Image processing apparatus and method

Details Image processing apparatus and method Image processing apparatus and method

1996-02-29

1999-06-01

Grant, II, Jerome

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358448, H04N 140

Patent

active

059092874

ABSTRACT:
A document serving as a white reference (a reference white background) is read to create shading data, the shading data are stored, the checksum of these shading data is obtained and this value also is stored. The checksum of the stored shading data is obtained before the document is read, and this obtained value of the checksum is compared with the already stored value of the checksum of the shading data. If the values of both checksums are found to coincide as a result of the comparison, image processing using the stored shading data is executed. If the values of both checksums do not coincide, however, image processing using shading data having a fixed value is executed.

REFERENCES:
patent: 4594733 (1986-06-01), Kanzaki et al.
patent: 5208873 (1993-05-01), Nakajima

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