Information Technology Reference
In-Depth Information
Handwritten Categorization of Contents
Tagging is a more formal type of annotation. A tag is an annotation made on a doc-
ument that describes its contents in a very condensed form, e.g. by a keyword. The
goal of tagging is to classify documents and passages of documents in order to re-
trieve them more easily in the future. On the Web, tagging of resources is nowadays
very common. Browser bookmarks allow users to make their personal bookmarks.
Collaborative bookmarking tools such as del.icio.us
24
,digg
25
or cite-u-like
26
enable
sharing bookmarks with other users. Here we review concepts for tagging contents
that are printed on paper. Most previous work relies on pen gestures.
PapierCraft
[75] extends the PADD system for paper-based annotations, which
was introduced above. It is a gesture-based command system for paper documents,
relying on the Anoto technology and containing a rich set of pen gestures. These
gestures enable not only tagging documents, but also creating and following hy-
perlinks on documents, copy/paste within paper documents, performing Google
searches using keywords from the printed document and mailing portions of a doc-
ument to other persons. To perform a command, the user must first select the por-
tion of the document that the command applies to: Text snippets can be selected
by underlining or encircling; several lines of text can be selected with a vertical
line drawn besides the lines in the margin of the document; also arbitrary rectan-
gular areas can be selected. Then the command is specified with a specific gesture.
Cardinal direction of the
pigtail selects a command
Deinition of scope
Commands:
Tagging with
Tag1
Tagging with
Tag2
Tagging with arbitrary keyword
Hyperlink: Deine source anchor
Hyperlink: Deine target anchor
Fig. 2.17
PapierCraft's pen gestures for tagging document passages with predefined or freely-
chosen keywords and for creating hyperlinks
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http://del.icio.us
25
http://digg.com
26
http://www.citeulike.org
