Halftone dot image recording apparatus and method employing high

Details Halftone dot image recording apparatus and method employing high Halftone dot image recording apparatus and method employing high

1988-02-25

1990-03-27

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358298, 358456, H04N 140

Patent

active

049125680

ABSTRACT:
Apparatus is provided for recording halftone dot images on a photosensitive material by emitting a light beam which is modulated in accordance with digital image data. In a screen pattern memory (23), screen pattern data provided with a value for each element area which is smaller than a light spot diameter of a light beam on a surface of a photosensitive material is stored. The level of a screen pattern signal obtained from the screen pattern data and that of an image signal obtained from digital image data are compared in a comparator (22). An intensity of the light beam is modulated according to a result of comparison in the comparator (22). Because the screen pattern signal is given as a high density signal, the light beam is modulated in each element area which is smaller than a light spot diameter.

REFERENCES:
patent: 4450485 (1984-05-01), Oshikoshi et al.
patent: 4780768 (1988-10-01), Tomohisa et al.

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