This demonstration illustrates 4 types of the smoothing opertors:

1. Moving Average
   • Seperable and recursive implementation.
2. Gaussian
   • Efficient implementation by repeated exponential filtering (N=3).
3. Exponential
   • Implementation using a recursive filtering algorithm.
4. Smoothing Splines
   • [1] M. Unser, A. Aldroubi and M. Eden, "B-spline signal processing. Part II: efficient design and applications", IEEE Trans. Signal Processing, vol. 41, pp. 834-848, February 1993.

All filters are separable and are implemented recursively with a cost that independant of the window size. Each filter is characterized by its equivalent window size. The user can also specify an x-y anisotropy factor.