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 _______________________________________________ libavg-users mailing list [email protected] https://mail.datenhain.de/mailman/listinfo/libavg-users
