Scan image processing

Details Scan image processing Scan image processing

1991-10-23

1994-01-25

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Facsimile measuring, testing, or calibrating

358461, H04H 100, H04N 514

Patent

active

052820530

ABSTRACT:
The method of scanning a document by providing a test patch to be scanned, initially scanning the test patch and storing the signal response of each reading element to the test patch in a pixel threshold table, providing a document to be scanned, scanning the document and comparing the signal response of each reading element with the corresponding signal response in the pixel threshold table, and printing a mark or not printing a mark in response to the comparison for each reading element. The method includes an extended threshold table to cover halftone cells.

REFERENCES:
patent: 4383275 (1983-05-01), Sasaki et al.
patent: 4520395 (1985-05-01), Abe
patent: 4602293 (1986-07-01), Sekine
patent: 4660082 (1987-04-01), Tomohisa et al.
patent: 4806780 (1989-02-01), Yamamoto et al.
patent: 4974098 (1990-11-01), Miyakawa et al.

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