Apparatus and method for generating half-tone dot in image repro

Details Apparatus and method for generating half-tone dot in image repro Apparatus and method for generating half-tone dot in image repro

1994-07-18

1997-03-04

Mancuso, Joseph

Image analysis

Image enhancement or restoration

Variable threshold, gain, or slice level

358457, 358466, 358535, G06K 938

Patent

active

056088221

ABSTRACT:
This invention discloses an improved method and apparatus for generating a screened reproduction of an image. The apparatus comprises a matrix defining an arrangement of a plurality of areas within a printing dot, each having an assigned reference value. The screening logic apparatus receives input density information with respect to an image and includes apparatus for assigning to each input density a corresponding plurality of reference values. The apparatus also includes a method for combining with each of the plurality of reference values a random additional reference value, thereby defining a randomized plurality of reference values. The apparatus also causes the exposure of those areas in the matrix having reference values which correspond to the randomized plurality of reference values.

REFERENCES:
patent: 4340912 (1982-07-01), Troxel
patent: 4456924 (1984-06-01), Rosenfeld
patent: 4825298 (1989-04-01), Ikuta et al.
patent: 4918622 (1990-04-01), Granger et al.

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