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

graph::reader::dot

Graph::Reader::Dot(3pm) 				User Contributed Perl Documentation				   Graph::Reader::Dot(3pm)

NAME

       Graph::Reader::Dot - class for reading a Graph instance from Dot format

SYNOPSIS

	   use Graph::Reader::Dot;
	   use Graph;

	   $reader = Graph::Reader::Dot->new();
	   $graph = $reader->read_graph('mygraph.dot');

DESCRIPTION

       Graph::Reader::Dot is a class for reading in a directed graph in the file format used by the dot tool (part of the AT+T graphviz package).

       Graph::Reader::Dot is a subclass of Graph::Reader, which defines the generic interface for Graph reader classes.

METHODS AND CONFIGURATION

   "new()"
       Constructor - generate a new reader instance.

	   $reader = Graph::Reader::Dot->new();

       This doesn't take any arguments.

   "read_graph()"
       Read a graph from a file:

	   $graph = $reader->read_graph( $file );

       The $file argument can be either a filename or a filehandle of a previously opened file.

   $Graph::Reader::Dot::UseNodeAttr
       Controls, if implicit node attributes given by the dot directive "node[]" will be merged into (new) nodes.  Setting it to 0 or "undef"
       (default) will not disable this feature.  Setting it to any other value will enable this feature.

   $Graph::Reader::Dot::UseEdgeAttr
       Controls, if implicit edge attributes given by the dot directive "edge[]" will be merged into edges.  Setting it to 0 or "undef" (default)
       will not disable this feature.  Setting it to any other value will enable this feature.

RESTRICTIONS

       o   Default (graph) attributes in subgraphs (i.e. inside "{}") are not processed.

       o   Sub nodes as used by dot's "record" node shape are supported.

       o   Undirected graphs will be treated as directed graphs.  This means that the "--" edge operator works as the "->" edge operator.

       o   Be aware that you are loosing scope information on writing back the graph.

       o   Multiple "node[]" or "edge[]" statements in the same scope are not correctly supported.

SEE ALSO

       http://www.graphviz.org/
	   The home page for the AT+T graphviz toolkit that includes the dot tool.

       Graph::Reader
	   The base class for Graph::Reader::Dot.

       Graph::Writer::Dot
	   Used to serialise a Graph instance in Dot format.

       Graph
	   Jarkko Hietaniemi's classes for representing directed graphs.

       Parse::Yapp
	   Another base class for Graph::Reader::Dot.  The Parse::Yapp module comes with the following copyright notice:

	   The Parse::Yapp module and its related modules and shell scripts are copyright (c) 1998-1999 Francois Desarmenien, France. All rights
	   reserved.

	   You may use and distribute them under the terms of either the GNU General Public License or the Artistic License, as specified in the
	   Perl README file.

	   If you use the "standalone parser" option so people don't need to install Parse::Yapp on their systems in order to run you software,
	   this copyright noticed should be included in your software copyright too, and the copyright notice in the embedded driver should be
	   left untouched.

AUTHOR

       Mark A. Hillebrand <mah@wjpserver.cs.uni-sb.de>

COPYRIGHT

       Copyright (c) 2001 by Mark A. Hillebrand.  All rights reserved.

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2012-02-12						   Graph::Reader::Dot(3pm)

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