Dither matrix design using sub-pixel addressability

Details Dither matrix design using sub-pixel addressability Dither matrix design using sub-pixel addressability

2008-04-29

2008-04-29

Poon, King Y. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S001900

Reexamination Certificate

active

10754175

ABSTRACT:
A method of generating a dither matrix for an output device having sub-pixel addressability that permits the attenuation of tone for less than whole pixels. An original representative pixel grid is expanded to a super-resolution by replication of the pixel grid in both directions by the sub-pixel factor S. Halftoning methods for generating dither patterns are then applied using the super-resolution grid to create dither or filter outputs, which are converted to a corresponding output for a sub-pixel resolution grid. Selection of location for incremental addition (deletion) of tone is made using the sub-pixel grid output. The cycle of output generation, conversion to sub-pixel resolution, and tone modulation selection is repeated iteratively until a desired gray level is reached. The process is further repeated for each desired gray level to produce the multiple dither patterns that comprise the desired dither matrix.

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