Method and apparatus for exposure calibration in recording devic

Details Method and apparatus for exposure calibration in recording devic Method and apparatus for exposure calibration in recording devic

1993-02-18

1995-12-05

Powell, Mark R.

H04N 123

Patent

active

054737346

ABSTRACT:
A method and apparatus for exposure calibration of a recording device for pixel-by-pixel and line-by-line exposure of rastered areas on a recording material. A correction function (transfer function) is calculated, and picture signal values that are to be recorded, and which represent nominal gray scale values, are corrected according to the correction function so that the real gray scale values that are recorded correspond to the nominal gray scale values. For calculating the transfer function, check rasters having line patterns are exposed pixel-by-pixel and line-by-line on the recording material and the surface coverage values of the developed check rasters are measured. Relative increases in the optical density of the check raster are calculated from the measured surface coverage values. The effective increase in optical density of a dot or picture element is calculated from the relative increases in optical density of the check raster, taking the raster parameters provided for the recording into consideration. Subsequently, an increase in the optical density function is calculated for the nominal gray scale values of the gray scale range and the transfer function is calculated from the increase in the optical density function.

REFERENCES:
patent: 3657472 (1972-04-01), Taudt et al.
patent: 4206475 (1980-06-01), Taudt et al.
patent: 4482252 (1984-11-01), Lorenz
patent: 4814791 (1989-03-01), Ohara et al.
patent: 4846577 (1989-07-01), Grindon
patent: 4956703 (1990-09-01), Uzuda et al.
patent: 5157482 (1992-09-01), Cosgrove
patent: 5170257 (1992-12-01), Burns
patent: 5172224 (1992-12-01), Collette et al.
patent: 5204761 (1993-04-01), Gusmano
patent: 5245443 (1993-09-01), Burns
patent: 5249242 (1993-09-01), Hanson et al.
patent: 5257097 (1993-10-01), Pineau et al.
patent: 5313283 (1994-05-01), Rice et al.
Linotype Series 2000/Graphics 2000 User Manual. Mar. 1989.
Calibration Utility for Linotype Imagesetter Version 1.0, 1989.
Linotype Company--Calibration Utility--Product Information, 1990.
Linotype--"Scanned Color", Section 2.1 Calibration, 1990.

Affiliated with

Also associated with

Rating

Method and apparatus for exposure calibration in recording devic does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for exposure calibration in recording devic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for exposure calibration in recording devic will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1380773