Method of gray scaling facsimile images

Details Method of gray scaling facsimile images Method of gray scaling facsimile images

1994-03-04

1995-06-20

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358429, 358401, H04N 140

Patent

active

054265142

ABSTRACT:
A system and method for creating data values suitable for producing a gray scaled approximation of a facsimile image on a lower resolution display. Facsimile image data is compressed based upon horizontal and vertical scaling factors that depend upon the number and organization of display screen pixels to be used to produce the gray scaled image verses the number and organization of pixels in the facsimile image. A conversion vector having entries in a one-to-one relationship with the display pixels of a display scan line is formed. Numerical values are then added to or subtracted from the conversion vector entries associated with the beginning and ending of the black runs of the facsimile image, as determined by using the horizontal scaling factor. The numerical values themselves depend upon how much of the conversion vector entry is spanned by the scaled black facsimile image run length. The contents of the conversion vector are then used to determine final intensity values suitable for controlling the intensity of individual pixels of a display scan line. Several facsimile image scan lines may be used to produce numerical values in the conversion vector, thus a display scan line may be formed by a plurality of facsimile image scan lines. Data for additional display scan lines may then be produced by resetting the conversion vector entries to zero and gray scaling additional facsimile image scan lines.

REFERENCES:
patent: 4673977 (1987-06-01), Stelzenmuller
patent: 4870498 (1989-09-01), Schoon
patent: 5067023 (1991-11-01), Kim
patent: 5113455 (1992-05-01), Scott

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