Method of obtaining white reference data used for correcting non

Details Method of obtaining white reference data used for correcting non Method of obtaining white reference data used for correcting non

1989-04-06

1991-10-29

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358461, 358464, G06K 900

Patent

active

050621440

ABSTRACT:
In an image scan reader, a white reference plate is attached to a transparent plate on which an original is to be placed. Different regions are defined on the reference plate and respective optical densities on a plurality of scanning lines (L.sub.Al -L.sub.An, L.sub.Bl -L.sub.Bm) are detected and averaged within each region (R.sub.A, R.sub.B). The maximum averaged densities are selected for each given pixel position to be used for correcting the non-uniformity of CCD cells which are employed in reading the white reference plate and the image of the original.

REFERENCES:
patent: 4523229 (1985-06-01), Kanmoto
patent: 4550435 (1985-10-01), Hayman
patent: 4760464 (1988-07-01), Sakano
patent: 4829379 (1987-03-01), Takaki
patent: 4903145 (1987-08-01), Funada
patent: 4916549 (1988-06-01), Sekizawa
patent: 4972502 (1990-11-01), Katsuta et al.

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