Image reading device and method

Details Image reading device and method Image reading device and method

1998-05-22

2000-07-04

Johns, Andrew W.

Image analysis

Color image processing

Color correction

358516, 358518, 358461, 348223, 348251, 348655, G06K 900

Patent

active

060849835

ABSTRACT:
The image reading device has a white level correction coefficient calculation processor, in which a white level correction coefficient, used when performing a shading correction, is calculated for each pixel data outputted from a line sensor. An exposure measurement is performed so that a color correction coefficient is calculated. A combined correction coefficient, i.e. a product of the white level correction coefficient and the color correction coefficient is obtained, and a pre-scanning operation is performed to obtain pixel data. The pixel data is multiplied by the combined correction coefficient, so that the shading correction and the color correction are performed simultaneously as a combined correction.

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patent: 5732165 (1998-03-01), Suzuki et al.
patent: 5748307 (1998-05-01), Nakamura et al.
patent: 5917556 (1999-06-01), Katayama

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