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Character Recognition using Density Sums

IP.com Disclosure Number: IPCOM000084634D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Ruppert, W: AUTHOR

Abstract

The area of a character 1 to be recognized is scanned in two directions, which are preferably perpendicular to each other, by two measuring strips 2 and 3 extending orthogonally to scanning direction x or y. The density values determined are summed up, so that a sum plot 4 and 5, respectively, is obtained for each scanning direction x or y. Sum plots 4 and 5 can also be computed by raster scanning or another scanning method.

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Character Recognition using Density Sums

The area of a character 1 to be recognized is scanned in two directions, which are preferably perpendicular to each other, by two measuring strips 2 and 3 extending orthogonally to scanning direction x or y. The density values determined are summed up, so that a sum plot 4 and 5, respectively, is obtained for each scanning direction x or y. Sum plots 4 and 5 can also be computed by raster scanning or another scanning method.

The grand total of the density valuesin one scanning direction, which is obtained after character 1 has been fully scanned, is assumed to be 100%. The coordinates to a chosen reference point 0 of the density sum values of, for example, 25, 50, and 75% are determined. The position of these coordinates X(i), Y(i)(i = 25%, 50%, 75%) or the differences between the coordinates of the predetermined density sum values are tabularly stored for each character to be recognized. A character is recognized when the coordinates X(i), Y(i) or the differences of the predetermined coordinates sufficiently concur with the tabular values of a character.

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