How To Build a Multitouch Table - Part 1
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- Опубліковано 6 чер 2024
- Here we look at building a multitouch setup using an infrared light source to light up fingers/objects placed on the surface and a camera to track the blobs.
Visit peauproductions.com/ for more information.
All the parts seen in these videos can be purchased at the PP store: peauproductions.com/store - Наука та технологія
The rear projection diffuser is the plane which stops the projector's image and diffuses the blobs. When an object is hovered over the touch surface it appears out of focus to the camera beneath. As it comes in contact with the touch surface, such as your finger touching it, it comes into focus and the camera sees it as a blob due to the reflected IR light. Please see our diffuser page on our website for a review of a few different materials you can use for this RP layer.
@WaYoH676 A fiducial marker is simply an object that has a pattern on the underside that is placed on the surface and the camera below sees. There are many examples of fiducial tables on the internet, for instance you can search for the ReacTable system to see a setup which the fiducial objects control music loops.
Yes you can, any type of rear projection or diffuser will work.
Yes. The tracking software outputs TUIO commands so you just need a TUIO mouse driver to convert TUIO into mouse controls.
Most applications are custom built for certain end-users, often companies looking to install such a setup. There are a few software suites/apps around that you can purchase but many more coming. Peau Productions for instance is in the process of launching our large-screen-format MT software store which you can see on our online store under the Software section (we have a few free games there now).
@dogg06 The "IR sensor" in these setups are essentially the cameras tracking the IR light blobs.
@KrunchieHD I don't know what method you are asking about, but any method that uses the LEDs along the edges should typically be at least 8-10mm thick. You want it large enough so that as much light from the LEDs goes into the sides of the acrylic.
Yes the camera driver is free to download from Code Laboratories for Windows or maccam for Mac OS. You can power the LED frame via USB but it is recommended you power them with the wall outlet.
Hi, congratulations, your table is great! Could you please tell me where can i find that tipe of sensor? and.. what is the setup for the camera.. i mean how do i fix it to trigger when the sensor gets something?
You need the LEDs in FTIR to light up the inside of the clear acrylic. When the LED light is bouncing around, it's the coupling of the silicon layer to this IR filled acrylic that creates the frustrated light point. The frustrated light is then tracked by the camera as an x,y mouse point.
Yes you can combine different methods in a single setup, though some work better combined than others.
Yes, anything to focus the projected image on will work though some diffuser/rear projection layers will have better image quality.
@kastaramation You must always have ccv up and running to have the camera tracking your fingers. You can have it start up automatically when you start your computer if you want.
We used 780nm 25mw lasers which are available on our store. Now that we carry the 850nm lasers we recommend those since they are further from visible light and your tracking will be better.
A fiducial marker is simply a pattern that the camera recognizes and is programmed to do something with it appears/rotates/moves etc. It's similar to a QR code in a way.
Hello. great video thanks for sharing.
i saw it several times and maybe i am tired and i can not see something that is clear but the question is that i want to make this for bars/pubs and i want to put a glass or acrilic in the top.
As i see in every model i will always touch the rear projection screen or a silicon screen so the time to break in a bar is very slow.
are there any metoth to put the glass on the top and have the good effect when you put a glass or you just want to play with it?
dude this makes sense but how did you get the ir leds to track your fingers
sweet thanks and another question what projector is recommended can it be a cheap one that has HDMI built in
@ONixaO Yes you can use plexiglass as it's the same thing as acrylic.
I've read the book and i like the video so much .. however i don't know from where to buy the endlighten acrylic for the DSI setup i can't figure it out on the peauproduction .. what is the size i should go with as well ?
@PeauProductions i know but how did you get the ir to follow and light up you fingers
The infrared lit-up fingers are tracked by a camera placed underneath the touch surface, which is hooked to a computer that processes the tracked image and converts the touch points into x,y mouse movement.
Would that then be similar to the pinch zoom functions on common touch phones/tablets?
That depends on your projector and its projection capabilities (such as the projection distance needed to make the desired 32" image). You should get a short throw projector and then measure by hand what the projection throw distance is. Then build your box around that.
when doing an ftir or any other technology with the software you install can you control windows as you would with a mouse
You have to take the LCD completely apart and place the camera below the LCD image layer. Top to bottom on a typical DSI LCD setup is: Mar Resist Clear Acrylic -> Endlighten -> LCD layer -> Diffuser from Backlight -> Clear Acrylic for support of LCD layer. You can get mar Resist Endlighten to reduce your layers. The camera goes in the bottom of the box. You will want to add additional white LEDs for a brighter backlight.
The PS Eye camera is attached to the computer via USB. The LEDs are simply plugged into the electrical outlet. The projector is inside the box and the video cable runs out a hole to the computer on the ground.
