Image processing system, image processing apparatus, image...

Details Image processing system, image processing apparatus, image... Image processing system, image processing apparatus, image...

2006-02-14

2006-02-14

Williams, Kimberly (Department: 2626)

Facsimile and static presentation processing

Natural color facsimile

Color correction

C358S519000, C358S518000, C358S505000, C358S509000

Reexamination Certificate

active

06999213

ABSTRACT:
A construction is achieved at low cost which reduces the loss of gradation in a dark portion of an image that has been subjected to gamma correction in accordance with characteristics of a display. In an image reading apparatus, to make it possible to more finely reproduce the gradation in the dark portion, the number of gradations expressed by an signal obtained by a CCD is reduced by performing non-linear gamma correction using a gamma coefficient below one, and the resulting signal is transferred to a computer serving as a host computer. In the computer, the transferred signal is subjected to gamma correction using a gamma coefficient that is an inverse of the gamma coefficient used in the image reading apparatus, thereby canceling out the influence of the gamma correction performed in the image reading apparatus.

REFERENCES:
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patent: 6183933 (2001-02-01), Ishikawa et al.
patent: 6538771 (2003-03-01), Sakatani et al.
patent: 6819439 (2004-11-01), Hayashi et al.

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