Detecting the alignment of a document in an automatic...

Details Detecting the alignment of a document in an automatic... Detecting the alignment of a document in an automatic...

2001-11-09

2008-11-25

Lee, Cheukfan (Department: 2625)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C358S496000, C358S488000, C358S486000

Reexamination Certificate

active

07457012

ABSTRACT:
A method of detecting the alignment of a document in an automatic document feeder including an optical scanner that has an automatic document feeder and a document. The automatic document feeder has a colored pattern layer corresponding to a scanning window of the optical scanner. The document has at least one side edge. When the document is being fed into the automatic document feeder, the side edge is just positioned between the scanning window and the colored pattern layer. When the automatic document feeder is switched on to feed in the document, a first image retrieval is made from the document placed on the scanning window. After the document is fed in by an appropriate length, a second image retrieval is made from the document placed on the scanning window. A slant value is calculated.

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