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<varlistentry>
<term><option>-h</option></term>
<term><option>--help</option></term>
<listitem>
<simpara>Print a short help message describing command line
options to standard output and exit</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--version</option></term>
<listitem>
<simpara>Print program version information to standard output and
exit</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-v</option></term>
<term><option>--verbose<optional>=<replaceable
class="parameter">n</replaceable></optional></option></term>
<listitem>
<simpara>Increase debug output level. Multiple
<option>-v</option> options create more spew. Alternatively
specify <replaceable class="parameter">n</replaceable> to
set the debug level directly
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-S<optional><replaceable
class="parameter">symbology</replaceable>.</optional><replaceable
class="parameter">config</replaceable><optional>=<replaceable
class="parameter">value</replaceable></optional></option></term>
<term><option>--set <optional><replaceable
class="parameter">symbology</replaceable>.</optional><replaceable
class="parameter">config</replaceable><optional>=<replaceable
class="parameter">value</replaceable></optional></option></term>
<listitem>
<simpara>Set decoder configuration option <replaceable
class="parameter">config</replaceable> for <replaceable
class="parameter">symbology</replaceable> to <replaceable
class="parameter">value</replaceable>. <replaceable
class="parameter">value</replaceable> defaults to 1 if omitted.
<replaceable class="parameter">symbology</replaceable> is one of
<option>ean13</option>, <option>ean8</option>,
<option>upca</option>, <option>upce</option>,
<option>isbn13</option>, <option>isbn10</option>,
<option>i25</option>, <option>code39</option>,
<option>code128</option> or the special value <option>*</option>.
If <replaceable class="parameter">symbology</replaceable> is
omitted or <option>*</option>, the <replaceable
class="parameter">config</replaceable> will be set for all
applicable symbologies. These are the currently recognized
<replaceable class="parameter">config</replaceable>s. Prefix a
config with "no-" to negate it. Not all configs are appropriate
for every symbology.</simpara>
<variablelist>
<varlistentry>
<term><option>enable</option></term>
<listitem>
<simpara>Control decoding/reporting of a symbology. For
symbologies which are just subsets of <option>ean13</option>
(<option>upca</option>, <option>upce</option>,
<option>isbn13</option>, <option>isbn10</option>), 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</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>disable</option></term>
<listitem>
<simpara>Antonym for <option>enable</option></simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>emit-check</option></term>
<listitem>
<simpara>Control whether check digits are included in the
decoded output. Enabled by default. This config does not
apply for <option>code128</option>, which never returns the
check digit. It also not apply for cases where the check
digit is disabled (see <option>add-check</option>). Check
digits are currently not implemented for
<option>i25</option> or <option>code39</option></simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>add-check</option></term>
<listitem>
<simpara>Enable decode and verification of a check digit for
symbologies where it is optional: this will include
<option>code39</option> and <option>i25</option>, neither of
which implements the check digit yet</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>ascii</option></term>
<listitem>
<simpara>Enable escape sequences that encode the full ASCII
character set. This would apply to <option>code39</option>,
except that it's not implemented either...</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>position</option></term>
<listitem>
<simpara>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.</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>min-length=<replaceable class="parameter">n</replaceable></option></term>
<term><option>max-length=<replaceable class="parameter">n</replaceable></option></term>
<listitem>
<simpara>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: <option>i25</option>, <option>code39</option>,
<option>code128</option> and <option>pdf417</option>.
<option>min-length</option> defaults to 6 for <option>i25</option>
and 1 for <option>code39</option> (per Code 39 autodiscrimination
recommendation); all others default to 0</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><option>x-density=<replaceable class="parameter">n</replaceable></option></term>
<term><option>y-density=<replaceable class="parameter">n</replaceable></option></term>
<listitem>
<simpara>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.</simpara>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
|
