An algorithm would be nice.. But I think I found a way to do it..

use a filter like this (the laser scans horizantally)

float filtconsts[9]=
{-1/6,
-1/6,
-1/6,
.1/6,
2/3,
1/6,
-1/6,
-1/6,
-1/6};

multiplied by the vertical pixels.. So if you add all the
constants(uniform color), you get 0.  if you have a value near the
middle of the Y, the value falls through (> 0), if its a patch above
or below center, it comes out <= 0.

Or I'll train a NN to evaluate it so it will pass \ / - | patterns and
reject all others..

andrew

On 5/29/05, William Chops Westfield <westfw@mac.com> wrote:
> >>>> What sort of filter would I use to eliminate large areas of uniform
> >>>> color but keep smaller areas?
> >>>>
> Just to clarify, are you looking for an algorithm, or the name of one
> of the commonly available "filters" (or "effects") in a high-level 
> program
> like photoshop?
> 
> BillW
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