Method of and apparatus for recording halftone image

Details Method of and apparatus for recording halftone image Method of and apparatus for recording halftone image

1989-04-14

1991-10-08

Orsino, Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, 358458, 358465, 358466, H04N 140

Patent

active

050559435

ABSTRACT:
An image scanner for producing a halftone image is provided with a halftone signal generator which generates an exposure signal (S) for controlling the exposure duration of a laser beam (L) which beam is focused on a photosensitive material. The halftone signal generator is so constructed that image data (N) is compared with a threshold data (screen pattern data) for each elementary area and the exposure duration for each elementary area is determined mainly according to a difference between the image data and the threshold data. Some of the elementary areas are partially exposed, to an extent which depends on the exposure duration.

REFERENCES:
patent: 3197558 (1965-07-01), Ernst
patent: 4644392 (1987-02-01), Yamada
patent: 4701811 (1987-10-01), Moriguchi et al.
patent: 4814886 (1989-03-01), Kuge et al.
patent: 4876611 (1989-10-01), Fischer et al.
Optical Scanning of Continuous-Tone and Line Documents with Spatial Frequency Separation with Improved Data Handling & Compaction, Schinder et al., vol. 20, No. 12, 5-78.

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