Browse Prior Art Database

Improved Center of Gravity Computation in Online Handwriting Recognition

IP.com Disclosure Number: IPCOM000120385D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 44K

Publishing Venue

IBM

Related People

Chefalas, TE: AUTHOR [+3]

Abstract

A common approach for recognizing handwritten characters is to match an unknown character against prototype characters (*). For many problems, such as English handprinting, characters consist of one or more strokes, where a stroke is the writing from pen-down to pen-up. A stroke is usually filtered to reduce the number of points and possibly to smooth the data. After filtering, a stroke is a sequence of (Image Omitted) n coordinates, For stroke matching, the x and y coordinates are usually normalized by the center of gravity of the stroke or, for character matching, by the center of gravity of the character. For such normalization, the center of gravity is usually calculated as the average of the points of the stroke (or character). Thus, the x coordinate of the center of gravity of the stroke is (Image Omitted)

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 71% of the total text.

Improved Center of Gravity Computation in Online Handwriting Recognition

      A common approach for recognizing handwritten characters
is to match an unknown character against prototype characters (*).
For many problems, such as English handprinting, characters consist
of one or more strokes, where a stroke is the writing from pen-down
to pen-up.  A stroke is usually filtered to reduce the number of
points and possibly to smooth the data.  After filtering, a stroke is
a sequence of

                            (Image Omitted)

 n coordinates,
For stroke matching, the x and y coordinates are usually normalized
by the center of gravity of the stroke or, for character matching, by
the center of gravity of the character.  For such normalization, the
center of gravity is usually calculated as the average of the points
of the stroke (or character).  Thus, the x coordinate of the center
of gravity of the stroke is

                            (Image Omitted)

      This is equivalent to placing equal weights at the coordinate
points and is accurate for equally-spaced points.  Typical filtering,
however, yields points that are only approximately equally spaced.
With points not exactly equally spaced, the center of gravity
computed in this manner can be biased by the distribution of points.

      Disclosed is an improved method for computing the center of
gravity of a stroke (or character).  What is computed is...