Nonliner calibration of output devices

Details Nonliner calibration of output devices Nonliner calibration of output devices

1997-05-02

1999-09-14

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

395102, 358298, 358429, 358455, 358456, 358534, G06F 1500, H04N 121, H04N 141, H04N 146

Patent

active

059534982

ABSTRACT:
A method for the nonlinear calibration of digital image data without the introduction of tonal loss is applied to image data in a computer-to-printing press system. Apparatus for implementing this method is provided. Computer processed graphics, provided from the computer in 8-bit format, are converted into 16-bit format. This 16-bit image data is then calibrated to compensate for anticipated press gain. The calibration translates the image data according to a desired nonlinear cutback (value reduction) curve of gray value reduction. Calibrated image data is then passed through 16-bit halftoning screening, the output from which is provided to the imagesetter. The implemention may include a general purpose computer with specific software resident therein, or dedicated hardware including a series of encoders and look-up table implementaion devices. Alternatively, or supplementally, the laser exposure in the image setter may be increased to contribute substitute or supplemental analog nonlinear gray value reduction.

REFERENCES:
patent: 5532849 (1996-07-01), McIntyre et al.
patent: 5786843 (1998-07-01), Venkateswar
patent: 5818604 (1998-10-01), Delabastita et al.

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