H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 1/21 (2006.01) H04N 1/04 (2006.01) H04N 1/23 (2006.01) H04N 1/405 (2006.01)
Patent
CA 2058027
IM-0417 TITLE DIGITAL ELECTRONIC SYSTEM FOR HALFTONE PRINTING ABSTRACT OF THE DISCLOSURE A system for producing an image by halftone printing comprises generating halftone dots from electronic data by scanning across across a raster of write spots in a recording medium, spot-by-spot and line-by-line. Each dot is defined within a repetitive dot template containing a plurality of write spots. The system writes at selective write spots by sending a present write-spot address signal obtained from a write- spot address register to a spot-status Look-Up-Table for selecting a predetermined value for each write spot, the predetermined value determining an on-off status for the present write spot. The spot-status Look-Up-Table has a plurality of predetermined values corresponding, respectively, to addresses of write spots within the dot template. In the present invention, the selective writing step is performed by sending the write-spot address signal also to a pointer Look-Up Table for generating an address pointer signal uniquely associated with a particular write-spot address code, and transmitting the address pointer signal to the write- spot address register in order to obtain the next write- spot address signal.
Cardillo Louis A.
E. I. Du Pont de Nemours And Company
Sim & Mcburney
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