Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1994-02-28
1995-10-03
Chan, Wing F.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358488, H04N 140, H04N 104
Patent
active
054556902
ABSTRACT:
An image reading apparatus for photoelectrically reading an image (e.g. as used in facsimile apparatus, digital copying machines, etc.) includes a reference member provided at a reading position within the image reading apparatus; a reading device for reading, at the reading position, an image of at least one of (i) an original document and (ii) the reference member, and for generating image data representative of the read image; a memory unit for previously storing as reference data, data obtained by reading the reference member with the reading device; a correcting device for correcting image data obtained by reading an original document with the reading device; using the reference data stored in the memory unit; a discriminating device for discriminating whether the original document is present at the reading position by comparing position data, obtained by reading the image at the reading position, with the reference data stored in the memory unit; and a control unit for controlling the memory unit to store the position data to replace the reference data, when the discriminating device discriminates that the original document is not present at the reading position.
REFERENCES:
patent: 4717963 (1988-01-01), Koizumi
patent: 4760464 (1988-07-01), Sakano
patent: 4870501 (1989-09-01), Yoshida
patent: 4907097 (1990-03-01), Sobue
patent: 5124810 (1992-06-01), Seto
Canon Kabushiki Kaisha
Chan Wing F.
Lee Ping W.
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