For the DSI version, you say that you can mount a LCD setup under the Endlighten Acrylic... how would that work and can you make a vid for that?
is there an attachment i could buy or make to turn a normal projector into a short throw projector?
Yes you can use any projector you'd like
hey! I have a question with de FTIR did ypu put the led frame right next to the acrylic piece or the led frame is under or above the acrylic?
@TheMrRocksar What parts are you looking to buy?
@0X1D1Z3D There are many setups shown in this video, but the acrylic in most of them was about 6mm thick. The larger the setup the thicker you need to go.
If you need a sealed, glass top surface you will need to look into making only the DSI or Rear DI methods. These methods locate the LEDs and rear projection layer underneath the top touch layer.
@Vorror44 Just take the LCD apart and place the LCD matrix under the Endlighten. Please see the NUIGroup Forums for people who have built LCD DSI setups.
I've been searching for software to run on the table but can only find basic packs from Microsoft and various simple games. Are there any commercial games or applications to buy yet? I'd hate to build it and not have much to run on it.
which one of the five methods do you recommend buliding?
How do you hook up the infrared camera to the projector on the FTIR method ? Or do you hook it up to the computer? Can you please tell me if i need to download any software for this to work. I am seriously considering building this. Thanks for the inspiration :)
what type of ir lasers did you you use
Thanks .. is it possible to send me a link for that as ive been to their wbsite but all I can get is a description no huy option that I am aware of
@hotelspaz Yes but you have to take the TV apart then though. If you want to use a TV then you're better off using an Infrared Touch Frame. See our store for pricing.
how is the LED camera attached to the computer ?? and is your projector within the computer?
what are the dimensions of the box you are using? i want to make something close to the height of a coffee table 20-24" but i do not know if that would be too short. so basically what is the shortest height i can use to project a 32" screen.
wait so what type of leds do you have to use? cause i wanna use the strip ones
@KrunchieHD Yes, but some models, such as the short throw projectors work better since they produce a larger image from less distance.
@MyJesusfreak45 Not typically unless the manufacturer sells one. You can use a mirror to bend the projected image path to make a setup with a shorter height.
can i get the drivers from internet ?? would CCV software work with if a make only a frame with LED fitted in it , attached to computer via usb ...
what material is the best option, a sheet of glass or acrylic?
greetings..!!!
In a FTIR setup you place the LED frame around the clear acrylic
What if i just wanted to have the frame with LED in it .. and then i give them power from wall outlet ... then what software would i need .. i dont need a camera in all this ..i want an frame which i can place on top of my pc screen and it gets converted into a touch screen..
can you use any projecter?
You need to use infrared LEDs. If you want to use the strip LEDs you can find those in two different versions on our store.
The laser setup seems pretty simple, but it depends how long the diode will last. It will be fun to sculpt in 3d with multi-touch :D
what give the best picture. as in picture performance. HD or no?
Depends on if you use a LCD or Projector and whether you have some of the parts already. You can build them for as cheap as a few hundred USD.
@PeauProductions can i use normal webcam for this???can't find on nuigroup
i made the FTIR and i have the LEDs BUT i downloaded touchlip (software) but it doesn't work :/ is there other softwares or a way on how to make it work?
You hook the camera and projector to the computer which takes care of the image processing using a tracking program such as CCV. Please see the LEARN section of our main site for lots of information.
Hi,
I am about to build an FTIR Table.
I have some questions:
At the LED Frame, how much is the approximate distance between two IR LEDs?
How many LEDs should I use per Meter?
Could I use a IR LED Strip? (Basically, to avoid soldering/wiring)
And how should the LEDs be placed at the frame? Should the Acrylic be drilled to fit the LEDs?
Thanks in Advance.
@dogg06 Yes you can but the software to determine where the object is between the diode and receiver would take awhile to figure out. We sell Infrared Touch Frames that are ready to use frames using this type of detection (no camera). See our online store for pricing and sizes.
Hey just a rough estimate, how much everything would cost when you finish build something like this? If I did it on my own.
You can use a normal webcamera but you need to cut out the IR blocking glass filter inside the camera's original lens. You illuminate your fingers with IR light and webcameras off the shelf can't see IR light so you have to modify the lens. We sell modified PS Eye cameras on our store if you want to purchase one ready to go.
@kastaramation Once you have the camera attached, use a tracking program such as CCV (ccv.nuigroup.com)
@TheMrRocksar If you are in the Southern CA area then you can get the parts from our shop, otherwise you can buy them online from us.
What exactly is a rear projection diffuser?
can you use this to web browse. e.g could i search youtube
@TheMrRocksar Please see the peauproductions store for pricing on the components needed to make these setups
No, we use a modified PS Eye camera. You can find more information on our store.
