Apparatus and method for scaling facsimile image data

Details Apparatus and method for scaling facsimile image data Apparatus and method for scaling facsimile image data

1982-09-30

1985-07-09

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

340731, 340793, 358140, 358287, 382 56, G06K 942

Patent

active

045286930

ABSTRACT:
Apparatus and method for converting image data of an image matrix to an image matrix having a different number of matrix points. Each new image pel has a gray scale determined by considering its position with respect to the nearest neighbors of an original image pel. A look up table is provided having a plurality of planes, each plane including a plurality of storage elements arranged in columns and rows. The storage elements contain the gray scale level of a new image pel. The look up table plane represents the gray scale levels for a plurality of positions within the neighborhood. The planes are addressed by the gray scale levels of the pels comprising the neighborhood, and the storage elements within a plane are addressed by the position of the new pel with respect to the neighbors.

REFERENCES:
patent: 3976982 (1976-08-01), Eiselen
patent: 4090188 (1978-05-01), Suga
patent: 4124871 (1978-11-01), Morrin
patent: 4193092 (1978-06-01), Stoffel
patent: 4381547 (1983-04-01), Ejiri

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