ZBARCAM(1)							ZBar Barcode Reader							ZBARCAM(1)

NAME

       zbarcam - scan and decode bar codes from a video device

SYNOPSIS

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

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

DESCRIPTION

       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.

OPTIONS

       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

       --version
	   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.

	   enable
	       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

	   disable
	       Antonym for enable

	   emit-check
	       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

	   add-check
	       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

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

	   position
	       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

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

       --xml
	   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 http://zbar.sourceforge.net/2008/barcode.xsd

       --raw
	   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

       --prescale=WxH
	   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

EXAMPLES

       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 | upcrpc.py

       The upcrpc.py 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

SEE ALSO

       zbarimg(1)

       http://zbar.sf.net/

BUGS

       See http://sf.net/tracker/?group_id=189236&atid=928515

AUTHOR

       Jeff Brown <spadix@users.sourceforge.net>
	   Lead developer

COPYRIGHT

       Copyright (C) 2007-2009 Jeff Brown

       All Rights Reserved

zbar-0.10							    2009-10-23								ZBARCAM(1)