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       zbarcam - scan and decode bar codes from a video device


       zbarcam [-qv] [--quiet] [--nodisplay] [--xml] [--verbose[=n]]
               [--prescale=WxH] [-S[symbology.]config[=value]]
               [--set [symbology.]config[=value]] [device]

       zbarcam {-h | --help | --version}


       zbarcam scans a video4linux video source (eg, a webcam) for bar codes
       and prints any decoded data to the standard output. The video stream is
       also displayed to the screen.

       device is the path to the video4linux (version 1 or 2) character device
       special file (major number 81 and minor number 0 thru 63). It defaults
       to /dev/video0

       The underlying library currently supports EAN-13 (including UPC and
       ISBN subsets), EAN-8, Code 128, Code 39, and Interleaved 2 of 5
       symbologies. The specific type of each detected symbol is printed with
       the decoded data.


       This program follows the usual GNU command line syntax. Single letter
       options may be bundled, long options start with two dashes (`-´).

       -h, --help
           Print a short help message describing command line options to
           standard output and exit

           Print program version information to standard output and exit

       -v, --verbose[=n]
           Increase debug output level. Multiple -v options create more spew.
           Alternatively specify n to set the debug level directly

       -S[symbology.]config[=value], --set [symbology.]config[=value]
           Set decoder configuration option config for symbology to value.
           value defaults to 1 if omitted.  symbology is one of ean13, ean8,
           upca, upce, isbn13, isbn10, i25, code39, code128 or the special
           value *. If symbology is omitted or *, the config will be set for
           all applicable symbologies. These are the currently recognized
           configs. Prefix a config with "no-" to negate it. Not all configs
           are appropriate for every symbology.

               Control decoding/reporting of a symbology. For symbologies
               which are just subsets of ean13 (upca, upce, isbn13, isbn10),
               this config controls whether the subsets are detected and
               reported as such. These special cases are disabled by default,
               all other symbologies default to enabled

               Antonym for enable

               Control whether check digits are included in the decoded
               output. Enabled by default. This config does not apply for
               code128, which never returns the check digit. It also not apply
               for cases where the check digit is disabled (see add-check).
               Check digits are currently not implemented for i25 or code39

               Enable decode and verification of a check digit for symbologies
               where it is optional: this will include code39 and i25, neither
               of which implements the check digit yet

               Enable escape sequences that encode the full ASCII character
               set. This would apply to code39, except that it´s not
               implemented either...

               Enable collection of symbol position information. Enabled by
               default. Currently, the position information is unusable, so
               you can save a few cycles by disabling this.

           min-length=n, max-length=n
               Bound the number of decoded characters in a valid symbol. If a
               decode result is outside the configured min/max range
               (inclusive), it will not be reported. Set to 0 to disable the
               corresponding check. This setting applies to variable-length
               symbologies: i25, code39, code128 and pdf417.  min-length
               defaults to 6 for i25 and 1 for code39 (per Code 39
               autodiscrimination recommendation); all others default to 0

           x-density=n, y-density=n
               Adjust the density of the scanner passes. Lower values scan
               more of the image at the cost of decreased performance. Setting
               to 0 disables scanning along that axis. Defaults are both 1.

       -q, --quiet
           Quiet operation; disable the audible beep otherwise emitted when a
           symbol is decoded

           Disable output video window. Video input will be scanned until the
           program is interrupted or otherwise signaled

           Stream results using an XML output format. This format wraps the
           raw data from the symbol with information about the scan in an easy
           to parse format. The latest schema is available from

           Use raw symbol data output format. This format prints symbol data
           separated by newlines without the additional symbology type
           information that is printed by default

           Request video input scaling from the camera driver. Possibly useful
           for reducing huge frames to achieve a higher frame rate. Note that
           the driver may adjust or completely ignore the scaling request


       Scan for barcodes using the second video device and pipe the resulting
       data through a script that searches for each code in a database and
       does something useful with them:

           zbarcam /dev/video1 |

       The example script included in the examples/ subdirectory of
       the distribution will make an XMLRPC call to a popular internet UPC
       database and print the product description if found.

       Scan for barcodes using the default video device and stream results to
       stdout in XML format, also disable recognition of Interleaved 2 of 5
       codes to prevent confusion with other symbologies or background noise:

           zbarcam --xml -Si25.disable

       Scan only for Code 39, without using the preview window - maybe for a
       fixed installation. To enable only Code 39, first all symbologies are
       disabled, then Code 39 is re-enabled:

           zbarcam --nodisplay -Sdisable -Scode39.enable






       Jeff Brown <>
           Lead developer


       Copyright © 2007-2009 Jeff Brown

       All Rights Reserved

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