Image processing apparatus and method, recording medium, and...

Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction

Reexamination Certificate

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C382S286000

Reexamination Certificate

active

07460728

ABSTRACT:
For each pixel read from an imaging device, a horizontal counter value and a vertical counter value corresponding to the pixel are supplied from a signal generator to a distance computation section via an optical-axis-center coordinate setting section and an up-and-down and right-and-left weighting section. In the distance computation section, the distance to the optical-axis center is computed, and correction coefficients for the zoom wide end and for the zoom tele end, which correspond to the distance, are obtained by look-up tables. The two obtained correction coefficients are blended at a mixture ratio determined by a blend ratio setting section. The blended shading correction coefficients are gain adjusted by a gain adjustment section, after which they are supplied to a correction section. As a result, a correction corresponding to the distance to the optical-axis-center position is performed on the signal of each pixel supplied from an imaging section.

REFERENCES:
patent: 6195469 (2001-02-01), Nishioka et al.
patent: 6707955 (2004-03-01), Shiomi
patent: 7075569 (2006-07-01), Niikawa
patent: 2002/0025164 (2002-02-01), Suzuki
patent: 2002/0094131 (2002-07-01), Shirakawa
patent: 2003/0156204 (2003-08-01), Sato et al.
Patent Abstracts of Japan, JP 9-307789, Nov. 28, 1997.

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