Improved method and apparatus for generating halftone images

Details Improved method and apparatus for generating halftone images Improved method and apparatus for generating halftone images

1989-09-19

1991-01-15

Reynolds, Bruce A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358456, H04N 123, H04N 140, H04N 1411

Patent

active

049857797

ABSTRACT:
An improved method and apparatus for generating halftone images using a beam of variable intensity. A look-up table that is accessed, at a minimum, by position coordinates and image intensity data provides beam intensity information. In certain embodiments, the look-up table may be accessed by dot set identification data and/or randomly generated numbers in addition to the position coordinates and the image intensity data. The position coordinates (x,y) may be generated by performing a coordinate transformation on the beam position coordinates (u,v). The beam intensity data stored in the look-up table may permit the formation of soft dots, i.e. halftone dots that are formed by different levels of beam exposure. The look-up table also permits an increase in dot frequency in the middle tones.

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