Berkeley CSUA MOTD:Entry 40737
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2025/05/24 [General] UID:1000 Activity:popular
5/24    

2005/11/28-30 [Consumer/CellPhone, Computer/HW/Scanner] UID:40737 Activity:low
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
2025/05/24 [General] UID:1000 Activity:popular
5/24    

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