Optical scanner threshold setting method and sheet

Details Optical scanner threshold setting method and sheet Optical scanner threshold setting method and sheet

1990-11-20

1993-03-16

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Facsimile measuring, testing, or calibrating

358408, 358465, 358466, 358486, 358488, H04N 100

Patent

active

051949660

ABSTRACT:
A method for the optimization of optical scanners by automatically determining image processing threshold values using a novel threshold calibration sheet. The calibration sheet image has lines at a forty-five degree angle to the path of the document through the scanner and has a predetermined image dot count. One embodiment comprises the steps of repetitively scanning the sheet until scanner threshold values which satisfy predetermined relationships with said dot count are determined. Another embodiment comprises the steps of a single calibration scan with multiple processing of the gray scale scan data on a host computer. By using this method, two or more scanner cameras can work together on processing document images and consistently give uniform results, independent of their individual technical operating or performance differences.

REFERENCES:
patent: 3675201 (1972-07-01), McKissick et al.
patent: 4408231 (1983-10-01), Bushaw et al.
patent: 4575581 (1986-03-01), Langberg
patent: 4605970 (1986-08-01), Hawkins
patent: 4974098 (1990-11-01), Miyakawa et al.

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