Image analysis – Histogram processing – For setting a threshold
Patent
1989-08-21
1992-03-31
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 46, 358464, G06K 920
Patent
active
051014483
ABSTRACT:
A document processor for processing a document image which includes both a table formed by a plurality of ruled lines, and characters to generate vector data defining the ruled lines comprises an image input device for reading an image of the document, a display for displaying the document image and a processor for processing the document image. The processor corrects a skew of the input document image, detects a successive black pixel area included in the skew-corrected image, detects a character area based on a size of a rectangle which circumscribes the successive black pixel area, and converts the image to a second document image having characters deleted and including only the ruled lines. Those line segments detected by horizontally scanning the second document image which are longer than a predetermined threshold are determined as horizontal temporary lines, and those segments detected by vertically scanning the second document image which are longer than a predetermined threshold are determined as vertical temporary lines, and data defining positons and sizes of those lines are stored. A plurality of horizontal temporary lines which are adjacent to each other are consolidated into one solid line and defining data for the horizontal ruled lines are determined. Similarly, a plurality of vertical temporary lines are consolidated and defining data for the vertical ruled lines are determined.
REFERENCES:
patent: 4533959 (1985-08-01), Sakurai
patent: 4665555 (1987-05-01), Alker et al.
patent: 4933984 (1990-06-01), Nakano
M. Nagao, "Pattern Information Processing", edited by The Institute of Electronics and Communication Engineers of Japan and published by Corona Co. Ltd., pp. 84-85. (English translation unavailable to applicants' attorney).
Kawachiya Sachiko
Takeda Haruo
Boudreau Leo H.
Hitachi , Ltd.
Klocinski Steven P.
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