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Posted by on May 15, 2007, 5:20 am
Hi All
I have a tank robot with a embedded PC on it. I communicate with it
using 802.11g, i also mounted a wifi amplifier. I want to put a camera
on it, can capture video back, what should i do?
!!! buy a wireless camera is not my choice, because the camera's
antenna is not good enough. My idea is to buy a video card, insert it
into the embedded PC, send the video back through the wireless. But
most of the capture card doesn't come with a linux driver and sdk.
even it has, how can i streamming the video back? by using what linux
tool?
thanks
from Peter (cmk128@hotmail.com)
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Posted by Jeff Shirley on May 15, 2007, 1:11 pm
cmk128@hotmail.com wrote:
> I have a tank robot with a embedded PC on it. I communicate with it
> using 802.11g, i also mounted a wifi amplifier. I want to put a camera
> on it, can capture video back, what should i do?
> !!! buy a wireless camera is not my choice, because the camera's
> antenna is not good enough. My idea is to buy a video card, insert it
> into the embedded PC, send the video back through the wireless. But
> most of the capture card doesn't come with a linux driver and sdk.
> even it has, how can i streamming the video back? by using what linux
> tool?
Hi Peter.
My Linux robot uses just a cheap Logitech-clone USB webcam, and the
Video4Linux software. I can display video from the robot on a laptop (with
an admittedly slow refresh rate) using xawtv (IIRC).
Jeff.
--
Jeff Shirley
spamzilla@mindspring.com
"Bill Gates is filthy rich, but that doesn't mean I want to be married to him."
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Posted by on May 15, 2007, 8:53 pm
Jeff Shirley ¼g¹D¡G
> cmk128@hotmail.com wrote:
> > I have a tank robot with a embedded PC on it. I communicate with it
> > using 802.11g, i also mounted a wifi amplifier. I want to put a camera
> > on it, can capture video back, what should i do?
> > !!! buy a wireless camera is not my choice, because the camera's
> > antenna is not good enough. My idea is to buy a video card, insert it
> > into the embedded PC, send the video back through the wireless. But
> > most of the capture card doesn't come with a linux driver and sdk.
> > even it has, how can i streamming the video back? by using what linux
> > tool?
> Hi Peter.
> My Linux robot uses just a cheap Logitech-clone USB webcam, and the
> Video4Linux software. I can display video from the robot on a laptop (with
> an admittedly slow refresh rate) using xawtv (IIRC).
> Jeff.
> --
> Jeff Shirley
> spamzilla@mindspring.com
> "Bill Gates is filthy rich, but that doesn't mean I want to be married to him."
Hi Jeff
I have read the xawtv website, it doesn't say that it can transfer
the video back through the network. So how can you do it? And what is
IIRC?
thanks
from Peter (cmk128@hotmail.com)
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Posted by D Herring on May 15, 2007, 9:33 pm
cmk128@hotmail.com wrote:
> Jeff Shirley ¼g¹D¡G
>> cmk128@hotmail.com wrote:
>>> I have a tank robot with a embedded PC on it. I communicate with it
>>> using 802.11g, i also mounted a wifi amplifier. I want to put a camera
>>> on it, can capture video back, what should i do?
>>> !!! buy a wireless camera is not my choice, because the camera's
>>> antenna is not good enough. My idea is to buy a video card, insert it
>>> into the embedded PC, send the video back through the wireless. But
>>> most of the capture card doesn't come with a linux driver and sdk.
>>> even it has, how can i streamming the video back? by using what linux
>>> tool?
>> My Linux robot uses just a cheap Logitech-clone USB webcam, and the
>> Video4Linux software. I can display video from the robot on a laptop (with
>> an admittedly slow refresh rate) using xawtv (IIRC).
...
> I have read the xawtv website, it doesn't say that it can transfer
> the video back through the network. So how can you do it? And what is
> IIRC?
IIRC -- if I remember/recall correctly
Is your SBC capable of running a videolan server? http://www.videolan.org/
That's a full-featured streaming solution.
If not, its rather easy to write a streaming video server (assuming you
don't need the greatest compression).
I wrote some code that takes a video stream, compresses each frame using
jpeg, and then sends the frames out over the network.
http://androdna.com/pubsvn/compvision/trunk/NetSend.cpp
http://androdna.com/pubsvn/compvision/trunk/NetReceive.cpp
This code uses the Qt4 GUI system, not exactly an "embedded" library,
but the basic idea is simple enough to implement. libjpeg and a little
network code should be sufficient.
HTH (hope that helps),
Daniel
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Posted by Jeff Shirley on May 17, 2007, 3:35 pm
cmk128@hotmail.com wrote:
[snip]
>> My Linux robot uses just a cheap Logitech-clone USB webcam, and the
>> Video4Linux software. I can display video from the robot on a laptop (with
>> an admittedly slow refresh rate) using xawtv (IIRC).
[snip]
> I have read the xawtv website, it doesn't say that it can transfer
> the video back through the network. So how can you do it? And what is
> IIRC?
Peter,
I was not sure I remembered the xawtv program name correctly. Apparently I
did.
My laptop runs Linux also, so I just set the DISPLAY variable of my telnet
session to the robot to point at the laptop and start xawtv. Voila (ah, the
joys of the X window system).
Note that this method is far too inefficient/slow to do much with, but hey, it
was easy, and it works. Some sort of UDP-based video feed would undoubtedly
perform better.
Jeff.
--
Jeff Shirley
spamkills@mindspring.com
"Bill Gates is filthy rich, but that doesn't mean I want to be married to him."
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> using 802.11g, i also mounted a wifi amplifier. I want to put a camera
> on it, can capture video back, what should i do?