White level setting system for an image scanner

Details White level setting system for an image scanner White level setting system for an image scanner

1995-06-05

1997-04-29

Mancuso, Joseph

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

382319, 358406, G06K 936

Patent

active

056257180

ABSTRACT:
The present invention provides a white level setting system for an image scanner. The system compares an analog image signal obtained by scanning an original or a white reference with a predetermined analog white level signal, to provide a digital image signal corresponding to an image on the original, calculates a white level for the next scan line according to the digital image signal, and employs the white level for the next scan line.

REFERENCES:
patent: 4709274 (1987-11-01), Tanioka
patent: 5065257 (1991-11-01), Yamada
patent: 5151796 (1992-09-01), Ito et al.
patent: 5237172 (1993-08-01), Lehman et al.
patent: 5267053 (1993-11-01), Potucek et al.
patent: 5331428 (1994-07-01), Uffel

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