Automated image calibration

Details Automated image calibration Automated image calibration

1991-06-12

1993-02-09

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 80, 358406, 358455, 358463, 358464, 395109, H04N 123, H04N 146

Patent

active

051856735

ABSTRACT:
A document processing system (DPS) having a closed feedback loop for improving the quality of the printed form of images that have been scanned into the DPS by scanners. The DPS includes a print path. The closed feedback loop automatically calibrates the print path such that printed documents have a true representation of the scanned image. The closed feedback loop operates as follows. First, a calibration image for the print path is created. Then, the calibration image is processed in the DPS. Then, distortions in the calibration image, caused by the processing, are measured. Then, calibration coefficients for offsetting the distortions are calculated. Finally, the image of the original document is precompensated by modifying the image according to the calibration coefficients.

REFERENCES:
patent: 4710785 (1987-12-01), Mills
patent: 5107332 (1992-04-01), Chan

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