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<a href="http://www.muonics.net/blog/index.php?postid=15">GRL Laser Tag Rotterdam - how to and source code</a>
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<div class="newsDate" style="padding: 0px;">
February 20, 2007
</div>
<br>
<a href='http://www.flickr.com/photos/urban_data/396081005/'><img border='0' src='http://farm1.static.flickr.com/123/396081005_aeeec1c854.jpg?v=0'></a><br />
<br />
<b>UPDATE: !!!!! <a href='http://muonics.net/blog/index.php?postid=26'>LASER TAG 2002 IS RELEASED - Feb 2008</a> !!!!!</b><br />
<br />
The main event of the GRL Rotterdam tour - 'L.A.S.E.R TAG' - 60mw geek graffiti madness. <br />
Watch the <a href='http://graffitiresearchlab.com/?page_id=76'>video here</a> on the <a href='http://graffitiresearchlab.com/'>Graffiti Research Lab</a> website.<br />
<br />
In the spirt of GRL's and <a href='http://www.eyebeam.org'>Eyebeam's</a> open source beliefs, we are posting the code and executable <br />
for the Laser Tag application online for you to download, dissect, reuse and hopefully improve. The code is <br />
C++ and compiled in a super old school Codewarrior IDE for windows but it is oepnGL based and written <br />
using <a href='http://www.openFrameworks.cc'>openFrameworks</a> which is a cross platform library for writing creative code. So it should be very <br />
straight forward to run in Visual Studio, DevC++ or even xcode on a mac.<br />
<br />
In its simplest form the Laser Tag system is a camera and laptop setup, tracking a green laser point across <br />
the face of a building and generating graphics based on the laser's position which then get projected back <br />
onto the building with a high power projector.<br />
<br />
There are a bunch of things you need to do to get Laser Tag up and running yourself, so here follows the required <br />
equipment and setup instructions. This will assume that you using windows but it will also apply for other OSs too.<br />
<br />
<br />
<b>EQUIPMENT</b><br />
<br />
We used:<br />
<br />
1 PC Laptop - ASUS A8JS - Core 2 Duo 1.83 Ghz 1GB Ram Nvideo Geforce Go 7300 256MB - VGA and DVI out.<br />
1 Pansonic PTD5600U 5000 ANSI Lumens 1024x768 DLP Projector.<br />
1 Watec 221S Security/Astrononmy Camera with manual iris zoom lens.<br />
1 Bogen magic arm and super clamp.<br />
1 Pinnacle PCTV USB capture card.<br />
1 60mW Green Laser (super illegal in a lot of places and very dangerous)<br />
and loads and loads of AAA batteries.<br />
<a href='http://www.flickr.com/photos/urban_data/396081705/'><br />
<img border ='0' src='http://farm1.static.flickr.com/169/396081705_25539b75fc.jpg?v=0'><br />
</a><br />
<br />
<br />
<b>SETUP</b><br />
<br />
<b>Location:</b><br />
<br />
Choose a building or wall that the laser shows up well on. If using a building make sure the lights aren't on <br />
as this will make the tracking of the laser beam harder (also it is not a good idea to point powerful lasers <br />
at a building with people in it) . <br />
<br />
Pick a spot far enough back that the projector can overshoot the building by a couple of feet on all sides. <br />
<br />
<a href='http://www.flickr.com/photos/urban_data/396082609/'><img border ='0' src='http://farm1.static.flickr.com/115/396082609_fe4290b30c.jpg?v=0'></a><br />
<br />
<br />
<b>Alignment and calibration:</b><br />
<br />
If the building is vertically orientated and the projector can handle it, put the projector on its side so you are <br />
using the full image of the projection. <br />
<br />
Fix the projector in place and then fix the camera underneath the lens of the projector so that it is looking at the<br />
projection area. Allow the camera to see a little more than the projection area so that you can designate an area <br />
as a clear button.<br />
<br />
Make sure all the settings on the camera are set to manual - no auto exposure or gain control etc. Adjust the color <br />
balance of the camera so that it looks as natural as possible - make sure any lights in the shot don't look green as this<br />
will confuse the tracking sytem. <br />
<br />
<b>Software setup:</b><br />
<br />
Set your resolution of your screen to 1024 by 768.<br />
<br />
Connect the projector to the PC and in your display control panel set the display mode to horizontal span. <br />
This should span the Desktop across the laptop screen and the projector so that you have one large screen <br />
of 2048 by 768 resolution. If you have access to openGL and 3D preferences in the control panel, set all settings<br />
