From: malcolm.arthur.mclean@gmail.com   
      
   I'm working on a problem where a user enters a degraded, wiggly curve (it's   
   actually created by tracing software from what might have been once a   
   rectangle, for example, but has been physically printed, then scanned, and so   
   on, so that there are plenty    
   of stray pixels picked up by the tracing software).   
      
   So basically what I want to do is sample the curve at a fairly low resolution,   
   then re-fit it, to get rid of the noise. However I want to retain the genuine   
   sharp corners. So in the rectangle case, the desired output wouldn't be a   
   mathematical rectangle,    
   but it would be four clean almost straight curves, connected by four corners   
   of almost ninety degreees.   
      
   The curve tends to go back on itself. It's like a coastline. It's  easy to   
   pick out the real curve from the noise by eye, but harder to do it   
   automatically.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)