Method of and apparatus for generating correction table for imag

Details Method of and apparatus for generating correction table for imag Method of and apparatus for generating correction table for imag

1993-12-07

1997-12-16

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358534, G06F 1500

Patent

active

056994907

ABSTRACT:
To produce a correction table to be referred to when a quantum level data (QL data) as an input image data to a given image output device is converted into an image having a halftone dot percentage, reference QL data having a plurality of data values arranged at predetermined data intervals are inputted to the image output device; the halftone dot percentage of an output image from the image output device are measured; an approximation formula of a desired function form is determined to approximate the measured halftone dot percentage by the method of least squares, on the condition that the formula should go through preset starting and ending points; and the correction table is produced based on the resulted approximation formula.

REFERENCES:
patent: 4841362 (1989-06-01), Urabe et al.
patent: 5103298 (1992-04-01), Kashimura et al.
patent: 5175621 (1992-12-01), Maesato
patent: 5309526 (1994-05-01), Pappas et al.
patent: 5311332 (1994-05-01), Imao et al.
patent: 5373567 (1994-12-01), Tauahashi et al.

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