to performance. <br />
<br />
Connect the camera to the usb capture card and the capture card to the PC. You can use <a href='http://download.videohelp.com/download/amcap911.zip'>Amcap</a><br />
to make sure you can capture video okay.<br />
<br />
Start the app and you should see something like the image bellow. <br />
Follow the instructions in the diagram to align the camera to the projection surface.<br />
<br />
<img src='http://muonics.net/extras/laserguide.png'><br />
<br />
Once the camera is aligned to the projector hide the white alignment lines on the projected image by pressing L.<br />
Turn down the iris of the camera to the point where the surface is as dark as possible but the laser still shows up strong.<br />
<br />
<b>Settings:</b><br />
<br />
The settings for the app are saved in an xml file so once you have made your adjustments hit the S key to save your changes.<br />
The up and down arrows on your keyboard will run through the list of settings and the left and right arrows can adjust the values.<br />
<br />
The first settings you will want to adjust is the four at the bottom - which define the color tracking of the laser.<br />
<br />
<b>Hue Point</b> - should be the value of green that the camera sees the laser as.<br />
<b>Hue Thresh</b> - is how wide a range from the hue point it should consider.<br />
<b>Sat Thresh</b> - is the minimum amount of saturation.<br />
<b>Value Thresh</b> - is the minimum brightness.<br />
<br />
Anything that is outside the range of these settings will show up as black in the Thresh Video anything that is whithin<br />
(hopefully only the laser point) should show up white.<br />
<br />
Here is an explanation of the rest of the settings:<br />
<br />
<b>Slide</b> - slides the screen over so you can see what is being projected<br />
<b>Verticle mode</b> - if the projector is being used on its side.<br />
<b>Use blobs</b> - should stay on, blob tracking ended up being more reliable than motion difference.<br />
<b>Motion diff</b> - don't touch<br />
<b>Use camera</b> - toggle between using the live camera and an included test video.<br />
<b>Drips mode</b> - when on, small drips of paint will descend from the letter forms.<br />
<b>Fade out</b> - slowely fades the image over time - alternative to clear button.<br />
<b>Slant brush</b> - toggles chisel brush and fatcap mode<br />
<b>Clear zone</b> - Use an area of the image as a clear zone, if the laser is detected there it clears the image.<br />
<br />
<b>Brush width</b> - Size of brush<br />
<b>Drips freq</b> - How many drips you want - lower is more<br />
<b>Activity thresh</b> - This determines the time before starting a new line, the background screen should flash red whenever a new line begins.<br />
<b>Min blob size</b> - the smaller this value the more sensitive to noise it will be but also the smoother the line motion.<br />
<b>Jump dist</b> - the max distance to draw a line between two captured points, any distance greater means it starts a new line.<br />
<b>Line resolution</b> - how many points to interpolated a line with, higher number means smoother line but uses more cpu.<br />
<b>Clear X</b> - adjust x position of clear area. <br />
<b>Clear Y</b> - same for y<br />
<b>Clear thresh</b> - lower means a more sensitive clear area , higher less sensitive - adjust so that only laser point clears image.<br />
<br />
<br />
<b>NOTES</b><br />
<br />
Once everything is setup be very careful not to bump either projector or camera as even a move of a 1mm will be<br />
enough to mess the alignment.<br />
<br />
The settings are saved in settings.xml file - if you want to back up your settings for a location just zip the file and rename it.<br />
<br />
If you are pushed for framerate - try overclocking your graphics with hacked drivers from <a href='http://www.laptopvideo2go.com/index.php?drivers'>laptopvideo2go</a>,<br />
you will notice quite a difference!<br />
<br />
Press h to hide all gui except the projected image, this can also give you a bump in the framerate too.<br />
<br />
<br />
<b>DOWNLOAD</b><br />
<b>UPDATE: !!!!! <a href='http://muonics.net/blog/index.php?postid=26'>LASER TAG 2002 IS RELEASED - Feb 2008 - Download Here</a> !!!!!</b><br />
<br />
<!-- Laser tag source code and application for windows <br />
<br />
Also if you want to use the same IDE to recompile the apps:<br />
Get it here <a href='http://www.megaupload.com/?d=CMMGTRMZ'>IDE</a> link now live. <br />
