Shen_Castan_514

Aim:
Performs gradient computation.
The plug-in returns the gradient modulus, but the java class contains also functions to get the horizontal and vertical components.
The Shen-Castan filters represents an alternative to the Canny-Deriche filter.
It is also a recursive filter and thus runs very fast.

Method:
Described in Shen and Castan, CVGIP, 1992, 54 (2) 112-133.
A dialog window asks the user which value of the parameter alfa he/she wants to use.
alfa should be close to 0 for noisy pictures and close to one for non-noisy pictures.



Illustration: