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Getting Started With MultiTouch
Posted: 08 October 2008 07:12 PM   [ Ignore ]   [ # 31 ]
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rbedi100: Nima isn’t doing FTIR and johannes referencing nima’s paper which isn’t FTIR. You can see nima’s LCD table on the forum, just search his name. He’s doing kinda like LLP but with LEDs. But FTIR does not require silicone to frustrate light. But, it will be extremely hard to drag without a compliant surface if doing FTIR.

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Posted: 08 October 2008 08:04 PM   [ Ignore ]   [ # 32 ]
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cerupcat
Oh, ok, I see. But geoman did do FTIR, right? [multitouch.geomentary.com] In the CRT monitor case?
rbedi100

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Posted: 08 October 2008 08:32 PM   [ Ignore ]   [ # 33 ]
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It looks like he did, yes. But like I said, FTIR isn’t dependent on a compliant surface. It works without it, but dragging performance will suffer especially on larger displays. You can always add it later.

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Posted: 08 October 2008 08:42 PM   [ Ignore ]   [ # 34 ]
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Ok, yea, that’s what I’m planning to do - everything else first, then compliant surface if necessary. I’m doing 18”, so scale shouldn’t be an issue for me.
If I use a compliant surface, it shouldn’t be Tinkerman’s textured method for LCD FTIR, correct? If not, what “method” do I use?
thx

rbedi100

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Posted: 13 October 2008 03:52 PM   [ Ignore ]   [ # 35 ]
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Very informative post, thanks!

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Posted: 23 October 2008 08:00 PM   [ Ignore ]   [ # 36 ]
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I want to program with multilib, but how should I do?
I’m a green hand!

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Posted: 23 October 2008 09:43 PM   [ Ignore ]   [ # 37 ]
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Hi!  I’m also new to this.  Maybe you could start out with some tutorials.  Good luck!

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Posted: 26 October 2008 09:33 AM   [ Ignore ]   [ # 38 ]
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Very well. Let’s study together.

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Posted: 13 November 2008 10:27 PM   [ Ignore ]   [ # 39 ]
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Hey all,
I’ve been interested in multitouch tech for some time and just stumbled onto the NUI Group page this week. It looks like an exciting community.

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Posted: 10 January 2009 06:44 PM   [ Ignore ]   [ # 40 ]
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Very helpful post, I just can’t one thing…
how will I project my screen on the surface of the screen ..?
Known that that I don’t want to have projected out side the box .. It will make shadows while moving my hand .. plus the projector I have here is 3 inch*5 inch *18 inch .. big enough ..!

Oh, answering this question may help too..
Will my camera detect -ONLY- my hand blobs in [ DI ] method even if I placed the projector inside the box ??

Thank you
Kindest regards,
Salam

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Posted: 10 January 2009 07:57 PM   [ Ignore ]   [ # 41 ]
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Hi Salam,
If you are doing a typical table-style setup, the camera needs to go in the box. You need a projection screen to project your image onto - check this wiki page out for a projection DI schematic: http://wiki.nuigroup.com/Diffused_Illumination_Plans .

Yes, your blob detection should be fine with the projector in the box - that’s how most people do it. Putting it outside is only a good option if you’re doing a wall-style setup, like Taha’s CityScape project.

hope this helps,
rbedi100

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Posted: 10 January 2009 09:24 PM   [ Ignore ]   [ # 42 ]
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@ rbedi100:
1st, it’s me Al Sayed Gamal, “Salam” is only a salute :D:D.. anyway Hi smile

2nd, yes I’m intending to have a table-style setup and I’ll use the DI schema but my question was..
Won’t the light projected “from inside the box-my computer desktop for example” may interfere with the image produced by my hand .. then the cam will not see the blobs only .. it’ll see the blobs + “My Computer Desktop”..

And I found answer minutes ago in youtube video ..
WebCam should have a IR band-pass filter .. I don’t know what exactly to do this but it sound like I’ll need to add lens to my Cam..!

Thank you “rbedi100”
>>>>>
3rd..
I want to add one more question:
I found many DLP projectors online ... one of them is shipped with a KIT with beagle board and it’s accepting almost all standard video inputs ..
Question:
Will it be helpful, specially if I’m going to make a standalone MT-Surface ?

(Salam == peace)

GaMaL

PS-If you found my not understandable, don’t worry just let me know and I’ll re explain .. I’m not native English speaker / writer smile

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Posted: 10 January 2009 09:32 PM   [ Ignore ]   [ # 43 ]
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Gamal,
Argh, I knew that...I feel like an idiot smile My apologies...I don’t know how I didn’t realize that. My family is Indian, and I’ve said that to people. *smacks self in forehead*

Yea, an IR bandpass filter blocks out all light except for a very small range of wavelengths - depending on your IR wavelength. If you use 850 nm LEDs, you want a bandpass filter that includes the 850 nm wavelength. You put it on like a lens - over your camera.

I’m not sure what the point of getting that Linux distro would be - its available free anyways...I don’t think you need it.

your english is perfectly fine smile

salaam,
rbedi100

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Posted: 10 January 2009 09:35 PM   [ Ignore ]   [ # 44 ]
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I was mistaken ..
it’s a beagle board .. on which you can install linux ..
I edited the post . :$

Thanks for quick response PAL

Salam,
GaMaL

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Posted: 10 January 2009 09:43 PM   [ Ignore ]   [ # 45 ]
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Here’s a link for the projector I’m talking about..
http://focus.ti.com/dlpdmd/docs/dlpdiscovery.tsp?sectionId=60&tabId=2235

So here’s the scenario :
I’ll have in side the box:
1-The mini-projector
2-OS+MT-Software.. I think using their KIT will limit the size of the OS to the memory built into the kit ! + the funny thing that I can’t find any stores for that thing around ..!!!!!
3-My Camera + “my filtering lens”
4-IR-lamp(s)

Outside the box:
1-My hands :p
2-USB for loading software and may be for storage mounting ..!

Thanks
Salam

--
GaMaL
Some one who wants to have a new signature every post smile

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