Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Reexamination Certificate
2005-09-30
2011-11-08
Pathak, Sudhanshu (Department: 2625)
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
C358S498000, C358S496000, C358S482000, C382S274000
Reexamination Certificate
active
08054510
ABSTRACT:
A document reader comprises line sensors that are staggeredly arranged and read a white reference plate to obtain a white reference read value A, and a white reference average value AA is determined from value A for each line sensor. The line sensors read another white reference plate placed on a document support plate to obtain a white reference read value B, and a white reference read average value BB is determined from value B for each line sensor. A sensitivity effect coefficient C for each line sensor is determined by dividing BB by AA. Using the line sensors, there are obtained a document read value E for each line sensor by reading an illuminated document on the document support plate, a white reference read value Aa by reading with the white reference plate before reading the document, and a black reference read value D by reading the white reference plate under a condition that an illumination is turned off before reading of the document. Shading for the line sensors is corrected using the coefficient C, the values Aa, D and E, and a number of gradation levels for image regions corresponding to read areas of the document.
REFERENCES:
patent: 4734787 (1988-03-01), Hayashi
patent: 5115327 (1992-05-01), Ishima
patent: 5214520 (1993-05-01), Miyazawa
patent: 5802217 (1998-09-01), Suzuki et al.
patent: 6356735 (2002-03-01), Hozumi
patent: 6563938 (2003-05-01), Harada
patent: 7102797 (2006-09-01), Sakai
patent: 2003/0142367 (2003-07-01), Ito
patent: 2003/0147111 (2003-08-01), Steinebach
patent: 2004/0223192 (2004-11-01), Hiromatsu et al.
patent: 2005/0134937 (2005-06-01), Cholewo et al.
patent: 0286414 (1988-10-01), None
patent: 64 19865 (1989-01-01), None
patent: 64019865 (1989-01-01), None
patent: 03096171 (1991-04-01), None
patent: 5122527 (1993-05-01), None
patent: 05122527 (1993-05-01), None
patent: 05207232 (1993-08-01), None
patent: 5207232 (1993-08-01), None
patent: 2001136346 (2001-05-01), None
patent: 2004214834 (2004-07-01), None
Suzuki Makoto
Yoshida Masaaki
Adams & Wilks
Chen Huo Long
Pathak Sudhanshu
Seiko I Infotech Inc.
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