Document scanning apparatus having image signal correcting capab

Details Document scanning apparatus having image signal correcting capab Document scanning apparatus having image signal correcting capab

1991-05-30

1993-04-27

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358486, 358494, 358496, 358498, H04N 104

Patent

active

052067440

ABSTRACT:
A document scanning apparatus includes an image signal part for generating a number of successive image signals from a document which is transported along a transport path between a pair of feeding rollers and a pair of ejection rollers, a first detection part for detecting a position of the document in the transport path where a document transport is disordered when a front edge of the document being transported comes in contact with the ejection rollers, a second detection part for detecting a position of the document in the transport path where the document transport is disordered when a rear edge of the document being transported separates from the feeding rollers, and a signal correction part for correcting a defective image signal when at least one of the first detection part and the second detection part detects the position of the document where the document transport is disordered, the defective image signal being corrected through a prescribed signal correction which is carried out for a number of image signals adjacent to the defective image signal which are received from the image signal part.

REFERENCES:
patent: 4742559 (1988-05-01), Fujiwara et al.

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