Browse Prior Art Database

Method of Handling Confusable Characters Across Subsets in Online Handwriting Recognition

IP.com Disclosure Number: IPCOM000106668D
Original Publication Date: 1993-Dec-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Chefalas, TE: AUTHOR [+2]

Abstract

Disclosed is a method of avoiding confusion among characters of different subsets except when such confusions can be resolved by contextual algorithms.

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This is the abbreviated version, containing approximately 71% of the total text.

Method of Handling Confusable Characters Across Subsets in Online Handwriting Recognition

      Disclosed is a method of avoiding confusion among characters of
different subsets except when such confusions can be resolved by
contextual algorithms.

      This online, handwriting recognition system uses elastic curve
matching to match an unknown character against prototype (template)
characters [*].  Matching is done on a stroke-by-stroke basis, where
a stroke is the writing from pen down to pen up.  However, characters
that belong to different subsets of the character inventory, such as
digits versus alphabetics, but are written similarly, such as a
one-stroke 5 versus S, can be confusable and difficult to recognize
accurately.

      Details of the method follow.  The character inventory is
divided into subsets: uppercase alphabetics, lowercase alphabetics,
digits, punctuation, and special symbols.  Confusable characters are
marked; for example, a single-stroke 5 is marked digit only.  The
recognition environment is characterized by appropriate flags:
uppercase only, lowercase only, alphabetic (upper or lower) only,
digit only, context, etc. (Figure).

      The recognition environment flags then determine the allowed
prototypes used in matching the unknown characters.  For example, the
digit only flag would allow matching with the one-stroke 5 because
confusion with S is not possible in that environment.  If digit and
alphabet flags are on, but the...