How do you do this? Laser drawing on a building from far away

[TheGizmo]

I know its been posted here before, but I can't find the link to the thread.. nor do I remember if anyone ever posted a link to a how-to but I want to do this. What do I need? Check the video out:

http://www.youtube.com/watch?v=M57p2CGviWM

 

[TheGizmo]

ooh sweet i found the howto w/ source code, here it is if anyone is interested: http://muonics.net/blog/index.php?postid=15

 

[tasmanian]

Terrorist.

 

[dighn]

that laser looks dangerously powerful.

 

[tasmanian]

It should blind you if you look into it.

 

[Rubycon]

The image you see on the building is *not* the laser. The laser pointer was used to "draw" the image and a camera hooked to a pc follows it and has a projector draw the image. So wherever the laser is pointed, a "painted" afterimage will appear.

The source code was posted a while ago. All it requires is a webcam on a USB port and a reasonably powerful (>2000 lumen) projector. I believe the PJ used in the video was around 5000 ANSI lumens. Smaller PJ's obviously won't be as bright on a building far away but still can work.

Even without a PJ, this would work on a regular TV/computer screen. The laser pointer has to be bright enough for the camera to pick up. A 5mW pointer is fine for indoors. In the video they were using a 50mW pointer which is NOT eyesafe at all - and at the end the "stunt" pulled was quite foolish. Not recommended that ANYONE do that unless you're trying out for Jackass 3. :laugh:

 

[TheGizmo]

Originally posted by: Rubycon
The image you see on the building is *not* the laser. The laser pointer was used to "draw" the image and a camera hooked to a pc follows it and has a projector draw the image. So wherever the laser is pointed, a "painted" afterimage will appear.

The source code was posted a while ago. All it requires is a webcam on a USB port and a reasonably powerful (>2000 lumen) projector. I believe the PJ used in the video was around 5000 ANSI lumens. Smaller PJ's obviously won't be as bright on a building far away but still can work.

Even without a PJ, this would work on a regular TV/computer screen. The laser pointer has to be bright enough for the camera to pick up. A 5mW pointer is fine for indoors. In the video they were using a 50mW pointer which is NOT eyesafe at all - and at the end the "stunt" pulled was quite foolish. Not recommended that ANYONE do that unless you're trying out for Jackass 3. :laugh:

haha yea, that part at the end had me cringing.. i bet that would do some permanent eye damage. can you reccomend me a laser pointer? i have a 2600 lumen projector i'd like to try this on the side of my house with my laptop, i got a webcam too. seems all i need is a powerful laser pointer

 

[Rubycon]

Originally posted by: TheGizmo


haha yea, that part at the end had me cringing.. i bet that would do some permanent eye damage. can you reccomend me a laser pointer? i have a 2600 lumen projector i'd like to try this on the side of my house with my laptop, i got a webcam too. seems all i need is a powerful laser pointer

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