Method and device for character segmentation

Image analysis – Histogram processing – For setting a threshold

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382 41, 382 48, G06K 934

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044661215

ABSTRACT:
Method and device for segmenting aligned characters. Each character is converted into a pattern of image elements. The image elements form columns and rows. The grey-values of the image elements are summed per column and the summed column values are put in relation with a fixed number of columns per character (1). After the outermost character position on a line has been found (2), a first segmenting process is carried out on the basis of a first probable distance between characters (3). After the segmenting process has been carried out for several different character distances (S.sub.1 -S.sub.n), the correlation factor is determined (6), by means of which the segmentation, which precedes the character recognition, is carried out.

REFERENCES:
patent: 4206442 (1980-06-01), Miyazaki et al.
Wissenschaftliche Berichte A.E.G.-Telefunken, vol. 47, No. 3/4, (1974), J. Schurmann: "Bildvorbereitung fur die Automatische Zeichenerkennung", p. 90, T/M 99.
IBM Technical Disclosure Bulletin, vol. 21, No. 9, Feb. 1979, D. Bishop et al.: "Character Recognition Approach Involving Histogram Classification, pp. 3461-3467.
IBM Technical Disclosure Bulletin, vol. 14, No. 10, 1972, (Mar.), R. Baumgartner: "Character Pitch Determination", pp. 3104-3107.
IBM Technical Disclosure Bulletin, vol. 23, No. 3, Aug. 1980, C. Jih: "Segmentation Method for Fixed-pitch and Machine Printed Documents", p. 1194.
IBM Technical Disclosure Bulletin, vol. 15, No. 2, 1971, (Mar.), R. Hoffman et al.: "Segmentation Method for Recognition of Machine-printed Characters", pp. 153-165.

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