Method for automatic recognition of white blocks as well as text

Details Method for automatic recognition of white blocks as well as text Method for automatic recognition of white blocks as well as text

1982-04-02

1985-03-05

Martin, John C.

Image analysis

Histogram processing

For setting a threshold

382 48, 358282, 358260, G06K 934, H04N 140

Patent

active

045035563

ABSTRACT:
A method for automatic recognition of white blocks as well as text, graphics and/or gray image areas on a printed master employs the steps of optoelectronically scanning the master and converting the analog scanning signals into digital signals such that a binarily encoded representation of the master is generated. Horizontal and vertical white blocks are successively searched for in the binary image and the locations of such white blocks are stored. The binary image thus subdivided by horizontal white blocks and the binary image subdivided by vertical white blocks are logically linked to one another in order to locate white "frames" for the individual areas of the printed matter. Such printed master areas formed in white are subsequently statistically analyzed in order to determine whether the framed area represents a text, graphics or gray image area on the printed master.

REFERENCES:
patent: 3496543 (1970-02-01), Greenly
patent: 3805237 (1974-04-01), Cobb et al.
patent: 4411015 (1983-10-01), Scherl et al.
"Procedures for an Automatic Segmentation of Text, Graphics and Half Tone Regions in Documents", by Oja et al.
Proceedings of the Second Scandinavian Conference on Image Analysis, 6/17/81, pp. 177-182.

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