No, the pinch/zoom function is simply a gesture that you do with your fingers
Can you give me an opinion? I have build a FTIR-one myself, but i have to do too much pressure to get a bright blob May the compliant layer be too thin? Thanks for the video!
Yes, it may be too thin or incorrectly made. Also, the edges of your acrylic may not be polished "glass-smooth" enough or your LEDs too few or not bright enough.
You cannot use a Kinect camera on a setup such as described in these videos because the IR laser grid emitted but the Kinect cannot pass through a diffuser on these touch screens. You can build a setup using the Kinect but you won't be able to touch the display surface. You have to use a typical IR computer camera for this.
how thick is the acrylic?
Hi! nice vid, im starting up a business which requires a 100 inch touch tables. From this vid is it enough to learn or there are more things i need to know before i start making.....reply is much appreciated thank you :)
+Gaurav Shetty Please browse the Nuigroup Forums for more information.
did you use a regular webcam?
Thank you
I was wondering whether a keyboard can be then plugged in the computer and the multi touch table would become a full out Windows computer touch (once also the TUIO mouse driver software is installed). Is that correct?
Yes, that is correct
@scamslat Please post on the NUI Group forum with specific build questions
@PeauProductions thanks when i make this i ask you when i have questions
Thanks for the response, would you be able to provide a schematic diagram of a Rear DI setup? I'm a beginner to this and would love to learn more about building one for my home.
+Gurch Jheeta No, sorry. You can check out the NUI Group forums and wiki for help though.
You want to space the LEDs less than 1" (2.5cm) apart if possible, or buy the LED ribbon we sell (easier).
Drilling acrylic isn't necessary, just put it flush against the LEDs.
Can i use kinect? And not camra or this laser's?
Are the LED Lights IR Lights?
how many LEDS for a 30 inch FTIR display
can you say the name of the sofware you are using? where can i buy the DSI projection material?
also how do i mod the camera, and what lens i have to use?
Depends on which software you're asking about, please specify.
You can get projection material and Endlighten from Evonik.
See our other video on how to modify the PS Eye camera, or purchase a modded one here: www.peauproductions.com/collections/playstation-eye-products
No idea what lens we used, this video was shot a long time ago. You need one that will work for your setup (FOV requirements).
That depends on the method you choose. Please watch the video to learn about the different techniques you can use.
@LmaoFIFA Yes all you need is to use a TUIO mouse driver to emulate a mouse on a normal desktop
You want to put LEDs around all 4 sides spaced less than 1" apart (2.5cm).
can i use white polimer sheet ??
Hi, would you be able to provide a link to the camera used inside the box?
+Gurch Jheeta www.peauproductions.com/collections/playstation-eye-products
What settings should be made on ccv? Ccv not detecting camera... Please help
Please post in NUI Group forum for help
whats a fiducial marker?
No, you need to use a modified web camera or cctv camera.
Do you have to use a M12 set up camera? where did you buy it at?
Yes you will need to use a good focus m12 or CS lens camera. We sell everything you need in our online store.
Hello! How do you imagine to use this frame ( 12:10 ) as LCD touch frame? Surely something more is needed, some IR detector line on at least two branches of the frame?
EDIT:
I've just read your reply for this question on instructables.com but I don't understand what you mean by saying "separate the layers so that the camera is between the backlight and the image producing layer (LCD matrix)." This camera would have to have AOV almost 180 degrees as I understand...
+drakedakes You separate the layers of the LCD a large distance, so that the camera FOV sees the entire LCD image. In the example box shown in these videos the backlight is under the camera on the bottom of the box.
this may be a stupid question...but in the first setup you showed, the leds that run around the edge, are they IR leds?
Yes
@KrunchieHD Choosing which method to build depends on a lot of factors such as size, lighting conditions, budget, planned usage, etc. You can send us an email to get some help if you'd like. Please use the contact form on our website.
how do you make the edges of the acrylic clear enough? (Without Laser Cutting)
+WeFixIt You can use high grit sandpaper (1000+) and then polishing compound, or just have the acrylic company do it. Also, you can look into flame polishing if you're careful.
At the end of the day, is this multi-touch a full out computer though? Meaning, is it like a windows computer made into a touch screen table? Thank you!
These screens replace a screen and depending on their reliability, the input devices (mouse/keyboard).
Even the ones totally home made with a normal computer Windows and projector your touch becomes like the normal mouse? Or only some limited tools can be used? Lastly, is it possible to do it on a MAC computer? Thank you so much!
CCV outputs TUIO so you need a TUIO mouse driver. On Mac you will have more limited control because the OS doesn't support a multi-touch mouse driver.
Yes HD is best.
You need to get the Endlighten directly from Evonik if you are a USA or Europe customer. If you are elsewhere please contact us through our site with your inquiry and we'll put a quote together for you.