Scan image target locator system for calibrating a printing syst

Details Scan image target locator system for calibrating a printing syst Scan image target locator system for calibrating a printing syst

1994-12-01

1997-06-24

Wong, Peter S.

Facsimile and static presentation processing

Facsimile

Facsimile measuring, testing, or calibrating

358296, 382312, H04N 1401

Patent

active

056422024

ABSTRACT:
A system and method for calibrating a printing system includes a printer and a master test image document printed by the printer. The master test image has three locator symbols and a plurality of test objects, each symbol having a distinct apex. The apexes are non-colinear. A memory prestores image data corresponding to the test objects printed on the master test image document and positional data corresponding to a desired coordinate value for each non-colinear apex. The system also includes a scanner for scanning the master test image document and detects the locator symbols printed on master test image document to generate transition data therefrom. The calibration process determines a coordinate value for each non-colinear apex based on the transition data and generates a transformation matrix based on a difference between the determined coordinate value for each non-colinear apex and the desired coordinate value for each non-colinear apex. A compensation process retrieves prestored image data corresponding to the scanned image data based on the transformation matrix. The calibration process then compares scanned image data with the retrieved prestored image data to generate compensation values based on a difference between the scanned image data and the prestored image data.

REFERENCES:
patent: 5198907 (1993-03-01), Walker et al.
patent: 5287162 (1994-02-01), De Jong et al.
patent: 5452112 (1995-09-01), Wan et al.
patent: 5510896 (1996-04-01), Wafler

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