Install all 3 updates and make sure you click the yes button on the last update to recompile the libs<br />
<br />
<b>UPDATE:</b><br />
I have compiled an app with S-Video support for those that asked. <br />
Put the new exe in the same folder as the old one (app/LASER_TEST_013_DAY1/bin) <br />
The app will try and capture via s-video.<br />
<a href='http://impssble.com/mirror/appSvideo.zip'>Download it here</a> -->
<br><br><br>
<div class="posted"> <a href="http://www.muonics.net/blog/index.php?postid=15">665 Comments</a></div>
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<div style="margin-left: 1px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
<a name='comment5'></a><div class="comments-body" style="margin-left: 1px;">
2007/02/20 by Scytale
• <a href='http://scytale.de/'>www</a> • <a href='http://www.muonics.net/blog/index.php?postid=15&replyto=5#commentform'>Reply</a>
<br><br>
Absolutely awesome. That's why the hacker ethic says "you can create art and beauty with a computer". Thanks for releasing the software, maybe we're going to have some fun with it. Although we might need to find a replacement for the Laser...<br />
<br />
By the way, if you don't want to get into trouble with Flickr, you should link the photos back to their corresponding photo pages.
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<div style="margin-left: 25px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
<a name='comment6'></a><div class="comments-body" style="margin-left: 25px;">
2007/02/20 by Theo
• • <a href='http://www.muonics.net/blog/index.php?postid=15&replyto=6#commentform'>Reply</a>
<br><br>
Cheers for the feedback.<br />
<br />
Didn't know that about flickr I'll take care of it before they Goatse me :)<br />
<br />
Hope you find the code useful! <br />
<br />
Theo
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<br />Comment Trackback URL : <a href='http://www.muonics.net/blog/bblog/trackback.php/15/6/'>http://www.muonics.net/blog/bblog/trackback.php/15/6/</a></div>
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<div style="margin-left: 50px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
<a name='comment1116'></a><div class="comments-body" style="margin-left: 50px;">
2008/11/22 by Paulo
• • <a href='http://www.muonics.net/blog/index.php?postid=15&replyto=1116#commentform'>Reply</a>
<br><br>
Hey there,<br />
I am a photo-journalist from Portugal, but i´ve studied in the city of Leeuwarden- Friesland- for 6 months, and one night I saw people doing these laser tags and I was simply amazed. I myself have a background of graffiti sketches and tags,so although I have followed photography I am still quite interested in the visual arts,if I am naming it wrong I apologize.I have a Clasus balance nw-128 laptop, 2.0 ghz, 128 mb graphics card, ando also a Canon MVX3i Mini DV Camcorder. I would love to get into this, but I ask if there is any equipment that you could point out to me, but something not as expensive and as professional,but that can still do a nice job? I ask not because I don´t take it seriously, but to begin I think something more accessible would suffice. <br />
I enjoyed reading and seeing the video about this iniciative.<br />
Best of luck, the world needs to see diferently!<br />
<br />
Cheers!!!
<div class="comments-post">
<br />Comment Trackback URL : <a href='http://www.muonics.net/blog/bblog/trackback.php/15/1116/'>http://www.muonics.net/blog/bblog/trackback.php/15/1116/</a></div>
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<div style="margin-left: 25px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
<a name='comment91'></a><div class="comments-body" style="margin-left: 25px;">
2007/02/23 by alberto
• <a href='http://www.laserent.com'>www</a> • <a href='http://www.muonics.net/blog/index.php?postid=15&replyto=91#commentform'>Reply</a>
<br><br>
...compliments great stuff!<br />
I wonder to try it soon with a Christie 25.000 lumen projector...and maybe change colours....real art painting...
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<div style="margin-left: 50px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
<a name='comment93'></a><div class="comments-body" style="margin-left: 50px;">
2007/02/23 by Theo
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No - from what I hear those projectors are hard to come by - and expensive! Also if they are that bright it might make it harder to didtinguish the laser point. If you have a spare one though I am up for giving it a try!
