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#1
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Re: paper: How to Get Multiple Cameras on Robot
Quote:
"Consider how much 3 of those Axis cameras would cost versus the $25 webcams." However, now that you've stated you've been getting them for $125 each can you tell us how? Last year when we bought them they were at least $150 each. If you really want to send the video back to the driver's station from a webcam(s) attached to a robot mounted laptop there are quite a few ways to achieve that. Including but not limited to installing VideoLAN and streaming it from the laptop on the robot to the laptop at the driver's station. Here's an example of how to do it in Linux (which is what the students had on our robot laptop) and even rebroadcast that to the Internet: http://www.wikihow.com/Stream-Your-Webcam BTW, this example uses UDP, not TCP, which might actually come in handy if you do start dropping packets. This method gives you fine control over both ends of the streaming, including the compression methods, transmission protocols, and the communications stacks themselves (for example you can reduce the MTU, you can increase the receive window, etc). There's no problem with the whitepaper at all it is great work. There is just more than one way to do this and there shouldn't be any problem with mentioning that considering the title of the topic in question is: "How to Get Multiple Cameras on Robot". Consider for archival sake what will happen if someone searches for that later when this topic is less recent. Sorry if I've ruffled anyone's feathers wasn't my intent. Last edited by techhelpbb : 04-04-2012 at 10:00. |
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#2
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Re: paper: How to Get Multiple Cameras on Robot
A few other things about VideoLAN that might be relevant to using it like this:
Here's a way to overlay something on the video (like the privacy filter on the Axis cameras): http://www.recipester.org/Recipe:Ove...yer_3 3186770 Here's a way to 'float' the video without the frames in an overlay. http://vollnixx.wordpress.com/2011/1...rlay-with-vlc/ If you dig around in VideoLAN you'll also find that you can basically control all it's functions remotely from devices that can't even run VideoLAN itself. For example it can run a telnet server you can connect to and issue it directions. Last edited by techhelpbb : 05-04-2012 at 09:58. |
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#3
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Re: paper: How to Get Multiple Cameras on Robot
What kind of lag can be seen when adding a second camera? Is there a significant difference in your first camera when the second one is added? Is it a good idea to add a second camera, or will it tax the control system too much?
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#4
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Re: paper: How to Get Multiple Cameras on Robot
Assuming that you are only using the 2nd camera to display on the DS, the only thing it stresses is the driver station computer. Based on my experience, the classmate can't handle two cameras without degradation. By default, everything degrades equally (both camera's and robot communication). The easiest solution is to use a more capable laptop.
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