Thread: How do YOU find the distance from the light?
View Single Post
  #7   Spotlight this post!  
Unread 23-02-2007, 16:19
Bongle's Avatar
Bongle Bongle is offline
Registered User
FRC #2702 (REBotics)
Team Role: Mentor
  
Join Date: Feb 2004
Rookie Year: 2002
Location: Waterloo
Posts: 1,069
Bongle has a reputation beyond reputeBongle has a reputation beyond reputeBongle has a reputation beyond reputeBongle has a reputation beyond reputeBongle has a reputation beyond reputeBongle has a reputation beyond reputeBongle has a reputation beyond reputeBongle has a reputation beyond reputeBongle has a reputation beyond reputeBongle has a reputation beyond reputeBongle has a reputation beyond repute
Send a message via MSN to Bongle
Re: How do YOU find the distance from the light?
Quote:
Originally Posted by Chris_Elston View Post
The CMU camera reports a blob or size.

If the object is far away the blob size value will be small. If the object is close to you, the blob will be a large value. A blob is the green light.
This is how 1281 did it last year. It was accurate to about +-5cm for us. We calibrated just like you did. We got blob sizes at various known distances, then figured out a matching function.

Nitpick: The blob size decreases proportional to an inverse quadratic, not linearly. Although I suppose for a range of distances it can be approximated by a linear decrease.
Last edited by Bongle : 23-02-2007 at 16:23.