Image processing method and apparatus

Details Image processing method and apparatus Image processing method and apparatus

1995-08-15

1998-05-26

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

382274, H04N 140

Patent

active

057575150

ABSTRACT:
An image reading apparatus can perform shading correction with a simple arrangement. Prior to an original read operation, a prescanning operation is performed using a white reference original. Shading data is formed by a shading correction circuit and held in both an internal shading memory and a memory in a shading data confirming unit. The shading data confirming unit compares the data in both the memories to detect whether the data is destroyed. If the data is destroyed, permanent shading data is used. When the image is a halftone image, the prescanning operation is performed again to form shading data. Therefore, a conventionally used prescanning mechanism for the reference white ground can be omitted. At the same time, even when the shading data is destroyed by an abnormal voltage or the like, processing can be normally performed.

REFERENCES:
patent: 5062144 (1991-10-01), Murakami
patent: 5091789 (1992-02-01), Haneda et al.
patent: 5253083 (1993-10-01), Hirota
patent: 5325210 (1994-06-01), Takashima et al.
patent: 5398119 (1995-03-01), Suzuki
patent: 5455690 (1995-10-01), Ishikawa

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