Subject:
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Re: proximity detection with laser?
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 5 Jan 2001 10:26:28 GMT
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Original-From:
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Marco C. <marco@soporcel+nospam+.pt>
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Viewed:
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652 times
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At 22:48 04-01-2001 GMT, Hao-yang Wang wrote:
> The following idea just came into my mind. Will it work?
> Put a video camera and a laser projector on the mobile robot. The laser
> projector beams out a pattern of light. The camera picks up the pattern,
> then we deduce the robot's proximity by analyzing the size and shape of the
> pattern, as seen from the camera.
One of the things I'm intending to do is to put two light sources in the
robot and measure the distance between the (if available) two reflection
"points" (or er... auras)
It should work better with laser source, of course. But then, using laser,
there would be no need for two. One vibrating horizontally, drawing an
horizontal "fixed" length line could do the job. The length of the
reflected line would give the aproximate distance.
But, because a have no lasers, I thought of using the 1st technic.
I haven't had the time (nor a camera) to test this. My camcorder was big
and... errr... it's gone to the camcorders heaven.
I intend to get a Vision Command (since I don't own a webcam) as soon as my
new RIS 1.0 arrives.
All the robotics stuff I've done so far was with a CyberMaster pbrick.
As soon as I finish my project of CM<->RCX communication, I'll start
working on this subject of distance measuring through vision. Be it with
light/laser sources, or landmark analisys... whatever works best.
> In its simplest form, the laser beams out a single dot. The camera picks up
> the position of the dot, then we calculate the distance to the obstacle by
> triangulation.
Wouldn't the "one dot" technic be more dificult to compute (and more
inacurate) ?
Marco C. aka McViper
_________________________________
Work mailto:mcviper@geocities.com
Home mailto:mcviper@clix.pt
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Message has 2 Replies:
 | | Re: proximity detection with laser?
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| (...) In my current project, I mount a wireless camera on top of the mobile robot, to look for barcode tags as the landmarks. The idea is: In the computer it stores a topological map of the locations of each barcode tags. A typical session: I: (...) (23 years ago, 5-Jan-01, to lugnet.robotics)
| | | Re: proximity detection with laser?
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| (...) Just got the VC (couldn't wait for the RIS) :) It works great on my laptop, but on my main PC (with an ATI All-in-Wonder 128) the Lego Cam and the Vision Command software doesn't work because I think it tries to work with the first registered (...) (23 years ago, 8-Jan-01, to lugnet.robotics)
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Message is in Reply To:
| | proximity detection with laser?
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| The following idea just came into my mind. Will it work? Put a video camera and a laser projector on the mobile robot. The laser projector beams out a pattern of light. The camera picks up the pattern, then we deduce the robot's proximity by (...) (24 years ago, 4-Jan-01, to lugnet.robotics)
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