From: Rohit Khare (rohit@uci.edu)
Date: Sat Mar 04 2000 - 22:50:21 PST
>Date: Fri, 3 Mar 2000 10:05:12 -0500 (EST)
>From: Shayde <shayde@homeport.org>
>Subject: techno-fandom Just some cool geeky stuff.
>Message-ID:
><Pine.BSF.4.10.10003031003590.2382-100000@weathership.homeport.org>
>
>http://www.spatula.net/barcode/
>
>Everything you ever wanted to know about barcodes and how they're encoded,
>including a little perl script that'll generate a bar code for an
>arbitrary string...
>
>Always wanted a T-shirt that had your name in barcode form? Now you can
>do it. :)
>
>-------------------. Web-based problem management: www.stonekeep.com
>Dave Belfer-Shevett >----------------------------------------------------.
>shevett@pobox.com / 4. Who Shat in the Hat? (Dr Suesses lesser known \
>------------------< books) |
> ______________________________________________________/
UPC - ubiquitous to products in stores everywhere
Postnet - go Postal; now includes envelope generator!
Code 3 of 9 - inventory tracking, etc.
Interleaved 2 of 5 - distribution industry, game tickets
Codabar - blood banks, libraries
Code 2 of 5 - warehouses, airline tickets
Code 128 - inventory, tracking, etc
Code 16k, a 2D symbology, based on code 128. (looks really cool)
Dutch Guilder - initial spec, subject to correction
Other resources
Curious about what barcodes people are making?
PDF417 coming eventually...
==========
Code 2 of 5
Code 2 of 5 is interesting because of its similarity in design to
Postnet. Both are 2 of 5 codes, but Code 2 of 5 encodes using bar
width instead of bar height. Code 2 of 5 has been in use since the
late 1960's for airline tickets, photo developing envelopes, and
warehouse sorting systems (see The Bar Code book section 4.3.8).
Code 2 of 5 only encodes data in the bars and there are only 2 bar
widths. As such, it is a fairly inefficient code in terms of how much
space is required to encode a single digit. Each bar is followed by a
space of a size that is uniform throughout the code, typically the
same width as the narrow bar. Each code begins with a START pattern
and ends with a STOP pattern.
Here is the character pattern table. Wide & Narrow bars are denoted
with W & N respectively.
0: NNWWN
1: WNNNW
2: NWNNW
3: WWNNN
4: NNWNW
5: WNWNN
6: NWWNN
7: NNNWW
8: WNNWN
9: NWNWN
START: WWN
STOP: WNW
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