[OSM-dev] Drawing ways with bezier curves rather thanlinesegments

Robert Hart Robert.Hart at BuroHappold.com
Thu Jan 25 09:19:40 GMT 2007




-----Original Message-----
From: dev-bounces at openstreetmap.org on behalf of Andy Robinson
Sent: Wed 1/24/2007 11:31 PM
To: 'Barry Crabtree'; 'Andreas Brauchli'
Cc: dev at openstreetmap.org
Subject: Re: [OSM-dev] Drawing ways with bezier curves rather thanlinesegments
 
> I'll stand corrected on this but I recall we had a long discussion on bezier
> curves maybe more than a year ago, a search of the list (probably on talk at
> the time) should find something. One of the issues that was flagged at the
> time was a patent that Navtech has on bezier curves. I think it was one of
> the reasons the idea was dropped quicker than it might otherwise have been.


I think this should be investigated a bit more closely. Patents can end up being quite specific, so it may well be possible to use beziers in a way that isn't covered by their patent. Also I suspect that knowing the US patent office, there are scores of other things we are already doing that could be covered by somebody's patents....


See:
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=0&f=S&l=50&TERM1=Navigation+Technologies+Corp&FIELD1=ASNM&co1=AND&TERM2=&FIELD2=&d=PTXT

and specifically:
US Patent: 6,366,927
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.htm&r=15&f=G&l=50&d=PTXT&p=1&p=1&S1=((bezier+AND+map)+AND+roads)&OS=bezier+AND+map+and+roads&RS=((bezier+AND+map)+AND+roads)

(also this one sounds scarily familiar:
US Patent: 6,674,434
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.htm&r=11&f=G&l=50&d=PTXT&p=1&p=1&S1=((bezier+AND+map)+AND+roads)&OS=bezier+AND+map+and+roads&RS=((bezier+AND+map)+AND+roads)
)


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