Encoding Information in Clustered-Dot Halftones

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10-08-2010

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Encoding Information in Clustered-Dot Halftones

HPL-2010-136 Encoding Information in Clustered-Dot Halftones - Ulichney, Robert; Gaubatz, Matthew; Simske, Steven
Keyword(s): Steganographic Halftone, Clustered-dot halfioning, Data-bearing Hard Copy, Printing
Abstract: While barcodes are a popular means for encoding information for printed matter, they add unsightly overt content. If an image is already part of the composition of a printed label or page, hiding information in that image is an attractive alternative to barcodes. This paper offers a new method for e ...
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LEARN ABOUT DEBIAN

xml::um

UM(3pm) 						User Contributed Perl Documentation						   UM(3pm)

NAME

       XML::UM - Convert UTF-8 strings to any encoding supported by XML::Encoding

SYNOPSIS

	use XML::UM;

	# Set directory with .xml files that comes with XML::Encoding distribution
	# Always include the trailing slash!
	$XML::UM::ENCDIR = '/home1/enno/perlModules/XML-Encoding-1.01/maps/';

	# Create the encoding routine
	my $encode = XML::UM::get_encode (
	       Encoding => 'ISO-8859-2',
	       EncodeUnmapped => &XML::UM::encode_unmapped_dec);

	# Convert a string from UTF-8 to the specified Encoding
	my $encoded_str = $encode->($utf8_str);

	# Remove circular references for garbage collection
	XML::UM::dispose_encoding ('ISO-8859-2');

DESCRIPTION

       This module provides methods to convert UTF-8 strings to any XML encoding that XML::Encoding supports. It creates mapping routines from the
       .xml files that can be found in the maps/ directory in the XML::Encoding distribution. Note that the XML::Encoding distribution does
       install the .enc files in your perl directory, but not the.xml files they were created from. That's why you have to specify $ENCDIR as in
       the SYNOPSIS.

       This implementation uses the XML::Encoding class to parse the .xml file and creates a hash that maps UTF-8 characters (each consisting of
       up to 4 bytes) to their equivalent byte sequence in the specified encoding.  Note that large mappings may consume a lot of memory!

       Future implementations may parse the .enc files directly, or do the conversions entirely in XS (i.e. C code.)

get_encode (Encoding => STRING, EncodeUnmapped => SUB)
       The central entry point to this module is the XML::UM::get_encode() method.  It forwards the call to the global $XML::UM::FACTORY, which is
       defined as an instance of XML::UM::SlowMapperFactory by default. Override this variable to plug in your own mapper factory.

       The XML::UM::SlowMapperFactory creates an instance of XML::UM::SlowMapper (and caches it for subsequent use) that reads in the .xml
       encoding file and creates a hash that maps UTF-8 characters to encoded characters.

       The get_encode() method of XML::UM::SlowMapper is called, finally, which generates an anonimous subroutine that uses the hash to convert
       multi-character UTF-8 blocks to the proper encoding.

dispose_encoding ($encoding_name)
       Call this to free the memory used by the SlowMapper for a specific encoding.  Note that in order to free the big conversion hash, the user
       should no longer have references to the subroutines generated by get_encode().

       The parameters to the get_encode() method (defined as name/value pairs) are:

       o   Encoding

	   The name of the desired encoding, e.g. 'ISO-8859-2'

       o   EncodeUnmapped (Default: &XML::UM::encode_unmapped_dec)

	   Defines how Unicode characters not found in the mapping file (of the specified encoding) are printed.  By default, they are converted
	   to decimal entity references, like '&#123;'

	   Use &XML::UM::encode_unmapped_hex for hexadecimal constants, like '&#xAB;'

CAVEATS

       I'm not exactly sure about which Unicode characters in the range (0 .. 127) should be mapped to themselves. See comments in XML/UM.pm near
       %DEFAULT_ASCII_MAPPINGS.

       The encodings that expat supports by default are currently not supported, (e.g. UTF-16, ISO-8859-1), because there are no .enc files
       available for these encodings.  This module needs some more work. If you have the time, please help!

AUTHOR

       Original Author is Enno Derksen.

       Send bug reports, hints, tips, suggestions to T.J Mather at <tjmather@tjmather.com>.

perl v5.10.1							    2010-01-03								   UM(3pm)

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