Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1984-10-31
1986-09-16
Goldberg, E. A.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358283, 358284, 358294, H04N 140, H04N 121, H04N 123, H04N 1024
Patent
active
046125841
ABSTRACT:
A method and associated apparatus is provided for converting halftone and screened films (12A and 12B) for use with electromechanical gravure engravers (22), comprising the steps of positioning an array (26) of photosensitive elements adjacent at least one film (12A) having an image thereon in the form of transparent and opaque picture elements (pixels) (30 and 32) having predetermined dimensions, affecting relative movement between the array (26) and the film (12A) for sampling a plurality of pixels of the film by the array (26), assigning a predetermined number of photosensitive elements to a predetermined number of photosensitive elements to a predetermined width of pixels, effectively creating a first sample area (34) bounded by the predetermined width of pixels and a pre-established number of samples, effectively creating a second sample area (36) smaller than the first sample area (34) and bounded by a plurality of pixels, the center of the second sample area (36) being coincident with that of the first sample area (34), counting the photosensitive elements which provide signals indicating transparent pixel areas within the first sample area (34), counting the photosensitive elements which provide signals indicating transparent pixel areas within the second sample area (36), adding the count of the photosensitive elements of the second sample area (36) to the count of the photosensitive elements of the second sample area (36) minus the count of the first sample area (34) to provide a signal representing the percentage dot area (PDA) for use with an electromechanical gravure engraver (22).
REFERENCES:
patent: 2892887 (1959-06-01), Hell
patent: 4288821 (1981-09-01), Lavallee et al.
patent: 4482923 (1984-11-01), Fisher et al.
patent: 4484232 (1984-11-01), Gast
patent: 4509195 (1985-04-01), Nadler
George Harvey F.
Toor Yair
Foster Patrick W.
Goldberg E. A.
Gravure Research Institute, Inc.
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