Digital electronic system for halftone printing

Details Digital electronic system for halftone printing Digital electronic system for halftone printing

1990-12-31

1992-08-18

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358456, 358460, H04N 121, H04N 140

Patent

active

051404311

ABSTRACT:
A system for producing an image by halftone printing generates halftone dots from electronic data by scanning 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.

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patent: 4692879 (1987-09-01), Ikuta
patent: 4805033 (1989-02-01), Nishikawa
patent: 4969053 (1990-11-01), Outa et al.

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