Method and apparatus for establishing threshold level in a binar

Details Method and apparatus for establishing threshold level in a binar Method and apparatus for establishing threshold level in a binar

1992-02-12

1993-04-06

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358466, G06K 938

Patent

active

052010147

ABSTRACT:
In a document scanner that is operating in the binary mode, the magnitude of the signal that is generated for each picture element (PEL) of each document scan line is compared to the magnitude of a threshold signal. Either a binary 0 or a binary 1 is generated as a result of this comparison. The threshold signal magnitude is dynamically established by a method and an apparatus that provides a stored history or histogram of the various signal magnitudes that are generated for each PEL of a plurality of the document scan lines. Since the signal magnitude(s) that is provided by scanning the background, non-image, area of the document occurs the majority of the time within this histogram, the magnitude of this majority signal(s) is used to set the threshold signal magnitude. As a result, the PELS of the document's visible image are converted to a binary electronic image with a minimum loss of visual image content. The threshold signal magnitude is continuously established in this manner during the scanning of a document.

REFERENCES:
patent: 4468703 (1984-08-01), Fujiwara et al.
patent: 4656665 (1987-04-01), Pennebaker
patent: 4710822 (1987-12-01), Matsunawa
patent: 4847912 (1989-07-01), Tanaka et al.
patent: 4907286 (1990-03-01), Yamada
patent: 4977605 (1990-12-01), Fardeau et al.
patent: 5025480 (1991-06-01), Morton et al.

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