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<div style="margin-left: 25px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/03/06 by Mathieu
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Hello, I m working in a french event company. I m very fond of your "laser tag" technic. I d like to use it on a coming event in september in Paris.<br />
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Do you realize / produce / commercialize yourself this work? If yes, do you have a formal presentation and a phone number / contact to send us? If not, is this work "free of use" by other companies? I mean can we produce it ourself?<br />
<br />
Thank you in advance for your quick answer ! And well done for your work.<br />
<br />
Mathieu
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2007/11/07 by AJ
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I'm curious, will any projector work?<br />
This has to be the sweetest thing i have laid my eyes on<br />
Awesome Work<br />
And Continue your great work
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<div style="margin-left: 25px;" class="comments-head"><b>Re:</b></div>
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2011/12/12 by IPPOLITPetuhov34
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<br><br>
недорогие сантехнические работы любой сложности
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<div style="margin-left: 1px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
<a name='comment7'></a><div class="comments-body" style="margin-left: 1px;">
2007/02/20 by cb
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this is the greatest show of digital art i have ever seen. -- did you guys specifically choose the 5600u because of high lumen output ?
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<div style="margin-left: 25px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/02/20 by Theo
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<br><br>
Actually we got that one because it was liquid cooled and could be put in almost any position without damaging the bulb. Also because it was DLP you get a pretty good contrast ratio. We got two of them because we though we would need to double them up or something but we only ended needing one it was so bight.
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<a name='comment1084'></a><div class="comments-body" style="margin-left: 50px;">
2008/09/22 by battery
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<br><br>
<br />
We specialize in batteries,laptop AC adapters. All our products are brand new, with the excellent service from our laptop battery of customer service team.<br />
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2011/12/18 by ROBERSON18Carmella
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Houses are not very cheap and not everybody can buy it. But, personal loans are created to support people in such kind of cases.
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2007/02/20 by Kevin Neberman
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beautiful. I just downloaded the source code and hopefully ill have it running tonight on my projector ;D
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2007/02/20 by Anonymous
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thanks for the tut/source :)
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2007/02/20 by cale
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This is awesome! Thanks for making it open source.
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<div style="margin-left: 1px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/02/20 by Michael Flessas
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Way awesome. I'm impressed.
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2007/02/20 by BG
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Won't that blind someone?
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<div style="margin-left: 25px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
<a name='comment20'></a><div class="comments-body" style="margin-left: 25px;">
2007/02/21 by Theo
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Yeah - you have to be super careful. That is why it is better if you do it against an empty building or large wall or something. The laser snuff clip at the end was very irresponsible :)
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<a name='comment72'></a><div class="comments-body" style="margin-left: 50px;">
2007/02/22 by Stan
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<br><br>
Nice, the idiotic, but funny part of aiming that laser at a person reminded me of a very fun weapon in a great game: HALO! The glow looked exactly like the plasma pistol fully charged....... Anyways, I'm gonna try to set up a smaller scale of it, and stick it on the Remote Controlled Tank I've got, In addition to the airsoft cannon and the new GPS system so that the UAV can calibrate it! Once it's done I'll send you guys a video of the entire armada in action! Plus the laser is pretty powerful, but is small compared to the 120mW laser on the tank.... prototype for a anti-munitions defense system....
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<div style="margin-left: 1px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
<a name='comment16'></a><div class="comments-body" style="margin-left: 1px;">
2007/02/20 by Alain
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<br><br>
Hi there, great project! It makes me think of the project in Germany where they put up a huge amount of light bulbs in each window of a huge building and those lights were then controlled by people who would send SMS through a website. Can someone find the link to that site?<br />
<br />
Also, can someone post where we can purchat the 60 mW laser? I've seen one here but it looks HUGE, is that what's needed?<br />
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http://cgi.ebay.ca/New-High-Quality-Animation-Green-Laser-Disco-Lazer-60MW_W0QQitemZ140088484183QQihZ004QQcategoryZ14984QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
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<div style="margin-left: 25px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/02/21 by Theo
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The project in germany was called Blinkin Lights I think. That is a seriously large laser - what you want is the ones in the consumer electronics sections http://electronics.listings.ebay.ca/Gadgets-Other-Electronics_Laser-Pointers_W0QQfromZR4QQsacatZ94881QQsocmdZListingItemList<br />
We also bought a lot from http://www.wickedlasers.com<br />
<br />
If you are doing it on a smaller scale you won't need 60mW - you could even get away with 8mW. Obviously it is best to use the laser lowest power possible.<br />
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2007/02/20 by Alain
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Is this the camera that you are suggesting we buy for this project?<br />
<br />
http://www.spytown.com/wat-221s.html<br />
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2007/02/21 by Theo
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Yeah that is the one. Make sure you set all settings to manual and get the color balance right. Also we used this lens http://www.spytown.com/13vm2812as.html
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2007/02/21 by Giles
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The german Blibkin Lights things is here. They played Pong on the building too: http://www.blinkenlights.de/interactive.en.html
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2007/02/21 by robert
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Incredibly great! Thanks!
