B - Operations – Transporting – 41 – C
Patent
B - Operations, Transporting
41
C
342/5
B41C 1/04 (2006.01) B44B 3/00 (2006.01) H04N 1/40 (2006.01) H04N 1/409 (2006.01)
Patent
CA 1218733
ABSTRACT OF THE DISCLOSURE A method and associated apparatus is provided for con- verting halftone and screened films (12A and 12B) for use with electromechanical gravure engravers (22), comprising the steps of positioning an array (26) of photosensitive ele- ments adjacent at least one film (12A) having an image there- on in the form of transparent and opaque picture elements (pixels) (30 and 32) having predetermined dimensions, affect- ing 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 photosensi- tive elements to a predetermined number of photosensitive elements to a predetermined width of pixels, effectively creating a first sample area (34) bounded by the predeter- mined 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 coin- cident 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 photosensi- tive elements of the second sample area (36) minus the count of the first sample area (34) to provide a signal represent- ing the percentage dot area (PDA) for use with an electro- mechanical gravure engraver (22).
455731
George Harvey F.
Toor Yair
Gravure Research Institute Inc.
Smart & Biggar
LandOfFree
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