FILTERSTEP2

THE BOX'S MAIN HELP:

This function filters the EDG value over the area between A and B,
using WID as the width and FLT as the filtering kernel.

EDG (input):

This must be a float.
This is the the edge to be filtered.

A (input):

This must be a float.  This is the lower threshold value.

B (input):

This must be a float.  This is the upper threshold value.

WID (input):

This must be a float. The default is 1.0.
This is the amount to overfilter the area between A and B.
For best results powers of 2 (i.e. 1,2,4,8,16,32,64) are recommended.

FLT (input):

This must be a string. The default is "catmull-rom".
This is the filter kernel to be used. The other filters
available are: "box", "triangle" or "gaussian".

OUT (output):

This function filters the EDG value over the area between A and B,
using WID as the width and FLT as the filtering kernel.

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