Browse Prior Art Database

The method of distinction of similar characters by making dynamic difference masks of templates

IP.com Disclosure Number: IPCOM000010978D
Original Publication Date: 2003-Feb-06
Included in the Prior Art Database: 2003-Feb-06
Document File: 1 page(s) / 7K

Publishing Venue

IBM

Abstract

This method enables to dsitinct between similar characters.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

  The method of distinction of similar characters by making dynamic difference masks of templates

When we use optical character reader (OCR), OCR sometimes fails to distinguish between similar characters (e.g. 0 and 8). Especially when we use normalized correlation for perception of characters, the possibility of failure increases. The reason is that the method of normalized correlation processes all of area. This means that if the similar portion is larger than different one, the result might be failed. Therefore we proposed new procedure for it. I list below.
1 Compare a template to a character to read. 2 Repeat 1 until all templates compared. 3 If there are two candidates, select two templates indicating high score (T1, T2). 4 Search the center of TI by using normalized correlation. 5 Fit the center of both of templates and make exclusive new template (NT1). 6 Search the center of T2 by using normalized correlation. 7 Fit the center of both of templates and make exclusive new template (NT2). 8 Compare the character to NT1 and NT2. Decide the most similar pattern by using normalized correlation.

Disclosed by International Business Machines Corporation

1