter .java
The algorithm used for generating the fitting coefficients.
Time Noise Reduce Plugin .java
Plugin for filtering images in a z-stack
Image Filter Plugin .java
Used for filtering an image. (Similar to smoothing)

Here are the 3 class files again compiled with java 1.6

savitzky_golay.zip