Color image reading apparatus

Details Color image reading apparatus Color image reading apparatus

1995-01-11

2000-01-25

Vu, Kim Yen

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

358504, 358516, 358524, H04N 158

Patent

active

060185996

ABSTRACT:
When a color film original is read, a shading correction or the like is executed without using a color base film. An apparatus has: an RAM 115 in which output ratios of RGB signals from an RGB sensor (CCD) 106 for an unexposed portion of a color film have previously been stored; an amplifier 107 to amplify the signals from the CCD line sensor 106 by gains based on the RGB signal output ratios from the RAM 115 without transmitting through the base film when shading correction data is read; and a shading correction circuit 110 to give the shading correction data to an RAM 111 on the basis of outputs of the amplifier 107.

REFERENCES:
patent: 4853768 (1989-08-01), Suzuki et al.
patent: 4979027 (1990-12-01), Sakai
patent: 5032903 (1991-07-01), Suzuki et al.
patent: 5060061 (1991-10-01), Shisido et al.
patent: 5185658 (1993-02-01), Itagaki et al.
patent: 5237401 (1993-08-01), Koike et al.
patent: 5414535 (1995-05-01), Kanmoto et al.

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