Method of an apparatus for outputting halftone dot image

Details Method of an apparatus for outputting halftone dot image Method of an apparatus for outputting halftone dot image

1996-10-22

1998-03-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358298, 358459, H04N 140

Patent

active

057318840

ABSTRACT:
An halftone dot image output apparatus scans a photosensitive medium with a laser beam which is selectively turned on and off based on an indicated halftone dot area percentage that is inputted, for thereby recording the halftone dot image on the photosensitive medium, and develops the recorded halftone dot image to output a film with the halftone dot image recorded thereon. The halftone dot image output apparatus has a halftone gradation calibrator for calibrating a gradation of the halftone dot image in order to equalize the indicated halftone dot area percentage with an output halftone dot area percentage on the film depending on output conditions including a screen ruling, a test pattern generating and outputting unit for outputting a test halftone dot image to a film prior to outputting a new halftone dot image on the film, a measuring unit for measuring a halftone dot area percentage of the test halftone dot image on the film, a laser power calculator and a laser power setting unit for resetting an amount of exposure to the laser beam based on the measured halftone dot area percentage in order to equalize the indicated halftone dot area percentage with the output halftone dot area percentage for recalibration.

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