Subject:
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Re: Image recogination....for robots
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 24 Aug 2000 23:40:21 GMT
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Original-From:
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Richard Markham <RICHARD@MARKHAM.DEMON.saynotospamCO.UK>
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Viewed:
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900 times
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In message <011801c00d7e$1d03c2c0$b712d6d2@default>, Patel
<macx@satyam.net.in> writes
> HI there
> Ive got a cam linked to the pc i am using it with the lego linkled
> to the pc with wires. and can guide it by looking at the screen .
> now i want to give it image recogination
>
> does any one know how to recoginise images?? or just edges?? for
> starting?
> actually right now what i do is i can make it go around and i guide
> it with nqc 's joystick control, in an small window in the computer
> is the live image of what the lego sees.
>
> the problem here is that i control the enviroment for the robot.
> and i want to make it be autonomus and let it recoginise its own
> enviroment.
>
> so how to link it to the computer so that it can recoginise colors,
> or edges etc???
>
> then if this is possiable
> then
> you can let it recognice objects, colors, images , and will help in
> navigation.
> Dr Patel
You can experiment yourself, as I have done, with single frame captures.
I captured an image to a .bmp file and read it with a bit of VB code.
You can decode changes between two frames by XOR'ing each pixel and then
plot the result.
Edge detection begins by finding contrast changes. Work through a .BMP
capture file and for each pixel, check the difference in level for all
8 neighbouring pixels. If there's a difference, there's an edge.
some really simple code will show images changes and edges.
Doing it at high speed in realtime is more of a challenge though -
especially if you want to code it yourself.
--
Richard Markham
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Message is in Reply To:
 | | Image recogination....for robots
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| HI there Ive got a cam linked to the pc i am using it with the lego linkled to the pc with wires. and can guide it by looking at the screen .now i want to give it image recogination does any one know how to recoginise images?? or just edges?? for (...) (24 years ago, 24-Aug-00, to lugnet.robotics)
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