thanks indeed Uli !
is gain the only criteria in rear projection screens that defines the diffusion
of the material ? Rigid Plexi should be a good choice.
I can't wait to try out your code library. It seems awesome
Samantha
Ulrich von Zadow <[EMAIL PROTECTED]> wrote: Samantha Blumberg wrote:
> Hi there
> we're just getting started here designing our own display
>
> I had a couple of questions in regard to your great tutorial
> Building_a_MultiTouch_Console
> https://www.libavg.de/wiki/index.php/Building_a_MultiTouch_Console
>
> I like your approach better than FTIR in that it know about when the
> hand is approaching the display, as opposed to just touching
>
> Is this an appropriate forum to ask questions about building the
> display ?
Yes :-).
> If not, who can we write to, to clarify or compare notes in
> regard to some points about constructions ?
>
> Our questions have to do with the camera and the display material
> which are both key to getting good results
>
> you say that you originally used a firefly MV camera from point grey
> with a wide angle lens
> I am a bit confused in that the camera is a 1/3 CCD and the lens is
> for a 1/4 CCD. How did the lens you suggest fit in the camera ?
Hm - you're right, that doesn't really make sense, but since these
lenses are so small and usually come unmarked, I won't be able to figure
out which one is actually in the MTC. It's not so hard to find
appropriate lenses, however.
> http://www.1394store.com/eshop/product.asp?dept%5Fid=56&pf%5Fid=4382
> was your criteria to get the widest angle possible ?
Just the minimum angle necessary to cover the display area.
> Your tutorial says that is the camera you were using initially
> Are you using a different camera now ?
No, same camera.
> There are good commercial machine vision cameras from:
> Hitachi, Toshiba Teli, and Sony - but I guess the availablity of a wide angle
> is an issue in construction.
> Some vendors sell IR rated lenses -- do we care about the lens being IR rated
> ?
> Probably not at the infrared nm we work at right ?
>
> We are located in the US and were thinking of getting a rear projection
> screen from Dalite. You suggest using a rear projection material with a high
> gain, 1.6 (or higher?) What structure of the material should we be looking
> for ?
> Not the dual vision which has a gain of 1, but one which will diffuse but not
> too much right ? Can you please spend a couple of more words on the structure
> of the display material ? My understanding is that it should pass a bit of IR
> but not too much right ?
With gain very close to 1, the light reflected from the fingers is
diffused so much that the camera can't find a clear contour.
Cheers,
Uli
--
Ulrich von Zadow | +49-172-7872715
Jabber: [EMAIL PROTECTED]
Skype: uzadow
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