Shading correction system for image scanning apparatus

Details Shading correction system for image scanning apparatus Shading correction system for image scanning apparatus

1987-06-26

1988-07-26

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358284, 382 53, H04N 140

Patent

active

047604646

ABSTRACT:
A shading correction system is used in an image scanning apparatus which stores shading data which are obtained by scanning a white substrate and carries out a shading correction on the image information which is obtained by scanning an intended image by use of the stored shading data. The white substrate is scanned a plurality of times at different locations thereof and previous shading data stored in a memory are compared with present shading data so as to renew the contents of the memory depending on the compared result. The renewal of the contents of the memory is carried out in N stages, where each of the N stages carry out the comparing and renewing operation for one of N different groups of scans over the white substrate for one of N different picture element groups each comprising 1/N a total number of picture elements in each scan.

REFERENCES:
patent: 4578711 (1986-03-01), White et al.
patent: 4601058 (1986-07-01), Seto
patent: 4691239 (1987-09-01), Nelson
patent: 4691240 (1987-09-01), Kurusu et al.

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