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2007/02/21 by Sean
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Will a 50mW laser such as the following work? (http://cgi.ebay.com/Powerful-Astronomy-50mw-50-mw-Green-Laser-Pointer-Pen_W0QQitemZ280083694171QQihZ018QQcategoryZ14954QQrdZ1QQcmdZViewItem)
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2007/02/21 by Theo
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Yes 50mW would be fine - even as low as 8mW would be okay it depends how far etc
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2008/03/10 by John Doe
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How many MW to reach the moon? Beer Company Experiments with "Moonvertising" http://moonvertising.com/public/agegate.aspx?ReturnUrl=%2fdefault.aspx&AspxAutoDetectCookieSupport=1
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<div style="margin-left: 1px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/02/21 by Sean
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When I get rich I am going to do this.
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<div style="margin-left: 1px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/02/21 by J R
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Thanks for posting the source code! I am making this my summer project. I am going to try to hook this up to a synthesizer, a sound system and make laser music with it. I will post my progress. Thanks again!!
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<div style="margin-left: 1px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/02/21 by bram
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Hi, What does this awesome machine cost?<br />
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<div style="margin-left: 25px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/02/21 by Theo
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well with all the equipment listed around $8000
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<div style="margin-left: 1px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/02/21 by binks
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Does it have to be 60mW Green Laser <br />
can it be 50mW? Its will only be on a near by wall<br />
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2007/02/21 by Theo
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you could prob get away with 8mW - 50mW would def work!
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2007/02/21 by RikkieLow
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Is there a cheaper way to do it for a school senior show project on the future of graffiti? I am broke :)<br />
thanks
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<div style="margin-left: 25px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/02/21 by Theo
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Well if you can get hold of a pc, a projector and a camera of some sort - you might be able to get it to work. The important thing with the camera is to be able to turn off all the auto 'features'
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2007/02/21 by Physics is Cool
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Will any camera work as long is its captured by the computer?
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2007/02/21 by Theo
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The important thing with the camera is to be able to turn off all the auto 'features' - So auto exposure, auto iris, backlight compensation, white balance etc.<br />
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Then in theory any camera will work.
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2007/02/21 by Jason stiebs
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Alright this is great. And I have a projector and a webcam. So in theroy this should would. But when I plug in my firewire webcam the captured input has all verticles lines but you can kinda make out colors. Is this cause im using a firewire? (note this is really short distance like 4 feet)<br />
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And if I wanted to change the lasers color to red for instance i should just change the hue point correct?<br />
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Thanks<br />
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<div style="margin-left: 25px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/02/21 by Theo
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Hmm - some firewire cameras work. DV ones don't unfortuantely. Usually if Amcap can see it, then you can use it. <br />
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With the red laser thing - that is correct, just change the hue point. The green lasers tend to appear brighter.
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<div style="margin-left: 50px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/02/22 by Anonymous
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Thank you for the reply. Well the interesting thing is Amcap does see it but like you said DV cameras won't work and thats what I'm using so I will either find a webcam or recompile the program to accept 720x720(?) and hope the computer can handle it.<br />
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Great Project/
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<div style="margin-left: 75px;" class="comments-head"><b>Re: GRL Laser Tag Rotterdam - how to and source code</b></div>
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2007/02/22 by Theo
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Hey I am almost certain the computer won't be able to handle it as pixels wise that is 4.5 times the amount of data to process. When you are doing many operations on the image even doubling the amoutn of data can be crippling.<br />
I would suggest going analog out of the DV cam and use a cheap capture card.
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2007/02/21 by Newyouth
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