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Improved Filter that Avoids Rounding Corners and Cusps in Online Handwriting Recognition

IP.com Disclosure Number: IPCOM000103924D
Original Publication Date: 1993-Feb-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Chefalas, TE: AUTHOR [+4]

Abstract

Disclosed is a method of capturing pen movements at cusps and corners more precisely. Tablet digitizers record periodically the time sequence coordinate points. They are used to record images of handwritten symbols, cursive writing, and drawings. It is usually important to capture the shape of the writing or drawing and not the precise time correspondence of the coordinate points. Therefore, it is usually appropriate to reduce the original points in a manner so as to retain only the desired properties of the images. This process is called filtering.

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Improved Filter that Avoids Rounding Corners and Cusps in Online Handwriting Recognition

      Disclosed is a method of capturing pen movements at cusps and
corners more precisely.  Tablet digitizers record periodically the
time  sequence coordinate  points.    They  are  used  to  record
images of handwritten symbols, cursive writing, and drawings.   It
is usually  important  to  capture  the shape of the writing or
drawing and not  the  precise  time  correspondence  of  the
coordinate  points.  Therefore, it is usually appropriate to reduce
the original points in a manner so as to retain  only the  desired
properties  of  the  images.   This process is called filtering.

      The basic filtering approach used  in these recognition systems
is to retain a point if it is sufficiently far from the previously
retained point [*]  This eliminates multiple points at the same
location and  points  close  to  recorded points.   A shortcoming of
this method is that it often does not record the full extent of pen
movement  at  corners  and cusps  so  that  corners  appear "rounded"
and the extent of cusps shortened.   An earlier filtering  algorithm
captured pen  movements  at  corners and cusps by trying by extending
into sharp angles [*].

      Disclosed is a method of  capturing  pen  movements  at cusps
and  corners more precisely.  Let i be an established filtered point
and k be the next point that is  suf...