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Author Topic: Sensing colour at a distance  (Read 1017 times)

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Offline malexTopic starter

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Sensing colour at a distance
« on: May 14, 2009, 06:06:06 PM »
I'm trying to build a bot that can detect walls at a distance and turn accordingly.  The catch is that the walls are actually orange pylons and not a solid surface.  I understand the logic on how to implement a system to detect how far an object is, however I'm not too sure how to start detecting the colour orange at a distance (a meter or two would be sufficient I think...).

Can anyone point me to some hints?  I've read the guides on the site and they seem to only cover short distance colour detection.

Offline galannthegreat

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Re: Sensing colour at a distance
« Reply #1 on: May 14, 2009, 06:10:49 PM »
Use a Sharp IR sensor with the camera. More specifically something like this would work:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=425-2062-ND
Kurt

Offline sonictj

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Re: Sensing colour at a distance
« Reply #2 on: May 15, 2009, 04:22:59 AM »
Quote
The catch is that the walls are actually orange pylons and not a solid surface

if there are holes/discontinuities in the wall I would suggest using sonar rather than ir.  Sharp ir's have a narrow beam of detection.  As Admin says these sensors are susceptible to thin obstacles such as chair legs.  I would also recommend using a camera for the color detection.

 


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