[hackerspaces] Laser "touch" screen?

[Lokkju Brennr]

I think if it were me I'd mod the laser, to triple-blink or something
for a click.

Loki

On Sat, Dec 17, 2011 at 4:21 PM, Russell Hubbard
<russell at vieinnovative.com> wrote:
> I'vs been meaning to try that with a wrinkle whiteboard. I wonder if there's
> enough bleedthrough IT on a green laser to trigger the remote. Or you could
> use a red/IT combo so you point with red and click with IR.
>
> On Dec 17, 2011 3:52 PM, "B F" <bakmthiscl at gmail.com> wrote:
>>
>> It occurred to me that we have touch screens and we have laser
>> pointers, but can we combine the two concepts and have a laser pointer
>> that works on a projected image from a freehand-held pointer?  I.e.,
>> you could easily implement what appears to be this if working at the
>> computer screen, but can it be done (easily) while standing at the
>> lectern beside the projector screen?
>>
>> I figure someone has probably invented this.  But if not, then a
>> simple camera specifically sensitive to the reflected red (or red+IR)
>> dot could be
>> coordinated with a few projected marks on the screen to initialize
>> the system.  After that the camera would simply see where the pointer
>> was and would respond, perhaps, to a coded strobe signal from the
>> pointer to actuate
>> whatever feature (URL link or whatever) was projected at that spot.
>>
>> Any feedback?
>>
>> Bruce Freeman
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>
>
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