Browse Prior Art Database

Limited Vocabulary Script Reader

IP.com Disclosure Number: IPCOM000096015D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 57K

Publishing Venue

IBM

Related People

Smithline, ET: AUTHOR

Abstract

Signatures or other handwritten specimens are authenticated in this apparatus by comparing a set of derived characteristics of the specimen with those of a previously recorded sample. Document 10 on which specimen 10a is to be authenticated, contains coded identification number 10b. This addresses the specific positions in memory storing the characteristics of the known authentic sample.

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Limited Vocabulary Script Reader

Signatures or other handwritten specimens are authenticated in this apparatus by comparing a set of derived characteristics of the specimen with those of a previously recorded sample. Document 10 on which specimen 10a is to be authenticated, contains coded identification number 10b. This addresses the specific positions in memory storing the characteristics of the known authentic sample.

To compensate for variations in the signature of the same person, the apparatus normalizes the specimen to agree with the stored sample. As shown in the enlarged partial signature 10a, Edward contains at least eleven abrupt and readily detectable line detection changes A... K. These unique features define segments which are individually normalized so as to have the same number of definitive characteristics as the corresponding segment in memory storage.

Contour analyzer 20, described by Greanias, Meagher, Norman and Essinger in the January 1963 issue of the IBM Journal of Research and Development in the article, ''The Recognition of Handwritten Numerals by Contour Analysis'' scans specimen 10a, producing continuous X and Y displacement voltages, feature recognition signals, and slope or line direction signals. In the referred to machine, the feature recognition signals are logically combined to define the character. In this machine, these signals merely define the bounds of the segments for normalizing purposes and correspond to the features A... K. These can be serially numbered by feature coder 21 or specifically codally characterized by it, e. g., line end, inside corner, outside corner, etc. The line directions are resultant velocity headings, resolved into sixteen 22 1/2 degree sectors and defined as a four-bit binary word by heading encoder 22.

When contour analyzer 20 detects the first unique feature A, it stores the coordinates of it in analog store 23 and causes coder 21 to write either the number 1 into magnetic tape 25, or a number corresponding to the character of the unique feature. The succession of slopes are then written into tape 25 from encoder 22 until the second unique feature B is encountered. Tape writing now ceases. While...