This Demo is adapted from the original program written by
Christian Brechbuehler at ETH Zürich.
You can change values by moving the sliders; typing in numbers takes
effect only when you move any of the sliders. Click on the picture to
stop / restart the animation.
A 2D contour is reconstructed from its elliptic Fourier descriptor.
The curious may look at the source code.
F. P. Kuhl and Ch. R. Giardina. Elliptic fourier features of a closed contour. Computer Graphics and Image Processing, 18(3):236-258, March 1982.