Stroke-number-free and stroke-order-free on-line Chinese charact

Details Stroke-number-free and stroke-order-free on-line Chinese charact Stroke-number-free and stroke-order-free on-line Chinese charact

1996-06-12

1998-08-18

Razavi, Michael

Image analysis

Pattern recognition

On-line recognition of handwritten characters

382217, G06K 900, G06K 964, G06K 968

Patent

active

057968675

ABSTRACT:
A stroke-order-free and stroke-number-free method for the on-line recognition of Chinese characters comprising the steps of: (a) inputting a handwritten input script on an on-line basis, (b) preprocessing the input script to reduce a number of possible matching template characters; (c) performing basic stroke recognition using a database of basic strokes to identify all possible basic strokes contained in the handwritten input script; (d) performing stroke correspondence using a database of stroke correspondence rules to find matching strokes in template characters for the strokes contained in the handwritten input script; and (e) performing computation of discrimination functions using a database of character patterns and a database of spatial relationships between strokes of characters to find one or more template characters with minimum error. Some of the key features of the method include: (a) the strokes recognized during the stroke correspondence are expanded to include fore strokes, back strokes, and points, in which the fore strokes are strokes that actually appear in a character, the back strokes are fictitious strokes provided to allow for stroke connections that should not appear, and the points are provided to allow for truncated back strokes in the input script; and (b) each stroke correspondence rule contains a specific set of stroke information including (i) allowed stroke types, (ii) at least one geometric feature measure, and (iii) criterion for applying the geometric feature measure; the geometric feature measure is a geometrically related characteristic measure, which can be x or y coordinates, length, or distance, associated with a particular stroke, to facilitate stroke recognition. In a preferred embodiment, eight types of stroke correspondences are allowed:(a) fore.fwdarw.fore, (2) back.fwdarw.back, (3) back.fwdarw.fore, (4) back.fwdarw.point, (5) back.fwdarw.null, (6) null.fwdarw.back, (7) fore.fwdarw.null, and (8) null.fwdarw.fore.

REFERENCES:
patent: 4689743 (1987-08-01), Chiu
patent: 4718102 (1988-01-01), Crane et al.
patent: 5212769 (1993-05-01), Pong

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