Image reading apparatus capable of eliminating moire pattern

Details Image reading apparatus capable of eliminating moire pattern Image reading apparatus capable of eliminating moire pattern

1988-08-25

1990-07-03

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358454, H04N 1393

Patent

active

049395904

ABSTRACT:
When an original formed by using a dot screen is read, a key which corresponds to the screen line number of the dot screen is inputted. By the key input, a suitable magnification rate data based on the screen line number is set for eliminating moire patterns. An optical enlarging magnification rate and reducing magnification rate are determined based on the set magnification rate data. The image of the original is projected on an image sensor at this optical enlarging magnification rate and is converted into electrical data. The electrical data are reduced electrically at the reducing magnification rate to be outputted as the image data.

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patent: 4862285 (1989-08-01), Miyakawa

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