Method and apparatus for forming 3.times.3 pixel arrays and for

Details Method and apparatus for forming 3.times.3 pixel arrays and for Method and apparatus for forming 3.times.3 pixel arrays and for

1985-03-18

1987-03-03

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358263, 382 56, G06K 900

Patent

active

046481192

ABSTRACT:
Apparatus for defining a bank of sequential windows from a raster-scanned image of a document for storage in a data base. In addition, the apparatus includes a look-up table for each window wherein the bit pattern of the window is used to determine the correction factor which is applied to the next window as the "new" bit from a set of patterns and correction factors derived from well known algorithms developed to minimize the amount of data needed to electronically recreate a given document. The apparatus also includes storage devices to permit the application of the algorithm in overlapping pieces over the face of the document.

REFERENCES:
patent: 4298858 (1981-11-01), Romanski
patent: 4301443 (1981-11-01), Sternberg et al.
patent: 4354243 (1982-10-01), Ryan et al.
patent: 4365304 (1982-12-01), Ruhman et al.
patent: 4369430 (1983-01-01), Sternberg
patent: 4566039 (1986-01-01), Oya
patent: 4574394 (1986-03-01), Holsztynski et al.

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