11/28 Does anyone here have any experience with reading bar codes from
cell phone displays? Can be any encoding mechanism (semacode, etc.)
I'm mainly interested in whether most cell phones allow reading with
conventional laser scanners or require some sort of weird optical
contrast <DEAD>scanner--mticket.net<DEAD> is an example of how this is done, but
I haven't been able to figure out the actual scanning tech. -John
\_ I've been curious about this myself. Could you try it using
a CueCat and various cell phones?
\_ I got some info back from mticket--apparently an "optical
scanner" like what http://www.trinitymobile.co.uk have will work well,
he said that "laser scanners have difficulty reading from 100%
of mobile phones", which makes sense. -John
\_ you are trying to read a barcode off a cell phone display? most
barcode has specified size. And I am not sure a "laser scanner" is
necessary to read a barcode. Cell phone in Japan and Korea can
read 2D barcode using built-in cameras. No laser there.
\_ That wasn't the question--I know there are apps that can read
barcode contents (including 2D bar codes) via cellphone
cameras. 2D codes allow more condensed encoding of info than
1D--that's most of what you use for e-tickets. I've found some
infos and apparently cell phone displays have problems with
red light in barcode light scanners--if you only use green
light, it seems to work fine. Also, there are optical pattern
contrast scanners which do this--if anyone is curious about
it, I'll gladly share. -John
\_ You are talking about two things here. Optical recognization
off the cell phone display being one, barcode being another.
Due to rigid specification of barcode, I am not sure
reading barcode off a cell phone display can be done or not.
Optical recognization off the cell phone display seems to be
a completely different subject, eventhough my instinct
wasn't able to find an application for it yet. Exactly
what are you trying to achieve? kngharv
\_ I know they're 2 different things. I am trying to read
a 1D or 2D barcode off a cell phone display. My conclusion
is that there are two ways of doing it--"optical" scanners
and laser scanners. The point being that the laser
scanners do not work well with red light. You _can_
read a bar code via optical recognition. This is used
for a lot of purposes, including concert and train tickets
(just introduced for trains here). I'm trying to do it
for user authentication at non-networked PCs. -John |