Interleaving vertical pixels in raster-based laser printers

Details Interleaving vertical pixels in raster-based laser printers Interleaving vertical pixels in raster-based laser printers

1990-11-07

1993-03-09

Grimley, A. T.

Facsimile and static presentation processing

Facsimile

Recording apparatus

346108, H04N 121

Patent

active

051930080

ABSTRACT:
The output of a conventional laser printer having a resolution of 300.times.300 dots per inch (DPI), and a predetermined threshold level for forming image dots, is enhanced by selectively providing interleaved image dots between the normal scan lines of the laser printer. Such interleaved image dots between scan lines may be achieved by appropriately energizing the two pixels directly above and directly below that desired interleaved dot, with the energizations at one or both pixels being selectively below the threshold level for producing a dot on the scan line, but with the combined energization at the desired interleaved point being above the threshold level to produce the desired interleaved dot. An input 600.times.600 bit map may be stored in a random access memory, and three vertically aligned bits from one main scan lne and adjacent 600 DPI lines above and below are drawn from the RAM and are supplied to a logic and video output circuit which produces variable pulse width modulated pulses to the laser printer to produce the enhanced image.

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